{"id":31334,"date":"2023-09-16T19:11:44","date_gmt":"2022-12-19T01:35:36","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e5%9f%ba%e7%a1%80%e6%80%bb%e7%bb%93%ef%bc%88%e6%95%b0%e6%8d%ae%e5%ba%93%ef%bc%89\/"},"modified":"2025-08-12T23:30:02","modified_gmt":"2025-08-12T15:30:02","slug":"java%e5%9f%ba%e7%a1%80%e6%80%bb%e7%bb%93%ef%bc%88%e6%95%b0%e6%8d%ae%e5%ba%93%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e5%9f%ba%e7%a1%80%e6%80%bb%e7%bb%93%ef%bc%88%e6%95%b0%e6%8d%ae%e5%ba%93%ef%bc%89\/","title":{"rendered":"Java\u57fa\u7840\u603b\u7ed3\uff08\u6570\u636e\u5e93\uff09"},"content":{"rendered":"<h1>\u9996\u5148\u6211\u5f00\u59cb\u5b66\u4e60Java\u3002<br \/>\n\u6211\u5c06\u4ece\u975e\u5e38\u57fa\u7840\u7684\u6c34\u5e73\u5f00\u59cb\u5199\u4f5c\u3002<br \/>\n\u6211\u4f1a\u521b\u5efa\u81ea\u5df1\u53ef\u4ee5\u590d\u4e60\u7684\u5907\u5fd8\u5f55\u3002<\/p>\n<h1>\u6570\u636e\u5e93\u8fde\u63a5\u673a\u5236<\/p>\n<h3>\u6570\u636e\u5e93 (DB)\u8fd9\u662f\u6574\u7406\u548c\u79ef\u7d2f\u6570\u636e\u7684\u4e1c\u897f\u3002\u4e5f\u79f0\u4e3a\u6570\u636e\u5e93\uff08DB\uff09\u3002<br \/>\n\u6570\u636e\u662f\u8d44\u6599\u3002\u662f\u57fa\u672c\u4e8b\u5b9e\u3002\u662f\u901a\u8fc7\u5b9e\u9a8c\u3001\u89c2\u5bdf\u3001\u8c03\u67e5\u548c\u7edf\u8ba1\u5904\u7406\u83b7\u5f97\u7684\u6570\u5b57\u4fe1\u606f\u3002<br \/>\nbase\u6709&#8221;\u57fa\u5730&#8221;\u7684\u610f\u601d\uff0c\u76f4\u8bd1\u8fc7\u6765\u5c31\u662f\u4e00\u79cd&#8221;\u4fe1\u606f\u7684\u57fa\u5730&#8221;\u7c7b\u4f3c\u7684\u4e1c\u897f\u3002<\/p>\n<p>\u80fd\u7ba1\u7406\u6570\u636e\u7684\u8f6f\u4ef6\u3002<br \/>\n\u8fd8\u6709\u5404\u79cd\u4e0d\u540c\u7c7b\u578b\u7684\u8f6f\u4ef6\uff0c\u53ef\u4ee5\u6839\u636e\u9009\u62e9\u7684\u6570\u636e\u5e93\u8fdb\u884c\u5f00\u53d1\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Oracle<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">MySQL<\/ul>\n<p>\u6709\u5404\u79cd\u5404\u6837\u7684\u6570\u636e\u5e93\u8f6f\u4ef6\u53ef\u4f9b\u9009\u62e9\u3002<\/p>\n<h3>JDBC\uff1aJava\u6570\u636e\u5e93\u8fde\u63a5\u3002Java\u6570\u636e\u5e93\u8fde\u63a5\uff08JDBC\uff09\u7684\u7f29\u5199\uff0c\u662f\u7528\u4e8e\u5c06Java\u548c\u6570\u636e\u5e93\u8fde\u63a5\u7684\u4e00\u7ec4\u7c7b\u548c\u63a5\u53e3\u6240\u8d77\u7684\u4f5c\u7528\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">JDBC API<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">API\u3068\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u3084\u30b5\u30fc\u30d3\u30b9\u306e\u6a5f\u80fd\u3092\u5916\u90e8\u304b\u3089\u4f7f\u3048\u308b\u3088\u3046\u306b\u3059\u308b\u4ed5\u7d44\u307f\u3084\u5229\u7528\u65b9\u6cd5<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">JDK\u306b\u542b\u307e\u308c\u308b\u30d1\u30c3\u30b1\u30fc\u30b8\u306a\u306e\u3067\u3001\u4e00\u822c\u7684\u306aJava\u74b0\u5883\u304c\u6574\u3063\u3066\u3044\u308c\u3070\u4f7f\u7528\u3067\u304d\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">JDBC \u30c9\u30e9\u30a4\u30d0<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u5404DB\u306e\u958b\u767a\u5143\u304c\u516c\u958b\u3057\u3066\u304f\u308c\u3066\u3044\u308b\u3002\u5404\u30b5\u30a4\u30c8\u306eDL\u30da\u30fc\u30b8\u306a\u3069\u304b\u3089\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u305f\u308a\u3059\u308b\u3002<\/ul>\n<p>\u5b83\u662f\u7531\u4e24\u4e2a\u90e8\u5206\u6784\u5efa\u800c\u6210\u7684\u3002<\/p>\n<h4>JDBC\u9a71\u52a8\u7a0b\u5e8f\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\uff1fJDBC\u9a71\u52a8\u5668\u5177\u5907\u5438\u7eb3\u5404\u4e2a\u6570\u636e\u5e93\u7684\u5dee\u5f02\u7684\u529f\u80fd\u3002<br \/>\n\u5373\u4f7f\u6bcf\u4e2a\u6570\u636e\u5e93\u7684\u5904\u7406\u65b9\u5f0f\u4e0d\u540c\uff0cJava\u7a0b\u5e8f\u4e5f\u51e0\u4e4e\u4e0d\u9700\u8981\u6539\u52a8\uff0c\u56e0\u4e3aJDBC\u9a71\u52a8\u5668\u53ef\u4ee5\u5438\u6536\u8fd9\u4e9b\u5dee\u5f02\u3002<\/p>\n<h3>SQL (Structured Query Language) \u5728\u4e2d\u56fd\u4eba\u8c03\u9999\u70ed\u8877\u4e8e\u56fa\u5316\u67e5\u8be2\u8bed\u8a00\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff08SQL\uff09\u662f\u4e00\u79cd\u7528\u4e8e\u64cd\u4f5c\u6570\u636e\u5e93\u7684\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\u3002<\/p>\n<h1>\u6d41\u52a8<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>DB\u548cJDBC\u9a71\u52a8\u7684\u5b89\u88c5<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>SQL\u64cd\u4f5c<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>JDBC\u7f16\u7a0b<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>Web\u5e94\u7528\u7a0b\u5e8f\u96c6\u6210<\/ol>\n<p>\u6309\u7167\u4ee5\u4e0b\u987a\u5e8f\u8fdb\u884c<\/p>\n<h1>\u4e8b\u524d\u51c6\u5907\uff08\u5b89\u88c5DB\u548cJDBC\u9a71\u52a8\u7a0b\u5e8f\uff09\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u4f7f\u7528MySQL\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<h3>MySQL\u7684\u5b89\u88c5MySQL\u662f\u4e00\u79cd\u5e38\u7528\u7684\u5f00\u6e90\u6570\u636e\u6e90\uff08OSS\uff09\u7684\u6570\u636e\u5e93\u3002<br \/>\nOSS\u662fOpen Source Software\u7684\u7f29\u5199\uff0c\u5176\u6e90\u4ee3\u7801\u662f\u516c\u5f00\u7684\uff0c<br \/>\n\u53ef\u4ee5\u514d\u8d39\u4f7f\u7528\u3001\u4fee\u6539\u548c\u518d\u5206\u53d1\u7684\u8f6f\u4ef6\u3002<\/p>\n<p>\u672c\u6b21\u6211\u4eec\u5c06\u4f7f\u7528MySQL Community Server\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u8bf7\u53c2\u8003\u4e0b\u9762\u7684YouTube\u89c6\u9891\u6765\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u9700\u8981\u8bbe\u7f6e\u7ba1\u7406\u8005\u8d26\u6237\u201croot\u201d\u7684\u5bc6\u7801\u3002<\/p>\n<h3>\u5728\u4e2d\u56fd\uff0c\u53ea\u9700\u8981\u4e00\u79cd\u4e2d\u6587\u9009\u9879\u7684\u8bdd\uff0c\u53ef\u4ee5\u5c06\u4ee5\u4e0b\u53e5\u5b50\u91ca\u4e49\u4e3a\uff1a<br \/>\n\u4e0b\u8f7dJDBC\u9a71\u52a8\u7a0b\u5e8f\u53ea\u9700\u4e0b\u8f7d\u3002\u53ea\u662f\u6709\u70b9\u96be\u4ee5\u7406\u89e3\u5e94\u8be5\u4e0b\u8f7d\u54ea\u4e00\u4e2a\u3002<\/p>\n<p>\u8bf7\u53c2\u8003\u4e0b\u65b9\u7684Youtube\u89c6\u9891\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<p>&nbsp;<\/p>\n<h3>\u8bbe\u5b9a\u73af\u5883\u53d8\u91cf\u9700\u8981\u975e\u5e38\u5c0f\u5fc3\u5730\u8fdb\u884c\u64cd\u4f5c\u3002\u5982\u679c\u8bbe\u7f6e\u9519\u8bef\u53ef\u80fd\u4f1a\u5f71\u54cd\u5176\u4ed6\u7a0b\u5e8f\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">PATH\u306e\u8a2d\u5b9a<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">MySQL\u5185\u306ebin\u30d5\u30a9\u30eb\u30c0\u306e\u5834\u6240\u3092\u6307\u5b9a\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">CLASSPATH\u306e\u8a2d\u5b9a<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">JDBC\u30c9\u30e9\u30a4\u30d0\u30fc\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u6307\u5b9a\u3059\u308b<\/ul>\n<h3>\u5176\u4ed6\u672f\u8bed\u7b49<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">JAR\u30d5\u30a1\u30a4\u30eb(Java ARchive)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30af\u30e9\u30b9\u30d5\u30a1\u30a4\u30eb\u306a\u3069\u3092\u5727\u7e2e\u3057\u3066\u307e\u3068\u3081\u305f\u30d5\u30a1\u30a4\u30eb<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u300c\uff5e.jar\u300d<\/ul>\n<h1>SQL\u662f\u4ec0\u4e48\uff1fSQL\u662f\u64cd\u4f5c\u5173\u7cfb\u6570\u636e\u5e93\uff08RDB\uff09\u7684\u6807\u51c6\u8bed\u8a00\uff0c\u4e5f\u662f\u6700\u5e38\u7528\u7684\u6570\u636e\u5e93\u64cd\u4f5c\u8bed\u8a00\u3002<br \/>\n\u6362\u53e5\u8bdd\u8bf4\uff0c\u64cd\u4f5c\u6570\u636e\u5e93\u7684\u8bed\u8a00\u4e0d\u4ec5\u4ec5\u662fSQL\u3002<br \/>\n\u8fd8\u6709XQuery\/OQL\/GraphQL\/LINQ\u7b49\u7b49\u3002<\/p>\n<h1>SQL\u7684\u57fa\u7840\u5165\u95e8\u5f00\u59cb\u6df1\u5165\u7814\u7a76SQL\u7684\u5b9e\u9645\u64cd\u4f5c\u3002<\/p>\n<p>\u9996\u5148\uff0c\u5728SQL\u4e2d\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u3002<br \/>\n\u4f7f\u7528\u5927\u5199\u6216\u5c0f\u5199\u53d6\u51b3\u4e8e\u5177\u4f53\u573a\u666f\u3002<\/p>\n<p>\u5728\u6570\u636e\u5e93\u4e2d\uff0c\u6709\u4e00\u79cd\u79f0\u4e3a\u201c\u8868\u201d\u7684\u7ec6\u5206\u5206\u7c7b\u3002<br \/>\n\u5b83\u7c7b\u4f3c\u4e8eExcel\u7684\u8868\u683c\uff0c\u7528\u4e8e\u6574\u7406\u4fe1\u606f\u3002<br \/>\n\u7eb5\u8f74\u88ab\u79f0\u4e3a\u201c\u5217\u201d\uff0c\u6a2a\u8f74\u88ab\u79f0\u4e3a\u201c\u884c\u201d\u3002<br \/>\n\u6709\u65f6\u4e5f\u5c06\u4e00\u884c\u7684\u6570\u636e\u79f0\u4e3a\u201c\u8bb0\u5f55\u201d\u3002<\/p>\n<h3>\u6570\u636e\u5b9a\u4e49\u8bed\u8a00(DDL)\u80fd\u591f\u8fdb\u884c\u6570\u636e\u5e93\u548c\u8868\u7684\u521b\u5efa\u548c\u4fee\u6539\u7684\u8bed\u8a00\u3002<\/p>\n<p>\u521b\u5efa<br \/>\n\u4fee\u6539<br \/>\n\u5220\u9664\u7b49<\/p>\n<h3>\u6570\u636e\u64cd\u4f5c\u8bed\u8a00(DML) \u203b\u7279\u522b\u5e38\u7528\u5bf9\u6570\u636e\u8868\u683c\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u64cd\u4f5c\u7684\u7f16\u7a0b\u8bed\u8a00\u3002\u8fd9\u662f\u6700\u5e38\u7528\u7684\u4e00\u79cd\u3002<\/p>\n<p>\u67e5\u8be2\uff08\u53d6\u5f97\uff09<br \/>\n\u63d2\u5165\uff08\u633f\u5165\uff09<br \/>\n\u66f4\u65b0\uff08\u66f4\u65b0\uff09<br \/>\n\u5220\u9664\uff08\u524a\u9664\uff09\u7b49<\/p>\n<p>\u4f8b\u5982\uff0c\u83b7\u53d6\u767b\u5f55\u4fe1\u606f\u548c\u8fdb\u884c\u4f1a\u5458\u6ce8\u518c\u7b49\u64cd\u4f5c\u53ef\u4ee5\u4f7f\u7528 DML\uff08\u6570\u636e\u64cd\u4f5c\u8bed\u8a00\uff09\u6765\u5411\u8868\u4e2d\u6dfb\u52a0\u8bb0\u5f55\u3002<\/p>\n<h3>\u6570\u636e\u63a7\u5236\u8bed\u8a00(DCL)\u54ea\u4e2a\u7528\u6237\u53ef\u4ee5\u8bbf\u95ee\u54ea\u4e2a\u8868\u683c\uff1f\u8fd9\u79cd\u8bed\u8a00\u7528\u4e8e\u6743\u9650\u7ba1\u7406\u3002<\/p>\n<p>\u6388\u6743 (Grant)<br \/>\n\u53d6\u6d88\u6388\u6743 (Revoke)<\/p>\n<h1>\u6211\u7b2c\u4e00\u6b21\u5c1d\u8bd5\u8fdb\u884cSQL\u64cd\u4f5c\u4ece\u5b9e\u9645\u7684\u7b80\u5355\u64cd\u4f5c\u6b65\u9aa4\u5f00\u59cb\u6267\u884c\u3002<\/p>\n<h3>\u521b\u5efa\u6570\u636e\u5e93\u8868<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">CREATE<\/span> <span class=\"k\">DATABASE<\/span> <span class=\"err\">\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u540d\u524d<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">CREATE<\/span> <span class=\"k\">TABLE<\/span> <span class=\"err\">\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u540d<\/span><span class=\"p\">.<\/span><span class=\"err\">\u8868\u540d<\/span><span class=\"p\">(<\/span><span class=\"err\">\u5217\u540d<\/span> <span class=\"err\">\u30c7\u30fc\u30bf\u578b<\/span><span class=\"p\">,<\/span><span class=\"o\">~<\/span><span class=\"p\">);<\/span>\r\n\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u4f8b<\/span>\r\n<span class=\"k\">CREATE<\/span> <span class=\"k\">TABLE<\/span> <span class=\"n\">sampledb<\/span><span class=\"p\">.<\/span><span class=\"n\">student<\/span><span class=\"p\">(<\/span><span class=\"k\">no<\/span> <span class=\"nb\">int<\/span> <span class=\"k\">PRIMARY<\/span> <span class=\"k\">KEY<\/span><span class=\"p\">,<\/span><span class=\"n\">name<\/span> <span class=\"nb\">varchar<\/span><span class=\"p\">(<\/span><span class=\"mi\">10<\/span><span class=\"p\">),<\/span><span class=\"n\">score<\/span> <span class=\"nb\">int<\/span><span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u7531\u4e8eMySQL\u7684\u6570\u636e\u7c7b\u578b\u4e0eJava\u7684\u611f\u89c9\u6709\u70b9\u4e0d\u540c\uff0c\u6240\u4ee5\u5728\u8fdb\u884c\u6ce8\u518c\u65f6\u6700\u597d\u8fdb\u884c\u4e00\u4e9b\u8c03\u67e5\u3002<\/p>\n<p>\u901a\u8fc7\u5728\u6570\u636e\u7c7b\u578b\u540e\u9762\u52a0\u4e0a\u300cPRIMARY KEY\u300d\uff0c\u4fdd\u8bc1\u6570\u636e\u7684\u552f\u4e00\u6027\u3002\u800c\u6570\u636e\u7684\u552f\u4e00\u6027\u610f\u5473\u7740\u4e0d\u80fd\u6ce8\u518c\u76f8\u540c\u7684\u6570\u636e\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u4f1a\u5458\u7f16\u53f7\u5c31\u662f\u4e00\u4e2a\u4f8b\u5b50\u3002<\/p>\n<h3>\u67e5\u770b\u6570\u636e\u5e93\u548c\u8868\u7684\u65b9\u6cd5\u5728\u547d\u4ee4\u63d0\u793a\u7b26\u4e2d\u542f\u52a8MySQL\u540e\u4ecb\u7ecd\u5728SQL\u4e2d\u6267\u884c\u7684\u547d\u4ee4\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">show<\/span> <span class=\"n\">databases<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">show<\/span> <span class=\"n\">tables<\/span> <span class=\"k\">in<\/span> <span class=\"err\">\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u540d<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">desc<\/span> <span class=\"err\">\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u540d<\/span><span class=\"p\">.<\/span><span class=\"err\">\u30c6\u30fc\u30d6\u30eb\u540d<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<h3>\u5728\u8fdb\u884c\u8868\u64cd\u4f5c\u4e4b\u524d<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">use<\/span> <span class=\"err\">\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u540d<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u3053\u308c\u304b\u3089\u89e6\u308b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u3057\u3066\u304b\u3089\u4f5c\u696d\u30b9\u30bf\u30fc\u30c8\u3059\u308b\u3088\u3046\u306b\u3002<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">source<\/span> <span class=\"o\">~<\/span><span class=\"p\">.<\/span><span class=\"k\">sql<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<p>\u4e3b\u8981\u662f\u4f7f\u7528\u547d\u4ee4\u64cd\u4f5c\uff0c\u4f46\u662f\u53ef\u4ee5\u901a\u8fc7\u5c06\u547d\u4ee4\u6c47\u603b\u5230SQL\u6587\u4ef6\u4e2d\u6765\u4e00\u6b21\u6027\u6267\u884cSQL\u6587\u4ef6\u4e2d\u7684\u547d\u4ee4\u3002<br \/>\n\u6240\u6709\u5728\u300c~.sql\u300d\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\u5c06\u88ab\u8bfb\u53d6\u5e76\u6267\u884c\u547d\u4ee4\u3002<\/p>\n<h3>\u5728SQL\u4e2d\u8fdb\u884c\u6570\u636e\u64cd\u4f5c\uff08SELECT\u8bed\u53e5\uff09\u3002\u5f53\u9700\u8981\u83b7\u53d6\u8868\u683c\u5185\u7684\u6570\u636e\u65f6\u4f7f\u7528<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"err\">\u5217\u540d<\/span> <span class=\"k\">FROM<\/span> <span class=\"err\">\u8868\u540d<\/span><span class=\"p\">;<\/span>\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u5217\u540d\u306f\u300c<\/span><span class=\"p\">,<\/span><span class=\"err\">\u300d\u3067\u533a\u5207\u3063\u3066\u8907\u6570\u6307\u5b9a\u53ef\u80fd<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">student<\/span><span class=\"p\">;<\/span>\r\n<span class=\"o\">\/\/<\/span><span class=\"n\">student<\/span><span class=\"err\">\u30c6\u30fc\u30d6\u30eb\u306e\u60c5\u5831\u3092\u3059\u3079\u3066\u53d6\u5f97<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"k\">no<\/span> <span class=\"p\">,<\/span> <span class=\"n\">score<\/span><span class=\"o\">*<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">5<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">student<\/span>\r\n<span class=\"o\">\/\/<\/span><span class=\"n\">student<\/span><span class=\"err\">\u30c6\u30fc\u30d6\u30eb\u306e\u4e2d\u306e\u300c<\/span><span class=\"k\">no<\/span><span class=\"err\">\u300d\u884c\u3068\u300c<\/span><span class=\"n\">score<\/span><span class=\"err\">\u300d\u884c\u306b<\/span><span class=\"mi\">0<\/span><span class=\"p\">.