{"id":34484,"date":"2024-01-11T08:44:42","date_gmt":"2023-06-10T09:09:52","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8rails-cache-fetch%e7%9a%84%e4%bb%a3%e7%a0%81%e5%9d%97%e5%86%85%ef%bc%8c%e4%bc%bc%e4%b9%8e%e4%b8%8d%e5%ba%94%e4%bd%bf%e7%94%a8return%e8%af%ad%e5%8f%a5%e3%80%82\/"},"modified":"2024-05-04T17:51:12","modified_gmt":"2024-05-04T09:51:12","slug":"%e5%9c%a8rails-cache-fetch%e7%9a%84%e4%bb%a3%e7%a0%81%e5%9d%97%e5%86%85%ef%bc%8c%e4%bc%bc%e4%b9%8e%e4%b8%8d%e5%ba%94%e4%bd%bf%e7%94%a8return%e8%af%ad%e5%8f%a5%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8rails-cache-fetch%e7%9a%84%e4%bb%a3%e7%a0%81%e5%9d%97%e5%86%85%ef%bc%8c%e4%bc%bc%e4%b9%8e%e4%b8%8d%e5%ba%94%e4%bd%bf%e7%94%a8return%e8%af%ad%e5%8f%a5%e3%80%82\/","title":{"rendered":"\u5728Rails.cache.fetch\u7684\u4ee3\u7801\u5757\u5185\uff0c\u4f3c\u4e4e\u4e0d\u5e94\u4f7f\u7528return\u8bed\u53e5"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u8fd9\u7bc7\u6587\u7ae0\u662f\u4e00\u4e2a\u4f7f\u7528\u4e0d\u52301\u5e74\u7684Rails\u521d\u5b66\u8005\u6240\u5199\u7684\u5185\u5bb9\u3002<br \/>\n\u8bf7\u6ce8\u610f\uff0c\u7531\u4e8e\u6211\u4f7f\u7528\u7684\u662f\u65e7\u7248\u672c\uff08Rails 4\uff09\uff0c\u6700\u65b0\u7248\u672c\u53ef\u80fd\u4e0d\u4f1a\u51fa\u73b0\u76f8\u540c\u7684\u95ee\u9898\u3002<\/p>\n<h2>\u793a\u4f8b\u4ee3\u78bc<\/h2>\n<p>\u5728\u4e0b\u9762\u7684\u793a\u4f8b\u6e90\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u6309\u7167col1\u3001col2\u3001col3\u7684\u987a\u5e8f\u5bf9tests\u8868\u8fdb\u884c\u641c\u7d22\uff0c\u5e76\u5728\u627e\u5230\u7b26\u5408\u641c\u7d22\u6761\u4ef6\u7684\u6570\u636e\u65f6\u4e0d\u6267\u884c\u540e\u7eed\u5904\u7406\u800c\u8fd4\u56de\u641c\u7d22\u7ed3\u679c\u3002<br \/>\n\u540c\u65f6\uff0c\u641c\u7d22\u7ed3\u679c\u5c06\u4fdd\u6301\u5728\u7f13\u5b58\u4e2d\uff0830\u5206\u949f\uff09\uff0c\u5982\u679c\u5728\u6307\u5b9a\u7684\u65f6\u95f4\u6bb5\u5185\u518d\u6b21\u6267\u884c\uff0c\u5219\u4e0d\u4f1a\u8bbf\u95ee\u6570\u636e\u5e93\uff0c\u800c\u662f\u8fd4\u56de\u7f13\u5b58\u4e2d\u7684\u6570\u636e\u3002<\/p>\n<pre class=\"post-pre\"><code>def get_testdata( col1 , col2 , col3 )\r\n  Rails.cache.fetch(\"test-#{col1}-#{col2}-#{col3}\", expires_in: 30.minutes ) do\r\n\r\n    test = Test.where(col1: col1).first\r\n    return test if test\r\n\r\n    