{"id":51,"date":"2023-12-23T11:36:53","date_gmt":"2023-08-13T07:21:21","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%a6%82%e4%bd%95%e5%9c%a8mysql%e4%b8%ad%e4%bd%bf%e7%94%a8%e8%a7%a6%e5%8f%91%e5%99%a8\/"},"modified":"2025-07-31T22:05:26","modified_gmt":"2025-07-31T14:05:26","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8mysql%e4%b8%ad%e4%bd%bf%e7%94%a8%e8%a7%a6%e5%8f%91%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%a6%82%e4%bd%95%e5%9c%a8mysql%e4%b8%ad%e4%bd%bf%e7%94%a8%e8%a7%a6%e5%8f%91%e5%99%a8\/","title":{"rendered":"MySQL\u89e6\u53d1\u5668\u7ec8\u6781\u6307\u5357\uff1a\u4ece\u5165\u95e8\u5230\u7cbe\u901a"},"content":{"rendered":"<h3>\u5f15\u8a00<\/h3>\n<p>\u5728\u5904\u7406\u5173\u7cfb\u578b\u6570\u636e\u5e93\u548c\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff08SQL\uff09\u65f6\uff0c\u5927\u591a\u6570\u6570\u636e\u64cd\u4f5c\u662f\u901a\u8fc7\u663e\u5f0f\u6267\u884c\u7684\u67e5\u8be2\u64cd\u4f5c\u6765\u5b9e\u73b0\u7684\uff0c\u4f8b\u5982<code>SELECT<\/code>\u3001<code>INSERT<\/code>\u6216<code>UPDATE<\/code>\u3002<\/p>\n<p>\u7136\u800c\uff0cSQL\u6570\u636e\u5e93\u8fd8\u53ef\u4ee5\u901a\u8fc7<strong>\u89e6\u53d1\u5668\uff08Triggers\uff09<\/strong>\u81ea\u52a8\u6267\u884c\u9884\u5b9a\u4e49\u7684\u64cd\u4f5c\uff0c\u6bcf\u5f53\u53d1\u751f\u7279\u5b9a\u4e8b\u4ef6\u65f6\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u89e6\u53d1\u5668\u4fdd\u7559\u6240\u6709<code>DELETE<\/code>\u8bed\u53e5\u7684\u5ba1\u8ba1\u65e5\u5fd7\uff0c\u6216\u8005\u5728\u6bcf\u6b21\u66f4\u65b0\u6216\u8ffd\u52a0\u884c\u5230\u8868\u65f6\u81ea\u52a8\u66f4\u65b0\u805a\u5408\u7edf\u8ba1\u6458\u8981\u3002<\/p>\n<p>\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u60a8\u5c06\u4f7f\u7528\u4e0d\u540c\u7684SQL\u89e6\u53d1\u5668\u6765\u81ea\u52a8\u6267\u884c\u5728\u884c\u63d2\u5165\u3001\u66f4\u65b0\u6216\u5220\u9664\u65f6\u8fdb\u884c\u7684\u64cd\u4f5c\u3002<\/p>\n<h2>\u5148\u51b3\u6761\u4ef6<\/h2>\n<p>\u8981\u6309\u7167\u672c\u6307\u5357\u64cd\u4f5c\uff0c\u60a8\u9700\u8981\u4e00\u53f0\u8fd0\u884c\u57fa\u4e8eSQL\u7684\u5173\u7cfb\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff08RDBMS\uff09\u7684\u8ba1\u7b97\u673a\u3002\u672c\u6307\u5357\u4e2d\u7684\u6307\u4ee4\u548c\u793a\u4f8b\u662f\u5728\u4ee5\u4e0b\u73af\u5883\u4e0b\u9a8c\u8bc1\u7684\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u4e00\u53f0\u8fd0\u884c Ubuntu 20.04 \u7684\u670d\u52a1\u5668\uff0c\u62e5\u6709\u5177\u5907\u7ba1\u7406\u6743\u9650\u7684\u975eroot\u7528\u6237\uff0c\u5e76\u914d\u7f6e\u4e86UFW\u9632\u706b\u5899\uff0c\u5177\u4f53\u8bf7\u53c2\u8003\u6211\u4eec\u7684 <a href=\"#\">Ubuntu 20.04 \u670d\u52a1\u5668\u521d\u59cb\u8bbe\u7f6e\u6307\u5357<\/a>\u3002<\/li>\n<li>\u5728\u670d\u52a1\u5668\u4e0a\u5b89\u88c5\u5e76\u914d\u7f6e\u4e86MySQL\uff0c\u5177\u4f53\u8bf7\u53c2\u8003 <a href=\"#\">\u5982\u4f55\u5728 Ubuntu 20.04 \u4e0a\u5b89\u88c5 MySQL<\/a>\u3002\u672c\u6307\u5357\u5df2\u901a\u8fc7\u4f7f\u7528\u5728\u7b2c3\u6b65\u4e2d\u521b\u5efa\u7684\u975eroot MySQL\u7528\u6237\u8fdb\u884c\u9a8c\u8bc1\u3002<\/li>\n<li>\u5bf9\u6267\u884c <code>SELECT<\/code>\u3001<code>INSERT<\/code>\u3001<code>UPDATE<\/code> \u548c <code>DELETE<\/code> \u67e5\u8be2\u4ee5\u64cd\u4f5c\u6570\u636e\u5e93\u6709\u57fa\u672c\u7684\u4e86\u89e3\uff0c\u5177\u4f53\u8bf7\u53c2\u8003\u6211\u4eec\u7684 <a href=\"#\">\u5982\u4f55\u5728 SQL \u4e2d\u4ece\u8868\u4e2d\u9009\u62e9\u884c<\/a>\u3001<a href=\"#\">\u5982\u4f55\u5728 SQL \u4e2d\u63d2\u5165\u6570\u636e<\/a>\u3001<a href=\"#\">\u5982\u4f55\u5728 SQL \u4e2d\u66f4\u65b0\u6570\u636e<\/a> \u548c <a href=\"#\">\u5982\u4f55\u5728 SQL \u4e2d\u5220\u9664\u6570\u636e<\/a> \u6307\u5357\u3002<\/li>\n<li>\u5bf9\u4f7f\u7528\u5d4c\u5957\u67e5\u8be2\u6709\u57fa\u672c\u7684\u4e86\u89e3\uff0c\u5177\u4f53\u8bf7\u53c2\u8003\u6211\u4eec\u7684 <a href=\"#\">\u5982\u4f55\u5728 SQL \u4e2d\u4f7f\u7528\u5d4c\u5957\u67e5\u8be2<\/a> \u6307\u5357\u3002<\/li>\n<li>\u5bf9\u4f7f\u7528\u805a\u5408\u6570\u5b66\u51fd\u6570\u6709\u57fa\u672c\u7684\u4e86\u89e3\uff0c\u5177\u4f53\u8bf7\u53c2\u8003\u6211\u4eec\u7684 <a href=\"#\">\u5982\u4f55\u5728 SQL \u4e2d\u4f7f\u7528\u6570\u5b66\u8868\u8fbe\u5f0f\u548c\u805a\u5408\u51fd\u6570<\/a> \u6307\u5357\u3002<\/li>\n<\/ul>\n<div class=\"post-conf-note\">\n<p class=\"post-conf-desc\"><strong>\u6ce8\u610f\uff1a<\/strong>\u8bb8\u591a\u5173\u7cfb\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u4f7f\u7528\u81ea\u5df1\u7684SQL\u5b9e\u73b0\u3002\u5c3d\u7ba1\u89e6\u53d1\u5668\u88ab\u63d0\u53ca\u4e3aSQL\u6807\u51c6\u7684\u4e00\u90e8\u5206\uff0c\u4f46\u6807\u51c6\u5e76\u672a\u5f3a\u5236\u89c4\u5b9a\u5176\u8bed\u6cd5\u6216\u5177\u4f53\u7684\u5b9e\u73b0\u65b9\u5f0f\u3002\u56e0\u6b64\uff0c\u5b83\u4eec\u5728\u4e0d\u540c\u6570\u636e\u5e93\u4e2d\u7684\u5b9e\u73b0\u65b9\u5f0f\u4e0d\u540c\u3002\u672c\u6559\u7a0b\u4e2d\u6982\u8ff0\u7684\u547d\u4ee4\u4f7f\u7528MySQL\u6570\u636e\u5e93\u7684\u8bed\u6cd5\uff0c\u53ef\u80fd\u65e0\u6cd5\u5728\u5176\u4ed6\u6570\u636e\u5e93\u5f15\u64ce\u4e0a\u6b63\u5e38\u5de5\u4f5c\u3002\u60a8\u8fd8\u9700\u8981\u4e00\u4e2a\u5e26\u6709\u4e00\u4e9b\u5df2\u52a0\u8f7d\u6837\u672c\u6570\u636e\u7684\u6570\u636e\u5e93\uff0c\u4ee5\u4fbf\u60a8\u53ef\u4ee5\u7ec3\u4e60\u4f7f\u7528\u51fd\u6570\u3002\u6211\u4eec\u9f13\u52b1\u60a8\u9605\u8bfb\u4ee5\u4e0b\u201c\u8fde\u63a5\u5230MySQL\u5e76\u8bbe\u7f6e\u6837\u672c\u6570\u636e\u5e93\u201d\u90e8\u5206\uff0c\u4e86\u89e3\u8fde\u63a5\u5230MySQL\u670d\u52a1\u5668\u4ee5\u53ca\u5728\u672c\u6307\u5357\u4e2d\u4f7f\u7528\u7684\u6d4b\u8bd5\u6570\u636e\u5e93\u7684\u521b\u5efa\u8be6\u60c5\u3002<\/p>\n<\/div>\n<h2>\u8fde\u63a5\u5230MySQL\u5e76\u8bbe\u7f6e\u4e00\u4e2a\u6837\u672c\u6570\u636e\u5e93<\/h2>\n<p>\u5728\u672c\u8282\u4e2d\uff0c\u60a8\u5c06\u8fde\u63a5\u5230\u4e00\u4e2aMySQL\u670d\u52a1\u5668\u5e76\u521b\u5efa\u4e00\u4e2a\u793a\u4f8b\u6570\u636e\u5e93\uff0c\u4ee5\u4fbf\u60a8\u53ef\u4ee5\u5728\u63a5\u4e0b\u6765\u7684\u51e0\u8282\u4e2d\u8ddf\u968f\u793a\u4f8b\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<p>\u5bf9\u4e8e\u672c\u6307\u5357\uff0c\u60a8\u5c06\u4f7f\u7528\u4e00\u4e2a\u5047\u60f3\u7684\u6536\u85cf\u54c1\u96c6\u5408\u3002\u60a8\u5c06\u5b58\u50a8\u5173\u4e8e\u5f53\u524d\u62e5\u6709\u7684\u6536\u85cf\u54c1\u7684\u8be6\u7ec6\u4fe1\u606f\uff0c\u968f\u65f6\u4fdd\u6301\u5b83\u4eec\u7684\u603b\u4ef7\u503c\u53ef\u7528\uff0c\u5e76\u786e\u4fdd\u5220\u9664\u4e00\u4e2a\u6536\u85cf\u54c1\u59cb\u7ec8\u7559\u4e0b\u75d5\u8ff9\u3002<\/p>\n<p>\u5982\u679c\u60a8\u7684SQL\u6570\u636e\u5e93\u7cfb\u7edf\u5728\u8fdc\u7a0b\u670d\u52a1\u5668\u4e0a\u8fd0\u884c\uff0c\u8bf7\u4ece\u60a8\u7684\u672c\u5730\u673a\u5668\u4e0a\u7684SSH\u767b\u5f55\u5230\u670d\u52a1\u5668\u3002<\/p>\n<pre class=\"post-pre\"><code class=\"language-bash\"><span class=\"token function\">ssh<\/span> <mark>sammy<\/mark>@<mark>your_server_ip<\/mark><\/code><\/pre>\n<p>\u7136\u540e\u6253\u5f00MySQL\u670d\u52a1\u5668\u63d0\u793a\u7b26\uff0c\u5c06\u201csammy\u201d\u66ff\u6362\u4e3a\u60a8\u7684MySQL\u7528\u6237\u5e10\u6237\u7684\u540d\u79f0\u3002<\/p>\n<pre class=\"post-pre\"><code class=\"language-bash\">mysql <span class=\"token parameter variable\">-u<\/span> <mark>sammy<\/mark> <span class=\"token parameter variable\">-p<\/span><\/code><\/pre>\n<p>\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a<code>collectibles<\/code>\u7684\u6570\u636e\u5e93\u3002<\/p>\n<pre class=\"post-pre\"><code class=\"language-sql\">CREATE DATABASE collectibles;<\/code><\/pre>\n<p>\u5982\u679c\u6570\u636e\u5e93\u521b\u5efa\u6210\u529f\uff0c\u60a8\u5c06\u6536\u5230\u5982\u4e0b\u8f93\u51fa\uff1a<\/p>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code class=\"language-text\">Query OK, 1 row affected (0.01 sec)<\/code><\/pre>\n<p>\u8981\u9009\u62e9<code>collectibles<\/code>\u6570\u636e\u5e93\uff0c\u8bf7\u8fd0\u884c\u4ee5\u4e0b<code>USE<\/code>\u8bed\u53e5\uff1a<\/p>\n<pre class=\"post-pre\"><code class=\"language-sql\">USE collectibles;<\/code><\/pre>\n<p>\u60a8\u5c06\u4f1a\u5f97\u5230\u4ee5\u4e0b\u7684\u8f93\u51fa\uff1a<\/p>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code class=\"language-text\">Database changed<\/code><\/pre>\n<p>\u5728\u9009\u62e9\u6570\u636e\u5e93\u4e4b\u540e\uff0c\u60a8\u53ef\u4ee5\u5728\u5176\u4e2d\u521b\u5efa\u793a\u4f8b\u8868\u3002\u8868<code>collectibles<\/code>\u5c06\u5305\u542b\u6709\u5173\u6570\u636e\u5e93\u4e2d\u6536\u85cf\u54c1\u7684\u7b80\u5316\u6570\u636e\u3002\u5b83\u5c06\u5305\u542b\u4ee5\u4e0b\u5217\uff1a<\/p>\n<ul class=\"post-ul\">\n<li><code>name<\/code>: \u6b64\u5217\u5b58\u50a8\u6bcf\u4e2a\u6536\u85cf\u54c1\u7684\u540d\u79f0\uff0c\u4f7f\u7528<code>varchar<\/code>\u6570\u636e\u7c7b\u578b\uff0c\u6700\u5927\u957f\u5ea6\u4e3a50\u4e2a\u5b57\u7b26\u3002<\/li>\n<li><code>value<\/code>: \u6b64\u5217\u5b58\u50a8\u6536\u85cf\u54c1\u7684\u5e02\u573a\u4ef7\u503c\uff0c\u4f7f\u7528<code>decimal<\/code>\u6570\u636e\u7c7b\u578b\uff0c\u5c0f\u6570\u70b9\u524d\u6700\u591a5\u4f4d\uff0c\u5c0f\u6570\u70b9\u540e2\u4f4d\u3002<\/li>\n<\/ul>\n<p>\u7528\u4ee5\u4e0b\u547d\u4ee4\u521b\u5efa\u793a\u4f8b\u8868\uff1a<\/p>\n<pre class=\"post-pre\"><code class=\"language-sql\">CREATE TABLE collectibles (\r\nname varchar(50),\r\nvalue decimal(5, 2)\r\n);<\/code><\/pre>\n<p>\u5982\u679c\u4e0b\u9762\u7684\u8f93\u51fa\u6253\u5370\u51fa\u6765\uff0c\u90a3\u4e48\u8868\u5df2\u7ecf\u88ab\u521b\u5efa\u4e86\u3002<\/p>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528\u89e6\u53d1\u5668\u300b\u7684\u7b2c2\u90e8\u5206\uff08\u51719\u90e8\u5206\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code>Query OK, 0 rows affected (0.00 sec)<\/code><\/pre>\n<p>\u4e0b\u4e00\u4e2a\u8868\u5c06\u547d\u540d\u4e3a<code>collectibles_stats<\/code>\uff0c\u5b83\u5c06\u7528\u4e8e\u8ddf\u8e2a\u6536\u85cf\u54c1\u96c6\u5408\u4e2d\u6240\u6709\u6536\u85cf\u54c1\u7684\u7d2f\u8ba1\u4ef7\u503c\u3002\u8be5\u8868\u5c06\u5305\u542b\u4e00\u884c\u6570\u636e\uff0c\u5177\u6709\u4ee5\u4e0b\u5217\uff1a<\/p>\n<ul class=\"post-ul\">\n<li><strong>count<\/strong>: \u6b64\u5217\u5b58\u50a8\u5df2\u62e5\u6709\u6536\u85cf\u54c1\u7684\u6570\u91cf\uff0c\u4f7f\u7528<code>INT<\/code>\u6570\u636e\u7c7b\u578b\u8868\u793a\u3002<\/li>\n<li><strong>value<\/strong>: \u6b64\u5217\u5b58\u50a8\u6240\u6709\u6536\u85cf\u54c1\u7684\u7d2f\u8ba1\u4ef7\u503c\uff0c\u4f7f\u7528<code>DECIMAL<\/code>\u6570\u636e\u7c7b\u578b\uff0c\u5c0f\u6570\u70b9\u524d\u6700\u591a5\u4f4d\uff0c\u5c0f\u6570\u70b9\u540e2\u4f4d\u3002<\/li>\n<\/ul>\n<p>\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u521b\u5efa\u793a\u4f8b\u8868\uff1a<\/p>\n<pre class=\"post-pre\"><code class=\"language-mysql\">CREATE TABLE collectibles_stats (\r\n  count INT,\r\n  value DECIMAL(5, 2)\r\n);<\/code><\/pre>\n<p>\u5982\u679c\u51fa\u73b0\u4ee5\u4e0b\u8f93\u51fa\uff0c\u5219\u8868\u793a\u8868\u5df2\u6210\u529f\u521b\u5efa\u3002<\/p>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>Query OK, 0 rows affected (0.00 sec)<\/code><\/pre>\n<p>\u7b2c\u4e09\u4e2a\u4e5f\u662f\u6700\u540e\u4e00\u4e2a\u8868\u5c06\u547d\u540d\u4e3a<code>collectibles_archive<\/code>\uff0c\u5b83\u5c06\u8ddf\u8e2a\u6240\u6709\u4ece\u6536\u85cf\u4e2d\u79fb\u9664\u7684\u85cf\u54c1\uff0c\u4ee5\u786e\u4fdd\u5b83\u4eec\u6c38\u8fdc\u4e0d\u4f1a\u4e22\u5931\u3002\u5b83\u5c06\u4fdd\u5b58\u4e0e<code>collectibles<\/code>\u8868\u7c7b\u4f3c\u7684\u6570\u636e\uff0c\u4f46\u589e\u52a0\u4e86\u79fb\u9664\u65e5\u671f\u3002\u5b83\u4f7f\u7528\u4ee5\u4e0b\u5217\uff1a<\/p>\n<ul class=\"post-ul\">\n<li><strong>name<\/strong>: \u6b64\u5217\u5b58\u50a8\u6bcf\u4e2a\u5df2\u79fb\u9664\u6536\u85cf\u54c1\u7684\u540d\u79f0\uff0c\u4f7f\u7528<code>VARCHAR<\/code>\u6570\u636e\u7c7b\u578b\uff0c\u6700\u5927\u957f\u5ea6\u4e3a50\u4e2a\u5b57\u7b26\u3002<\/li>\n<li><strong>value<\/strong>: \u6b64\u5217\u5b58\u50a8\u5220\u9664\u65f6\u6536\u85cf\u54c1\u7684\u5e02\u573a\u4ef7\u503c\uff0c\u4f7f\u7528<code>DECIMAL<\/code>\u6570\u636e\u7c7b\u578b\uff0c\u5c0f\u6570\u70b9\u524d\u6700\u591a5\u4f4d\uff0c\u5c0f\u6570\u70b9\u540e2\u4f4d\u3002<\/li>\n<li><strong>removed_on<\/strong>: \u6b64\u5217\u5b58\u50a8\u6bcf\u4e2a\u5df2\u5f52\u6863\u6536\u85cf\u54c1\u7684\u5220\u9664\u65e5\u671f\u548c\u65f6\u95f4\uff0c\u4f7f\u7528<code>TIMESTAMP<\/code>\u6570\u636e\u7c7b\u578b\uff0c\u9ed8\u8ba4\u503c\u4e3a<code>NOW()<\/code>\uff0c\u8868\u793a\u5f53\u65b0\u884c\u63d2\u5165\u6b64\u8868\u65f6\u7684\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\u3002<\/li>\n<\/ul>\n<p>\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u521b\u5efa\u793a\u4f8b\u8868\uff1a<\/p>\n<pre class=\"post-pre\"><code class=\"language-mysql\">CREATE TABLE collectibles_archive (\r\n  name VARCHAR(50),\r\n  value DECIMAL(5, 2),\r\n  removed_on TIMESTAMP DEFAULT CURRENT_TIMESTAMP\r\n);<\/code><\/pre>\n<p>\u5982\u679c\u6253\u5370\u51fa\u4ee5\u4e0b\u8f93\u51fa\uff0c\u8bf4\u660e\u8868\u5df2\u521b\u5efa\uff1a<\/p>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>Query OK, 0 rows affected (0.00 sec)<\/code><\/pre>\n<p>\u968f\u540e\uff0c\u901a\u8fc7\u8fd0\u884c\u4ee5\u4e0b<code>INSERT INTO<\/code>\u64cd\u4f5c\uff0c\u5c06<code>collectibles_stats<\/code>\u8868\u52a0\u8f7d\u5230\u7a7a<code>collectibles<\/code>\u96c6\u5408\u7684\u521d\u59cb\u72b6\u6001\u3002<\/p>\n<pre class=\"post-pre\"><code class=\"language-mysql\">INSERT INTO collectibles_stats SELECT COUNT(name), SUM(value) FROM collectibles;<\/code><\/pre>\n<p>\u4f7f\u7528<code>INSERT INTO<\/code>\u64cd\u4f5c\u5c06\u5411<code>collectibles_stats<\/code>\u6dfb\u52a0\u4e00\u884c\uff0c\u5176\u4e2d\u7684\u503c\u662f\u4f7f\u7528\u805a\u5408\u51fd\u6570\u8ba1\u7b97\u5f97\u51fa\u7684\uff0c\u4ee5\u5bf9<code>collectibles<\/code>\u8868\u4e2d\u7684\u6240\u6709\u884c\u8fdb\u884c\u8ba1\u6570\uff0c\u5e76\u4f7f\u7528<code>value<\/code>\u5217\u548c<code>SUM<\/code>\u51fd\u6570\u8ba1\u7b97\u6240\u6709\u6536\u85cf\u54c1\u7684\u603b\u4ef7\u503c\u3002\u4e0b\u9762\u7684\u8f93\u51fa\u8868\u660e\u5df2\u6dfb\u52a0\u4e86\u4e00\u884c\u3002<\/p>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>Query OK, 1 row affected (0.002 sec) Records: 1 Duplicates: 0 Warnings: 0<\/code><\/pre>\n<p>\u4f60\u53ef\u4ee5\u901a\u8fc7\u5728\u8868\u4e0a\u6267\u884c<code>SELECT<\/code>\u8bed\u53e5\u6765\u9a8c\u8bc1\u8fd9\u4e00\u70b9\u3002<\/p>\n<pre class=\"post-pre\"><code class=\"language-mysql\">SELECT * FROM collectibles_stats;<\/code><\/pre>\n<p>\u7531\u4e8e\u6570\u636e\u5e93\u4e2d\u5c1a\u65e0\u53ef\u6536\u96c6\u7684\u7269\u54c1\uff0c\u56e0\u6b64\u521d\u59cb\u7269\u54c1\u6570\u91cf\u4e3a0\uff0c\u7d2f\u8ba1\u4ef7\u503c\u4e3a<code>NULL<\/code>\u3002<\/p>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>+-------+-------+\r\n| count | value |\r\n+-------+-------+\r\n|     0 |  NULL |\r\n+-------+-------+\r\n1 row in set (0.000 sec)<\/code><\/pre>\n<p>\u6709\u4e86\u8fd9\u4e9b\uff0c\u4f60\u5c31\u53ef\u4ee5\u7ee7\u7eed\u9605\u8bfb\u672c\u6307\u5357\u5e76\u5f00\u59cb\u5728MySQL\u4e2d\u4f7f\u7528\u89e6\u53d1\u5668\u4e86\u3002<\/p>\n<h2>\u7406\u89e3\u89e6\u53d1\u5668<\/h2>\n<h3>\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528\u89e6\u53d1\u5668\uff08\u7b2c3\u90e8\u5206\uff0c\u51719\u90e8\u5206\uff09<\/h3>\n<p>\u89e6\u53d1\u5668\u662f\u9488\u5bf9\u7279\u5b9a\u8868\u5b9a\u4e49\u7684\u8bed\u53e5\uff0c\u5f53\u8868\u4e2d\u53d1\u751f\u6307\u5b9a\u4e8b\u4ef6\u65f6\uff0c\u7531\u6570\u636e\u5e93\u81ea\u52a8\u6267\u884c\u3002\u89e6\u53d1\u5668\u53ef\u7528\u4e8e\u786e\u4fdd\u6bcf\u6b21\u5728\u7279\u5b9a\u8868\u4e0a\u6267\u884c\u67d0\u4e2a\u8bed\u53e5\u65f6\uff0c\u4e00\u4e9b\u64cd\u4f5c\u5c06\u59cb\u7ec8\u88ab\u6267\u884c\uff0c\u800c\u65e0\u9700\u6570\u636e\u5e93\u7528\u6237\u624b\u52a8\u5e72\u9884\u3002<\/p>\n<p>\u6bcf\u4e2a\u4e0e\u8868\u5173\u8054\u7684\u89e6\u53d1\u5668\u90fd\u6709\u4e00\u4e2a\u7528\u6237\u5b9a\u4e49\u7684\u540d\u79f0\u548c\u4e00\u5bf9\u6761\u4ef6\uff0c\u8fd9\u4e9b\u6761\u4ef6\u6307\u793a\u6570\u636e\u5e93\u5f15\u64ce\u4f55\u65f6\u6267\u884c\u89e6\u53d1\u5668\u3002\u8fd9\u4e9b\u6761\u4ef6\u53ef\u4ee5\u5206\u4e3a\u4e24\u4e2a\u4e0d\u540c\u7684\u7c7b\u522b\uff1a<\/p>\n<ul class=\"post-ul\">\n<li><strong>\u6570\u636e\u5e93\u4e8b\u4ef6\uff08Database event\uff09\uff1a<\/strong> \u89e6\u53d1\u5668\u53ef\u4ee5\u5728\u5bf9\u8868\u6267\u884c<code>INSERT<\/code>\u3001<code>UPDATE<\/code>\u6216<code>DELETE<\/code>\u8bed\u53e5\u65f6\u88ab\u6267\u884c\u3002<\/li>\n<li><strong>\u4e8b\u4ef6\u65f6\u95f4\uff08Event time\uff09\uff1a<\/strong> \u6b64\u5916\uff0c\u89e6\u53d1\u5668\u53ef\u4ee5\u5728\u76f8\u5173\u8bed\u53e5\u6267\u884c<strong>\u4e4b\u524d\uff08BEFORE\uff09<\/strong>\u6216<strong>\u4e4b\u540e\uff08AFTER\uff09<\/strong>\u6267\u884c\u3002<\/li>\n<\/ul>\n<p>\u5c06\u8fd9\u4e24\u4e2a\u6761\u4ef6\u7ec4\u5408\u5728\u4e00\u8d77\uff0c\u603b\u5171\u6709\u516d\u79cd\u4e0d\u540c\u7684\u89e6\u53d1\u53ef\u80fd\u6027\uff0c\u6bcf\u6b21\u6ee1\u8db3\u8054\u5408\u6761\u4ef6\u65f6\u90fd\u4f1a\u81ea\u52a8\u6267\u884c\u3002\u5728\u6267\u884c\u6ee1\u8db3\u6761\u4ef6\u7684\u8bed\u53e5\u4e4b\u524d\uff0c\u89e6\u53d1\u5668\u7684\u987a\u5e8f\u662f<code>BEFORE INSERT<\/code>\u3001<code>BEFORE UPDATE<\/code>\u548c<code>BEFORE DELETE<\/code>\u3002\u53ef\u4ee5\u5229\u7528\u8fd9\u4e9b\u89e6\u53d1\u5668\u5728\u6570\u636e\u88ab\u63d2\u5165\u6216\u66f4\u65b0\u5230\u8868\u4e2d\u4e4b\u524d\u5bf9\u5176\u8fdb\u884c\u64cd\u4f5c\u548c\u9a8c\u8bc1\uff0c\u6216\u8005\u5c06\u5220\u9664\u884c\u7684\u8be6\u60c5\u4fdd\u5b58\u7528\u4e8e\u5ba1\u8ba1\u6216\u5f52\u6863\u76ee\u7684\u3002<\/p>\n<p>\u5f53\u6ee1\u8db3\u6761\u4ef6\u7684\u8bed\u53e5\u88ab\u6267\u884c\u540e\u89e6\u53d1\u7684\u64cd\u4f5c\u6709<code>AFTER