{"id":160773,"date":"2024-11-04T00:53:21","date_gmt":"2024-11-03T16:53:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160773\/"},"modified":"2024-11-04T00:53:22","modified_gmt":"2024-11-03T16:53:22","slug":"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql-%e5%ae%9a%e7%be%a9%e6%a2%9d%e4%bb%b6%e5%92%8c%e8%99%95%e7%90%86%e7%a8%8b%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160773\/","title":{"rendered":"\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL \u5b9a\u7fa9\u689d\u4ef6\u548c\u8655\u7406\u7a0b\u5e8f"},"content":{"rendered":"

\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL \u5b9a\u7fa9\u689d\u4ef6\u548c\u8655\u7406\u7a0b\u5e8f<\/h1>\n

\u5728\u73fe\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0c\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08DBMS\uff09\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\u3002MySQL \u4f5c\u70ba\u4e00\u7a2e\u6d41\u884c\u7684\u958b\u6e90\u8cc7\u6599\u5eab\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u61c9\u7528\u7a0b\u5f0f\u4e2d\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e MySQL \u4e2d\u7684\u689d\u4ef6\u5b9a\u7fa9\u548c\u8655\u7406\u7a0b\u5e8f\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u5728\u8cc7\u6599\u5eab\u64cd\u4f5c\u4e2d\u4f7f\u7528\u9019\u4e9b\u529f\u80fd\u3002<\/p>\n

MySQL \u4e2d\u7684\u689d\u4ef6\u5b9a\u7fa9<\/h2>\n

\u5728 MySQL \u4e2d\uff0c\u689d\u4ef6\u5b9a\u7fa9\u4e3b\u8981\u7528\u65bc\u67e5\u8a62\u8a9e\u53e5\u4e2d\uff0c\u4ee5\u904e\u6ffe\u51fa\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u6578\u64da\u3002\u6700\u5e38\u898b\u7684\u689d\u4ef6\u5b9a\u7fa9\u662f\u4f7f\u7528 WHERE<\/code> \u5b50\u53e5\u3002\u9019\u500b\u5b50\u53e5\u5141\u8a31\u7528\u6236\u6307\u5b9a\u4e00\u500b\u6216\u591a\u500b\u689d\u4ef6\uff0c\u53ea\u6709\u6eff\u8db3\u9019\u4e9b\u689d\u4ef6\u7684\u8a18\u9304\u624d\u6703\u88ab\u9078\u53d6\u3002<\/p>\n

\u4f7f\u7528 WHERE \u5b50\u53e5<\/h3>\n

\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u4f8b\u5b50\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528 WHERE<\/code> \u5b50\u53e5\u4f86\u67e5\u8a62\u7279\u5b9a\u689d\u4ef6\u7684\u6578\u64da\uff1a<\/p>\n