<\/span><span class=\"mi\">5<\/span><span class=\"err\">\u306e\u639b\u3051\u7b97\u3092\u3057\u305f\u5024\u3092\u51fa\u529b<\/span>\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u3053\u3053\u3067\u306e<\/span><span class=\"o\">*<\/span><span class=\"err\">\u306f\u6570\u5024\u306b\u631f\u307e\u308c\u3066\u3044\u308b\u306e\u3067\u8a08\u7b97\u5f0f\u3068\u3057\u3066\u6271\u308f\u308c\u308b\u3002<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"err\">\u5217\u540d\u304b<\/span><span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"err\">\u30c6\u30fc\u30d6\u30eb\u540d<\/span> <span class=\"k\">ORDER<\/span> <span class=\"k\">BY<\/span> <span class=\"err\">\u5bfe\u8c61\u306e\u5217\u540d<\/span> <span class=\"k\">ASC<\/span><span class=\"err\">\u304b<\/span><span class=\"k\">DESC<\/span><span class=\"p\">;<\/span>\r\n<span class=\"o\">\/\/<\/span><span class=\"k\">ASC<\/span><span class=\"err\">\u304b\u6607\u9806\u3001<\/span><span class=\"k\">DESC<\/span><span class=\"err\">\u304c\u964d\u9806<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"err\">\u5217\u540d\u304b<\/span><span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"err\">\u30c6\u30fc\u30d6\u30eb\u540d<\/span> <span class=\"k\">LIMIT<\/span> <span class=\"err\">\u4ef6\u6570<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"err\">\u5217\u540d\u304b<\/span><span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"err\">\u30c6\u30fc\u30d6\u30eb\u540d<\/span> <span class=\"k\">WHERE<\/span> <span class=\"err\">\u5217\u540d<\/span> <span class=\"k\">IS<\/span> <span class=\"k\">NULL<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">SELECT<\/span> <span class=\"err\">\u5217\u540d\u304b<\/span><span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"err\">\u30c6\u30fc\u30d6\u30eb\u540d<\/span> <span class=\"k\">WHERE<\/span> <span class=\"err\">\u5217\u540d<\/span> <span class=\"k\">IS<\/span> <span class=\"k\">NOT<\/span> <span class=\"k\">NULL<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">SELECT<\/span> <span class=\"err\">\u5217\u540d\u304b<\/span><span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"err\">\u30c6\u30fc\u30d6\u30eb\u540d<\/span> <span class=\"k\">WHERE<\/span> <span class=\"err\">\u5217\u540d<\/span> <span class=\"o\">&gt;=<\/span> <span class=\"mi\">10<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">SELECT<\/span> <span class=\"err\">\u5217\u540d\u304b<\/span><span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"err\">\u30c6\u30fc\u30d6\u30eb\u540d<\/span> <span class=\"k\">WHERE<\/span> <span class=\"err\">\u5217\u540d<\/span> <span class=\"k\">IN<\/span> <span class=\"p\">(<\/span><span class=\"n\">A<\/span><span class=\"p\">,<\/span><span class=\"n\">B<\/span><span class=\"p\">);<\/span>\r\n<span class=\"k\">SELECT<\/span> <span class=\"err\">\u5217\u540d\u304b<\/span><span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"err\">\u30c6\u30fc\u30d6\u30eb\u540d<\/span> <span class=\"k\">WHERE<\/span> <span class=\"err\">\u5217\u540d<\/span> <span class=\"k\">LIKE<\/span> <span class=\"s1\">'\u691c\u7d22\u6587\u5b57%'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">SELECT<\/span> <span class=\"err\">\u5217\u540d\u304b<\/span><span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"err\">\u30c6\u30fc\u30d6\u30eb\u540d<\/span> <span class=\"k\">WHERE<\/span> <span class=\"err\">\u5217\u540d<\/span> <span class=\"k\">LIKE<\/span> <span class=\"s1\">'%\u691c\u7d22\u6587\u5b57'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">SELECT<\/span> <span class=\"err\">\u5217\u540d\u304b<\/span><span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"err\">\u30c6\u30fc\u30d6\u30eb\u540d<\/span> <span class=\"k\">WHERE<\/span> <span class=\"err\">\u5217\u540d<\/span> <span class=\"k\">LIKE<\/span> <span class=\"s1\">'%\u691c\u7d22\u6587\u5b57%'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">SELECT<\/span> <span class=\"err\">\u5217\u540d\u304b<\/span><span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"err\">\u30c6\u30fc\u30d6\u30eb\u540d<\/span> <span class=\"k\">WHERE<\/span> <span class=\"err\">\u5217\u540d<\/span> <span class=\"k\">LIKE<\/span> <span class=\"s1\">'\u691c\u7d22\u6587\u5b57%'<\/span> <span class=\"k\">AND<\/span> <span class=\"err\">\u5217\u540d<\/span> <span class=\"k\">LIKE<\/span> <span class=\"s1\">'%\u691c\u7d22\u6587\u5b57%'<\/span><span class=\"p\">;<\/span>\r\n\r\n\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u6bd4\u8f03\u6f14\u7b97\u5b50\u3084\u4e2d\u8eab\u306b\u30c7\u30fc\u30bf\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u306a\u3069\u6307\u5b9a\u3067\u304d\u308b<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">select<\/span> <span class=\"n\">player<\/span> <span class=\"k\">from<\/span> <span class=\"n\">game<\/span> <span class=\"k\">as<\/span> <span class=\"n\">gm<\/span> <span class=\"k\">join<\/span> <span class=\"n\">goal<\/span> <span class=\"k\">as<\/span> <span class=\"k\">go<\/span> <span class=\"k\">on<\/span> <span class=\"n\">gm<\/span><span class=\"p\">.<\/span><span class=\"n\">id<\/span><span class=\"o\">=<\/span><span class=\"k\">go<\/span><span class=\"p\">.<\/span><span class=\"n\">matchid<\/span>\r\n<span class=\"k\">where<\/span> <span class=\"n\">stadium<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'National Stadium, Warsaw'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"o\">\/\/<\/span><span class=\"k\">as<\/span><span class=\"err\">\u306f\u30c6\u30fc\u30d6\u30eb\u540d\u306e\u5225\u540d\u3092\u8a2d\u5b9a<\/span><span class=\"p\">(<\/span><span class=\"err\">\u7701\u7565\u3082\u3067\u304d\u308b<\/span><span class=\"p\">)<\/span><span class=\"err\">\u3001<\/span><span class=\"k\">join<\/span><span class=\"err\">\u306f\u95a2\u9023\u3059\u308b\u30c6\u30fc\u30d6\u30eb\u306e\u8ffd\u52a0<\/span><span class=\"k\">on<\/span><span class=\"err\">\u4ee5\u4e0b\u3067\u5171\u901a\u9805\u306e\u8a2d\u5b9a\u3092\u3059\u308b\u3002<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"n\">title<\/span><span class=\"p\">,<\/span> <span class=\"n\">name<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">movie<\/span> <span class=\"n\">m<\/span> \r\n<span class=\"k\">JOIN<\/span> <span class=\"n\">casting<\/span> <span class=\"k\">c<\/span> <span class=\"k\">ON<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">id<\/span><span class=\"o\">=<\/span><span class=\"k\">c<\/span><span class=\"p\">.<\/span><span class=\"n\">movieid<\/span>\r\n<span class=\"k\">JOIN<\/span> <span class=\"n\">actor<\/span> <span class=\"n\">a<\/span> <span class=\"k\">ON<\/span> <span class=\"n\">a<\/span><span class=\"p\">.<\/span><span class=\"n\">id<\/span><span class=\"o\">=<\/span><span class=\"k\">c<\/span><span class=\"p\">.<\/span><span class=\"n\">actorid<\/span>\r\n\r\n<span class=\"k\">WHERE<\/span> \r\n<span class=\"n\">yr<\/span><span class=\"o\">=<\/span><span class=\"mi\">1962<\/span>\r\n<span class=\"k\">AND<\/span>\r\n<span class=\"n\">ord<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">1<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">select<\/span><span class=\"err\">\u3000<\/span><span class=\"n\">title<\/span><span class=\"p\">,<\/span> <span class=\"n\">name<\/span>\r\n<span class=\"k\">from<\/span><span class=\"err\">\u3000<\/span><span class=\"n\">movie<\/span> <span class=\"n\">m<\/span><span class=\"p\">,<\/span> <span class=\"n\">casting<\/span> <span class=\"k\">c<\/span><span class=\"p\">,<\/span> <span class=\"n\">actor<\/span> <span class=\"n\">a<\/span>\r\n<span class=\"k\">where<\/span>\r\n <span class=\"k\">c<\/span><span class=\"p\">.<\/span><span class=\"n\">movieid<\/span><span class=\"o\">=<\/span><span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">id<\/span>\r\n <span class=\"k\">and<\/span> <span class=\"k\">c<\/span><span class=\"p\">.<\/span><span class=\"n\">actorid<\/span><span class=\"o\">=<\/span><span class=\"n\">a<\/span><span class=\"p\">.<\/span><span class=\"n\">id<\/span>\r\n <span class=\"k\">and<\/span> <span class=\"n\">ord<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span>\r\n <span class=\"k\">and<\/span> <span class=\"n\">movieid<\/span> <span class=\"k\">in<\/span> \r\n <span class=\"p\">(<\/span><span class=\"k\">select<\/span> <span class=\"n\">movieid<\/span>\r\n<span class=\"k\">from<\/span> <span class=\"n\">casting<\/span><span class=\"p\">,<\/span> <span class=\"n\">actor<\/span>\r\n<span class=\"k\">where<\/span> <span class=\"n\">actorid<\/span><span class=\"o\">=<\/span><span class=\"n\">actor<\/span><span class=\"p\">.