INSERT<\/code>\u3001<code>AFTER UPDATE<\/code>\u548c<code>AFTER DELETE<\/code>\u3002\u8fd9\u4e9b\u64cd\u4f5c\u53ef\u4ee5\u6839\u636e\u8bed\u53e5\u6267\u884c\u540e\u6570\u636e\u5e93\u7684\u6700\u7ec8\u72b6\u6001\uff0c\u5728\u53e6\u4e00\u4e2a\u8868\u4e2d\u66f4\u65b0\u6c47\u603b\u503c\u3002<\/p>\n<p>\u4e3a\u4e86\u6267\u884c\u8bf8\u5982\u9a8c\u8bc1\u548c\u64cd\u4f5c\u8f93\u5165\u6570\u636e\u6216\u5f52\u6863\u88ab\u5220\u9664\u7684\u884c\u7b49\u64cd\u4f5c\uff0c\u6570\u636e\u5e93\u5141\u8bb8\u5728\u89e6\u53d1\u5668\u5185\u8bbf\u95ee\u6570\u636e\u503c\u3002\u5bf9\u4e8e<code>INSERT<\/code>\u89e6\u53d1\u5668\uff0c\u53ea\u80fd\u4f7f\u7528\u65b0\u63d2\u5165\u7684\u6570\u636e\u3002\u5bf9\u4e8e<code>UPDATE<\/code>\u89e6\u53d1\u5668\uff0c\u53ef\u4ee5\u8bbf\u95ee\u539f\u59cb\u6570\u636e\u548c\u66f4\u65b0\u540e\u7684\u6570\u636e\u3002\u6700\u540e\uff0c\u5bf9\u4e8e<code>DELETE<\/code>\u89e6\u53d1\u5668\uff0c\u53ea\u80fd\u4f7f\u7528\u539f\u59cb\u884c\u6570\u636e\uff08\u56e0\u4e3a\u6ca1\u6709\u65b0\u6570\u636e\u53ef\u53c2\u8003\uff09\u3002<\/p>\n<p>\u89e6\u53d1\u5668\u4f53\u5185\u53ef\u4f7f\u7528\u7684\u6570\u636e\u662f\u901a\u8fc7\u6570\u636e\u5e93\u4e2d\u5f53\u524d\u7684<code>OLD<\/code>\u8bb0\u5f55\u548c\u67e5\u8be2\u5c06\u8981\u4fdd\u5b58\u7684<code>NEW<\/code>\u8bb0\u5f55\u516c\u5f00\u7684\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528<code>OLD.column_name<\/code>\u548c<code>NEW.column_name<\/code>\u7684\u8bed\u6cd5\u6765\u5f15\u7528\u5355\u4e2a\u5217\u3002<\/p>\n<p>\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86\u7528\u4e8e\u521b\u5efa\u65b0\u89e6\u53d1\u5668\u7684SQL\u8bed\u53e5\u7684\u4e00\u822c\u8bed\u6cd5\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">CREATE TRIGGER <mark>trigger_name<\/mark> <mark>trigger_condition<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\">ON <mark>table_name<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\">FOR EACH ROW<\/li>\n<li data-prefix=\"mysql&gt;\"><mark>trigger_actions<\/mark>;<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u5c06\u8bed\u6cd5\u5206\u89e3\u6210\u66f4\u5c0f\u7684\u90e8\u5206\uff1a<\/p>\n<ul class=\"post-ul\">\n<li><strong><code>CREATE TRIGGER<\/code><\/strong> \u662f\u7528\u4e8e\u5728\u6570\u636e\u5e93\u4e2d\u521b\u5efa\u65b0\u89e6\u53d1\u5668\u7684SQL\u8bed\u53e5\u540d\u79f0\u3002<\/li>\n<li><strong><code>trigger_name<\/code><\/strong> \u662f\u89e6\u53d1\u5668\u7684\u7528\u6237\u5b9a\u4e49\u540d\u79f0\uff0c\u7528\u4e8e\u63cf\u8ff0\u5176\u4f5c\u7528\uff0c\u7c7b\u4f3c\u4e8e\u8868\u540d\u548c\u5217\u540d\u7528\u4e8e\u63cf\u8ff0\u5176\u542b\u4e49\u7684\u65b9\u5f0f\u3002<\/li>\n<li><strong><code>ON table_name<\/code><\/strong> \u544a\u8bc9\u6570\u636e\u5e93\u8be5\u89e6\u53d1\u5668\u5e94\u76d1\u63a7\u5728<code>table_name<\/code>\u8868\u4e0a\u53d1\u751f\u7684\u4e8b\u4ef6\u3002<\/li>\n<li><strong><code>trigger_condition<\/code><\/strong> \u662f\u516d\u79cd\u53ef\u80fd\u7684\u9009\u62e9\u4e4b\u4e00\uff0c\u5b9a\u4e49\u4e86\u89e6\u53d1\u5668\u4f55\u65f6\u8fd0\u884c\uff0c\u4f8b\u5982 <code>BEFORE INSERT<\/code>\u3002<\/li>\n<li><strong><code>FOR EACH ROW<\/code><\/strong> \u544a\u8bc9\u6570\u636e\u5e93\u89e6\u53d1\u5668\u5e94\u9488\u5bf9\u53d7\u89e6\u53d1\u4e8b\u4ef6\u5f71\u54cd\u7684\u6bcf\u4e00\u884c\u8fd0\u884c\u3002\u4e00\u4e9b\u6570\u636e\u5e93\u652f\u6301\u9664<code>FOR EACH ROW<\/code>\u4e4b\u5916\u7684\u5176\u4ed6\u6267\u884c\u6a21\u5f0f\uff1b\u7136\u800c\uff0c\u5728MySQL\u4e2d\uff0c\u5bf9\u4e8e\u5bfc\u81f4\u89e6\u53d1\u5668\u6267\u884c\u7684\u8bed\u53e5\u6240\u5f71\u54cd\u7684\u6bcf\u4e00\u884c\u8fd0\u884c\u89e6\u53d1\u5668\u4f53\u4e2d\u7684\u8bed\u53e5\u662f\u552f\u4e00\u7684\u9009\u9879\u3002<\/li>\n<li><strong><code>trigger_actions<\/code><\/strong> \u662f\u89e6\u53d1\u5668\u7684\u4e3b\u4f53\uff0c\u5b9a\u4e49\u4e86\u89e6\u53d1\u5668\u6267\u884c\u65f6\u4f1a\u53d1\u751f\u4ec0\u4e48\u3002\u5b83\u901a\u5e38\u662f\u4e00\u4e2a\u6709\u6548\u7684SQL\u8bed\u53e5\u3002\u53ef\u4ee5\u4f7f\u7528<code>BEGIN<\/code>\u548c<code>END<\/code>\u5173\u952e\u5b57\u5c06\u8bed\u53e5\u5217\u8868\u5305\u542b\u5728\u4e00\u4e2a\u5757\u4e2d\uff0c\u4ece\u800c\u5728\u89e6\u53d1\u5668\u4e3b\u4f53\u4e2d\u5305\u542b\u591a\u4e2a\u8bed\u53e5\u4ee5\u6267\u884c\u590d\u6742\u7684\u6570\u636e\u64cd\u4f5c\u3002\u7136\u800c\uff0c\u8fd9\u8d85\u51fa\u4e86\u672c\u6559\u7a0b\u7684\u8303\u56f4\u3002\u8bf7\u67e5\u9605\u89e6\u53d1\u5668\u7684\u5b98\u65b9\u6587\u6863\u4ee5\u4e86\u89e3\u66f4\u591a\u5b9a\u4e49\u89e6\u53d1\u5668\u6240\u4f7f\u7528\u7684\u8bed\u6cd5\u3002<\/li>\n<\/ul>\n<p>\u5728\u63a5\u4e0b\u6765\u7684\u90e8\u5206\uff0c\u60a8\u5c06\u521b\u5efa\u5728\u8fdb\u884c<code>INSERT<\/code>\u548c<code>UPDATE<\/code>\u64cd\u4f5c\u4e4b\u524d\u64cd\u4f5c\u6570\u636e\u7684\u89e6\u53d1\u5668\u3002<\/p>\n<h2>\u4f7f\u7528<code>BEFORE INSERT<\/code>\u548c<code>BEFORE UPDATE<\/code>\u89e6\u53d1\u5668\u6765\u64cd\u4f5c\u6570\u636e<\/h2>\n<p>\u5728\u8fd9\u4e00\u8282\u4e2d\uff0c\u60a8\u5c06\u4f7f\u7528\u89e6\u53d1\u5668\u5728\u6267\u884c<code>INSERT<\/code>\u548c<code>UPDATE<\/code>\u8bed\u53e5\u4e4b\u524d\u5904\u7406\u6570\u636e\u3002<\/p>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u60a8\u5c06\u4f7f\u7528\u89e6\u53d1\u5668\u6765\u786e\u4fdd\u6570\u636e\u5e93\u4e2d\u7684\u6240\u6709\u53ef\u6536\u96c6\u9879\u90fd\u4f7f\u7528\u5927\u5199\u540d\u79f0\u4ee5\u4fdd\u6301\u4e00\u81f4\u3002\u5982\u679c\u4e0d\u4f7f\u7528\u89e6\u53d1\u5668\uff0c\u60a8\u5c06\u9700\u8981\u8bb0\u4f4f\u4e3a\u6bcf\u4e2a\u63d2\u5165\u548c\u66f4\u65b0\u8bed\u53e5\u4f7f\u7528\u5927\u5199\u7684\u53ef\u6536\u96c6\u9879\u540d\u79f0\u3002\u5982\u679c\u60a8\u5fd8\u8bb0\u4e86\uff0c\u6570\u636e\u5e93\u5c06\u4fdd\u5b58\u539f\u6837\u7684\u6570\u636e\uff0c\u53ef\u80fd\u5bfc\u81f4\u6570\u636e\u96c6\u4e2d\u7684\u9519\u8bef\u3002<\/p>\n<p>\u60a8\u5c06\u4ece\u63d2\u5165\u4e00\u4e2a\u540d\u4e3a\u201cspaceship model\u201d\u7684\u793a\u4f8b\u6536\u85cf\u54c1\u5f00\u59cb\uff0c\u4ef7\u503c12.50\u7f8e\u5143\u3002\u4e3a\u4e86\u8bf4\u660e\u95ee\u9898\uff0c\u9879\u76ee\u540d\u79f0\u5c06\u4ee5\u5c0f\u5199\u5b57\u6bcd\u4e66\u5199\u3002\u6267\u884c\u4ee5\u4e0b\u8bed\u53e5\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">INSERT INTO collectibles VALUES (&#8216;<mark>spaceship model<\/mark>&#8216;, 12.50);<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u4ee5\u4e0b\u4fe1\u606f\u786e\u8ba4\u7269\u54c1\u5df2\u7ecf\u88ab\u6dfb\u52a0\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/div>\n<pre class=\"post-pre\"><code>Query OK, 1 row affected (0.009 sec)<\/code><\/pre>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u901a\u8fc7\u6267\u884c<code>SELECT<\/code>\u67e5\u8be2\u60a8\u53ef\u4ee5\u9a8c\u8bc1\u8be5\u884c\u662f\u5426\u5df2\u63d2\u5165\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">SELECT * FROM collectibles;<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u4ee5\u4e0b\u7684\u8f93\u51fa\u5c06\u6253\u5370\u5230\u5c4f\u5e55\u4e0a\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/div>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528\u89e6\u53d1\u5668\u300b\u7684\u7b2c4\u90e8\u5206\uff08\u51719\u90e8\u5206\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<pre class=\"post-pre\"><code>+-----------------+-------+\r\n| name            | value |\r\n+-----------------+-------+\r\n| <mark>spaceship model<\/mark> | 12.50 |\r\n+-----------------+-------+\r\n1 row in set (0.000 sec)<\/code><\/pre>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u8fd9\u4e2a\u53ef\u6536\u85cf\u7269\u54c1\u7684\u540d\u79f0\u4ee5\u5c0f\u5199\u5b57\u6bcd\u4fdd\u5b58\u3002<\/p>\n<p>\u4e3a\u4e86\u786e\u4fdd\u6240\u6709\u672a\u6765\u7684\u53ef\u6536\u85cf\u54c1\u540d\u79f0\u90fd\u4ee5\u5927\u5199\u5b57\u6bcd\u5b58\u50a8\uff0c\u60a8\u5c06\u521b\u5efa\u4e00\u4e2a<code>BEFORE INSERT<\/code>\u89e6\u53d1\u5668\u3002\u5728\u89e6\u53d1\u8bed\u53e5\u8fd0\u884c\u4e4b\u524d\u6267\u884c\u7684\u89e6\u53d1\u5668\uff0c\u5141\u8bb8\u60a8\u5728\u6570\u636e\u4f20\u9012\u7ed9\u6570\u636e\u5e93\u4e4b\u524d\u5bf9\u5176\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<p>\u6267\u884c\u4ee5\u4e0b\u8bed\u53e5\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">CREATE TRIGGER <mark>uppercase_before_insert BEFORE INSERT<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\">ON collectibles<\/li>\n<li data-prefix=\"mysql&gt;\">FOR EACH ROW<\/li>\n<li data-prefix=\"mysql&gt;\"><mark>SET NEW.name = UPPER(NEW.name);<\/mark><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u8fd9\u4e2a\u547d\u4ee4\u521b\u5efa\u4e86\u4e00\u4e2a\u540d\u4e3a<code>uppercase_before_insert<\/code>\u7684\u89e6\u53d1\u5668\uff0c\u5b83\u4f1a\u5728<code>collectibles<\/code>\u8868\u4e0a\u7684\u6240\u6709<code>INSERT<\/code>\u8bed\u53e5\u6267\u884c\u4e4b\u524d\u88ab\u89e6\u53d1\u6267\u884c\u3002<\/p>\n<p>\u5bf9\u4e8e\u6bcf\u4e00\u884c\u63d2\u5165\u7684\u8bb0\u5f55\uff0c\u89e6\u53d1\u5668\u4e2d\u7684\u8bed\u53e5<code>SET NEW.name = UPPER(NEW.name)<\/code>\u5c06\u88ab\u6267\u884c\u3002<code>SET<\/code> SQL\u547d\u4ee4\u5c06\u53f3\u4fa7\u7684\u503c\u8d4b\u7ed9\u5de6\u4fa7\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c<code>NEW.name<\/code>\u8868\u793a\u63d2\u5165\u8bed\u53e5\u5c06\u4fdd\u5b58\u7684<code>name<\/code>\u5217\u7684\u503c\u3002\u901a\u8fc7\u5bf9\u53ef\u6536\u85cf\u54c1\u7684\u540d\u79f0\u5e94\u7528<code>UPPER<\/code>\u51fd\u6570\u5e76\u5c06\u5176\u91cd\u65b0\u8d4b\u503c\u7ed9\u5217\u503c\uff0c\u60a8\u5c06\u8f6c\u6362\u5c06\u4fdd\u5b58\u5728\u6570\u636e\u5e93\u4e2d\u7684\u503c\u7684\u5927\u5c0f\u5199\u3002<\/p>\n<div class=\"post-conf-warning\">\n<p class=\"post-conf-desc\"><strong>\u6ce8\u610f\uff1a<\/strong>\u5728\u8fd0\u884c<code>CREATE TRIGGER<\/code>\u547d\u4ee4\u65f6\uff0c\u60a8\u53ef\u80fd\u4f1a\u9047\u5230\u7c7b\u4f3c\u4e8e<code>ERROR 1419 (HY000)<\/code>\u7684\u9519\u8bef\u6d88\u606f\uff1a<code>\u60a8\u6ca1\u6709SUPER\u7279\u6743\uff0c\u5e76\u4e14\u542f\u7528\u4e86\u4e8c\u8fdb\u5236\u65e5\u5fd7\u8bb0\u5f55\uff08\u60a8*\u53ef\u80fd*\u60f3\u4f7f\u7528\u8f83\u4e0d\u5b89\u5168\u7684log_bin_trust_function_creators\u53d8\u91cf\uff09\u3002<\/code><\/p>\n<p>\u4eceMySQL 8\u5f00\u59cb\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u542f\u7528\u4e86MySQL\u6570\u636e\u5e93\u5f15\u64ce\u7684\u4e8c\u8fdb\u5236\u65e5\u5fd7\u8bb0\u5f55\uff0c\u9664\u975e\u672c\u5730\u5b89\u88c5\u914d\u7f6e\u8986\u76d6\u3002\u4e8c\u8fdb\u5236\u65e5\u5fd7\u4ee5\u4fdd\u5b58\u7684\u4e8b\u4ef6\u5f62\u5f0f\u8ffd\u8e2a\u4fee\u6539\u6570\u636e\u5e93\u5185\u5bb9\u7684\u6240\u6709SQL\u8bed\u53e5\u3002\u8fd9\u4e9b\u65e5\u5fd7\u7528\u4e8e\u6570\u636e\u5e93\u590d\u5236\uff0c\u4ee5\u4fdd\u6301\u6570\u636e\u5e93\u526f\u672c\u540c\u6b65\uff0c\u5e76\u7528\u4e8e\u65f6\u95f4\u70b9\u6570\u636e\u6062\u590d\u3002<\/p>\n<p>\u542f\u7528\u4e8c\u8fdb\u5236\u65e5\u5fd7\u8bb0\u5f55\u540e\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u5728\u590d\u5236\u73af\u5883\u4e2d\u7684\u6570\u636e\u5b89\u5168\u6027\u548c\u5b8c\u6574\u6027\uff0cMySQL\u7981\u6b62\u521b\u5efa\u89e6\u53d1\u5668\u548c\u5b58\u50a8\u8fc7\u7a0b\u3002\u4e86\u89e3\u89e6\u53d1\u5668\u548c\u5b58\u50a8\u8fc7\u7a0b\u5982\u4f55\u5f71\u54cd\u590d\u5236\u8d85\u51fa\u4e86\u672c\u6307\u5357\u7684\u8303\u56f4\u3002<\/p>\n<p>\u7136\u800c\uff0c\u5728\u672c\u5730\u73af\u5883\u548c\u5b66\u4e60\u76ee\u7684\u4e0b\uff0c\u60a8\u53ef\u4ee5\u5b89\u5168\u5730\u8986\u76d6MySQL\u9632\u6b62\u521b\u5efa\u89e6\u53d1\u5668\u7684\u65b9\u5f0f\u3002\u8986\u76d6\u7684\u8bbe\u7f6e\u4e0d\u4f1a\u88ab\u6301\u4e45\u4fdd\u5b58\uff0c\u5728MySQL\u670d\u52a1\u5668\u91cd\u65b0\u542f\u52a8\u65f6\u5c06\u8fd4\u56de\u5230\u539f\u59cb\u503c\u3002<\/p>\n<p>\u8981\u8986\u76d6\u4e8c\u8fdb\u5236\u65e5\u5fd7\u7684\u9ed8\u8ba4\u8bbe\u7f6e\uff0c\u8bf7\u4ee5<code>root<\/code>\u8eab\u4efd\u767b\u5f55MySQL\u5e76\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre class=\"post-pre\"><code>SET GLOBAL log_bin_trust_function_creators = 1;<\/code><\/pre>\n<p><code>log_bin_trust_function_creators<\/code>\u8bbe\u7f6e\u63a7\u5236\u521b\u5efa\u89e6\u53d1\u5668\u548c\u5b58\u50a8\u51fd\u6570\u7684\u7528\u6237\u662f\u5426\u53ef\u4fe1\uff0c\u4f7f\u5176\u4e0d\u4f1a\u521b\u5efa\u5bfc\u81f4\u4e0d\u5b89\u5168\u4e8b\u4ef6\u88ab\u5199\u5165\u4e8c\u8fdb\u5236\u65e5\u5fd7\u7684\u89e6\u53d1\u5668\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u8be5\u8bbe\u7f6e\u7684\u503c\u4e3a<code>0<\/code>\uff0c\u5728\u542f\u7528\u4e8c\u8fdb\u5236\u65e5\u5fd7\u8bb0\u5f55\u7684\u73af\u5883\u4e2d\uff0c\u53ea\u5141\u8bb8\u8d85\u7ea7\u7528\u6237\u521b\u5efa\u89e6\u53d1\u5668\u3002\u5c06\u503c\u66f4\u6539\u4e3a<code>1<\/code>\u540e\uff0c\u4efb\u4f55\u53d1\u51fa<code>CREATE TRIGGER<\/code>\u8bed\u53e5\u7684\u7528\u6237\u90fd\u88ab\u4fe1\u4efb\u80fd\u591f\u7406\u89e3\u5176\u5f71\u54cd\u3002<\/p>\n<p>\u66f4\u65b0\u8bbe\u7f6e\u540e\uff0c\u4ee5<code>root<\/code>\u8eab\u4efd\u9000\u51fa\u767b\u5f55\uff0c\u4ee5\u60a8\u7684\u7528\u6237\u8eab\u4efd\u91cd\u65b0\u767b\u5f55\uff0c\u5e76\u91cd\u65b0\u8fd0\u884c<code>CREATE TRIGGER<\/code>\u8bed\u53e5\u3002<\/p>\n<p>\u8981\u4e86\u89e3\u5173\u4e8eMySQL\u4e2d\u4e8c\u8fdb\u5236\u65e5\u5fd7\u8bb0\u5f55\u548c\u590d\u5236\u4ee5\u53ca\u5176\u4e0e\u89e6\u53d1\u5668\u7684\u5173\u7cfb\u7684\u66f4\u591a\u4fe1\u606f\uff0c\u8bf7\u53c2\u8003\u5b98\u65b9MySQL\u6587\u6863\uff1a<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.0\/en\/binary-log.html\">\u4e8c\u8fdb\u5236\u65e5\u5fd7<\/a>\u548c<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.0\/en\/stored-programs-binary-logging.html\">\u5b58\u50a8\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u65e5\u5fd7\u8bb0\u5f55<\/a>\u3002\u60a8\u8fd8\u53ef\u4ee5\u67e5\u770b\u6211\u4eec\u7684\u6559\u7a0b\uff1a<a href=\"https:\/\/www.digitalocean.com\/community\/tutorials\/how-to-set-up-mysql-replication-on-ubuntu-18-04\">\u5982\u4f55\u5728MySQL\u4e2d\u8bbe\u7f6e\u590d\u5236<\/a>\u3002<\/p>\n<p>\u5728\u5177\u6709\u590d\u5236\u529f\u80fd\u548c\u4e25\u683c\u7684\u65f6\u95f4\u70b9\u6062\u590d\u8981\u6c42\u7684\u751f\u4ea7\u73af\u5883\u4e2d\u4f7f\u7528\u89e6\u53d1\u5668\u4e4b\u524d\uff0c\u8bf7\u786e\u4fdd\u60a8\u5df2\u7ecf\u6743\u8861\u4e86\u5176\u5bf9\u4e8c\u8fdb\u5236\u65e5\u5fd7\u4e00\u81f4\u6027\u7684\u5f71\u54cd\u3002<\/p>\n<div class=\"post-conf-note\">\n<p class=\"post-conf-desc\"><strong>\u8bf7\u6ce8\u610f\uff1a<\/strong>\u6839\u636e\u60a8\u7684MySQL\u7528\u6237\u6743\u9650\uff0c\u5f53\u6267\u884c<code>CREATE TRIGGER<\/code>\u547d\u4ee4\u65f6\u53ef\u80fd\u4f1a\u51fa\u73b0\u9519\u8bef\uff1a<code>ERROR 1142 (42000): TRIGGER\u547d\u4ee4\u88ab\u62d2\u7edd\uff0c\u7528\u6237'user'@'host'\u5bf9\u8868'collectibles'\u65e0\u6743\u9650\u3002<\/code>\u8981\u6388\u4e88\u7528\u6237<code>TRIGGER<\/code>\u6743\u9650\uff0c\u8bf7\u767b\u5f55MySQL\u4f5c\u4e3a<code>root<\/code>\u7528\u6237\u5e76\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\uff0c\u5c06<code>'sammy'@'localhost'<\/code>\u66ff\u6362\u4e3a\u6240\u9700\u7684MySQL\u7528\u6237\u540d\u548c\u4e3b\u673a\uff1a<\/p>\n<pre class=\"post-pre\"><code>GRANT TRIGGER on *.* TO 'sammy'@'localhost';\r\nFLUSH PRIVILEGES;<\/code><\/pre>\n<p>\u66f4\u65b0\u7528\u6237\u6743\u9650\u540e\uff0c\u8bf7\u6ce8\u9500<code>root<\/code>\u7528\u6237\uff0c\u91cd\u65b0\u4ee5\u60a8\u7684\u7528\u6237\u8eab\u4efd\u767b\u5f55\uff0c\u5e76\u91cd\u65b0\u8fd0\u884c<code>CREATE TRIGGER<\/code>\u8bed\u53e5\u3002<\/p>\n<\/div>\n<\/div>\n<p>MySQL\u4f1a\u6253\u5370\u4ee5\u4e0b\u6d88\u606f\u6765\u786e\u8ba4\u89e6\u53d1\u5668\u662f\u5426\u6210\u529f\u521b\u5efa\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>Query OK, 1 row affected (0.009 sec)<\/code><\/pre>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u73b0\u5728\u5c1d\u8bd5\u4f7f\u7528\u5c0f\u5199\u53c2\u6570\u5411<code>INSERT<\/code>\u67e5\u8be2\u63d2\u5165\u4e00\u4e2a\u65b0\u7684\u6536\u85cf\u54c1\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">INSERT INTO collectibles VALUES (<span class=\"token string\">&#8216;<mark>aircraft model<\/mark>&#8216;<\/span>, <span class=\"token number\">10.00<\/span>);<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u518d\u6b21\u68c0\u67e5<code>collectibles<\/code>\u8868\u4e2d\u7684\u7ed3\u679c\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">SELECT * FROM collectibles;<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u4ee5\u4e0b\u8f93\u51fa\u5c06\u4f1a\u6253\u5370\u5230\u5c4f\u5e55\u4e0a\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>+-----------------+-------+\r\n| name            | value |\r\n+-----------------+-------+\r\n| spaceship model | 12.50 |\r\n| <mark>AIRCRAFT MODEL<\/mark>    | 10.00 |\r\n+-----------------+-------+\r\n2 rows in set (0.000 sec)<\/code><\/pre>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u8fd9\u6b21\uff0c\u65b0\u63d2\u5165\u7684\u201c\u98de\u673a\u6a21\u578b\u201d\u540d\u79f0\u7684\u5927\u5c0f\u5199\u5168\u90e8\u4e3a\u5927\u5199\u5b57\u6bcd\uff0c\u4e0e\u60a8\u5c1d\u8bd5\u63d2\u5165\u7684\u539f\u59cb\u503c\u4e0d\u540c\u3002\u89e6\u53d1\u5668\u5728\u540e\u53f0\u8fd0\u884c\uff0c\u5728\u5c06\u884c\u4fdd\u5b58\u5230\u6570\u636e\u5e93\u4e4b\u524d\u8f6c\u6362\u4e86\u5b57\u6bcd\u7684\u5927\u5c0f\u5199\u3002<\/p>\n<p>\u73b0\u5728\uff0c\u6240\u6709\u65b0\u7684\u884c\u90fd\u7531\u89e6\u53d1\u5668\u4fdd\u62a4\uff0c\u786e\u4fdd\u540d\u79f0\u5c06\u4ee5\u5927\u5199\u4fdd\u5b58\u3002\u4f46\u662f\uff0c\u4ecd\u7136\u53ef\u4ee5\u4f7f\u7528<code>UPDATE<\/code>\u8bed\u53e5\u4fdd\u5b58\u4e0d\u53d7\u9650\u5236\u7684\u6570\u636e\u3002\u4e3a\u4e86\u4f7f\u7528\u76f8\u540c\u6548\u679c\u4fdd\u62a4<code>UPDATE<\/code>\u8bed\u53e5\uff0c\u521b\u5efa\u53e6\u4e00\u4e2a\u89e6\u53d1\u5668\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">CREATE