{"id":76686,"date":"2024-10-16T08:58:13","date_gmt":"2024-10-16T00:58:13","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76686\/"},"modified":"2024-10-16T08:58:14","modified_gmt":"2024-10-16T00:58:14","slug":"mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b9%8bupdate%e6%9b%b4%e6%96%b0%e8%aa%9e%e5%8f%a5%e7%b2%be%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76686\/","title":{"rendered":"MySQL\u6578\u64da\u5eab\u4e4bUPDATE\u66f4\u65b0\u8a9e\u53e5\u7cbe\u89e3"},"content":{"rendered":"

MySQL\u6578\u64da\u5eab\u4e4bUPDATE\u66f4\u65b0\u8a9e\u53e5\u7cbe\u89e3<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5176\u5f37\u5927\u7684\u529f\u80fd\u548c\u9748\u6d3b\u6027\u4f7f\u5f97\u958b\u767c\u8005\u80fd\u5920\u9ad8\u6548\u5730\u7ba1\u7406\u6578\u64da\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u4e2d\u7684UPDATE\u8a9e\u53e5\uff0c\u5e6b\u52a9\u8b80\u8005\u7406\u89e3\u5982\u4f55\u6709\u6548\u5730\u66f4\u65b0\u6578\u64da\u3002<\/p>\n

UPDATE\u8a9e\u53e5\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n

UPDATE\u8a9e\u53e5\u7528\u65bc\u4fee\u6539\u6578\u64da\u8868\u4e2d\u7684\u73fe\u6709\u8a18\u9304\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