<\/span><span class=\"n\">id<\/span>\r\n<span class=\"k\">and<\/span> <span class=\"n\">name<\/span><span class=\"o\">=<\/span><span class=\"s1\">'Julie Andrews'<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"k\">distinct<\/span><span class=\"p\">(<\/span><span class=\"n\">player<\/span><span class=\"p\">)<\/span>\r\n<span class=\"k\">FROM<\/span> <span class=\"n\">game<\/span> <span class=\"n\">ga<\/span> <span class=\"k\">JOIN<\/span> <span class=\"n\">goal<\/span> <span class=\"k\">go<\/span> <span class=\"k\">ON<\/span> <span class=\"k\">go<\/span><span class=\"p\">.<\/span><span class=\"n\">matchid<\/span> <span class=\"o\">=<\/span> <span class=\"n\">ga<\/span><span class=\"p\">.<\/span><span class=\"n\">id<\/span> \r\n<span class=\"k\">WHERE<\/span> <span class=\"p\">(<\/span><span class=\"n\">team1<\/span><span class=\"o\">=<\/span><span class=\"s1\">'GER'<\/span> <span class=\"k\">or<\/span> <span class=\"n\">team2<\/span><span class=\"o\">=<\/span><span class=\"s1\">'GRE'<\/span><span class=\"p\">)<\/span><span class=\"k\">AND<\/span> <span class=\"n\">teamid<\/span> <span class=\"o\">&lt;&gt;<\/span> <span class=\"s1\">'GRE'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u540c\u3058\u8981\u4ef6\u304c\u8907\u6570\u91cd\u8907\u3057\u3066\u3044\u308b\u5834\u5408<\/span><span class=\"n\">disinct<\/span><span class=\"err\">\u3067\u91cd\u8907\u5206\u3092\u307e\u3068\u3081\u3066\u304f\u308c\u308b<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"n\">name<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">teacher<\/span>\r\n<span class=\"k\">WHERE<\/span> <span class=\"n\">dept<\/span> <span class=\"k\">IS<\/span> <span class=\"k\">NULL<\/span><span class=\"p\">;<\/span> \r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"n\">name<\/span><span class=\"p\">,<\/span><span class=\"n\">COALESCE<\/span><span class=\"p\">(<\/span><span class=\"n\">mobile<\/span><span class=\"p\">,<\/span><span class=\"s1\">'\u672a\u767b\u9332'<\/span><span class=\"p\">)<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">teacher<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">select<\/span>\r\n <span class=\"n\">name<\/span><span class=\"p\">,<\/span>\r\n<span class=\"k\">case<\/span> <span class=\"k\">when<\/span> <span class=\"n\">dept<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span> <span class=\"k\">then<\/span> <span class=\"s1\">'Sci'<\/span>\r\n<span class=\"k\">when<\/span> <span class=\"n\">dept<\/span><span class=\"o\">=<\/span><span class=\"mi\">2<\/span> <span class=\"k\">then<\/span> <span class=\"s1\">'Sci'<\/span> \r\n<span class=\"k\">else<\/span> <span class=\"s1\">'Art'<\/span> <span class=\"k\">end<\/span>\r\n<span class=\"k\">from<\/span>\r\n <span class=\"n\">teacher<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<p>\u25bc\u52a0\u5165\u7684\u4f7f\u7528\u65b9\u6cd5<\/p>\n<p>&nbsp;<\/p>\n<p>\u25bc\u5982\u4f55\u4f7f\u7528GROUP BY<\/p>\n<p>&nbsp;<\/p>\n<h3>\u4f7f\u7528SQL\u8fdb\u884c\u6570\u636e\u64cd\u4f5c\uff08\u63d2\u5165\u8bed\u53e5\uff09\u3002<br \/>\n\u5f53\u6211\u4eec\u60f3\u8981\u63d2\u5165\u8868\u5185\u7684\u6570\u636e\u65f6\u4f7f\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">INSERT<\/span> <span class=\"k\">INTO<\/span> <span class=\"err\">\u8868\u540d<\/span><span class=\"p\">(<\/span><span class=\"err\">\u5217\u540d<\/span><span class=\"p\">:<\/span><span class=\"err\">\u7701\u7565\u53ef<\/span><span class=\"p\">)<\/span> <span class=\"k\">VALUES<\/span><span class=\"p\">(<\/span><span class=\"err\">\u633f\u5165\u3057\u305f\u3044\u5024<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u4f8b<\/span>\r\n<span class=\"k\">INSERT<\/span> <span class=\"k\">INTO<\/span> <span class=\"n\">student<\/span> <span class=\"k\">VALUES<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span><span class=\"s1\">'\u5c71\u7530'<\/span><span class=\"p\">,<\/span><span class=\"mi\">80<\/span><span class=\"p\">);<\/span>\r\n<span class=\"err\">\u300c<\/span><span class=\"s1\">''<\/span><span class=\"err\">\u300d\u3067\u56f2\u3063\u305f\u3082\u306e\u306f\u6587\u5b57\u5217\u3067\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u308b\u3002<\/span>\r\n\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u4f8b<\/span><span class=\"mi\">2<\/span>\r\n<span class=\"k\">INSERT<\/span> <span class=\"k\">INTO<\/span> <span class=\"n\">student<\/span><span class=\"p\">(<\/span><span class=\"k\">no<\/span><span class=\"p\">,<\/span><span class=\"n\">name<\/span><span class=\"p\">)<\/span> <span class=\"k\">VALUES<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span><span class=\"s1\">'\u5c71\u7530'<\/span><span class=\"p\">);<\/span>\r\n<span class=\"err\">\u5217\u3092\u6307\u5b9a\u3057\u3066\u633f\u5165\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b<\/span>\r\n<\/code><\/pre>\n<h3>\u5728SQL\u4e2d\u8fdb\u884c\u6570\u636e\u64cd\u4f5c\uff08\u66f4\u65b0\u8bed\u53e5\uff09\u3002\u5728\u60f3\u8981\u66f4\u65b0\u8868\u5185\u6570\u636e\u65f6\u4f7f\u7528<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">UPDATE<\/span> <span class=\"err\">\u8868\u540d<\/span> <span class=\"k\">SET<\/span> <span class=\"err\">\u5217\u540d<\/span> <span class=\"o\">=<\/span> <span class=\"err\">\u5217\u5024<\/span><span class=\"p\">;<\/span>\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u5217\u540d<\/span> <span class=\"o\">=<\/span> <span class=\"err\">\u5217\u5024\u306f\u300c<\/span><span class=\"p\">,<\/span><span class=\"err\">\u300d\u3067\u8907\u6570\u8a18\u8ff0\u3067\u304d\u308b<\/span>\r\n\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u4f8b<\/span>\r\n<span class=\"k\">UPDATE<\/span> <span class=\"n\">student<\/span> <span class=\"k\">SET<\/span> <span class=\"n\">score<\/span> <span class=\"o\">=<\/span> <span class=\"n\">score<\/span><span class=\"o\">+<\/span><span class=\"mi\">5<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<h3>\u7528SQL\u8fdb\u884c\u6570\u636e\u64cd\u4f5c\uff08\u5220\u9664\u6307\u4ee4\uff09\u60a8\u53ef\u4ee5\u5220\u9664\u8868\u4e2d\u7684\u6570\u636e\u3002 de .)<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">DELETE<\/span> <span class=\"k\">FROM<\/span> <span class=\"err\">\u8868\u540d<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u4f8b<\/span>\r\n<span class=\"k\">DELETE<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">student<\/span>\r\n<span class=\"n\">student<\/span><span class=\"err\">\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u3092\u3059\u3079\u3066\u524a\u9664<\/span>\r\n<\/code><\/pre>\n<h3>\u7528SQL\u8fdb\u884c\u6761\u4ef6\u7b5b\u9009(\u9009\u62e9\u8bed\u53e5)\u901a\u8fc7\u4f7f\u7528&#8221;WHERE\u5b50\u53e5&#8221;\uff0c\u53ef\u4ee5\u5728SELECT\u8bed\u53e5\/UPDATE\u8bed\u53e5\/DELETE\u8bed\u53e5\u4e2d\u6307\u5b9a\u6761\u4ef6\u3002<br \/>\n\u800c\u5728\u8fdb\u884c\u6761\u4ef6\u6307\u5b9a\u65f6\uff0c\u8fd8\u5fc5\u987b\u5177\u5907\u64cd\u4f5c\u7b26\u7684\u77e5\u8bc6\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u95a2\u4fc2\u6f14\u7b97\u5b50 &gt;,&gt;=,&lt;,&lt;=,=,&lt;&gt;<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">(=\u306fjava\u306e==\u3068\u540c\u7fa9\u3001&lt;&gt;\u306fjava\u306e!