{"id":75784,"date":"2024-10-16T01:12:15","date_gmt":"2024-10-15T17:12:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/75784\/"},"modified":"2024-10-16T01:12:15","modified_gmt":"2024-10-15T17:12:15","slug":"mysql-%e6%8f%92%e5%85%a5%e6%99%82%e5%94%af%e4%b8%80%e9%8d%b5%e8%a1%9d%e7%aa%81%e7%9a%84%e5%b9%be%e7%a8%ae%e8%99%95%e7%90%86%e6%96%b9%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/75784\/","title":{"rendered":"MySQL \u63d2\u5165\u6642\u552f\u4e00\u9375\u885d\u7a81\u7684\u5e7e\u7a2e\u8655\u7406\u65b9\u5f0f"},"content":{"rendered":"

MySQL \u63d2\u5165\u6642\u552f\u4e00\u9375\u885d\u7a81\u7684\u5e7e\u7a2e\u8655\u7406\u65b9\u5f0f<\/h1>\n

\u5728\u4f7f\u7528 MySQL \u6578\u64da\u5eab\u6642\uff0c\u552f\u4e00\u9375\uff08UNIQUE KEY\uff09\u662f\u4e00\u500b\u91cd\u8981\u7684\u7d04\u675f\u689d\u4ef6\uff0c\u7528\u65bc\u78ba\u4fdd\u6578\u64da\u7684\u552f\u4e00\u6027\u3002\u7136\u800c\uff0c\u5728\u63d2\u5165\u6578\u64da\u6642\uff0c\u53ef\u80fd\u6703\u9047\u5230\u552f\u4e00\u9375\u885d\u7a81\u7684\u60c5\u6cc1\u3002\u9019\u7a2e\u60c5\u6cc1\u901a\u5e38\u6703\u5c0e\u81f4\u63d2\u5165\u64cd\u4f5c\u5931\u6557\uff0c\u4e26\u8fd4\u56de\u932f\u8aa4\u4fe1\u606f\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5e7e\u7a2e\u8655\u7406 MySQL \u63d2\u5165\u6642\u552f\u4e00\u9375\u885d\u7a81\u7684\u65b9\u5f0f\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u3002<\/p>\n

1. \u4f7f\u7528 INSERT IGNORE<\/h2>\n

\u7576\u4f7f\u7528 INSERT IGNORE<\/code> \u8a9e\u53e5\u6642\uff0c\u5982\u679c\u63d2\u5165\u7684\u6578\u64da\u5c0e\u81f4\u552f\u4e00\u9375\u885d\u7a81\uff0cMySQL \u5c07\u6703\u5ffd\u7565\u8a72\u63d2\u5165\u64cd\u4f5c\uff0c\u800c\u4e0d\u6703\u8fd4\u56de\u932f\u8aa4\u3002\u9019\u7a2e\u65b9\u5f0f\u9069\u5408\u65bc\u4e0d\u9700\u8981\u5c0d\u885d\u7a81\u6578\u64da\u9032\u884c\u4efb\u4f55\u8655\u7406\u7684\u60c5\u6cc1\u3002<\/p>\n