TRIGGER <mark>uppercase_before_update BEFORE UPDATE<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\">ON collectibles<\/li>\n<li data-prefix=\"mysql&gt;\">FOR EACH ROW<\/li>\n<li data-prefix=\"mysql&gt;\"><mark>SET NEW.name = UPPER(NEW.name);<\/mark><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u4e24\u4e2a\u89e6\u53d1\u5668\u4e4b\u95f4\u7684\u533a\u522b\u5728\u4e8e\u89e6\u53d1\u6761\u4ef6\u3002\u8fd9\u6b21\u662f\u5728<code>UPDATE<\/code>\u4e4b\u524d\uff0c\u8fd9\u610f\u5473\u7740\u6bcf\u6b21\u5728\u8868\u4e0a\u6267\u884c<code>UPDATE<\/code>\u8bed\u53e5\u65f6\u89e6\u53d1\u5668\u90fd\u4f1a\u6267\u884c\u2014\u2014\u9664\u4e86\u4ee5\u524d\u7684\u89e6\u53d1\u5668\u5df2\u7ecf\u8986\u76d6\u7684\u65b0\u884c\u5916\uff0c\u8fd8\u4f1a\u5f71\u54cd\u5230\u6bcf\u6b21\u66f4\u65b0\u65f6\u7684\u73b0\u6709\u884c\u3002<\/p>\n<p>MySQL\u4f1a\u8f93\u51fa\u4e00\u4e2a\u786e\u8ba4\u4fe1\u606f\uff0c\u8868\u793a\u89e6\u53d1\u5668\u5df2\u6210\u529f\u521b\u5efa\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>Query OK, 0 rows affected (0.009 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u4e3a\u4e86\u9a8c\u8bc1\u65b0\u89e6\u53d1\u5668\u7684\u884c\u4e3a\uff0c\u8bf7\u5c1d\u8bd5\u66f4\u65b0\u201c\u592a\u7a7a\u98de\u8239\u6a21\u578b\u201d\u7684\u4ef7\u683c\u503c\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\"><code>UPDATE collectibles SET value = 15.00 WHERE name = '<mark>spaceship model<\/mark>';<\/code><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p><code>WHERE<\/code> \u5b50\u53e5\u901a\u8fc7\u540d\u79f0\u7b5b\u9009\u8981\u66f4\u65b0\u7684\u884c\uff0c\u5e76\u4e14 <code>SET<\/code> \u5b50\u53e5\u5c06\u503c\u66f4\u6539\u4e3a 15.00\u3002<\/p>\n<p>\u60a8\u5c06\u6536\u5230\u4ee5\u4e0b\u8f93\u51fa\uff0c\u786e\u8ba4\u8be5\u8bed\u53e5\u5df2\u66f4\u6539\u4e86\u4e00\u884c\u6570\u636e\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>Query OK, 1 row affected (0.002 sec) Rows matched: 1 Changed: 1 Warnings: 0<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u68c0\u67e5\u6536\u85cf\u54c1\u8868\u4e2d\u7684\u7ed3\u679c\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\"><code>SELECT * FROM collectibles;<\/code><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u4ee5\u4e0b\u8f93\u51fa\u5c06\u6253\u5370\u5230\u5c4f\u5e55\u4e0a\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>+&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+&#8212;&#8212;-+<\/p>\n<p>| name            | value |<\/p>\n<p>+&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+&#8212;&#8212;-+<\/p>\n<p>| <mark>SPACESHIP MODEL<\/mark> | <mark>15.00<\/mark> |<\/p>\n<p>| AIRCRAFT MODEL  | 10.00 |<\/p>\n<p>+&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+&#8212;&#8212;-+<\/p>\n<p>2 rows in set (0.000 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u73b0\u5728\uff0c\u9664\u4e86\u4ef7\u683c\u901a\u8fc7\u6267\u884c\u7684\u8bed\u53e5\u66f4\u65b0\u4e3a 15.00 \u4e4b\u5916\uff0c\u540d\u79f0\u73b0\u5728\u663e\u793a\u4e3a\u201c\u592a\u7a7a\u98de\u8239\u6a21\u578b\u201d\u3002\u5f53\u60a8\u8fd0\u884c <code>UPDATE<\/code> \u8bed\u53e5\u65f6\uff0c\u89e6\u53d1\u5668\u88ab\u6267\u884c\uff0c\u5f71\u54cd\u4e86\u66f4\u65b0\u884c\u4e0a\u7684\u503c\u3002\u5728\u4fdd\u5b58\u4e4b\u524d\uff0c\u540d\u79f0\u5217\u88ab\u8f6c\u6362\u4e3a\u5927\u5199\u3002<\/p>\n<p>\u5728\u672c\u8282\u4e2d\uff0c\u60a8\u521b\u5efa\u4e86\u4e24\u4e2a\u89e6\u53d1\u5668\uff0c\u5b83\u4eec\u5728\u63d2\u5165\u548c\u66f4\u65b0\u67e5\u8be2\u4e4b\u524d\u8fd0\u884c\uff0c\u4ee5\u4fbf\u5728\u5c06\u6570\u636e\u4fdd\u5b58\u5230\u6570\u636e\u5e93\u4e4b\u524d\u5bf9\u5176\u8fdb\u884c\u683c\u5f0f\u5316\u3002\u5728\u4e0b\u4e00\u8282\u4e2d\uff0c\u60a8\u5c06\u4f7f\u7528 <code>BEFORE DELETE<\/code> \u89e6\u53d1\u5668\u5c06\u88ab\u5220\u9664\u7684\u884c\u590d\u5236\u5230\u4e00\u4e2a\u5355\u72ec\u7684\u8868\u4e2d\u4ee5\u8fdb\u884c\u5f52\u6863\u3002<\/p>\n<h2>\u4f7f\u7528\u201cBEFORE DELETE\u201d\u89e6\u53d1\u5668\u5728\u5220\u9664\u884c\u4e4b\u524d\u6267\u884c\u64cd\u4f5c<\/h2>\n<p>\u5373\u4f7f\u60a8\u4e0d\u518d\u62e5\u6709\u67d0\u4e2a\u7269\u54c1\uff0c\u60a8\u53ef\u80fd\u4ecd\u5e0c\u671b\u5728\u5355\u72ec\u7684\u8868\u4e2d\u4fdd\u7559\u6709\u5173\u5df2\u5220\u9664\u6761\u76ee\u7684\u4fe1\u606f\u3002\u5728\u672c\u6559\u7a0b\u7684\u5f00\u59cb\uff0c\u60a8\u521b\u5efa\u4e86\u4e00\u4e2a\u540d\u4e3a <code>collectibles_archive<\/code> \u7684\u7b2c\u4e8c\u4e2a\u8868\uff0c\u7528\u4e8e\u8ddf\u8e2a\u5df2\u4ece\u6536\u85cf\u4e2d\u5220\u9664\u7684\u6240\u6709\u6536\u85cf\u54c1\u3002\u5728\u672c\u8282\u4e2d\uff0c\u60a8\u5c06\u4f7f\u7528\u4e00\u4e2a\u89e6\u53d1\u5668\u6765\u5f52\u6863\u5df2\u5220\u9664\u7684\u6761\u76ee\uff0c\u8be5\u89e6\u53d1\u5668\u5c06\u5728\u6267\u884c <code>DELETE<\/code> \u8bed\u53e5\u4e4b\u524d\u6267\u884c\u3002<\/p>\n<p>\u901a\u8fc7\u6267\u884c\u4e0b\u9762\u7684\u8bed\u53e5\u68c0\u67e5\u5f52\u6863\u8868\u662f\u5426\u5b8c\u5168\u4e3a\u7a7a\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\"><code>SELECT * FROM collectibles_archive;<\/code><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u4ee5\u4e0b\u8f93\u51fa\u5c06\u6253\u5370\u5230\u5c4f\u5e55\u4e0a\uff0c\u786e\u8ba4 <code>collectibles_archive<\/code> \u8868\u4e3a\u7a7a\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>Empty set (0.000 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u73b0\u5728\uff0c\u5982\u679c\u60a8\u5bf9 <code>collectibles<\/code> \u8868\u53d1\u8d77\u4e00\u6761\u5220\u9664\u67e5\u8be2\uff0c\u4efb\u4f55\u4e00\u884c\u6570\u636e\u90fd\u53ef\u80fd\u88ab\u65e0\u75d5\u5220\u9664\u3002<\/p>\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u60a8\u5c06\u521b\u5efa\u4e00\u4e2a\u89e6\u53d1\u5668\uff0c\u5728\u6240\u6709\u5bf9 <code>collectibles<\/code> \u8868\u7684 <code>DELETE<\/code> \u67e5\u8be2\u4e4b\u524d\u6267\u884c\u3002\u8be5\u89e6\u53d1\u5668\u7684\u76ee\u7684\u662f\u5728\u5220\u9664\u4e4b\u524d\u5c06\u5220\u9664\u5bf9\u8c61\u7684\u526f\u672c\u4fdd\u5b58\u5230\u5f52\u6863\u8868\u4e2d\u3002<\/p>\n<p>\u8fd0\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\"><code>CREATE TRIGGER <mark>archive_before_delete BEFORE DELETE<\/mark><\/code><\/li>\n<li data-prefix=\"mysql&gt;\"><code>ON collectibles<\/code><\/li>\n<li data-prefix=\"mysql&gt;\"><code>FOR EACH ROW<\/code><\/li>\n<li data-prefix=\"mysql&gt;\"><code><mark>INSERT INTO collectibles_archive (name, value) VALUES (OLD.name, OLD.value);<\/mark><\/code><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u89e6\u53d1\u5668\u88ab\u547d\u540d\u4e3a <code>archive_before_delete<\/code>\uff0c\u5e76\u4e14\u5728 <code>collectibles<\/code> \u8868\u4e0a\u7684\u4efb\u4f55 <code>DELETE<\/code> \u67e5\u8be2\u4e4b\u524d\u89e6\u53d1\u3002\u5bf9\u4e8e\u5c06\u8981\u5220\u9664\u7684\u6bcf\u4e00\u884c\uff0c\u5c06\u6267\u884c <code>INSERT<\/code> \u8bed\u53e5\u3002\u7136\u540e\uff0c<code>INSERT<\/code> \u8bed\u53e5\u4f1a\u5c06\u4e00\u4e2a\u65b0\u884c\u63d2\u5165\u5230 <code>collectibles_archive<\/code> \u8868\u4e2d\uff0c\u8be5\u884c\u7684\u6570\u636e\u503c\u53d6\u81ea\u5373\u5c06\u5220\u9664\u7684 <code>OLD<\/code> \u8bb0\u5f55\uff1a<code>OLD.name<\/code> \u53d8\u4e3a <code>name<\/code> \u5217\uff0c<code>OLD.value<\/code> \u53d8\u4e3a <code>value<\/code> \u5217\u3002<\/p>\n<p>\u6570\u636e\u5e93\u5c06\u786e\u8ba4\u89e6\u53d1\u5668\u7684\u521b\u5efa\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>Query OK, 0 rows affected (0.009 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u5c06\u89e6\u53d1\u5668\u51c6\u5907\u597d\u540e\uff0c\u5c1d\u8bd5\u4ece\u4e3b\u8981\u7684\u6536\u85cf\u8868\u4e2d\u5220\u9664\u4e00\u4e2a\u6536\u85cf\u54c1\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\"><code>DELETE FROM collectibles WHERE name = '<mark>SPACESHIP MODEL<\/mark>';<\/code><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\u8bc1\u5b9e\u4e86\u67e5\u8be2\u6210\u529f\u8fd0\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>Query OK, 1 row affected (0.004 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u73b0\u5728\uff0c\u5217\u51fa\u6240\u6709\u7684\u6536\u85cf\u54c1\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\"><code>SELECT * FROM collectibles;<\/code><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u4ee5\u4e0b\u7ed3\u679c\u5c06\u6253\u5370\u5728\u5c4f\u5e55\u4e0a\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>+&#8212;&#8212;&#8212;&#8212;&#8212;-+&#8212;&#8212;-+ | name | value | +&#8212;&#8212;&#8212;&#8212;&#8212;-+&#8212;&#8212;-+ | AIRCRAFT MODEL | 10.00 | +&#8212;&#8212;&#8212;&#8212;&#8212;-+&#8212;&#8212;-+ 1 row in set (0.000 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u76ee\u524d\u53ea\u5269\u4e0b\u98de\u673a\u6a21\u578b\uff1b\u592a\u7a7a\u8239\u6a21\u578b\u5df2\u88ab\u5220\u9664\uff0c\u4e0d\u518d\u5728\u684c\u5b50\u4e0a\u3002\u4e0d\u8fc7\uff0c\u501f\u52a9\u4e4b\u524d\u521b\u5efa\u7684\u89e6\u53d1\u5668\uff0c\u8fd9\u4e2a\u5220\u9664\u5e94\u8be5\u4f1a\u88ab\u8bb0\u5f55\u5728collectibles_archive\u8868\u4e2d\u3002\u6211\u4eec\u6765\u68c0\u67e5\u4e00\u4e0b\u3002<\/p>\n<p>\u6267\u884c\u53e6\u4e00\u4e2a\u67e5\u8be2<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">SELECT * FROM collectibles_archive<span class=\"token punctuation\">;<\/span><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u4ee5\u4e0b\u7ed3\u679c\u5c06\u6253\u5370\u5230\u5c4f\u5e55\u4e0a\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>+&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+&#8212;&#8212;-+&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;+ | name | value | removed_on | +&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+&#8212;&#8212;-+&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;+ | <mark>SPACESHIP MODEL<\/mark> | 15.00 | 2022-11-20 11:32:01 | +&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+&#8212;&#8212;-+&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;+ 1 row in set (0.000 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u901a\u8fc7\u89e6\u53d1\u5668\uff0c\u5728\u8be5\u8868\u4e2d\u81ea\u52a8\u8bb0\u5f55\u4e86\u5220\u9664\u64cd\u4f5c\u3002\u59d3\u540d\u548c\u6570\u503c\u5217\u7531\u88ab\u5220\u9664\u7684\u884c\u4e2d\u7684\u6570\u636e\u586b\u5145\u3002\u7b2c\u4e09\u5217&#8221;removed_on&#8221;\u5e76\u6ca1\u6709\u5728\u5b9a\u4e49\u7684\u89e6\u53d1\u5668\u4e2d\u663e\u5f0f\u8bbe\u7f6e\uff0c\u6240\u4ee5\u5b83\u4f1a\u91c7\u7528\u5728\u8868\u521b\u5efa\u65f6\u51b3\u5b9a\u7684\u9ed8\u8ba4\u503c\uff1a\u4efb\u4f55\u65b0\u884c\u7684\u521b\u5efa\u65e5\u671f\u3002\u56e0\u6b64\uff0c\u901a\u8fc7\u89e6\u53d1\u5668\u6dfb\u52a0\u7684\u6bcf\u4e2a\u6761\u76ee\u90fd\u5c06\u59cb\u7ec8\u9644\u5e26\u5220\u9664\u65e5\u671f\u7684\u6ce8\u91ca\u3002<\/p>\n<p>\u8bbe\u7f6e\u4e86\u8fd9\u4e2a\u89e6\u53d1\u5668\u540e\uff0c\u4f60\u53ef\u4ee5\u786e\u4fdd\u6240\u6709\u7684DELETE\u67e5\u8be2\u90fd\u4f1a\u5728collectibles_archive\u4e2d\u751f\u6210\u4e00\u6761\u65e5\u5fd7\u8bb0\u5f55\uff0c\u7559\u4e0b\u5173\u4e8e\u4ee5\u524d\u62e5\u6709\u7684\u6536\u85cf\u54c1\u7684\u4fe1\u606f\u3002<\/p>\n<p>\u5728\u4e0b\u4e00\u90e8\u5206\u4e2d\uff0c\u60a8\u5c06\u4f7f\u7528\u5728\u89e6\u53d1\u8bed\u53e5\u4e4b\u540e\u6267\u884c\u7684\u89e6\u53d1\u5668\uff0c\u6839\u636e\u6240\u6709\u53ef\u6536\u96c6\u9879\u7684\u6c47\u603b\u503c\u66f4\u65b0\u6458\u8981\u8868\u3002<\/p>\n<h2>\u4f7f\u7528 AFTER INSERT\u3001AFTER UPDATE \u548c AFTER DELETE \u89e6\u53d1\u5668\u6765\u5728\u6570\u636e\u64cd\u7eb5\u540e\u6267\u884c\u64cd\u4f5c\u3002\u5728\u4e4b\u524d\u7684\u4e24\u4e2a\u90e8\u5206\u4e2d\uff0c\u60a8\u4f7f\u7528\u5728\u4e3b\u8bed\u53e5\u4e4b\u524d\u6267\u884c\u7684\u89e6\u53d1\u5668\u6765\u6839\u636e\u66f4\u65b0\u6570\u636e\u5e93\u4e4b\u524d\u7684\u539f\u59cb\u6570\u636e\u6267\u884c\u64cd\u4f5c\u3002\u5728\u672c\u8282\u4e2d\uff0c\u60a8\u5c06\u4f7f\u7528\u5728\u4e3b\u8bed\u53e5\u4e4b\u540e\u6267\u884c\u7684\u89e6\u53d1\u5668\u6765\u66f4\u65b0\u6458\u8981\u8868\uff0c\u5176\u4e2d\u5305\u62ec\u59cb\u7ec8\u6700\u65b0\u7684\u8ba1\u6570\u548c\u6240\u6709\u6536\u85cf\u54c1\u7684\u7d2f\u8ba1\u4ef7\u503c\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u60a8\u53ef\u4ee5\u786e\u4fdd\u6458\u8981\u8868\u4e2d\u7684\u6570\u636e\u8003\u8651\u5230\u6570\u636e\u5e93\u7684\u5f53\u524d\u72b6\u6001\u3002<\/p>\n<p>\u9996\u5148\uff0c\u68c0\u67e5collectibles_stats\u8868\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">SELECT * FROM collectibles_stats<span class=\"token punctuation\">;<\/span><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u65e2\u7136\u60a8\u8fd8\u672a\u5411\u8be5\u8868\u6dfb\u52a0\u4fe1\u606f\uff0c\u62e5\u6709\u7684\u6536\u85cf\u54c1\u6570\u91cf\u4e3a0\uff0c\u56e0\u6b64\u7d2f\u8ba1\u4ef7\u503c\u4e3aNULL\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>+&#8212;&#8212;-+&#8212;&#8212;-+ | count | value | +&#8212;&#8212;-+&#8212;&#8212;-+ | 0 | NULL | +&#8212;&#8212;-+&#8212;&#8212;-+ 1 row in set (0.000 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u7531\u4e8e\u8be5\u8868\u6ca1\u6709\u89e6\u53d1\u5668\uff0c\u4e4b\u524d\u53d1\u51fa\u7684\u7528\u4e8e\u63d2\u5165\u548c\u66f4\u65b0\u7684\u67e5\u8be2\u5bf9\u8be5\u8868\u6ca1\u6709\u5f71\u54cd\u3002<\/p>\n<p>\u76ee\u6807\u662f\u5c06collectibles_stats\u8868\u4e2d\u7684\u4e00\u884c\u503c\u8bbe\u7f6e\u4e3a\u5173\u4e8e\u6536\u85cf\u54c1\u6570\u91cf\u548c\u603b\u4ef7\u503c\u7684\u6700\u65b0\u4fe1\u606f\u3002\u60a8\u5e0c\u671b\u786e\u4fdd\u5728\u6bcf\u6b21\u63d2\u5165\u3001\u66f4\u65b0\u6216\u5220\u9664\u64cd\u4f5c\u540e\uff0c\u8868\u5185\u5bb9\u90fd\u4f1a\u5f97\u5230\u66f4\u65b0\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u901a\u8fc7\u521b\u5efa\u4e09\u4e2a\u5355\u72ec\u7684\u89e6\u53d1\u5668\u6765\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff0c\u6240\u6709\u89e6\u53d1\u5668\u5728\u76f8\u5e94\u7684\u67e5\u8be2\u4e4b\u540e\u6267\u884c\u3002\u9996\u5148\uff0c\u521b\u5efa\u4e00\u4e2a&#8221;AFTER INSERT&#8221;\u89e6\u53d1\u5668\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">CREATE TRIGGER <mark>stats_after_insert AFTER INSERT<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\">ON collectibles<\/li>\n<li data-prefix=\"mysql&gt;\">FOR EACH ROW<\/li>\n<li data-prefix=\"mysql&gt;\"><mark>UPDATE collectibles_stats<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><mark>SET count <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><mark>SELECT COUNT<span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">)<\/span> FROM collectibles<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><mark><span class=\"token punctuation\">)<\/span>, value <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><mark>SELECT SUM<span class=\"token punctuation\">(<\/span>value<span class=\"token punctuation\">)<\/span> FROM collectibles<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><mark><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/mark><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u89e6\u53d1\u5668\u88ab\u547d\u540d\u4e3astats_after_insert\uff0c\u5e76\u5c06\u5728\u6bcf\u6b21\u5411collectibles\u8868\u6267\u884cINSERT\u67e5\u8be2\u540e\u6267\u884c\uff0c\u8fd0\u884c\u89e6\u53d1\u5668\u4f53\u4e2d\u7684UPDATE\u8bed\u53e5\u3002\u8fd9\u4e2aUPDATE\u67e5\u8be2\u4f1a\u5f71\u54cdcollectibles_stats\u8868\uff0c\u5e76\u5c06count\u548cvalue\u5217\u8bbe\u7f6e\u4e3a\u5d4c\u5957\u67e5\u8be2\u8fd4\u56de\u7684\u503c\u3002<\/p>\n<ul class=\"post-ul\">\n<li>SELECT COUNT(name) FROM collectibles will get the collectibles count.<\/li>\n<li>SELECT SUM(value) FROM collectibles will get the total worth of all collectibles.<\/li>\n<\/ul>\n<p>\u6570\u636e\u5e93\u5c06\u786e\u8ba4\u89e6\u53d1\u5668\u7684\u521b\u5efa\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>Query OK, 0 row affected (0.009 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u73b0\u5728\uff0c\u8bd5\u7740\u5c06\u5148\u524d\u5220\u9664\u7684\u592a\u7a7a\u98de\u8239\u6a21\u578b\u91cd\u65b0\u63d2\u5165\u5230\u6536\u85cf\u54c1\u8868\u4e2d\uff0c\u4ee5\u68c0\u67e5\u6458\u8981\u8868\u662f\u5426\u4f1a\u88ab\u6b63\u786e\u66f4\u65b0\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">INSERT INTO collectibles VALUES <span class=\"token punctuation\">(<\/span><span class=\"token string\">&#8216;spaceship model&#8217;<\/span>, <span class=\"token number\">15.00<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u6570\u636e\u5e93\u5c06\u6253\u5370\u4ee5\u4e0b\u6210\u529f\u6d88\u606f\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/p>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528\u89e6\u53d1\u5668\u300b\u7684\u7b2c7\u90e8\u5206\uff08\u51719\u90e8\u5206\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>Query OK, 1 row affected (0.009 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u60a8\u53ef\u4ee5\u901a\u8fc7\u8fd0\u884c\u547d\u4ee4\u6765\u5217\u51fa\u6240\u6709\u62e5\u6709\u7684\u6536\u85cf\u54c1\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">SELECT * FROM