{"id":157744,"date":"2024-11-02T23:36:25","date_gmt":"2024-11-02T15:36:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/157744\/"},"modified":"2024-11-02T23:36:26","modified_gmt":"2024-11-02T15:36:26","slug":"%e9%ab%98%e6%95%88%e4%be%bf%e6%8d%b7%ef%bc%8c%e5%bf%ab%e9%80%9f%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a%ef%bc%9a%e6%95%b8%e6%93%9a%e5%ba%ab%e6%89%b9%e9%87%8f%e6%94%b9%e6%95%b8%e6%93%9a%e8%aa%9e%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/157744\/","title":{"rendered":"\u9ad8\u6548\u4fbf\u6377\uff0c\u5feb\u901f\u4fee\u6539\u6578\u64da\uff1a\u6578\u64da\u5eab\u6279\u91cf\u6539\u6578\u64da\u8a9e\u53e5\uff08\u6578\u64da\u5eab\u6279\u91cf\u6539\u6578\u64da\u8a9e\u53e5\uff09"},"content":{"rendered":"<h1 id=\"%e9%ab%98%e6%95%88%e4%be%bf%e6%8d%b7%ef%bc%8c%e5%bf%ab%e9%80%9f%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a%ef%bc%9a%e6%95%b8%e6%93%9a%e5%ba%ab%e6%89%b9%e9%87%8f%e6%94%b9%e6%95%b8%e6%93%9a%e8%aa%9e%e5%8f%a5-PrcWIsZdKw\">\u9ad8\u6548\u4fbf\u6377\uff0c\u5feb\u901f\u4fee\u6539\u6578\u64da\uff1a\u6578\u64da\u5eab\u6279\u91cf\u6539\u6578\u64da\u8a9e\u53e5<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u64cd\u4f5c\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002\u7121\u8ad6\u662f\u4f01\u696d\u9084\u662f\u500b\u4eba\u7528\u6236\uff0c\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u53ca\u6642\u6027\u90fd\u5c0d\u696d\u52d9\u904b\u71df\u81f3\u95dc\u91cd\u8981\u3002\u7576\u9700\u8981\u5c0d\u5927\u91cf\u6578\u64da\u9032\u884c\u4fee\u6539\u6642\uff0c\u624b\u52d5\u64cd\u4f5c\u4e0d\u50c5\u8017\u6642\uff0c\u9084\u5bb9\u6613\u51fa\u932f\u3002\u56e0\u6b64\uff0c\u4f7f\u7528\u6578\u64da\u5eab\u6279\u91cf\u6539\u6578\u64da\u8a9e\u53e5\u6210\u70ba\u4e86\u4e00\u7a2e\u9ad8\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%ba%ab%e6%89%b9%e9%87%8f%e6%94%b9%e6%95%b8%e6%93%9a%e8%aa%9e%e5%8f%a5%ef%bc%9f-PrcWIsZdKw\">\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u6279\u91cf\u6539\u6578\u64da\u8a9e\u53e5\uff1f<\/h2>\n<p>\u6578\u64da\u5eab\u6279\u91cf\u6539\u6578\u64da\u8a9e\u53e5\u662f\u6307\u4e00\u7d44\u7528\u65bc\u540c\u6642\u4fee\u6539\u591a\u689d\u6578\u64da\u8a18\u9304\u7684SQL\u8a9e\u53e5\u3002\u9019\u4e9b\u8a9e\u53e5\u53ef\u4ee5\u5728\u4e00\u500b\u64cd\u4f5c\u4e2d\u5c0d\u591a\u500b\u8a18\u9304\u9032\u884c\u66f4\u65b0\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u8655\u7406\u7684\u6548\u7387\u3002\u5e38\u898b\u7684\u6279\u91cf\u4fee\u6539\u8a9e\u53e5\u5305\u62ec\u4f7f\u7528 <code>UPDATE<\/code> \u548c <code>INSERT<\/code> \u8a9e\u53e5\u3002<\/p>\n<h2>\u4f7f\u7528 <code>UPDATE<\/code> \u8a9e\u53e5\u9032\u884c\u6279\u91cf\u4fee\u6539<\/h2>\n<p>\u5728SQL\u4e2d\uff0c<code>UPDATE<\/code> \u8a9e\u53e5\u662f\u7528\u4f86\u4fee\u6539\u73fe\u6709\u8a18\u9304\u7684\u3002\u7576\u9700\u8981\u5c0d\u591a\u689d\u8a18\u9304\u9032\u884c\u76f8\u540c\u7684\u4fee\u6539\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>WHERE<\/code> \u5b50\u53e5\u4f86\u6307\u5b9a\u689d\u4ef6\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>UPDATE customers\nSET status = 'active'\nWHERE last_purchase_date &gt; '2023-01-01';<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6240\u6709\u57282023\u5e741\u67081\u65e5\u4e4b\u5f8c\u6709\u904e\u8cfc\u8cb7\u7684\u5ba2\u6236\u7684\u72c0\u614b\u90fd\u6703\u88ab\u66f4\u65b0\u70ba\u201cactive\u201d\u3002\u9019\u6a23\u7684\u6279\u91cf\u64cd\u4f5c\u4e0d\u50c5\u7bc0\u7701\u4e86\u6642\u9593\uff0c\u9084\u6e1b\u5c11\u4e86\u624b\u52d5\u64cd\u4f5c\u7684\u932f\u8aa4\u3002<\/p>\n<h2>\u4f7f\u7528 <code>INSERT<\/code> \u8a9e\u53e5\u9032\u884c\u6279\u91cf\u63d2\u5165<\/h2>\n<p>\u9664\u4e86\u66f4\u65b0\u6578\u64da\uff0c<code>INSERT<\/code> \u8a9e\u53e5\u4e5f\u53ef\u4ee5\u7528\u4f86\u6279\u91cf\u63d2\u5165\u6578\u64da\u3002\u9019\u5728\u9700\u8981\u5c07\u5927\u91cf\u6578\u64da\u5f9e\u4e00\u500b\u8868\u8f49\u79fb\u5230\u53e6\u4e00\u500b\u8868\u6642\u7279\u5225\u6709\u7528\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u6279\u91cf\u63d2\u5165\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>INSERT