test = Test.where(col2: col2).first\r\n    return test if test\r\n\r\n    test = Test.where(col3: col3).first\r\n    return test if test\r\n\r\n    nil\r\n  end\r\nend\r\n<\/code><\/pre>\n<p>\u90a3\u4e48\uff0c\u8ba9\u6211\u4eec\u4eceRails\u7684\u63a7\u5236\u53f0\u4e2d\u5b9e\u9645\u8fd0\u884c\u8fd9\u4e2a\u5904\u7406\u8fc7\u7a0b\u5427\u3002<\/p>\n<h3>\u7b2c\u4e00\u6b21<\/h3>\n<pre class=\"post-pre\"><code>[2] pry(main)&gt; get_testdata(\"test1\",\"test2\",\"test3\")\r\nCache read: test-test1-test2-test3 ({:expires_in=&gt;1800 seconds})\r\nCache generate: test-test1-test2-test3 ({:expires_in=&gt;1800 seconds})\r\n  Test Load (0.7ms)  SELECT  `tests`.* FROM `tests`  WHERE `tests`.`col1` = 'test1'  ORDER BY `tests`.`id` ASC LIMIT 1\r\n  Test Load (0.4ms)  SELECT  `tests`.* FROM `tests`  WHERE `tests`.`col2` = 'test2'  ORDER BY `tests`.`id` ASC LIMIT 1\r\n  Test Load (0.4ms)  SELECT  `tests`.* FROM `tests`  WHERE `tests`.`col3` = 'test3'  ORDER BY `tests`.`id` ASC LIMIT 1\r\n=&gt; #&lt;Test id: 1, col1: \"test3\", col2: \"test3\", col3: \"test3\"&gt;\r\n[3] pry(main)&gt; \r\n<\/code><\/pre>\n<p>\u54e6\uff0c\u6570\u636e\u5df2\u83b7\u53d6\u5230\u3002<br \/>\n\u7531\u4e8eSQL\u5df2\u88ab\u6267\u884c\u4e86\u4e09\u6b21\uff0c\u4f3c\u4e4e\u53ea\u6709\u7b26\u5408col3\u6761\u4ef6\u7684\u6570\u636e\u3002<br \/>\n\u5982\u679c\u518d\u6b21\u4f7f\u7528\u76f8\u540c\u6761\u4ef6\u8fdb\u884c\u6267\u884c\uff0c\u6570\u636e\u5e94\u8be5\u4f1a\u4ece\u7f13\u5b58\u4e2d\u83b7\u53d6\uff0c\u6240\u4ee5\u4e0d\u4f1a\u518d\u6267\u884cSQL\u3002<\/p>\n<h3>\u7b2c\u4e8c\u6b21<\/h3>\n<pre class=\"post-pre\"><code>[3] pry(main)&gt; get_testdata(\"test1\",\"test2\",\"test3\")\r\nCache read: test-test1-test2-test3 ({:expires_in=&gt;1800 seconds})\r\nCache generate: test-test1-test2-test3 ({:expires_in=&gt;1800 seconds})\r\n  Test Load (7.1ms)  SELECT  `tests`.* FROM `tests`  WHERE `tests`.`col1` = 'test1'  ORDER BY `tests`.`id` ASC LIMIT 1\r\n  Test Load (105.7ms)  SELECT  `tests`.* FROM `tests`  WHERE `tests`.`col2` = 'test2'  ORDER BY `tests`.`id` ASC LIMIT 1\r\n  Test Load (54.5ms)  SELECT  `tests`.* FROM `tests`  WHERE `tests`.`col3` = 'test3'  ORDER BY `tests`.