=\u3068\u540c\u7fa9)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u8ad6\u7406\u6f14\u7b97\u5b50 AND,OR,NOT<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u7279\u6b8a\u6f14\u7b97\u5b50 BETWEEN,LIKE<\/ul>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"p\">{<\/span><span class=\"o\">*<\/span><span class=\"mi\">1<\/span><span class=\"err\">\u5217\u540d<\/span><span class=\"p\">}<\/span> <span class=\"k\">FROM<\/span> <span class=\"err\">\u8868\u540d<\/span><span class=\"p\">[<\/span><span class=\"k\">WHERE<\/span> <span class=\"err\">\u53d6\u5f97\u6761\u4ef6<\/span><span class=\"p\">]<\/span>\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u5217\u540d\u306f\u300c<\/span><span class=\"p\">,<\/span><span class=\"err\">\u300d\u3067\u8907\u6570\u6307\u5b9a\u53ef<\/span>\r\n\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u4f8b<\/span><span class=\"mi\">1<\/span>\r\n<span class=\"k\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">student<\/span> <span class=\"k\">WHERE<\/span> <span class=\"mi\">50<\/span><span class=\"o\">&lt;=<\/span><span class=\"n\">score<\/span> <span class=\"k\">AND<\/span> <span class=\"n\">score<\/span><span class=\"o\">&lt;=<\/span><span class=\"mi\">80<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u4f8b<\/span><span class=\"mi\">2<\/span>\r\n<span class=\"k\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">student<\/span> <span class=\"k\">WHERE<\/span> <span class=\"n\">score<\/span> <span class=\"k\">BETWEEN<\/span> <span class=\"mi\">50<\/span> <span class=\"k\">AND<\/span> <span class=\"mi\">80<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u4f8b<\/span><span class=\"mi\">3<\/span>\r\n<span class=\"k\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">student<\/span> <span class=\"k\">WHERE<\/span> <span class=\"n\">name<\/span> <span class=\"k\">LIKE<\/span> <span class=\"s1\">'%\u539f'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"o\">%<\/span><span class=\"err\">\u306f<\/span><span class=\"mi\">0<\/span><span class=\"err\">\u6587\u5b57\u4ee5\u4e0a\u306e\u4efb\u610f\u306e\u6587\u5b57\u5217\u3002\u300c\uff5e\u539f\u300d\u3092\u629c\u304d\u51fa\u3059\u3002\u300c\u539f\u300d\u3082<\/span><span class=\"n\">OK<\/span><span class=\"err\">\u3002<\/span>\r\n<\/code><\/pre>\n<h3>\u4f7f\u7528SQL\u8fdb\u884c\u6761\u4ef6\u6307\u5b9a\uff08UPDATE\u8bed\u53e5\uff09<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">UPDATE<\/span> <span class=\"err\">\u8868\u540d<\/span> <span class=\"k\">SET<\/span> <span class=\"err\">\u5217\u540d<\/span><span class=\"o\">=<\/span><span class=\"err\">\u5024<\/span> <span class=\"k\">WHERE<\/span> <span class=\"err\">\u66f4\u65b0\u6761\u4ef6<\/span>\r\n\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u4f8b<\/span>\r\n<span class=\"k\">UPDATE<\/span> <span class=\"n\">student<\/span> <span class=\"k\">SET<\/span> <span class=\"n\">score<\/span><span class=\"o\">=<\/span><span class=\"n\">score<\/span><span class=\"o\">+<\/span><span class=\"mi\">5<\/span> <span class=\"k\">WHERE<\/span> <span class=\"k\">no<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<h3>\u4f7f\u7528SQL\u65f6\u5bf9\u6761\u4ef6\u8fdb\u884c\u6307\u5b9a\uff08DELETE\u8bed\u53e5\uff09<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">DELETE<\/span> <span class=\"k\">FROM<\/span> <span class=\"err\">\u8868\u540d<\/span> <span class=\"k\">WHERE<\/span> <span class=\"err\">\u66f4\u65b0\u6761\u4ef6<\/span>\r\n\r\n<span class=\"o\">\/\/<\/span><span class=\"err\">\u4f8b<\/span>\r\n<span class=\"k\">DELETE<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">student<\/span> <span class=\"k\">WHERE<\/span> <span class=\"k\">no<\/span><span class=\"o\">=<\/span><span class=\"mi\">1<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<h1>\u5173\u4e8eJDBC\u5f53\u6d89\u53ca\u4f7f\u7528Java\u64cd\u4f5c\u6570\u636e\u5e93\u65f6\uff0c\u7531\u4e8e\u5176\u8d85\u91cd\u8981\u6027\uff0c\u9700\u8981\u8be6\u7ec6\u63cf\u8ff0\u3002<\/p>\n<h3>\u5728\u5904\u7406JDBC\u4e4b\u524d\u5fc5\u987b\u5c06JDBC\u9a71\u52a8\u7a0b\u5e8f\u8bbe\u7f6e\u5728\u73af\u5883\u53d8\u91cfCLASSPATH\u4e2d\u3002<\/p>\n<h2>JDBC\u66f4\u65b0\u5904\u7406\u7a0b\u5e8f\u7684\u6d41\u7a0b<\/p>\n<h3>\u5c06\u8fde\u63a5\u5230\u6570\u636e\u5e93\u3002\u5904\u7406DriverManager\u7c7b\u3002<br \/>\nDriverManager\u7c7b\u662f\u7528\u6765\u7ba1\u7406JDBC\u9a71\u52a8\u7a0b\u5e8f\u7684\u7c7b\u3002<br \/>\n\u53ef\u4ee5\u4f7f\u7528getConnection\u65b9\u6cd5\u6765\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code>Connection con = Driver.Manager.getConnection(JDBCURL,username,pass);\r\n\r\n\/\/\u63a5\u7d9a\u3059\u308bDB\u3092\u6307\u5b9a\u3059\u308b\u6587\u5b57\u5217\r\n\/\/URL:jdbc:mysql:\/\/db\u30b5\u30fc\u30d0\u30fc\u540d(localhost)\/DB\u540d\r\n\/\/MySQL\u306fURL\u306e\u5f62\u3060\u304c\u3001\u9055\u3046\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306f\u305d\u308c\u305e\u308c\u6307\u5b9a\u306e\u5f62\u3067\u884c\u3046\r\n\r\n\/\/\u5909\u6570con\u3092\u4f5c\u308b\r\n<\/code><\/pre>\n<h3>\u751f\u6210\u8bed\u53e5\u7ba1\u7406DB\u7684\u8fde\u63a5\u4fe1\u606f<\/p>\n<pre class=\"post-pre\"><code>Statement stmt = con.createStatement();\r\n\r\n\/\/\u5909\u6570con\u3092\u4f7f\u3046\r\n\/\/\u5909\u6570stmt\u3092\u4f5c\u308b\r\n<\/code><\/pre>\n<h3>\u6267\u884cSQL\u6267\u884c SQL<\/p>\n<pre class=\"post-pre\"><code>int count=stmt.executeUpdate(SQL\u6587);\r\n\r\n\/\/\u5909\u6570stmt\u3092\u4f7f\u3046\r\n\/\/\u5909\u6570count\u306b\u306f\u5909\u66f4\u4ef6\u6570\u304c\u5165\u308b\r\n<\/code><\/pre>\n<h3>\u91ca\u653e\u8d44\u6e90<\/p>\n<pre class=\"post-pre\"><code>stmt.close();\r\ncon.close();\r\n\r\n\/\/\u4f5c\u3063\u305f\u5909\u6570\u3092\u4f5c\u3063\u305f\u9806\u3068\u9006\u9806\u3067stmt\u21d2con\u306e\u9806\u756a\u3067\u9589\u3058\u308b\r\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u5b9e\u9645\u770b\u4e00\u4e0b\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.sql.DriverManager<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.sql.Connection<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.sql.Statement<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">InsertStudent<\/span><span class=\"o\">{<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">){<\/span>\r\n\r\n    <span class=\"c1\">\/\/\u300c\u2460DB\u306b\u63a5\u7d9a\u300d\u3067\u4f7f\u3046\u5f15\u6570\u3092\u4e8b\u524d\u306b\u8a2d\u5b9a<\/span>\r\n    <span class=\"kd\">final<\/span> <span class=\"nc\">String<\/span> <span class=\"no\">URL<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"jdbc:mysql:\/\/localhost\/sampledb\"<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"kd\">final<\/span> <span class=\"nc\">String<\/span> <span class=\"no\">USER<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"root\"<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"kd\">final<\/span> <span class=\"nc\">String<\/span> <span class=\"no\">PASS<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"pass\"<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"c1\">\/\/\u300c\u2462SQL\u3092\u5b9f\u884c\u300d\u3067\u4f7f\u3046\u5f15\u6570\u3092\u4e8b\u524d\u306b\u8a2d\u5b9a<\/span>\r\n    <span class=\"nc\">String<\/span> <span class=\"n\">sql<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"INSERT INTO student VALUES(6,'Kobayashi',95)\"<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"c1\">\/\/\u5909\u6570con\u3068stmt\u3092\u4e8b\u524d\u306bnull\u3067\u5b9a\u7fa9<\/span>\r\n    <span class=\"nc\">Connection<\/span> <span class=\"n\">con<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"nc\">Statement<\/span> <span class=\"n\">stmt<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"c1\">\/\/try\u5185\u3067\u5b9a\u7fa9\u3057\u3066\u3057\u307e\u3046\u3068\u3001try\u5185\u3067\u3057\u304b\u4f7f\u3048\u306a\u3044\u306e\u3067con\u3068stmt\u304cclose\u3067\u304d\u306a\u3044<\/span>\r\n    \r\n\r\n    <span class=\"k\">try<\/span><span class=\"o\">{<\/span>\r\n      <span class=\"c1\">\/\/\u2460DB\u306b\u63a5\u7d9a<\/span>\r\n      <span class=\"n\">con<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">DriverManager<\/span><span class=\"o\">.<\/span><span class=\"na\">getConnection<\/span><span class=\"o\">(<\/span><span class=\"no\">URL<\/span><span class=\"o\">,<\/span> <span class=\"no\">USER<\/span><span class=\"o\">,<\/span> <span class=\"no\">PASS<\/span><span class=\"o\">);<\/span>\r\n      \r\n      <span class=\"c1\">\/\/\u2461\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u751f\u6210<\/span>\r\n      <span class=\"n\">stmt<\/span> <span class=\"o\">=<\/span> <span class=\"n\">con<\/span><span class=\"o\">.<\/span><span class=\"na\">createStatement<\/span><span class=\"o\">();<\/span>\r\n      \r\n      <span class=\"c1\">\/\/\u2462SQL\u3092\u5b9f\u884c<\/span>\r\n      <span class=\"kt\">int<\/span> <span class=\"n\">count<\/span> <span class=\"o\">=<\/span> <span class=\"n\">stmt<\/span><span class=\"o\">.