INTO orders (customer_id, order_date, amount)\nVALUES\n(1, '2023-10-01', 100),\n(2, '2023-10-02', 150),\n(3, '2023-10-03', 200);<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u4e09\u689d\u65b0\u8a02\u55ae\u540c\u6642\u63d2\u5165\u5230 <code>orders<\/code> \u8868\u4e2d\uff0c\u9019\u6a23\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u6578\u64da\u63d2\u5165\u7684\u6548\u7387\u3002<\/p>\n<h2>\u4f7f\u7528 <code>CASE<\/code> \u8a9e\u53e5\u9032\u884c\u689d\u4ef6\u66f4\u65b0<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u6839\u64da\u4e0d\u540c\u7684\u689d\u4ef6\u5c0d\u6578\u64da\u9032\u884c\u4e0d\u540c\u7684\u4fee\u6539\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528 <code>CASE<\/code> \u8a9e\u53e5\u4f86\u5be6\u73fe\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>UPDATE products\nSET price = CASE\n    WHEN category = 'A' THEN price * 1.1\n    WHEN category = 'B' THEN price * 1.2\n    ELSE price\nEND\nWHERE price &lt; 100;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u6839\u64da\u7522\u54c1\u7684\u985e\u5225\u5c0d\u50f9\u683c\u9032\u884c\u4e0d\u540c\u7684\u8abf\u6574\uff0c\u4e26\u4e14\u53ea\u91dd\u5c0d\u50f9\u683c\u4f4e\u65bc100\u7684\u7522\u54c1\u9032\u884c\u66f4\u65b0\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-PrcWIsZdKw\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u5728\u57f7\u884c\u6279\u91cf\u4fee\u6539\u64cd\u4f5c\u4e4b\u524d\uff0c\u5efa\u8b70\u5148\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u640d\u5931\u3002<\/li>\n<li>\u5728\u9032\u884c\u5927\u898f\u6a21\u66f4\u65b0\u6642\uff0c\u61c9\u8003\u616e\u6578\u64da\u5eab\u7684\u6027\u80fd\uff0c\u907f\u514d\u5728\u9ad8\u5cf0\u671f\u9032\u884c\u64cd\u4f5c\u3002<\/li>\n<li>\u4f7f\u7528 <code>BEGIN TRANSACTION<\/code> \u548c <code>ROLLBACK<\/code> \u53ef\u4ee5\u78ba\u4fdd\u64cd\u4f5c\u7684\u539f\u5b50\u6027\uff0c\u907f\u514d\u90e8\u5206\u66f4\u65b0\u6210\u529f\u800c\u90e8\u5206\u5931\u6557\u7684\u60c5\u6cc1\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-PrcWIsZdKw\">\u7e3d\u7d50<\/h2>\n<p>\u6578\u64da\u5eab\u6279\u91cf\u6539\u6578\u64da\u8a9e\u53e5\u662f\u4e00\u7a2e\u9ad8\u6548\u4fbf\u6377\u7684\u6578\u64da\u7ba1\u7406\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u4fee\u6539\u5927\u91cf\u6578\u64da\u3002\u901a\u904e\u4f7f\u7528 <code>UPDATE<\/code>\u3001<code>INSERT<\/code> \u548c <code>CASE<\/code> \u8a9e\u53e5\uff0c\u7528\u6236\u53ef\u4ee5\u5728\u77ed\u6642\u9593\u5167\u5b8c\u6210\u8907\u96dc\u7684\u6578\u64da\u64cd\u4f5c\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u6216 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u53ef\u4ee5\u9032\u4e00\u6b65\u63d0\u5347\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9ad8\u6548\u4fbf\u6377\u7684\u6578\u64da\u5eab\u6279\u91cf\u6539\u6578\u64da\u8a9e\u53e5\uff0c\u5feb\u901f\u4fee\u6539\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u7c21\u5316\u64cd\u4f5c\u6d41\u7a0b\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-157744","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/157744","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=157744"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/157744\/revisions"}],"predecessor-version":[{"id":157745,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/157744\/revisions\/157745"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=157744"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=157744"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=157744"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}