`id` ASC LIMIT 1\r\n=&gt; #&lt;Test id: 1, col1: \"test3\", col2: \"test3\", col3: \"test3\"&gt;\r\n[4] pry(main)&gt; \r\n<\/code><\/pre>\n<p>&#8230; \u770b\u8d77\u6765\u597d\u50cf\u6267\u884c\u4e86\u4e0e\u7b2c\u4e00\u6b21\u76f8\u540c\u7684SQL\u8bed\u53e5\u3002<br \/>\n\u53ef\u80fd\u53ea\u662f\u6211\u81ea\u5df1\u7684\u9519\u89c9\uff0c\u6240\u4ee5\u8ba9\u6211\u4eec\u518d\u8bd5\u4e00\u6b21\u6267\u884c\u3002<\/p>\n<h3>\u7b2c\u4e09\u6b21<\/h3>\n<pre class=\"post-pre\"><code>[4] pry(main)&gt; get_testdata(\"test1\",\"test2\",\"test3\")\r\nCache read: test-test1-test2-test3 ({:expires_in=&gt;1800 seconds})\r\nCache generate: test-test1-test2-test3 ({:expires_in=&gt;1800 seconds})\r\n  Test Load (0.7ms)  SELECT  `tests`.* FROM `tests`  WHERE `tests`.`col1` = 'test1'  ORDER BY `tests`.`id` ASC LIMIT 1\r\n  Test Load (0.4ms)  SELECT  `tests`.* FROM `tests`  WHERE `tests`.`col2` = 'test2'  ORDER BY `tests`.`id` ASC LIMIT 1\r\n  Test Load (0.4ms)  SELECT  `tests`.* FROM `tests`  WHERE `tests`.`col3` = 'test3'  ORDER BY `tests`.`id` ASC LIMIT 1\r\n=&gt; #&lt;Test id: 1, col1: \"test3\", col2: \"test3\", col3: \"test3\"&gt;\r\n[5] pry(main)&gt; \r\n<\/code><\/pre>\n<p>&#8230;&#8230;\u4f3c\u4e4e\u4e0d\u662f\u5fc3\u7406\u4f5c\u7528\u3002<br \/>\n\u7531\u4e8e\u7f13\u5b58\u672a\u80fd\u6b63\u5e38\u5de5\u4f5c\uff0c\u4f3c\u4e4e\u6bcf\u6b21\u90fd\u5728\u8bbf\u95ee\u6570\u636e\u5e93\u5462\u3002<br \/>\n\u6211\u5c06\u521b\u5efa\u4e00\u4e2a\u7b80\u5316\u7684\u6e90\u7801\u4f9b\u68c0\u67e5\u7f13\u5b58\u4f7f\u7528\u3002<\/p>\n<h2>\u6837\u672c\u6e90\u4ee3\u7801\uff08\u7528\u4e8e\u7f13\u5b58\u786e\u8ba4\uff09<\/h2>\n<pre class=\"post-pre\"><code>def get_testdata2( col1 )\r\n  Rails.cache.fetch(\"test2-#{col1}\", expires_in: 30.minutes ) do\r\n    Test.where(col1: col1).first\r\n  end\r\nend\r\n<\/code><\/pre>\n<p>\u56e0\u6b64\uff0c\u6211\u521b\u5efa\u4e86\u4e00\u4e2a\u7528\u4e8e\u786e\u8ba4\u7f13\u5b58\u7684\u793a\u4f8b\u6e90\u4ee3\u7801\u3002<br \/>\n\u5982\u679c\u8fd9\u4e2a\u4ee3\u7801\u4e0d\u8d77\u4f5c\u7528\uff0c\u53ef\u80fd\u662f\u6267\u884c\u73af\u5883\u51fa\u4e86\u95ee\u9898\u3002<\/p>\n<h3>\u7b2c\u4e00\u6b21<\/h3>\n<pre class=\"post-pre\"><code>[2] pry(main)&gt; get_testdata2(\"test3\")\r\nCache read: test2-test3 ({:expires_in=&gt;1800 seconds})\r\nCache generate: test2-test3 ({:expires_in=&gt;1800 seconds})\r\n  Test Load (0.7ms)  SELECT  `tests`.* FROM `tests`  WHERE `tests`.