SELECT * FROM customers WHERE country = 'Hong Kong';<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u4f86\u81ea\u9999\u6e2f\u7684\u5ba2\u6236\u8a18\u9304\u3002\u9664\u4e86\u7b49\u65bc\uff08=\uff09\u904b\u7b97\u7b26\u5916\uff0cMySQL \u9084\u652f\u6301\u5176\u4ed6\u904b\u7b97\u7b26\uff0c\u5982\u4e0d\u7b49\u65bc\uff08\uff09\u3001\u5927\u65bc\uff08>\uff09\u3001\u5c0f\u65bc\uff08<\uff09\u7b49\u3002<\/p>\n
\u8907\u96dc\u689d\u4ef6\u7684\u4f7f\u7528<\/h3>\n
\u7576\u9700\u8981\u67e5\u8a62\u66f4\u8907\u96dc\u7684\u689d\u4ef6\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u908f\u8f2f\u904b\u7b97\u7b26\uff0c\u5982 AND<\/code> \u548c OR<\/code>\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n
SELECT * FROM customers WHERE country = 'Hong Kong' AND age > 30;<\/code><\/pre>\n
\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u4f86\u81ea\u9999\u6e2f\u4e14\u5e74\u9f61\u5927\u65bc 30 \u6b72\u7684\u5ba2\u6236\u8a18\u9304\u3002<\/p>\n
MySQL \u4e2d\u7684\u8655\u7406\u7a0b\u5e8f<\/h2>\n
\u8655\u7406\u7a0b\u5e8f\uff08Stored Procedures\uff09\u662f MySQL \u4e2d\u7684\u4e00\u500b\u5f37\u5927\u529f\u80fd\uff0c\u5141\u8a31\u7528\u6236\u5c07\u4e00\u7d44 SQL \u8a9e\u53e5\u5c01\u88dd\u5728\u4e00\u8d77\uff0c\u4e26\u4ee5\u4e00\u500b\u55ae\u4e00\u7684\u540d\u7a31\u4f86\u8abf\u7528\u3002\u9019\u4e0d\u50c5\u63d0\u9ad8\u4e86\u4ee3\u78bc\u7684\u91cd\u7528\u6027\uff0c\u9084\u80fd\u7c21\u5316\u8907\u96dc\u7684\u64cd\u4f5c\u3002<\/p>\n
\u5275\u5efa\u8655\u7406\u7a0b\u5e8f<\/h3>\n
\u5275\u5efa\u8655\u7406\u7a0b\u5e8f\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
DELIMITER \/\/\nCREATE PROCEDURE procedure_name (parameters)\nBEGIN\n    -- SQL statements\nEND \/\/\nDELIMITER ;<\/code><\/pre>\n
\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u8655\u7406\u7a0b\u5e8f\u793a\u4f8b\uff0c\u8a72\u7a0b\u5e8f\u7528\u65bc\u67e5\u8a62\u7279\u5b9a\u570b\u5bb6\u7684\u5ba2\u6236\u6578\u91cf\uff1a<\/p>\n
DELIMITER \/\/\nCREATE PROCEDURE GetCustomerCount (IN countryName VARCHAR(50))\nBEGIN\n    SELECT COUNT(*) FROM customers WHERE country = countryName;\nEND \/\/\nDELIMITER ;<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba GetCustomerCount<\/code> \u7684\u8655\u7406\u7a0b\u5e8f\uff0c\u63a5\u53d7\u4e00\u500b\u570b\u5bb6\u540d\u7a31\u4f5c\u70ba\u53c3\u6578\uff0c\u4e26\u8fd4\u56de\u8a72\u570b\u5bb6\u7684\u5ba2\u6236\u6578\u91cf\u3002<\/p>\n
\u8abf\u7528\u8655\u7406\u7a0b\u5e8f<\/h3>\n
\u8abf\u7528\u8655\u7406\u7a0b\u5e8f\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
CALL GetCustomerCount('Hong Kong');<\/code><\/pre>\n
\u9019\u5c07\u8fd4\u56de\u4f86\u81ea\u9999\u6e2f\u7684\u5ba2\u6236\u6578\u91cf\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
MySQL \u7684\u689d\u4ef6\u5b9a\u7fa9\u548c\u8655\u7406\u7a0b\u5e8f\u529f\u80fd\u70ba\u8cc7\u6599\u5eab\u64cd\u4f5c\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u9748\u6d3b\u6027\u548c\u6548\u7387\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528 WHERE<\/code> \u5b50\u53e5\u548c\u8655\u7406\u7a0b\u5e8f\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u67e5\u8a62\u6578\u64da\u3002\u7121\u8ad6\u662f\u5728\u5c0f\u578b\u61c9\u7528\u9084\u662f\u5927\u578b\u7cfb\u7d71\u4e2d\uff0c\u9019\u4e9b\u529f\u80fd\u90fd\u80fd\u986f\u8457\u63d0\u9ad8\u8cc7\u6599\u5eab\u7684\u6027\u80fd\u548c\u53ef\u7dad\u8b77\u6027\u3002<\/p>\n
\u5982\u679c\u60a8\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528 \u9999\u6e2fVPS<\/a> \u4f86\u642d\u5efa\u60a8\u7684 MySQL \u74b0\u5883\uff0c\u4eab\u53d7\u66f4\u9ad8\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5b78\u7fd2MySQL\u8cc7\u6599\u5eab\u6559\u7a0b\uff0c\u638c\u63e1\u5b9a\u7fa9\u689d\u4ef6\u548c\u8655\u7406\u7a0b\u5e8f\u7684\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u8207\u67e5\u8a62\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-160773","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160773","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=160773"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160773\/revisions"}],"predecessor-version":[{"id":160774,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160773\/revisions\/160774"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160773"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160773"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160773"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}