{"id":179820,"date":"2024-11-09T05:04:16","date_gmt":"2024-11-08T21:04:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179820\/"},"modified":"2024-11-09T05:04:17","modified_gmt":"2024-11-08T21:04:17","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%89%b5%e5%bb%ba%e8%ae%8a%e9%87%8f-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e4%b8%80%e5%80%8b%e8%ae%8a%e9%87%8f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179820\/","title":{"rendered":"\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u5275\u5efa\u8b8a\u91cf (\u6578\u64da\u5eab\u5982\u4f55\u5275\u5efa\u4e00\u500b\u8b8a\u91cf)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%89%b5%e5%bb%ba%e8%ae%8a%e9%87%8f-TXbUcGULCJ\">\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u5275\u5efa\u8b8a\u91cf<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u8b8a\u91cf\u662f\u4e00\u7a2e\u7528\u65bc\u5b58\u5132\u81e8\u6642\u6578\u64da\u7684\u5de5\u5177\uff0c\u901a\u5e38\u5728\u57f7\u884c\u5b58\u5132\u904e\u7a0b\u6216\u89f8\u767c\u5668\u6642\u4f7f\u7528\u3002\u8b8a\u91cf\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5728\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u9032\u884c\u8a08\u7b97\u3001\u5b58\u5132\u4e2d\u9593\u7d50\u679c\u6216\u63a7\u5236\u6d41\u7a0b\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u5275\u5efa\u8b8a\u91cf\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e8%ae%8a%e9%87%8f%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-TXbUcGULCJ\">\u8b8a\u91cf\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u8b8a\u91cf\u662f\u4e00\u500b\u547d\u540d\u7684\u5b58\u5132\u4f4d\u7f6e\uff0c\u53ef\u4ee5\u5728\u6578\u64da\u5eab\u7684\u6703\u8a71\u4e2d\u4f7f\u7528\u3002\u5b83\u5011\u7684\u503c\u53ef\u4ee5\u5728\u57f7\u884c\u904e\u7a0b\u4e2d\u6539\u8b8a\uff0c\u4e26\u4e14\u901a\u5e38\u5728\u5b58\u5132\u904e\u7a0b\u3001\u51fd\u6578\u6216\u89f8\u767c\u5668\u4e2d\u4f7f\u7528\u3002\u8b8a\u91cf\u7684\u985e\u578b\u901a\u5e38\u53d6\u6c7a\u65bc\u6578\u64da\u5eab\u7cfb\u7d71\uff0c\u4f8b\u5982 MySQL\u3001SQL Server \u6216 Oracle \u7b49\u3002<\/p>\n<h2 id=\"%e5%9c%a8-mysql-%e4%b8%ad%e5%89%b5%e5%bb%ba%e8%ae%8a%e9%87%8f-TXbUcGULCJ\">\u5728 MySQL \u4e2d\u5275\u5efa\u8b8a\u91cf<\/h2>\n<p>\u5728 MySQL \u4e2d\uff0c\u8b8a\u91cf\u53ef\u4ee5\u4f7f\u7528 <code>SET<\/code> \u8a9e\u53e5\u6216 <code>SELECT<\/code> \u8a9e\u53e5\u4f86\u5275\u5efa\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u793a\u4f8b\uff1a<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8-set-%e8%aa%9e%e5%8f%a5%e5%89%b5%e5%bb%ba%e8%ae%8a%e9%87%8f-TXbUcGULCJ\">\u4f7f\u7528 SET \u8a9e\u53e5\u5275\u5efa\u8b8a\u91cf<\/h3>\n<pre><code>SET @my_variable = 10;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba <code>@my_variable<\/code> \u7684\u8b8a\u91cf\uff0c\u4e26\u5c07\u5176\u503c\u8a2d\u7f6e\u70ba 10\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8-select-%e8%aa%9e%e5%8f%a5%e5%89%b5%e5%bb%ba%e8%ae%8a%e9%87%8f-TXbUcGULCJ\">\u4f7f\u7528 SELECT \u8a9e\u53e5\u5275\u5efa\u8b8a\u91cf<\/h3>\n<pre><code>SELECT @my_variable := COUNT(*) FROM my_table;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07 <code>my_table<\/code> \u8868\u4e2d\u7684\u884c\u6578\u8ce6\u503c\u7d66\u8b8a\u91cf <code>@my_variable<\/code>\u3002<\/p>\n<h2 id=\"%e5%9c%a8-sql-server-%e4%b8%ad%e5%89%b5%e5%bb%ba%e8%ae%8a%e9%87%8f-TXbUcGULCJ\">\u5728 SQL Server \u4e2d\u5275\u5efa\u8b8a\u91cf<\/h2>\n<p>\u5728 SQL Server \u4e2d\uff0c\u8b8a\u91cf\u7684\u5275\u5efa\u65b9\u5f0f\u7565\u6709\u4e0d\u540c\u3002\u4f7f\u7528 <code>DECLARE<\/code> \u8a9e\u53e5\u4f86\u8072\u660e\u8b8a\u91cf\uff0c\u7136\u5f8c\u4f7f\u7528 <code>SET<\/code> \u6216 <code>SELECT<\/code> \u4f86\u8ce6\u503c\u3002<\/p>\n<h3 