`col1` = 'test3'  ORDER BY `tests`.`id` ASC LIMIT 1\r\nCache write: test2-test3 ({:expires_in=&gt;1800 seconds})\r\n=&gt; #&lt;Test id: 1, col1: \"test3\", col2: \"test3\", col3: \"test3\"&gt;\r\n[3] pry(main)&gt; \r\n<\/code><\/pre>\n<p>\u770b\u8d77\u6765\u6210\u529f\u83b7\u53d6\u5230\u6570\u636e\u4e86\u3002<br \/>\n\u8fd9\u6b21\u6267\u884c\u65f6\uff0c\u4e4b\u524d\u6ca1\u6709\u8f93\u51fa\u7684\u201cCache write\u201d\u6587\u5b57\u5df2\u7ecf\u8f93\u51fa\u5728\u6267\u884c\u7ed3\u679c\u4e2d\u3002<\/p>\n<h3>\u7b2c\u4e8c\u6b21<\/h3>\n<pre class=\"post-pre\"><code>[3] pry(main)&gt; get_testdata2(\"test3\")\r\nCache read: test2-test3 ({:expires_in=&gt;1800 seconds})\r\nCache fetch_hit: test2-test3 ({:expires_in=&gt;1800 seconds})\r\n=&gt; #&lt;Test id: 1, col1: \"test3\", col2: \"test3\", col3: \"test3\"&gt;\r\n[4] pry(main)&gt;\r\n<\/code><\/pre>\n<p>\u54e6\uff0c\u80fd\u591f\u5728\u6ca1\u6709\u6267\u884cSQL\u7684\u60c5\u51b5\u4e0b\u83b7\u53d6\u5230\u6570\u636e\u3002<br \/>\n\u7531\u4e8e\u7f13\u5b58\u6b63\u5e38\u5de5\u4f5c\uff0c\u6267\u884c\u73af\u5883\u4f3c\u4e4e\u6ca1\u6709\u95ee\u9898\u3002<br \/>\n\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u9010\u6b65\u6dfb\u52a0\u5904\u7406\u5e76\u786e\u8ba4\u95ee\u9898\u5728\u54ea\u91cc\u51fa\u73b0\u3002<\/p>\n<h2>\u6837\u672c\u6e90\u4ee3\u7801\uff08\u7528\u4e8e\u8fd4\u56de\u786e\u8ba4\uff09<\/h2>\n<pre class=\"post-pre\"><code>def get_testdata3( col1 )\r\n  Rails.cache.fetch(\"test3-#{col1}\", expires_in: 30.minutes ) do\r\n    return Test.where(col1: col1).first\r\n  end\r\nend\r\n<\/code><\/pre>\n<p>\u6211\u5728\u6837\u672c\u6e90\u4ee3\u7801\u4e2d\u6dfb\u52a0\u4e86\u4e00\u4e2a\u4ec5\u5305\u542breturn\u7684\u8bed\u53e5\uff08\u7528\u4e8e\u7f13\u5b58\u786e\u8ba4\uff09\u3002\u8ba9\u6211\u4eec\u5f00\u59cb\u6267\u884c\u5427\u3002<\/p>\n<h3>\u7b2c\u4e00\u6b21<\/h3>\n<pre class=\"post-pre\"><code>[2] pry(main)&gt; get_testdata3(\"test3\")\r\nCache read: test3-test3 ({:expires_in=&gt;1800 seconds})\r\nCache generate: test3-test3 ({:expires_in=&gt;1800 seconds})\r\n  Test Load (0.9ms)  SELECT  `tests`.* FROM `tests`  WHERE `tests`.`col1` = 'test3'  ORDER BY `tests`.