<\/span><span class=\"na\">executeUpdate<\/span><span class=\"o\">(<\/span><span class=\"n\">sql<\/span><span class=\"o\">);<\/span>      \r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span> <span class=\"n\">count<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\"\u4ef6\u66f4\u65b0\u3057\u307e\u3057\u305f\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span> <span class=\"k\">catch<\/span><span class=\"o\">(<\/span><span class=\"nc\">Exception<\/span> <span class=\"n\">e<\/span><span class=\"o\">){<\/span>\r\n     <span class=\"c1\">\/\/try\u306e\u4e2d\u3067\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u3068\u304d\u306e\u30a8\u30e9\u30fc\u8868\u793a<\/span>\r\n      <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">printStackTrace<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span> <span class=\"k\">finally<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"k\">try<\/span><span class=\"o\">{<\/span>\r\n        <span class=\"c1\">\/\/\u2463\u30ea\u30bd\u30fc\u30b9\u3092\u89e3\u653e<\/span>\r\n        <span class=\"c1\">\/\/\u4f8b\u5916\u304c\u767a\u751f\u3057\u3066\u3082\u5fc5\u305a\u5b9f\u884c\u3055\u308c\u308bfinally\u30d6\u30ed\u30c3\u30af\u306b<\/span>\r\n        <span class=\"c1\">\/\/null\u3060\u3068close\u304c\u3067\u304d\u306a\u3044\u306e\u3067if\u6587\u306b\u5165\u308c\u3066\u3044\u308b<\/span>\r\n        <span class=\"k\">if<\/span><span class=\"o\">(<\/span><span class=\"n\">stmt<\/span> <span class=\"o\">!=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span> <span class=\"n\">stmt<\/span><span class=\"o\">.<\/span><span class=\"na\">close<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"k\">if<\/span><span class=\"o\">(<\/span><span class=\"n\">con<\/span> <span class=\"o\">!=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span> <span class=\"n\">con<\/span><span class=\"o\">.<\/span><span class=\"na\">close<\/span><span class=\"o\">();<\/span>\r\n      <span class=\"o\">}<\/span> <span class=\"k\">catch<\/span><span class=\"o\">(<\/span><span class=\"nc\">Exception<\/span> <span class=\"n\">e<\/span><span class=\"o\">){<\/span>\r\n        <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">printStackTrace<\/span><span class=\"o\">();<\/span>\r\n      <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"c1\">\/\/con\u3068stmt\u306f\u5fc5\u305a\u30e9\u30b9\u30c8\u306bclose\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044<\/span>\r\n<\/code><\/pre>\n<h2>JDBC\u641c\u7d22\u5904\u7406\u7a0b\u5e8f\u7684\u6d41\u7a0b<\/p>\n<h3>\u6267\u884cSQL\u5728\u66f4\u65b0\u5904\u7406\u548c\u641c\u7d22\u5904\u7406\u4e2d\uff0c\u6267\u884cSQL\u8bed\u53e5\u65f6\u7684\u65b9\u6cd5\u4e0d\u540c\u3002<br \/>\n\u5728\u66f4\u65b0\u65f6\uff0c\u8fd4\u56de\u503c\u662f\u6570\u5b57\uff1b\u5728\u641c\u7d22\u65f6\uff0c\u8fd4\u56de\u503c\u662f\u641c\u7d22\u7ed3\u679c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">ResultSet<\/span> <span class=\"n\">rs<\/span> <span class=\"o\">=<\/span> <span class=\"n\">stmt<\/span><span class=\"o\">.<\/span><span class=\"na\">executeQuery<\/span><span class=\"o\">(<\/span><span class=\"nc\">SQL\u6587<\/span><span class=\"o\">);<\/span>\r\n\r\n<span class=\"c1\">\/\/ResultSet\u691c\u7d22\u3057\u305f\u7d50\u679c\u3092\u4fdd\u6301\u3057\u3066\u3044\u308b<\/span>\r\n<\/code><\/pre>\n<h3>\u5904\u7406\u641c\u7d22\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">while<\/span><span class=\"o\">(<\/span><span class=\"n\">rs<\/span><span class=\"o\">.<\/span><span class=\"na\">next<\/span><span class=\"o\">()){<\/span>\r\n<span class=\"c1\">\/\/getter\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u30c7\u30fc\u30bf\u578b\u306b\u3088\u308a\u8a18\u8ff0\u5185\u5bb9\u304c\u5909\u308f\u308b<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n\r\n<span class=\"c1\">\/\/next\u30e1\u30bd\u30c3\u30c9\u306f\u884c(\u6a2a\u8ef8)\u306e\u79fb\u52d5\u3001\u30c7\u30fc\u30bf\u304c\u3042\u308c\u3070\u623b\u308a\u5024\u306ftrue\u3001\u306a\u3051\u308c\u3070false<\/span>\r\n\r\n<span class=\"c1\">\/\/gettter\u30e1\u30bd\u30c3\u30c9\u306f\u5217(\u7e26\u8ef8)\u3078\u306e\u30a2\u30af\u30bb\u30b9<\/span>\r\n<span class=\"c1\">\/\/getXxx(\"\u5217\u540d\"\/\u5217\u756a\u53f7)\u5217\u756a\u53f7\u306f1\u304b\u3089\u59cb\u307e\u308b<\/span>\r\n<span class=\"c1\">\/\/String name = rs.getString(\"name\");<\/span>\r\n<\/code><\/pre>\n<h3>\u91ca\u653e\u8d44\u6e90\u540c\u6837\u9700\u8981\u91ca\u653e\u8d44\u6e90\u7684\u662f\u641c\u7d22\u5904\u7406\u3002<\/p>\n<pre class=\"post-pre\"><code>rs.close();\r\nstmt.close();\r\ncon.close();\r\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u5b9e\u9645\u52a8\u624b\u7f16\u5199\u4ee3\u7801\u5427\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.sql.DriverManager<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.sql.Connection<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.sql.Statement<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.sql.ResultSet<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">SelectAllStudent<\/span><span class=\"o\">{<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">){<\/span>\r\n  \r\n    <span class=\"kd\">final<\/span> <span class=\"nc\">String<\/span> <span class=\"no\">URL<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"jdbc:mysql:\/\/localhost\/sampledb\"<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"kd\">final<\/span> <span class=\"nc\">String<\/span> <span class=\"no\">USER<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"root\"<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"kd\">final<\/span> <span class=\"nc\">String<\/span> <span class=\"no\">PASS<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"pass\"<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"nc\">String<\/span> <span class=\"n\">sql<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"SELECT * FROM student\"<\/span><span class=\"o\">;<\/span>\r\n    \r\n    <span class=\"nc\">Connection<\/span> <span class=\"n\">con<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"nc\">Statement<\/span> <span class=\"n\">stmt<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"nc\">ResultSet<\/span> <span class=\"n\">rs<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"k\">try<\/span><span class=\"o\">{<\/span>\r\n      <span class=\"c1\">\/\/\u2460DB\u306b\u63a5\u7d9a<\/span>\r\n      <span class=\"n\">con<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">DriverManager<\/span><span class=\"o\">.<\/span><span class=\"na\">getConnection<\/span><span class=\"o\">(<\/span><span class=\"no\">URL<\/span><span class=\"o\">,<\/span> <span class=\"no\">USER<\/span><span class=\"o\">,<\/span> <span class=\"no\">PASS<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"c1\">\/\/\u2461\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u751f\u6210<\/span>\r\n      <span class=\"n\">stmt<\/span> <span class=\"o\">=<\/span> <span class=\"n\">con<\/span><span class=\"o\">.<\/span><span class=\"na\">createStatement<\/span><span class=\"o\">();<\/span>\r\n      <span class=\"c1\">\/\/\u2462SQL\u3092\u5b9f\u884c<\/span>\r\n      <span class=\"n\">rs<\/span> <span class=\"o\">=<\/span> <span class=\"n\">stmt<\/span><span class=\"o\">.<\/span><span class=\"na\">executeQuery<\/span><span class=\"o\">(<\/span><span class=\"n\">sql<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"c1\">\/\/\u2463\u691c\u7d22\u7d50\u679c\u306e\u51e6\u7406<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"+-------+-------+-------+\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"| no    | name  | score |\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"+-------+-------+-------+\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"k\">while<\/span><span class=\"o\">(<\/span><span class=\"n\">rs<\/span><span class=\"o\">.