UPDATE \u8868\u540d\nSET \u52171 = \u503c1, \u52172 = \u503c2, ...\nWHERE \u689d\u4ef6;<\/code><\/pre>\n
\u5728\u9019\u88e1\uff0c\u8868\u540d<\/strong>\u662f\u8981\u66f4\u65b0\u7684\u6578\u64da\u8868\uff0c\u52171, \u52172<\/strong>\u662f\u9700\u8981\u66f4\u65b0\u7684\u5217\uff0c\u800c\u503c1, \u503c2<\/strong>\u662f\u65b0\u7684\u6578\u64da\u503c\u3002WHERE<\/strong>\u5b50\u53e5\u7528\u65bc\u6307\u5b9a\u54ea\u4e9b\u8a18\u9304\u9700\u8981\u88ab\u66f4\u65b0\uff0c\u9019\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u56e0\u70ba\u5982\u679c\u7701\u7565\u4e86\u9019\u500b\u5b50\u53e5\uff0c\u6240\u6709\u8a18\u9304\u90fd\u6703\u88ab\u66f4\u65b0\u3002<\/p>\n
UPDATE\u8a9e\u53e5\u7684\u4f7f\u7528\u793a\u4f8b<\/h2>\n
\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528UPDATE\u8a9e\u53e5\u4f86\u66f4\u65b0\u6578\u64da\uff1a<\/p>\n
UPDATE customers\nSET email = 'newemail@example.com'\nWHERE customer_id = 1;<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5c07\u5ba2\u6236ID\u70ba1\u7684\u5ba2\u6236\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u66f4\u65b0\u70ba\u65b0\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002<\/p>\n
\u591a\u5217\u66f4\u65b0<\/h3>\n
UPDATE\u8a9e\u53e5\u4e5f\u53ef\u4ee5\u540c\u6642\u66f4\u65b0\u591a\u500b\u5217\u3002\u4f8b\u5982\uff1a<\/p>\n
UPDATE products\nSET price = 19.99, stock = 50\nWHERE product_id = 10;<\/code><\/pre>\n
\u9019\u689d\u8a9e\u53e5\u5c07\u7522\u54c1ID\u70ba10\u7684\u7522\u54c1\u7684\u50f9\u683c\u66f4\u65b0\u70ba19.99\uff0c\u5eab\u5b58\u66f4\u65b0\u70ba50\u3002<\/p>\n
\u4f7f\u7528WHERE\u5b50\u53e5\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n
\u5728\u4f7f\u7528UPDATE\u8a9e\u53e5\u6642\uff0cWHERE<\/strong>\u5b50\u53e5\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u82e5\u4e0d\u52a0\u4ee5\u4f7f\u7528\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6574\u500b\u8868\u7684\u6578\u64da\u88ab\u4e0d\u5c0f\u5fc3\u66f4\u65b0\u3002\u4f8b\u5982\uff1a<\/p>\n
UPDATE users\nSET status = 'inactive';<\/code><\/pre>\n
\u9019\u689d\u8a9e\u53e5\u6703\u5c07\u6240\u6709\u7528\u6236\u7684\u72c0\u614b\u8a2d\u7f6e\u70ba’inactive’\uff0c\u9019\u901a\u5e38\u4e0d\u662f\u6211\u5011\u7684\u610f\u5716\u3002\u56e0\u6b64\uff0c\u5efa\u8b70\u5728\u57f7\u884cUPDATE\u8a9e\u53e5\u4e4b\u524d\uff0c\u5148\u4f7f\u7528SELECT\u8a9e\u53e5\u78ba\u8a8d\u5c07\u8981\u66f4\u65b0\u7684\u8a18\u9304\u3002<\/p>\n
\u4f7f\u7528LIMIT\u9650\u5236\u66f4\u65b0\u7684\u8a18\u9304\u6578<\/h2>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u53ea\u60f3\u66f4\u65b0\u7279\u5b9a\u6578\u91cf\u7684\u8a18\u9304\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528LIMIT<\/strong>\u5b50\u53e5\u3002\u4f8b\u5982\uff1a<\/p>\n
UPDATE orders\nSET status = 'shipped'\nWHERE status = 'pending'\nLIMIT 5;<\/code><\/pre>\n
\u9019\u689d\u8a9e\u53e5\u5c07\u53ea\u66f4\u65b0\u524d\u4e94\u689d\u72c0\u614b\u70ba’pending’\u7684\u8a02\u55ae\u3002<\/p>\n
\u4e8b\u52d9\u8655\u7406\u8207ROLLBACK<\/h2>\n
\u5728\u9032\u884c\u591a\u689dUPDATE\u64cd\u4f5c\u6642\uff0c\u4f7f\u7528\u4e8b\u52d9\u8655\u7406\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528START TRANSACTION<\/strong>\u4f86\u958b\u59cb\u4e00\u500b\u4e8b\u52d9\uff0c\u4e26\u5728\u9700\u8981\u6642\u4f7f\u7528ROLLBACK<\/strong>\u4f86\u64a4\u92b7\u64cd\u4f5c\u3002\u4f8b\u5982\uff1a<\/p>\n
START TRANSACTION;\n\nUPDATE accounts\nSET balance = balance - 100\nWHERE account_id = 1;\n\nUPDATE accounts\nSET balance = balance + 100\nWHERE account_id = 2;\n\nCOMMIT;<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5f9e\u4e00\u500b\u8cec\u6236\u6263\u9664100\uff0c\u4e26\u5c07\u5176\u6dfb\u52a0\u5230\u53e6\u4e00\u500b\u8cec\u6236\u3002\u5982\u679c\u5728\u57f7\u884c\u904e\u7a0b\u4e2d\u51fa\u73fe\u932f\u8aa4\uff0c\u53ef\u4ee5\u4f7f\u7528ROLLBACK\u4f86\u64a4\u92b7\u6240\u6709\u64cd\u4f5c\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
MySQL\u7684UPDATE\u8a9e\u53e5\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u9748\u6d3b\u5730\u7ba1\u7406\u6578\u64da\u3002\u901a\u904e\u6b63\u78ba\u4f7f\u7528UPDATE\u8a9e\u53e5\u53ca\u5176\u76f8\u95dc\u529f\u80fd\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u66f4\u65b0\u6578\u64da\uff0c\u4fdd\u6301\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u6e96\u78ba\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u82e5\u60a8\u5c0d\u65bcVPS\u6216\u5176\u4ed6\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u611f\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\uff0c\u63a2\u7d22\u6211\u5011\u7684\u9999\u6e2fVPS<\/a>\u548c\u4e91\u670d\u52a1\u5668<\/a>\u9078\u64c7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6df1\u5165\u89e3\u6790MySQL\u6578\u64da\u5eab\u7684UPDATE\u66f4\u65b0\u8a9e\u53e5\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u5730\u4fee\u6539\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6280\u80fd\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-76686","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76686","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=76686"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76686\/revisions"}],"predecessor-version":[{"id":76687,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76686\/revisions\/76687"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76686"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76686"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76686"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}