`id` ASC LIMIT 1\r\n=&gt; #&lt;Test id: 1, col1: \"test3\", col2: \"test3\", col3: \"test3\"&gt;\r\n[3] pry(main)&gt;\r\n<\/code><\/pre>\n<p>\u597d\u50cf\u6210\u529f\u83b7\u53d6\u5230\u4e86\u6570\u636e\u3002<br \/>\n\u5728\u7528\u4e8e\u7f13\u5b58\u786e\u8ba4\u7684\u793a\u4f8b\u6e90\u4ee3\u7801\u4e2d\uff0c\u4e0d\u518d\u8f93\u51fa\u201cCache write\u201d\u8fd9\u4e2a\u6587\u5b57\u3002<\/p>\n<h3>\u7b2c\u4e8c\u6b21<\/h3>\n<pre class=\"post-pre\"><code>[3] pry(main)&gt; get_testdata3(\"test3\")\r\nCache read: test3-test3 ({:expires_in=&gt;1800 seconds})\r\nCache generate: test3-test3 ({:expires_in=&gt;1800 seconds})\r\n  Test Load (0.7ms)  SELECT  `tests`.* FROM `tests`  WHERE `tests`.`col1` = 'test3'  ORDER BY `tests`.`id` ASC LIMIT 1\r\n=&gt; #&lt;Test id: 1, col1: \"test3\", col2: \"test3\", col3: \"test3\"&gt;\r\n[4] pry(main)&gt; \r\n<\/code><\/pre>\n<p>\u5df2\u7ecf\u786e\u8ba4\u7b2c\u4e8c\u6b21\u6267\u884c\u4e0e\u7b2c\u4e00\u6b21\u76f8\u540c\u7684 SQL\uff0c\u5c31\u50cf\u6700\u521d\u7684\u793a\u4f8b\u6e90\u4ee3\u7801\u4e00\u6837\u3002<br \/>\n\u4f3c\u4e4e\u539f\u56e0\u662f\u4f7f\u7528\u4e86return\u5b50\u53e5\u5bfc\u81f4\u79bb\u5f00\u4e86\u7f13\u5b58\u76ee\u6807\u5757\u3002<br \/>\n\u90a3\u4e48\uff0c\u8ba9\u6211\u4eec\u4fee\u6539\u793a\u4f8b\u6e90\u4ee3\u7801\uff0c\u4e0d\u518d\u4f7f\u7528return\u5b50\u53e5\u3002<\/p>\n<h2>\u30b5\u30f3\u30d7\u30eb\u30bd\u30fc\u30b9\uff08\u4fee\u6b63\u7248\uff09<\/h2>\n<pre class=\"post-pre\"><code>def get_testdata( col1 , col2 , col3 )\r\n  Rails.cache.fetch(\"test-#{col1}-#{col2}-#{col3}\", expires_in: 30.minutes ) do\r\n    test = Test.where(col1: col1).first\r\n    test = Test.where(col2: col2).first if test.blank?\r\n    test = Test.where(col3: col3).first if test.blank?\r\n  end\r\nend\r\n<\/code><\/pre>\n<p>return\u304c\u554f\u984c\u306a\u3089\u3070\u3001\u3053\u308c\u3067\u4e0a\u624b\u304f\u884c\u304f\u306f\u305a\uff01<br \/>\n\u305d\u308c\u3067\u306f\u5b9f\u884c\u3057\u3066\u884c\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u7b2c\u4e00\u6b21<\/h3>\n<pre class=\"post-pre\"><code>[2] pry(main)&gt; get_testdata(\"test1\",\"test2\",\"test3\")\r\nCache read: test-test1-test2-test3 ({:expires_in=&gt;1800 seconds})\r\nCache generate: test-test1-test2-test3 ({:expires_in=&gt;1800 seconds})\r\n  Test Load (0.7ms)  SELECT  `tests`.* FROM `tests`  WHERE `tests`.`col1` = 'test1'  ORDER BY `tests`.`id` ASC LIMIT 1\r\n  Test Load (0.5ms)  SELECT  `tests`.