{"id":141947,"date":"2024-10-31T22:14:18","date_gmt":"2024-10-31T14:14:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/141947\/"},"modified":"2024-10-31T22:14:18","modified_gmt":"2024-10-31T14:14:18","slug":"sql-%e8%a8%ad%e8%a8%88%e6%a8%a1%e5%bc%8f-%e9%97%9c%e4%bf%82%e5%9e%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e5%b9%82%e7%ad%89%e6%80%a7%e8%99%95%e7%90%86","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/141947\/","title":{"rendered":"SQL \u8a2d\u8a08\u6a21\u5f0f | \u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7684\u5e42\u7b49\u6027\u8655\u7406"},"content":{"rendered":"<h1 id=\"sql-%e8%a8%ad%e8%a8%88%e6%a8%a1%e5%bc%8f-%e9%97%9c%e4%bf%82%e5%9e%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e5%b9%82%e7%ad%89%e6%80%a7%e8%99%95%e7%90%86-ZVzDFEpEcn\">SQL \u8a2d\u8a08\u6a21\u5f0f | \u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7684\u5e42\u7b49\u6027\u8655\u7406<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0c\u95dc\u4fc2\u578b\u6578\u64da\u5eab\uff08RDBMS\uff09\u4ecd\u7136\u662f\u8a31\u591a\u61c9\u7528\u7a0b\u5e8f\u7684\u6838\u5fc3\u3002\u96a8\u8457\u7cfb\u7d71\u7684\u8907\u96dc\u6027\u589e\u52a0\uff0c\u5982\u4f55\u8a2d\u8a08\u4e00\u500b\u9ad8\u6548\u4e14\u53ef\u9760\u7684\u6578\u64da\u5eab\u67b6\u69cb\u8b8a\u5f97\u81f3\u95dc\u91cd\u8981\u3002\u672c\u6587\u5c07\u63a2\u8a0e SQL \u8a2d\u8a08\u6a21\u5f0f\u4e2d\u7684\u5e42\u7b49\u6027\u8655\u7406\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u5efa\u8b70\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%b9%82%e7%ad%89%e6%80%a7%ef%bc%9f-ZVzDFEpEcn\">\u4ec0\u9ebc\u662f\u5e42\u7b49\u6027\uff1f<\/h2>\n<p>\u5e42\u7b49\u6027\u662f\u6307\u4e00\u500b\u64cd\u4f5c\u53ef\u4ee5\u91cd\u8907\u57f7\u884c\u591a\u6b21\uff0c\u800c\u4e0d\u6703\u6539\u8b8a\u7cfb\u7d71\u7684\u6700\u7d42\u72c0\u614b\u3002\u5728\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\uff0c\u9019\u610f\u5473\u8457\u5373\u4f7f\u540c\u4e00\u689d SQL \u8a9e\u53e5\u88ab\u57f7\u884c\u591a\u6b21\uff0c\u6578\u64da\u5eab\u7684\u72c0\u614b\u4e5f\u4e0d\u6703\u767c\u751f\u8b8a\u5316\u3002\u9019\u5728\u8655\u7406\u7db2\u7d61\u8acb\u6c42\u6216\u91cd\u8a66\u6a5f\u5236\u6642\u5c24\u70ba\u91cd\u8981\uff0c\u56e0\u70ba\u5b83\u53ef\u4ee5\u9632\u6b62\u56e0\u91cd\u8907\u57f7\u884c\u64cd\u4f5c\u800c\u5c0e\u81f4\u7684\u6578\u64da\u4e0d\u4e00\u81f4\u6027\u3002<\/p>\n<h2 id=\"%e5%b9%82%e7%ad%89%e6%80%a7%e5%9c%a8-sql-%e8%a8%ad%e8%a8%88%e4%b8%ad%e7%9a%84%e9%87%8d%e8%a6%81%e6%80%a7-ZVzDFEpEcn\">\u5e42\u7b49\u6027\u5728 SQL \u8a2d\u8a08\u4e2d\u7684\u91cd\u8981\u6027<\/h2>\n<p>\u5728\u8a2d\u8a08\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u6642\uff0c\u8003\u616e\u5e42\u7b49\u6027\u53ef\u4ee5\u63d0\u9ad8\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u548c\u53ef\u9760\u6027\u3002\u4ee5\u4e0b\u662f\u5e7e\u500b\u5e42\u7b49\u6027\u7684\u91cd\u8981\u6027\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u4e00\u81f4\u6027\uff1a<\/strong>\u5e42\u7b49\u6027\u78ba\u4fdd\u4e86\u5373\u4f7f\u5728\u51fa\u73fe\u932f\u8aa4\u6216\u91cd\u8a66\u7684\u60c5\u6cc1\u4e0b\uff0c\u6578\u64da\u7684\u6700\u7d42\u72c0\u614b\u4ecd\u7136\u662f\u4e00\u81f4\u7684\u3002<\/li>\n<li><strong>\u7c21\u5316\u932f\u8aa4\u8655\u7406\uff1a<\/strong>\u7576\u64cd\u4f5c\u662f\u5e42\u7b49\u7684\u6642\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u8f15\u9b06\u5730\u8655\u7406\u932f\u8aa4\uff0c\u56e0\u70ba\u91cd\u8a66\u64cd\u4f5c\u4e0d\u6703\u5c0e\u81f4\u610f\u5916\u7684\u526f\u4f5c\u7528\u3002<\/li>\n<li><strong>\u63d0\u9ad8\u7cfb\u7d71\u53ef\u7528\u6027\uff1a<\/strong>\u5728\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\uff0c\u5e42\u7b49\u6027\u53ef\u4ee5\u6e1b\u5c11\u56e0\u7db2\u7d61\u554f\u984c\u5c0e\u81f4\u7684\u6578\u64da\u4e0d\u4e00\u81f4\u6027\uff0c\u5f9e\u800c\u63d0\u9ad8\u7cfb\u7d71\u7684\u53ef\u7528\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%af%a6%e7%8f%be-sql-%e7%9a%84%e5%b9%82%e7%ad%89%e6%80%a7-ZVzDFEpEcn\">\u5982\u4f55\u5be6\u73fe SQL \u7684\u5e42\u7b49\u6027<\/h2>\n<p>\u5be6\u73fe SQL \u7684\u5e42\u7b49\u6027\u53ef\u4ee5\u901a\u904e\u591a\u7a2e\u65b9\u5f0f\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f-ZVzDFEpEcn\">1. \u4f7f\u7528\u552f\u4e00\u7d04\u675f<\/h3>\n<p>\u5728\u6578\u64da\u8868\u4e2d\u8a2d\u7f6e\u552f\u4e00\u7d04\u675f\u53ef\u4ee5\u9632\u6b62\u91cd\u8907\u63d2\u5165\u76f8\u540c\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u7528\u6236\u8868\uff0c\u4e26\u5e0c\u671b\u78ba\u4fdd\u6bcf\u500b\u7528\u6236\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u662f\u552f\u4e00\u7684\uff1a<\/p>\n<pre><code>CREATE TABLE users (\n    id INT PRIMARY KEY AUTO_INCREMENT,\n    email VARCHAR(255) UNIQUE,\n    name VARCHAR(100)\n);<\/code><\/pre>\n<p>\u5728\u63d2\u5165\u7528\u6236\u6642\uff0c\u5982\u679c\u96fb\u5b50\u90f5\u4ef6\u5df2\u5b58\u5728\uff0c\u5247\u6703\u5f15\u767c\u932f\u8aa4\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u4e0d\u6703\u91cd\u8907\u63d2\u5165\u76f8\u540c\u7684\u7528\u6236\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8-upsert-%e6%93%8d%e4%bd%9c-ZVzDFEpEcn\">2. \u4f7f\u7528 UPSERT \u64cd\u4f5c<\/h3>\n<p>UPSERT \u662f\u4e00\u7a2e\u7d50\u5408\u63d2\u5165\u548c\u66f4\u65b0\u7684\u64cd\u4f5c\uff0c\u7576\u8a18\u9304\u4e0d\u5b58\u5728\u6642\u63d2\u5165\uff0c\u7576\u8a18\u9304\u5df2\u5b58\u5728\u6642\u66f4\u65b0\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u64cd\u4f5c\u7684\u5e42\u7b49\u6027\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>INSERT INTO users (email, name)\nVALUES ('example@example.com', 'John Doe')\nON DUPLICATE KEY UPDATE name = 'John Doe';<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u64cd\u4f5c\u78ba\u4fdd\u4e86\u7121\u8ad6\u57f7\u884c\u591a\u5c11\u6b21\uff0c\u6700\u7d42\u7684\u7d50\u679c\u90fd\u662f\u4e00\u81f4\u7684\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e4%ba%8b%e5%8b%99-ZVzDFEpEcn\">3. \u4f7f\u7528\u4e8b\u52d9<\/h3>\n<p>\u5728\u9032\u884c\u591a\u500b SQL \u64cd\u4f5c\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e8b\u52d9\u4f86\u78ba\u4fdd\u64cd\u4f5c\u7684\u539f\u5b50\u6027\u3002\u9019\u610f\u5473\u8457\u8981\u9ebc\u6240\u6709\u64cd\u4f5c\u90fd\u6210\u529f\uff0c\u8981\u9ebc\u90fd\u4e0d\u57f7\u884c\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>START TRANSACTION;\n\nINSERT INTO users (email, name) VALUES ('example@example.com', 'John Doe');\nUPDATE users SET name = 'Jane Doe' WHERE email = 'example@example.com';\n\nCOMMIT;<\/code><\/pre>\n<p>\u5982\u679c\u5728\u4e8b\u52d9\u4e2d\u51fa\u73fe\u932f\u8aa4\uff0c\u5247\u53ef\u4ee5\u56de\u6efe\u6240\u6709\u64cd\u4f5c\uff0c\u5f9e\u800c\u4fdd\u6301\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-ZVzDFEpEcn\">\u7d50\u8ad6<\/h2>\n<p>\u5e42\u7b49\u6027\u5728 SQL \u8a2d\u8a08\u6a21\u5f0f\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u89d2\u8272\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u6642\u3002\u901a\u904e\u4f7f\u7528\u552f\u4e00\u7d04\u675f\u3001UPSERT \u64cd\u4f5c\u548c\u4e8b\u52d9\u7b49\u6280\u8853\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u5be6\u73fe\u5e42\u7b49\u6027\uff0c\u5f9e\u800c\u63d0\u9ad8\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u548c\u53ef\u9760\u6027\u3002\u5c0d\u65bc\u5e0c\u671b\u5728\u9999\u6e2f\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u89e3\u6c7a\u65b9\u6848\u7684\u4f01\u696d\uff0c\u4e86\u89e3\u9019\u4e9b\u8a2d\u8a08\u6a21\u5f0f\u5c07\u662f\u975e\u5e38\u6709\u76ca\u7684\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u548c\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 SQL \u8a2d\u8a08\u6a21\u5f0f\u53ca\u5176\u5728\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u4e2d\u7684\u5e42\u7b49\u6027\u8655\u7406\uff0c\u63d0\u5347\u6578\u64da\u4e00\u81f4\u6027\u8207\u7cfb\u7d71\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-141947","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141947","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=141947"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141947\/revisions"}],"predecessor-version":[{"id":141948,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141947\/revisions\/141948"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=141947"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=141947"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=141947"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}