collectibles;<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u4e0b\u9762\u7684\u8f93\u51fa\u5c06\u6253\u5370\u5230\u5c4f\u5e55\u4e0a\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<pre><code>+-----------------+-------+\r\n| name            | value |\r\n+-----------------+-------+\r\n| AIRCRAFT MODEL  | 10.00 |\r\n| SPACESHIP MODEL | 15.00 |\r\n+-----------------+-------+\r\n2 rows in set (0.000 sec)<\/code><\/pre>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u73b0\u5728\u6709\u4e24\u4e2a\u503c\u5f97\u6536\u85cf\u7684\u7269\u54c1\uff0c\u603b\u4ef7\u503c\u4e3a25.00\u3002\u8981\u5728\u63d2\u5165\u65b0\u7269\u54c1\u540e\u68c0\u67e5\u6c47\u603b\u8868\uff0c\u8bf7\u6267\u884c\u4ee5\u4e0b\u67e5\u8be2\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">SELECT * FROM collectibles_stats;<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u8fd9\u6b21\uff0c\u6c47\u603b\u8868\u5c06\u5217\u51fa\u6240\u6709\u62e5\u6709\u7684\u6536\u85cf\u54c1\u6570\u91cf\u4e3a2\uff0c\u7d2f\u8ba1\u4ef7\u503c\u4e3a25.00\uff0c\u4e0e\u4e4b\u524d\u7684\u8f93\u51fa\u4e00\u81f4\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<pre><code>+-------+-------+\r\n| count | value |\r\n+-------+-------+\r\n|     2 | 25.00 |\r\n+-------+-------+\r\n1 row in set (0.000 sec)<\/code><\/pre>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p><code>stats_after_insert<\/code> \u89e6\u53d1\u5668\u5728\u63d2\u5165\u67e5\u8be2\u540e\u8fd0\u884c\uff0c\u5e76\u4f7f\u7528\u5f53\u524d\u6570\u636e\uff08\u8ba1\u6570\u548c\u4ef7\u503c\uff09\u66f4\u65b0 <code>collectibles_stats<\/code> \u8868\uff0c\u4ece\u800c\u7edf\u8ba1\u6574\u4e2a\u6536\u85cf\u54c1\u7684\u5185\u5bb9\u3002\u7edf\u8ba1\u6570\u636e\u5305\u62ec\u6574\u4e2a\u6536\u85cf\u5185\u5bb9\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u6700\u540e\u4e00\u6b21\u63d2\u5165\u3002\u7531\u4e8e\u6536\u85cf\u73b0\u5728\u5305\u542b\u98de\u673a\u548c\u592a\u7a7a\u8239\u6a21\u578b\u4e24\u4e2a\u7269\u54c1\uff0c\u6c47\u603b\u8868\u5217\u51fa\u4e86\u4e24\u4e2a\u7269\u54c1\u53ca\u5b83\u4eec\u7684\u603b\u4ef7\u503c\u3002\u6b64\u65f6\uff0c\u5c06\u4efb\u4f55\u65b0\u7684\u6536\u85cf\u7269\u54c1\u6dfb\u52a0\u5230 <code>collectibles<\/code> \u8868\u90fd\u5c06\u6b63\u786e\u66f4\u65b0\u6c47\u603b\u8868\u7684\u503c\u3002<\/p>\n<p>\u7136\u800c\uff0c\u66f4\u65b0\u73b0\u6709\u7269\u54c1\u6216\u5220\u9664\u6536\u85cf\u54c1\u4e0d\u4f1a\u5bf9\u6c47\u603b\u4ea7\u751f\u4efb\u4f55\u5f71\u54cd\u3002\u4e3a\u4e86\u586b\u8865\u8fd9\u4e2a\u7a7a\u767d\uff0c\u60a8\u5c06\u521b\u5efa\u4e24\u4e2a\u989d\u5916\u7684\u89e6\u53d1\u5668\uff0c\u6267\u884c\u76f8\u540c\u7684\u64cd\u4f5c\uff0c\u4f46\u7531\u4e0d\u540c\u7684\u4e8b\u4ef6\u89e6\u53d1\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">CREATE TRIGGER <mark>stats_after_update AFTER UPDATE<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\">ON collectibles<\/li>\n<li data-prefix=\"mysql&gt;\">FOR EACH ROW<\/li>\n<li data-prefix=\"mysql&gt;\"><mark>UPDATE collectibles_stats<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><mark>SET count = (<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><mark>SELECT COUNT(name) FROM collectibles<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><mark>), value = (<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><mark>SELECT SUM(value) FROM collectibles<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><mark>);<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><\/li>\n<li data-prefix=\"mysql&gt;\">CREATE TRIGGER <mark>stats_after_delete AFTER DELETE<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\">ON collectibles<\/li>\n<li data-prefix=\"mysql&gt;\">FOR EACH ROW<\/li>\n<li data-prefix=\"mysql&gt;\"><mark>UPDATE collectibles_stats<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><mark>SET count = (<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><mark>SELECT COUNT(name) FROM collectibles<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><mark>), value = (<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><mark>SELECT SUM(value) FROM collectibles<\/mark><\/li>\n<li data-prefix=\"mysql&gt;\"><mark>);<\/mark><\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u60a8\u73b0\u5728\u5df2\u7ecf\u521b\u5efa\u4e86\u4e24\u4e2a\u65b0\u89e6\u53d1\u5668\uff1a<code>stats_after_update<\/code> \u548c <code>stats_after_delete<\/code>\u3002\u6bcf\u5f53\u60a8\u5728 <code>collectibles<\/code> \u8868\u4e0a\u8fd0\u884c <code>UPDATE<\/code> \u6216 <code>DELETE<\/code> \u8bed\u53e5\u65f6\uff0c\u8fd9\u4e24\u4e2a\u89e6\u53d1\u5668\u5c06\u5728 <code>collectible_stats<\/code> \u8868\u4e0a\u6267\u884c\u3002<\/p>\n<p>\u90a3\u4e9b\u89e6\u53d1\u5668\u7684\u6210\u529f\u521b\u5efa\u5c06\u6253\u5370\u4ee5\u4e0b\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<pre><code>Query OK, 0 row affected (0.009 sec)<\/code><\/pre>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u73b0\u5728\uff0c\u66f4\u65b0\u4e00\u4ef6\u6536\u85cf\u54c1\u7684\u4ef7\u683c\u503c\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">UPDATE collectibles SET value = 25.00 WHERE name = &#8216;AIRCRAFT MODEL&#8217;;<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p><code>WHERE<\/code> \u5b50\u53e5\u6839\u636e\u540d\u79f0\u8fc7\u6ee4\u8981\u66f4\u65b0\u7684\u884c\uff0c<code>SET<\/code> \u5b50\u53e5\u5c06\u503c\u66f4\u6539\u4e3a25.00\u3002<\/p>\n<p>\u8f93\u51fa\u7ed3\u679c\u8bc1\u5b9e\u8be5\u8bed\u53e5\u6539\u53d8\u4e86\u4e00\u884c\u6570\u636e\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528\u89e6\u53d1\u5668\u300b\u7684\u7b2c8\u90e8\u5206\uff08\u51719\u90e8\u5206\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>Query OK, 1 row affected (0.002 sec) Rows matched: 1 Changed: 1 Warnings: 0<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u66f4\u65b0\u540e\uff0c\u8bf7\u518d\u6b21\u68c0\u67e5\u6458\u8981\u8868\u7684\u5185\u5bb9\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">SELECT * FROM collectibles_stats;<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u73b0\u5728\u7684\u4ef7\u503c\u663e\u793a\u4e3a40.00\uff0c\u8fd9\u662f\u66f4\u65b0\u540e\u7684\u6b63\u786e\u4ef7\u503c\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>+&#8212;&#8212;-+&#8212;&#8212;-+<\/p>\n<p>| count | value |<\/p>\n<p>+&#8212;&#8212;-+&#8212;&#8212;-+<\/p>\n<p>| 2     | 40.00 |<\/p>\n<p>+&#8212;&#8212;-+&#8212;&#8212;-+<\/p>\n<p>1 row in set (0.000 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<\/div>\n<p>\u6700\u540e\u4e00\u6b65\u662f\u786e\u4fdd\u6458\u8981\u8868\u80fd\u591f\u6b63\u786e\u53cd\u6620\u5220\u9664\u6536\u85cf\u54c1\u7684\u60c5\u51b5\u3002\u8bf7\u5c1d\u8bd5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u53e5\u5220\u9664\u98de\u673a\u6a21\u578b\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">DELETE FROM collectibles WHERE name = &#8216;AIRCRAFT MODEL&#8217;;<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u4ee5\u4e0b\u8f93\u51fa\u8bc1\u5b9e\u4e86\u67e5\u8be2\u6210\u529f\u8fd0\u884c\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>Query OK, 1 row affected (0.004 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<\/div>\n<p>\u73b0\u5728\uff0c\u5217\u51fa\u6240\u6709\u7684\u6536\u85cf\u54c1\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">SELECT * FROM collectibles;<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u4ee5\u4e0b\u8f93\u51fa\u5c06\u6253\u5370\u5230\u5c4f\u5e55\u4e0a\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>+&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+&#8212;&#8212;-+<\/p>\n<p>| name            | value |<\/p>\n<p>+&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+&#8212;&#8212;-+<\/p>\n<p>| SPACESHIP MODEL | 15.00 |<\/p>\n<p>+&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+&#8212;&#8212;-+<\/p>\n<p>1 row in set (0.000 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<\/div>\n<p>\u73b0\u5728\u53ea\u5269\u4e0b\u592a\u7a7a\u98de\u8239\u6a21\u578b\u3002\u63a5\u4e0b\u6765\uff0c\u68c0\u67e5\u6458\u8981\u8868\u4e2d\u7684\u6570\u503c\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">SELECT * FROM collectibles_stats;<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u4ee5\u4e0b\u8f93\u51fa\u5c06\u6253\u5370\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>+&#8212;&#8212;-+&#8212;&#8212;-+<\/p>\n<p>| count | value |<\/p>\n<p>+&#8212;&#8212;-+&#8212;&#8212;-+<\/p>\n<p>| 1     | 15.00 |<\/p>\n<p>+&#8212;&#8212;-+&#8212;&#8212;-+<\/p>\n<p>1 row in set (0.000 