* FROM `tests`  WHERE `tests`.`col2` = 'test2'  ORDER BY `tests`.`id` ASC LIMIT 1\r\n  Test Load (0.6ms)  SELECT  `tests`.* FROM `tests`  WHERE `tests`.`col3` = 'test3'  ORDER BY `tests`.`id` ASC LIMIT 1\r\nCache write: test-test1-test2-test3 ({:expires_in=&gt;1800 seconds})\r\n=&gt; #&lt;Test id: 1, col1: \"test3\", col2: \"test3\", col3: \"test3\"&gt;\r\n[3] pry(main)&gt; \r\n<\/code><\/pre>\n<p>\u9996\u6b21\u8fd0\u884c\u65f6\uff0cSQL\u4f1a\u50cf\u4e4b\u524d\u4e00\u6837\u88ab\u6267\u884c\u5e76\u4e14\u53ef\u4ee5\u83b7\u5f97\u6570\u636e\u3002<br \/>\n\u7531\u4e8e\u8f93\u51fa\u7ed3\u679c\u4e2d\u51fa\u73b0\u4e86\u201c\u7f13\u5b58\u5199\u5165\u201d\u5b57\u6837\uff0c\u8fd9\u770b\u8d77\u6765\u662f\u53ef\u4ee5\u671f\u5f85\u7684\u3002<\/p>\n<h3>\u7b2c\u4e8c\u6b21<\/h3>\n<pre class=\"post-pre\"><code>[3] pry(main)&gt; get_testdata(\"test1\",\"test2\",\"test3\")\r\nCache read: test-test1-test2-test3 ({:expires_in=&gt;1800 seconds})\r\nCache fetch_hit: test-test1-test2-test3 ({:expires_in=&gt;1800 seconds})\r\n=&gt; #&lt;Test id: 1, col1: \"test3\", col2: \"test3\", col3: \"test3\"&gt;\r\n[4] pry(main)&gt;\r\n<\/code><\/pre>\n<p>\u592a\u597d\u4e86\uff01\uff01\uff01<br \/>\n\u6210\u529f\u83b7\u53d6\u4e86\u6570\u636e\uff0c\u800c\u4e0d\u9700\u8981\u6267\u884cSQL\u8bed\u53e5\u3002<br \/>\n\u8fd9\u6837\u4e00\u6765\uff0c\u5728\u539f\u672c\u7684\u5904\u7406\u4e2d\uff0c\u7f13\u5b58\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\uff0c\u5e76\u4e14\u80fd\u591f\u5728\u4e0d\u8bbf\u95ee\u6570\u636e\u5e93\u7684\u60c5\u51b5\u4e0b\u83b7\u53d6\u6570\u636e\u3002<\/p>\n<h1>\u603b\u7ed3<\/h1>\n<p>\u5728\u4f7f\u7528Rails.cache.fetch\u65f6\uff0c\u5728\u6267\u884c\u5757\u5185\u4f7f\u7528return\u8bed\u53e5\u6765\u7ed3\u675f\u5904\u7406\uff0c\u786e\u8ba4\u6570\u636e\u4e0d\u4f1a\u4fdd\u5b58\u5728\u7f13\u5b58\u4e2d\u3002<\/p>\n<p>\u8d77\u521d\u6211\u5e76\u6ca1\u6709\u60f3\u5230\u53ea\u662f\u52a0\u4e0areturn\u8bed\u53e5\u5c31\u4f1a\u4f7f\u7f13\u5b58\u5931\u6548\u3002\u4ed4\u7ec6\u8003\u8651\u4e00\u4e0b\uff0c\u56e0\u4e3a\u5728\u6267\u884creturn\u7684\u65f6\u5019\u5c31\u4f1a\u9000\u51fa\u65b9\u6cd5\uff0c\u6240\u4ee5\u4e5f\u4f1a\u4ea7\u751f\u5173\u4e8e\u4ec0\u4e48\u88ab\u7f13\u5b58\u7684\u7591\u95ee&#8230; 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