INSERT IGNORE INTO users (id, username) VALUES (1, 'user1');<\/code><\/pre>\n
\u5982\u679c id<\/code> \u70ba 1 \u7684\u7528\u6236\u5df2\u7d93\u5b58\u5728\uff0c\u5247\u8a72\u63d2\u5165\u64cd\u4f5c\u5c07\u88ab\u5ffd\u7565\u3002<\/p>\n
2. \u4f7f\u7528 REPLACE INTO<\/h2>\n
\u53e6\u4e00\u7a2e\u8655\u7406\u552f\u4e00\u9375\u885d\u7a81\u7684\u65b9\u5f0f\u662f\u4f7f\u7528 REPLACE INTO<\/code> \u8a9e\u53e5\u3002\u9019\u500b\u8a9e\u53e5\u7684\u4f5c\u7528\u662f\uff1a\u5982\u679c\u63d2\u5165\u7684\u6578\u64da\u5c0e\u81f4\u552f\u4e00\u9375\u885d\u7a81\uff0c\u5247\u5148\u522a\u9664\u5df2\u5b58\u5728\u7684\u884c\uff0c\u7136\u5f8c\u63d2\u5165\u65b0\u7684\u884c\u3002<\/p>\n
REPLACE INTO users (id, username) VALUES (1, 'user1');<\/code><\/pre>\n
\u9019\u6a23\uff0c\u5982\u679c id<\/code> \u70ba 1 \u7684\u7528\u6236\u5df2\u7d93\u5b58\u5728\uff0c\u5247\u6703\u5148\u522a\u9664\u8a72\u7528\u6236\uff0c\u7136\u5f8c\u63d2\u5165\u65b0\u7684\u7528\u6236\u6578\u64da\u3002<\/p>\n
3. \u4f7f\u7528 ON DUPLICATE KEY UPDATE<\/h2>\n
\u4f7f\u7528 ON DUPLICATE KEY UPDATE<\/code> \u8a9e\u53e5\u53ef\u4ee5\u5728\u63d2\u5165\u6642\u8655\u7406\u552f\u4e00\u9375\u885d\u7a81\uff0c\u4e26\u6839\u64da\u9700\u8981\u66f4\u65b0\u5df2\u5b58\u5728\u7684\u884c\u3002\u9019\u7a2e\u65b9\u5f0f\u975e\u5e38\u9748\u6d3b\uff0c\u9069\u5408\u9700\u8981\u66f4\u65b0\u6578\u64da\u7684\u60c5\u6cc1\u3002<\/p>\n
INSERT INTO users (id, username) VALUES (1, 'user1')\nON DUPLICATE KEY UPDATE username = 'user1_updated';<\/code><\/pre>\n
\u5982\u679c id<\/code> \u70ba 1 \u7684\u7528\u6236\u5df2\u7d93\u5b58\u5728\uff0c\u5247\u6703\u66f4\u65b0\u8a72\u7528\u6236\u7684 username<\/code> \u70ba ‘user1_updated’\u3002<\/p>\n
4. \u4f7f\u7528\u4e8b\u52d9\u8655\u7406<\/h2>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528\u4e8b\u52d9\u8655\u7406\u53ef\u4ee5\u66f4\u597d\u5730\u7ba1\u7406\u552f\u4e00\u9375\u885d\u7a81\u3002\u901a\u904e\u5c07\u63d2\u5165\u64cd\u4f5c\u653e\u5728\u4e8b\u52d9\u4e2d\uff0c\u53ef\u4ee5\u5728\u767c\u751f\u885d\u7a81\u6642\u9032\u884c\u56de\u6efe\uff0c\u5f9e\u800c\u4fdd\u6301\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/p>\n
START TRANSACTION;\nINSERT INTO users (id, username) VALUES (1, 'user1');\nIF (ROW_COUNT() = 0) THEN\n    -- \u8655\u7406\u885d\u7a81\uff0c\u4f8b\u5982\u66f4\u65b0\u6216\u8a18\u9304\u932f\u8aa4\nEND IF;\nCOMMIT;<\/code><\/pre>\n
\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u5728\u63d2\u5165\u904e\u7a0b\u4e2d\uff0c\u6578\u64da\u7684\u5b8c\u6574\u6027\u4e0d\u6703\u53d7\u5230\u5f71\u97ff\u3002<\/p>\n
5. \u6aa2\u67e5\u6578\u64da\u5b58\u5728\u6027<\/h2>\n
\u5728\u63d2\u5165\u6578\u64da\u4e4b\u524d\uff0c\u5148\u6aa2\u67e5\u6578\u64da\u662f\u5426\u5df2\u5b58\u5728\u4e5f\u662f\u4e00\u7a2e\u5e38\u898b\u7684\u505a\u6cd5\u3002\u9019\u53ef\u4ee5\u901a\u904e\u67e5\u8a62\u4f86\u5be6\u73fe\uff0c\u96d6\u7136\u9019\u6a23\u6703\u589e\u52a0\u984d\u5916\u7684\u67e5\u8a62\u958b\u92b7\uff0c\u4f46\u53ef\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u885d\u7a81\u3002<\/p>\n
SELECT COUNT(*) FROM users WHERE id = 1;<\/code><\/pre>\n
\u5982\u679c\u67e5\u8a62\u7d50\u679c\u70ba 0\uff0c\u5247\u53ef\u4ee5\u5b89\u5168\u5730\u9032\u884c\u63d2\u5165\u64cd\u4f5c\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728 MySQL \u4e2d\u8655\u7406\u552f\u4e00\u9375\u885d\u7a81\u7684\u65b9\u5f0f\u6709\u591a\u7a2e\uff0c\u5305\u62ec\u4f7f\u7528 INSERT IGNORE<\/code>\u3001REPLACE INTO<\/code>\u3001ON DUPLICATE KEY UPDATE<\/code>\u3001\u4e8b\u52d9\u8655\u7406\u4ee5\u53ca\u6aa2\u67e5\u6578\u64da\u5b58\u5728\u6027\u7b49\u3002\u6839\u64da\u5177\u9ad4\u7684\u696d\u52d9\u9700\u6c42\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u9078\u64c7\u6700\u5408\u9069\u7684\u65b9\u5f0f\u4f86\u7ba1\u7406\u6578\u64da\u5eab\u4e2d\u7684\u552f\u4e00\u9375\u885d\u7a81\u554f\u984c\u3002\u4e86\u89e3\u9019\u4e9b\u8655\u7406\u65b9\u5f0f\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u6548\u7387\uff0c\u9084\u80fd\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002<\/p>\n
\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc \u9999\u6e2fVPS<\/a> \u548c\u6578\u64da\u5eab\u7ba1\u7406\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22 MySQL \u63d2\u5165\u6642\u552f\u4e00\u9375\u885d\u7a81\u7684\u5e7e\u7a2e\u8655\u7406\u65b9\u5f0f\uff0c\u5305\u62ec\u66ff\u63db\u3001\u5ffd\u7565\u548c\u66f4\u65b0\u7b56\u7565\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\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-75784","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75784","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=75784"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75784\/revisions"}],"predecessor-version":[{"id":75785,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75784\/revisions\/75785"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=75784"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=75784"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=75784"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}