id=\"%e8%81%b2%e6%98%8e%e5%92%8c%e8%b3%a6%e5%80%bc%e8%ae%8a%e9%87%8f-TXbUcGULCJ\">\u8072\u660e\u548c\u8ce6\u503c\u8b8a\u91cf<\/h3>\n<pre><code>DECLARE @my_variable INT;\nSET @my_variable = 10;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u9996\u5148\u8072\u660e\u4e86\u4e00\u500b\u6574\u6578\u985e\u578b\u7684\u8b8a\u91cf <code>@my_variable<\/code>\uff0c\u7136\u5f8c\u5c07\u5176\u503c\u8a2d\u7f6e\u70ba 10\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8-select-%e8%b3%a6%e5%80%bc-TXbUcGULCJ\">\u4f7f\u7528 SELECT \u8ce6\u503c<\/h3>\n<pre><code>DECLARE @my_variable INT;\nSELECT @my_variable = COUNT(*) FROM my_table;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07 <code>my_table<\/code> \u8868\u4e2d\u7684\u884c\u6578\u8ce6\u503c\u7d66\u8b8a\u91cf <code>@my_variable<\/code>\u3002<\/p>\n<h2 id=\"%e5%9c%a8-oracle-%e4%b8%ad%e5%89%b5%e5%bb%ba%e8%ae%8a%e9%87%8f-TXbUcGULCJ\">\u5728 Oracle \u4e2d\u5275\u5efa\u8b8a\u91cf<\/h2>\n<p>\u5728 Oracle \u6578\u64da\u5eab\u4e2d\uff0c\u8b8a\u91cf\u901a\u5e38\u5728 PL\/SQL \u5340\u584a\u4e2d\u8072\u660e\u3002\u4f7f\u7528 <code>DECLARE<\/code> \u8a9e\u53e5\u4f86\u5275\u5efa\u8b8a\u91cf\u3002<\/p>\n<h3 id=\"%e8%81%b2%e6%98%8e%e8%ae%8a%e9%87%8f-TXbUcGULCJ\">\u8072\u660e\u8b8a\u91cf<\/h3>\n<pre><code>DECLARE\n    my_variable NUMBER;\nBEGIN\n    my_variable := 10;\nEND;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u8072\u660e\u4e86\u4e00\u500b\u540d\u70ba <code>my_variable<\/code> \u7684\u8b8a\u91cf\uff0c\u4e26\u5c07\u5176\u503c\u8a2d\u7f6e\u70ba 10\u3002<\/p>\n<h2 id=\"%e8%ae%8a%e9%87%8f%e7%9a%84%e4%bd%bf%e7%94%a8%e5%a0%b4%e6%99%af-TXbUcGULCJ\">\u8b8a\u91cf\u7684\u4f7f\u7528\u5834\u666f<\/h2>\n<p>\u8b8a\u91cf\u5728\u6578\u64da\u5eab\u4e2d\u7684\u4f7f\u7528\u5834\u666f\u975e\u5e38\u5ee3\u6cdb\uff0c\u5305\u62ec\u4f46\u4e0d\u9650\u65bc\uff1a<\/p>\n<ul>\n<li>\u5728\u5b58\u5132\u904e\u7a0b\u4e2d\u9032\u884c\u8a08\u7b97\u548c\u908f\u8f2f\u8655\u7406\u3002<\/li>\n<li>\u5728\u89f8\u767c\u5668\u4e2d\u5b58\u5132\u4e2d\u9593\u7d50\u679c\u3002<\/li>\n<li>\u5728\u5831\u544a\u751f\u6210\u904e\u7a0b\u4e2d\u5b58\u5132\u7d71\u8a08\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-TXbUcGULCJ\">\u7e3d\u7d50<\/h2>\n<p>\u8b8a\u91cf\u5728\u6578\u64da\u5eab\u4e2d\u662f\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u9748\u6d3b\u5730\u8655\u7406\u6578\u64da\u3002\u7121\u8ad6\u662f\u5728 MySQL\u3001SQL Server \u9084\u662f Oracle \u4e2d\uff0c\u5275\u5efa\u548c\u4f7f\u7528\u8b8a\u91cf\u7684\u57fa\u672c\u65b9\u6cd5\u90fd\u76f8\u5c0d\u7c21\u55ae\u3002\u901a\u904e\u672c\u6587\u7684\u4ecb\u7d39\uff0c\u5e0c\u671b\u80fd\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u5275\u5efa\u548c\u4f7f\u7528\u8b8a\u91cf\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u6216\u5176\u4ed6\u76f8\u95dc\u670d\u52d9\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u5275\u5efa\u8b8a\u91cf\uff0c\u638c\u63e1\u6578\u64da\u7ba1\u7406\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u64cd\u4f5c\u6548\u7387\uff0c\u5be6\u73fe\u9748\u6d3b\u7684\u6578\u64da\u8655\u7406\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-179820","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179820","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=179820"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179820\/revisions"}],"predecessor-version":[{"id":179821,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179820\/revisions\/179821"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179820"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179820"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179820"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}