<\/span><span class=\"na\">next<\/span><span class=\"o\">()){<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">print<\/span><span class=\"o\">(<\/span><span class=\"s\">\"| \"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">rs<\/span><span class=\"o\">.<\/span><span class=\"na\">getInt<\/span><span class=\"o\">(<\/span><span class=\"s\">\"no\"<\/span><span class=\"o\">)<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\"\\t\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">print<\/span><span class=\"o\">(<\/span><span class=\"s\">\"| \"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">rs<\/span><span class=\"o\">.<\/span><span class=\"na\">getString<\/span><span class=\"o\">(<\/span><span class=\"s\">\"name\"<\/span><span class=\"o\">)<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\"\\t\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"| \"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">rs<\/span><span class=\"o\">.<\/span><span class=\"na\">getInt<\/span><span class=\"o\">(<\/span><span class=\"s\">\"score\"<\/span><span class=\"o\">)<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\"\\t|\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"o\">}<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"+-------+-------+-------+\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span> <span class=\"k\">catch<\/span><span class=\"o\">(<\/span><span class=\"nc\">Exception<\/span> <span class=\"n\">e<\/span><span class=\"o\">){<\/span>\r\n      <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">printStackTrace<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span> <span class=\"k\">finally<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"k\">try<\/span><span class=\"o\">{<\/span>\r\n        <span class=\"c1\">\/\/\u2464\u30ea\u30bd\u30fc\u30b9\u306e\u89e3\u653e<\/span>\r\n        <span class=\"k\">if<\/span><span class=\"o\">(<\/span><span class=\"n\">rs<\/span> <span class=\"o\">!=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span> <span class=\"n\">rs<\/span><span class=\"o\">.<\/span><span class=\"na\">close<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"k\">if<\/span><span class=\"o\">(<\/span><span class=\"n\">stmt<\/span> <span class=\"o\">!=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span> <span class=\"n\">stmt<\/span><span class=\"o\">.<\/span><span class=\"na\">close<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"k\">if<\/span><span class=\"o\">(<\/span><span class=\"n\">con<\/span> <span class=\"o\">!=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span> <span class=\"n\">con<\/span><span class=\"o\">.<\/span><span class=\"na\">close<\/span><span class=\"o\">();<\/span>\r\n      <span class=\"o\">}<\/span> <span class=\"k\">catch<\/span><span class=\"o\">(<\/span><span class=\"nc\">Exception<\/span> <span class=\"n\">e<\/span><span class=\"o\">){<\/span>\r\n        <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">printStackTrace<\/span><span class=\"o\">();<\/span>\r\n      <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<\/code><\/pre>\n<h1>\u4f7f\u7528\u9884\u7f16\u8bd1\u8bed\u53e5\u3002<br \/>\n\u9884\u5907\u7684\u610f\u601d\u662f\u5df2\u7ecf\u51c6\u5907\u597d\u7684\u3002<br \/>\n\u8fd9\u79cd\u65b9\u6cd5\u662f\u5728\u8bed\u53e5\u9636\u6bb5\u5c06SQL\u8bed\u53e5\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u53ef\u4ee5\u4e8b\u5148\u7f16\u5199\u6307\u5b9a\u4e86IN\u53c2\u6570\u7684SQL\u8bed\u53e5\uff0c\u5e76\u4f7f\u7528setter\u65b9\u6cd5\u7b80\u4fbf\u5730\u5c06\u503c\u8d4b\u7ed9SQL\u8bed\u53e5\u7684IN\u53c2\u6570\u3002<\/p>\n<h3>\u64cd\u4f5c\u6b65\u9aa4\u6307\u5b9a\u4e00\u4e2a\u5305\u542bIN\u53c2\u6570\u7684SQL\u8bed\u53e5<br \/>\nIN\u53c2\u6570\u662f\u6307(?.?.?)<\/p>\n<pre class=\"post-pre\"><code>INSERT INTO students VALUES(?.?.?)\r\n<\/code><\/pre>\n<p>\u4f7f\u7528setter\u65b9\u6cd5\u6765\u8bbe\u7f6e\u503c\u5230\uff1f<\/p>\n<p>\u4f7f\u7528setter\u51fd\u6570\u6765\u7ed9\uff1f\u8d4b\u503c\u3002<\/p>\n<pre class=\"post-pre\"><code>ps.setInt(1,7);\r\nps.setString(2,\"\u85e4\u539f\");\r\n\r\n\/\/\u30c7\u30fc\u30bf\u578b\u306f\u7b2c2\u5f15\u6570\u306b\u5408\u308f\u305b\u308b\r\n\/\/\u7b2c1\u5f15\u6570\u306f?\u306e\u4f4d\u7f6e\u3092\u6307\u5b9a\u3057\u3066\u3044\u308b\r\n<\/code><\/pre>\n<p>\u6267\u884cSQL<\/p>\n<p>\u5fc5\u987b\u5173\u95ed\u8d44\u6e90\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u5b9e\u9645\u52a8\u624b\u5199\u4e00\u6b21<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.sql.DriverManager<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.sql.Connection<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.sql.PreparedStatement<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">InsertStudent2<\/span><span class=\"o\">{<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">){<\/span>\r\n  \r\n    <span class=\"kd\">final<\/span> <span class=\"nc\">String<\/span> <span class=\"no\">URL<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"jdbc:mysql:\/\/localhost\/sampledb\"<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"kd\">final<\/span> <span class=\"nc\">String<\/span> <span class=\"no\">USER<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"root\"<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"kd\">final<\/span> <span class=\"nc\">String<\/span> <span class=\"no\">PASS<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"pass\"<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"nc\">String<\/span> <span class=\"n\">sql<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"INSERT INTO student VALUES(?, ?, ?)\"<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">names<\/span> <span class=\"o\">=<\/span> <span class=\"o\">{<\/span><span class=\"s\">\"sato\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"yamada\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"kawata\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"uchida\"<\/span><span class=\"o\">};<\/span>\r\n    <span class=\"kt\">int<\/span><span class=\"o\">[]<\/span> <span class=\"n\">scores<\/span> <span class=\"o\">=<\/span> <span class=\"o\">{<\/span><span class=\"mi\">90<\/span><span class=\"o\">,<\/span> <span class=\"mi\">85<\/span><span class=\"o\">,<\/span> <span class=\"mi\">80<\/span><span class=\"o\">,<\/span> <span class=\"mi\">75<\/span><span class=\"o\">};<\/span>\r\n    \r\n    <span class=\"nc\">Connection<\/span> <span class=\"n\">con<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"nc\">PreparedStatement<\/span> <span class=\"n\">ps<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">;<\/span>\r\n    \r\n    <span class=\"k\">try<\/span><span class=\"o\">{<\/span>\r\n      <span class=\"c1\">\/\/\u2460DB\u306b\u63a5\u7d9a<\/span>\r\n      <span class=\"n\">con<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">DriverManager<\/span><span class=\"o\">.<\/span><span class=\"na\">getConnection<\/span><span class=\"o\">(<\/span><span class=\"no\">URL<\/span><span class=\"o\">,<\/span> <span class=\"no\">USER<\/span><span class=\"o\">,<\/span> <span class=\"no\">PASS<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"c1\">\/\/\u2461\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u751f\u6210<\/span>\r\n      <span class=\"n\">ps<\/span> <span class=\"o\">=<\/span> <span class=\"n\">con<\/span><span class=\"o\">.<\/span><span class=\"na\">prepareStatement<\/span><span class=\"o\">(<\/span><span class=\"n\">sql<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"c1\">\/\/\u2462SQL\u3092\u5b9f\u884c<\/span>\r\n      <span class=\"k\">for<\/span><span class=\"o\">(<\/span><span class=\"kt\">int<\/span> <span class=\"n\">i<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"o\">;<\/span> <span class=\"n\">i<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">names<\/span><span class=\"o\">.