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<\/div>\n<p>\u8ba1\u6570\u5217\u73b0\u5728\u663e\u793a\u4e3b\u8868\u4e2d\u53ea\u6709\u4e00\u4e2a\u6536\u85cf\u54c1\u3002\u603b\u4ef7\u503c\u4e3a15.00\uff0c\u4e0e\u592a\u7a7a\u98de\u8239\u6a21\u578b\u7684\u4ef7\u503c\u76f8\u5339\u914d\u3002<\/p>\n<p>\u5728\u63d2\u5165\u3001\u66f4\u65b0\u548c\u5220\u9664\u67e5\u8be2\u4e4b\u540e\uff0c\u8fd9\u4e09\u4e2a\u89e6\u53d1\u5668\u5171\u540c\u5de5\u4f5c\uff0c\u4ee5\u4f7f\u6458\u8981\u8868\u4e0e\u5b8c\u6574\u7684\u6536\u85cf\u54c1\u5217\u8868\u4fdd\u6301\u540c\u6b65\u3002<\/p>\n<p>\u5728\u4e0b\u4e00\u90e8\u5206\u4e2d\uff0c\u60a8\u5c06\u5b66\u4e60\u5982\u4f55\u64cd\u4f5c\u6570\u636e\u5e93\u4e0a\u73b0\u6709\u7684\u89e6\u53d1\u5668\u3002<\/p>\n<h2>\u5217\u51fa\u548c\u5220\u9664\u89e6\u53d1\u5668<\/h2>\n<p>\u5728\u4e4b\u524d\u7684\u7ae0\u8282\u4e2d\uff0c\u60a8\u521b\u5efa\u4e86\u65b0\u7684\u89e6\u53d1\u5668\u3002\u7531\u4e8e\u89e6\u53d1\u5668\u662f\u5728\u6570\u636e\u5e93\u4e0a\u5b9a\u4e49\u7684\u547d\u540d\u5bf9\u8c61\uff0c\u4e0e\u8868\u683c\u7c7b\u4f3c\uff0c\u56e0\u6b64\u60a8\u53ef\u4ee5\u5728\u9700\u8981\u65f6\u5217\u51fa\u5b83\u4eec\u5e76\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<p>\u8981\u5217\u51fa\u6240\u6709\u89e6\u53d1\u5668\uff0c\u8bf7\u6267\u884c\u201cSHOW TRIGGERS\u201d\u8bed\u53e5\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">SHOW TRIGGERS;<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u8f93\u51fa\u5c06\u5305\u62ec\u6240\u6709\u89e6\u53d1\u5668\uff0c\u5305\u62ec\u5b83\u4eec\u7684\u540d\u79f0\u3001\u89e6\u53d1\u4e8b\u4ef6\uff08\u5728\u8bed\u53e5\u6267\u884c\u4e4b\u524d\u6216\u4e4b\u540e\uff09\uff0c\u4ee5\u53ca\u4f5c\u4e3a\u89e6\u53d1\u5668\u4e3b\u4f53\u4e00\u90e8\u5206\u7684\u8bed\u53e5\u548c\u89e6\u53d1\u5668\u5b9a\u4e49\u7684\u5176\u4ed6\u8be6\u7ec6\u4fe1\u606f\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output, simplified for readability\">\u8f93\u51fa\uff0c\u4e3a\u4fbf\u4e8e\u9605\u8bfb\u5df2\u7b80\u5316<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>+&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-+&#8212;&#8212;&#8211;+&#8212;&#8212;&#8212;&#8212;&#8211;+&#8212;&#8212;&#8211;(&#8230;)+&#8212;&#8212;&#8211;+(&#8230;)<\/p>\n<p>| Trigger                 | Event  | Table        | Statement  | Timing |(&#8230;)<\/p>\n<p>+&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-+&#8212;&#8212;&#8211;+&#8212;&#8212;&#8212;&#8212;&#8211;+&#8212;&#8212;&#8211;(&#8230;)+&#8212;&#8212;&#8211;+(&#8230;)<\/p>\n<p>| uppercase_before_insert | INSERT | collectibles | SET (&#8230;)  | BEFORE |(&#8230;)<\/p>\n<p>| stats_after_insert      | INSERT | collectibles | UPDATE (&#8230;) | AFTER  |(&#8230;)<\/p>\n<p>| uppercase_before_update | UPDATE | collectibles | SET (&#8230;)  | BEFORE |(&#8230;)<\/p>\n<p>| stats_after_update      | UPDATE | collectibles | UPDATE (&#8230;) | AFTER  |(&#8230;)<\/p>\n<p>| archive_before_delete   | DELETE | collectibles | INSERT (&#8230;) | BEFORE |(&#8230;)<\/p>\n<p>| stats_after_delete      | DELETE | collectibles | UPDATE (&#8230;) | AFTER  |(&#8230;)<\/p>\n<p>+&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-+&#8212;&#8212;&#8211;+&#8212;&#8212;&#8212;&#8212;&#8211;+&#8212;&#8212;&#8211;(&#8230;)+&#8212;&#8212;&#8211;+(&#8230;)<\/p>\n<p>6 rows in set (0.001 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<\/div>\n<p>\u8981\u5220\u9664\u73b0\u6709\u89e6\u53d1\u5668\uff0c\u53ef\u4ee5\u4f7f\u7528<code>DROP TRIGGER<\/code> SQL\u8bed\u53e5\u3002\u4e5f\u8bb8\u60a8\u4e0d\u518d\u5e0c\u671b\u5bf9\u6536\u85cf\u54c1\u540d\u79f0\u5f3a\u5236\u4f7f\u7528\u5927\u5199\u5b57\u6bcd\uff0c\u56e0\u6b64\u4e0d\u518d\u9700\u8981<code>uppercase_before_insert<\/code>\u548c<code>uppercase_before_update<\/code>\u89e6\u53d1\u5668\u3002\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\u6765\u5220\u9664\u8fd9\u4e24\u4e2a\u89e6\u53d1\u5668\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">DROP TRIGGER uppercase_before_insert;<\/li>\n<li data-prefix=\"mysql&gt;\">DROP TRIGGER uppercase_before_update;<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u5bf9\u4e8e\u8fd9\u4e24\u4e2a\u547d\u4ee4\uff0cMySQL\u4f1a\u8fd4\u56de\u4e00\u4e2a\u6210\u529f\u7684\u6d88\u606f\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>Query OK, 0 rows affected (0.004 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u73b0\u5728\uff0c\u65e2\u7136\u4e24\u4e2a\u89e6\u53d1\u5668\u90fd\u5df2\u79fb\u9664\uff0c\u8ba9\u6211\u4eec\u65b0\u589e\u4e00\u4e2a\u540d\u79f0\u4e3a\u5c0f\u5199\u5b57\u6bcd\u7684\u53ef\u6536\u96c6\u7269\u54c1\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">INSERT INTO collectibles VALUES (<span class=\"token string\">&#8216;<mark>ship model<\/mark>&#8216;<\/span>, <span class=\"token number\">10.00<\/span>);<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u6570\u636e\u5e93\u5c06\u786e\u8ba4\u63d2\u5165\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>Query OK, 1 row affected (0.009 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u60a8\u53ef\u4ee5\u901a\u8fc7\u6267\u884cSELECT\u67e5\u8be2\u6765\u9a8c\u8bc1\u662f\u5426\u5df2\u6210\u529f\u63d2\u5165\u8be5\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"mysql&gt;\">SELECT * FROM collectibles;<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u4ee5\u4e0b\u8f93\u51fa\u5c06\u663e\u793a\u5728\u5c4f\u5e55\u4e0a\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>+&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+&#8212;&#8212;-+<\/p>\n<p>| name            | value |<\/p>\n<p>+&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+&#8212;&#8212;-+<\/p>\n<p>| SPACESHIP MODEL | 15.00 |<\/p>\n<p>| <mark>ship model<\/mark>      | 10.00 |<\/p>\n<p>+&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;+&#8212;&#8212;-+<\/p>\n<p>2 rows in set (0.000 sec)<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u65b0\u6dfb\u52a0\u7684\u53ef\u6536\u96c6\u54c1\u540d\u79f0\u662f\u5c0f\u5199\u5b57\u6bcd\u3002\u7531\u4e8e\u540d\u79f0\u4e0e\u539f\u59cb\u8f93\u51fa\u4fdd\u6301\u4e0d\u53d8\uff0c\u60a8\u5df2\u786e\u8ba4\u5148\u524d\u7528\u4e8e\u8f6c\u6362\u5b57\u6bcd\u5927\u5c0f\u5199\u7684\u89e6\u53d1\u5668\u5df2\u4e0d\u518d\u751f\u6548\u3002<\/p>\n<p>\u73b0\u5728\u60a8\u5df2\u7ecf\u4e86\u89e3\u4e86\u5982\u4f55\u901a\u8fc7\u540d\u79f0\u5217\u4e3e\u548c\u5220\u9664\u89e6\u53d1\u5668\u3002<\/p>\n<h2>\u7ed3\u8bba<\/h2>\n<p>\u901a\u8fc7\u9075\u5faa\u672c\u6307\u5357\uff0c\u60a8\u5b66\u4f1a\u4e86\u4ec0\u4e48\u662fSQL\u89e6\u53d1\u5668\u4ee5\u53ca\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528\u5b83\u4eec\u5728\u63d2\u5165\u548c\u66f4\u65b0\u67e5\u8be2\u4e4b\u524d\u64cd\u4f5c\u6570\u636e\u3002\u60a8\u5b66\u4f1a\u4e86\u5982\u4f55\u4f7f\u7528<code>BEFORE DELETE<\/code>\u89e6\u53d1\u5668\u5c06\u88ab\u5220\u9664\u7684\u884c\u5b58\u6863\u5230\u4e00\u4e2a\u5355\u72ec\u7684\u8868\u4e2d\uff0c\u4ee5\u53ca\u5982\u4f55\u4f7f\u7528<code>AFTER<\/code>\u8bed\u53e5\u89e6\u53d1\u5668\u4fdd\u6301\u6458\u8981\u6570\u636e\u5b9e\u65f6\u66f4\u65b0\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u4f7f\u7528\u51fd\u6570\u5c06\u90e8\u5206\u6570\u636e\u5904\u7406\u548c\u9a8c\u8bc1\u5de5\u4f5c\u4ea4\u7ed9\u6570\u636e\u5e93\u5f15\u64ce\uff0c\u4ece\u800c\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\uff0c\u6216\u8005\u5411\u65e5\u5e38\u6570\u636e\u5e93\u7528\u6237\u9690\u85cf\u67d0\u4e9b\u6570\u636e\u5e93\u884c\u4e3a\u3002\u672c\u6559\u7a0b\u4ec5\u4ecb\u7ecd\u4e86\u4f7f\u7528\u89e6\u53d1\u5668\u5b9e\u73b0\u6b64\u76ee\u7684\u7684\u57fa\u672c\u77e5\u8bc6\u3002\u60a8\u53ef\u4ee5\u6784\u5efa\u5305\u542b\u591a\u4e2a\u8bed\u53e5\u5e76\u4f7f\u7528\u6761\u4ef6\u903b\u8f91\u6267\u884c\u66f4\u7cbe\u7ec6\u64cd\u4f5c\u7684\u590d\u6742\u89e6\u53d1\u5668\u3002\u8981\u4e86\u89e3\u66f4\u591a\u76f8\u5173\u5185\u5bb9\uff0c\u8bf7\u53c2\u8003MySQL\u5173\u4e8e\u89e6\u53d1\u5668\u7684\u5b98\u65b9\u6587\u6863\u3002<\/p>\n<p>\u5982\u679c\u60a8\u60f3\u4e86\u89e3\u66f4\u591a\u5173\u4e8eSQL\u8bed\u8a00\u53ca\u5176\u4e0d\u540c\u6982\u5ff5\u7684\u77e5\u8bc6\uff0c\u6211\u4eec\u9f13\u52b1\u60a8\u67e5\u9605\u300a\u5982\u4f55\u4f7f\u7528SQL\u7cfb\u5217\u300b\u4e2d\u7684\u5176\u4ed6\u6307\u5357\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f15\u8a00 \u5728\u5904\u7406\u5173\u7cfb\u578b\u6570\u636e\u5e93\u548c\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff08SQL\uff09\u65f6\uff0c\u5927\u591a\u6570\u6570\u636e\u64cd\u4f5c\u662f\u901a\u8fc7\u663e\u5f0f\u6267\u884c\u7684\u67e5\u8be2\u64cd\u4f5c\u6765\u5b9e\u73b0\u7684\uff0c\u4f8b\u5982SE [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[303,320,321,347,367],"class_list":["post-51","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-mysql","tag-sql","tag-321","tag-347","tag-367"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>MySQL\u89e6\u53d1\u5668\u7ec8\u6781\u6307\u5357\uff1a\u4ece\u5165\u95e8\u5230\u7cbe\u901a - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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