<\/span><span class=\"na\">length<\/span><span class=\"o\">;<\/span> <span class=\"n\">i<\/span><span class=\"o\">++){<\/span>\r\n        <span class=\"n\">ps<\/span><span class=\"o\">.<\/span><span class=\"na\">setInt<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">,<\/span> <span class=\"n\">i<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">7<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">ps<\/span><span class=\"o\">.<\/span><span class=\"na\">setString<\/span><span class=\"o\">(<\/span><span class=\"mi\">2<\/span><span class=\"o\">,<\/span> <span class=\"n\">names<\/span><span class=\"o\">[<\/span><span class=\"n\">i<\/span><span class=\"o\">]);<\/span>\r\n        <span class=\"n\">ps<\/span><span class=\"o\">.<\/span><span class=\"na\">setInt<\/span><span class=\"o\">(<\/span><span class=\"mi\">3<\/span><span class=\"o\">,<\/span> <span class=\"n\">scores<\/span><span class=\"o\">[<\/span><span class=\"n\">i<\/span><span class=\"o\">]);<\/span>\r\n        <span class=\"n\">ps<\/span><span class=\"o\">.<\/span><span class=\"na\">executeUpdate<\/span><span class=\"o\">();<\/span>\r\n      <span class=\"o\">}<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span> <span class=\"n\">names<\/span><span class=\"o\">.<\/span><span class=\"na\">length<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\"\u4ef6\u66f4\u65b0\u3057\u307e\u3057\u305f\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span> <span class=\"k\">catch<\/span><span class=\"o\">(<\/span><span class=\"nc\">Exception<\/span> <span class=\"n\">e<\/span><span class=\"o\">){<\/span>\r\n      <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">printStackTrace<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span> <span class=\"k\">finally<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"k\">try<\/span><span class=\"o\">{<\/span>\r\n        <span class=\"c1\">\/\/\u30ea\u30bd\u30fc\u30b9\u306e\u89e3\u653e<\/span>\r\n        <span class=\"k\">if<\/span><span class=\"o\">(<\/span><span class=\"n\">ps<\/span> <span class=\"o\">!=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span> <span class=\"n\">ps<\/span><span class=\"o\">.<\/span><span class=\"na\">close<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"k\">if<\/span><span class=\"o\">(<\/span><span class=\"n\">con<\/span> <span class=\"o\">!=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span> <span class=\"n\">con<\/span><span class=\"o\">.<\/span><span class=\"na\">close<\/span><span class=\"o\">();<\/span>\r\n      <span class=\"o\">}<\/span> <span class=\"k\">catch<\/span><span class=\"o\">(<\/span><span class=\"nc\">Exception<\/span> <span class=\"n\">e<\/span><span class=\"o\">){<\/span>\r\n        <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">printStackTrace<\/span><span class=\"o\">();<\/span>\r\n      <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n\r\n<\/code><\/pre>\n<h1>\u6d89\u53caWeb\u5e94\u7528\u7684\u5173\u952e\u8bcd<br \/>\n\u8fd9\u91cc\u53ea\u662f\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b\u5173\u952e\u8bcd\uff0c\u4e0d\u505a\u8be6\u7ec6\u89e3\u91ca\u3002<\/p>\n<h3>MVC\u6a21\u578b\u5c06\u5e94\u7528\u7a0b\u5e8f\u5206\u4e3a\u6a21\u578b\u3001\u89c6\u56fe\u548c\u63a7\u5236\u5668\u4e09\u90e8\u5206\uff0c\u5e76\u76f8\u4e92\u4f5c\u7528\u6765\u642d\u5efa\u5e94\u7528\u7a0b\u5e8f\u7684\u673a\u5236\u3002\u8fd9\u79cd\u673a\u5236\u5728\u4e4b\u524d\u81ea\u5df1\u5b66\u4e60\u7684Ruby on Rails\u4e2d\u4e5f\u88ab\u4f7f\u7528\uff0cJava\u4e5f\u91c7\u7528\u4e86\u7c7b\u4f3c\u7684\u673a\u5236\u3002<\/p>\n<p>\u7531\u4e8eMVC\u6a21\u578b\u7684\u8be6\u7ec6\u4ecb\u7ecd\u5728\u53e6\u4e00\u7bc7\u6587\u7ae0\u4e2d\u5df2\u7ecf\u6574\u7406\u597d\uff0c\u8bf7\u53c2\u8003\u90a3\u7bc7\u6587\u7ae0\u3002<\/p>\n<p>&nbsp;<\/p>\n<h1>\u5728Java\u7684MVC\u4e2d\u7684\u5173\u952e\u8bcdRuby on Rails\u548cJava\u7684MVC\u6a21\u578b\u6709\u4e00\u4e2a\u5f88\u5927\u7684\u533a\u522b\uff0c\u5c31\u662fJava\u7684MVC\u6a21\u578b\u8981\u6839\u636eJava\u7684\u8bed\u6cd5\u89c4\u8303\u6765\u521b\u5efa\u3002\u800c\u5728Ruby on Rails\u4e2d\uff0c\u7531\u4e8e\u6bcf\u4e2aMVC\u7ec4\u4ef6\u7684\u7f16\u5199\u65b9\u5f0f\u90fd\u4e0d\u540c\uff0c\u6240\u4ee5\u8fd9\u662f\u4e00\u4e2a\u5f88\u5927\u7684\u533a\u522b\u3002<\/p>\n<p>DAO<br \/>\nData Accces Object\u306e\u7565\u3002<br \/>\nMVC\u30e2\u30c7\u30eb\u306e\u30e2\u30c7\u30eb\u306b\u5f53\u305f\u308b\u3002<br \/>\n\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3068\u306e\u3084\u308a\u3068\u308a\u306e\u7b87\u6240\u306e\u307f\u3002<br \/>\n\u57fa\u672c\u7684\u306bSQL\u304c\u3089\u307f\u306e\u8a18\u8ff0\u306fDAO\u306b\u3059\u308b\u30a4\u30e1\u30fc\u30b8\u3002<\/p>\n<p>\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8<br \/>\nMVC\u30e2\u30c7\u30eb\u306e\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u30fc\u306b\u5f53\u305f\u308b\u3002<\/p>\n<p>JSP<br \/>\nJava Server Pages\u306e\u7565<br \/>\nMVC\u30e2\u30c7\u30eb\u306e\u30d3\u30e5\u30fc\u306b\u5f53\u305f\u308b\u3002HTML\u306a\u3069\u3067\u8a18\u8ff0\u3059\u308b\u3002<\/p>\n<h3>Java\u7684MVC\u8981\u70b9 (Java de MVCDAO\u548cServlet\u662f\u4e00\u79cd\u80fd\u591f\u8fde\u63a5\u5df2\u5b58\u5728\u7684\u7c7b\u4e4b\u95f4\u7684\u8bed\u6cd5\uff0c\u53ef\u4ee5\u5efa\u7acb\u5b83\u4eec\u4e4b\u95f4\u7684\u8fde\u63a5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">StuDAO<\/span> <span class=\"n\">sdao<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">StuDAO<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"c1\">\/\/\u3053\u306e\u8a18\u8ff0\u3067\u300cStuDAO\u300d\u3068\u3044\u3046\u540d\u524d\u306eDAO\u30d5\u30a1\u30a4\u30eb\u3068\u63a5\u7d9a\u304c\u3067\u304d\u308b\u3002<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">DTO<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Data Transfer Object<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30c7\u30fc\u30bf\u3092\u8ee2\u9001\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u30af\u30e9\u30b9<\/ul>\n<pre class=\"post-pre\"><code><span class=\"nc\">StuDTO<\/span> <span class=\"nf\">select<\/span><span class=\"o\">(){...}<\/span>\r\n\r\n<span class=\"c1\">\/\/\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u60c5\u5831\u3092\u3059\u3079\u3066\u53d6\u5f97\u3059\u308b\u30a4\u30e1\u30fc\u30b8<\/span>\r\n<\/code><\/pre>\n<p>Entitiy\u30af\u30e9\u30b9<br \/>\n\u30c6\u30fc\u30d6\u30eb\u306e1\u884c\u5206\u3092\u8ee2\u9001\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u30af\u30e9\u30b9\u306e\u3053\u3068\u3002DTO\u306e\u4e2d\u306e\uff11\u3064\u306e\u3088\u3046\u306a\u30a4\u30e1\u30fc\u30b8\u3002<br \/>\nDTO\u306badd,get,size\u30e1\u30bd\u30c3\u30c9\u306a\u3069\u306e\u3001\u4e00\u89a7\u304b\u3089\u8868\u793a\u3059\u308b\u3088\u3046\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3002<br \/>\nEntity\u306b\u306f\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u9805\u76ee\uff08\u6c0f\u540d\u3001\u751f\u5f92\u756a\u53f7\uff09\u306a\u3069\u306e\u60c5\u5831\u306b\u57fa\u3065\u3044\u305fset,get\u30e1\u30bd\u30c3\u30c9\u306e\u5b9a\u7fa9\u304c\u5fc5\u8981<\/p>\n<p>DAO\u3068DTO\u3068Entity<br \/>\n\u3059\u3054\u304f\u3075\u3093\u308f\u308a\u3057\u305f\u30a4\u30e1\u30fc\u30b8\u3002<br \/>\n\u30af\u30e9\u30b9\u306e\u7a2e\u985e\u3002\uff13\u30af\u30e9\u30b9\u3068\u3082\u5fc5\u305a\u4e8b\u524d\u306b\u5b9a\u7fa9\u304c\u5fc5\u8981\u3002<br \/>\nDAO\u306f\u30c7\u30fc\u30bf\u53d6\u5f97<br \/>\nDTO\u306f\u30c7\u30fc\u30bf\u8ee2\u9001\uff08\u5168\u4ef6\u30c7\u30fc\u30bf\uff09<br \/>\nEntity\u306f\u30c7\u30fc\u30bf\u8ee2\u9001\u306e\u3088\u308a\u8a73\u7d30\u306a\u6307\u793a\uff08\u8a73\u7d30\u30c7\u30fc\u30bf\uff09<br \/>\nDTO\u3068Entity\u306fDAO\u3092\u88dc\u52a9\u3059\u308b\u30c4\u30fc\u30eb\u30af\u30e9\u30b9\u307f\u305f\u3044\u306a\u30a4\u30e1\u30fc\u30b8<br \/>\n\u4e00\u89a7\u60c5\u5831\u3092DTO\u3067\u53d6\u5f97\u3057\u3001Entity\u30671\u884c\u306a\u3069\u306e\u8a73\u7d30\u60c5\u5831\u3092\u53d6\u5f97\u3059\u308b\u30a4\u30e1\u30fc\u30b8\u3002<br 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