{"id":143799,"date":"2024-11-01T01:20:33","date_gmt":"2024-10-31T17:20:33","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143799\/"},"modified":"2024-11-01T01:20:34","modified_gmt":"2024-10-31T17:20:34","slug":"sql-%e5%8b%95%e6%85%8b%e6%9f%a5%e8%a9%a2%e7%9a%84%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143799\/","title":{"rendered":"SQL \u52d5\u614b\u67e5\u8a62\u7684\u793a\u4f8b"},"content":{"rendered":"<h1 id=\"sql-%e5%8b%95%e6%85%8b%e6%9f%a5%e8%a9%a2%e7%9a%84%e7%a4%ba%e4%be%8b-tqCsahzxIR\">SQL \u52d5\u614b\u67e5\u8a62\u7684\u793a\u4f8b<\/h1>\n<p>\u5728\u73fe\u4ee3\u7684\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u6700\u5e38\u7528\u7684\u8a9e\u8a00\u4e4b\u4e00\u3002\u52d5\u614b\u67e5\u8a62\u662f\u6307\u5728\u57f7\u884c\u6642\u6839\u64da\u7528\u6236\u7684\u8f38\u5165\u6216\u5176\u4ed6\u689d\u4ef6\u751f\u6210\u7684\u67e5\u8a62\u3002\u9019\u7a2e\u67e5\u8a62\u65b9\u5f0f\u5728\u8655\u7406\u4e0d\u78ba\u5b9a\u6027\u548c\u8b8a\u5316\u7684\u6578\u64da\u6642\u7279\u5225\u6709\u7528\u3002\u672c\u6587\u5c07\u63a2\u8a0e SQL \u52d5\u614b\u67e5\u8a62\u7684\u6982\u5ff5\u3001\u512a\u52e2\u4ee5\u53ca\u4e00\u4e9b\u5be6\u969b\u7684\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%8b%95%e6%85%8b%e6%9f%a5%e8%a9%a2%ef%bc%9f-tqCsahzxIR\">\u4ec0\u9ebc\u662f\u52d5\u614b\u67e5\u8a62\uff1f<\/h2>\n<p>\u52d5\u614b\u67e5\u8a62\u662f\u6307\u5728\u57f7\u884c\u6642\u751f\u6210\u7684 SQL \u67e5\u8a62\u8a9e\u53e5\u3002\u8207\u975c\u614b\u67e5\u8a62\u4e0d\u540c\uff0c\u975c\u614b\u67e5\u8a62\u5728\u7de8\u5beb\u6642\u5c31\u5df2\u7d93\u78ba\u5b9a\u4e86\u6240\u6709\u7684\u689d\u4ef6\u548c\u53c3\u6578\uff0c\u800c\u52d5\u614b\u67e5\u8a62\u5247\u53ef\u4ee5\u6839\u64da\u7528\u6236\u7684\u8f38\u5165\u6216\u5176\u4ed6\u8b8a\u91cf\u4f86\u6539\u8b8a\u67e5\u8a62\u7684\u5167\u5bb9\u3002\u9019\u4f7f\u5f97\u52d5\u614b\u67e5\u8a62\u5728\u8655\u7406\u8907\u96dc\u7684\u67e5\u8a62\u9700\u6c42\u6642\u66f4\u52a0\u9748\u6d3b\u3002<\/p>\n<h2 id=\"%e5%8b%95%e6%85%8b%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%84%aa%e5%8b%a2-tqCsahzxIR\">\u52d5\u614b\u67e5\u8a62\u7684\u512a\u52e2<\/h2>\n<ul>\n<li><strong>\u9748\u6d3b\u6027\uff1a<\/strong>\u52d5\u614b\u67e5\u8a62\u53ef\u4ee5\u6839\u64da\u4e0d\u540c\u7684\u689d\u4ef6\u751f\u6210\u4e0d\u540c\u7684\u67e5\u8a62\uff0c\u9019\u4f7f\u5f97\u5b83\u80fd\u5920\u9069\u61c9\u591a\u8b8a\u7684\u9700\u6c42\u3002<\/li>\n<li><strong>\u6e1b\u5c11\u91cd\u8907\u4ee3\u78bc\uff1a<\/strong>\u901a\u904e\u4f7f\u7528\u52d5\u614b\u67e5\u8a62\uff0c\u53ef\u4ee5\u6e1b\u5c11\u70ba\u6bcf\u500b\u67e5\u8a62\u689d\u4ef6\u7de8\u5beb\u4e0d\u540c SQL \u8a9e\u53e5\u7684\u9700\u8981\u3002<\/li>\n<li><strong>\u63d0\u9ad8\u6027\u80fd\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u52d5\u614b\u67e5\u8a62\u53ef\u4ee5\u901a\u904e\u751f\u6210\u66f4\u7cbe\u78ba\u7684\u67e5\u8a62\u4f86\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%8b%95%e6%85%8b%e6%9f%a5%e8%a9%a2%e7%9a%84%e7%a4%ba%e4%be%8b-tqCsahzxIR\">\u52d5\u614b\u67e5\u8a62\u7684\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 SQL Server \u7684\u52d5\u614b\u67e5\u8a62\u793a\u4f8b\u3002\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>Employees<\/code> \u7684\u8868\uff0c\u5305\u542b\u54e1\u5de5\u7684\u59d3\u540d\u3001\u8077\u4f4d\u548c\u90e8\u9580\u7b49\u4fe1\u606f\u3002\u6211\u5011\u5e0c\u671b\u6839\u64da\u7528\u6236\u7684\u8f38\u5165\u4f86\u67e5\u8a62\u7279\u5b9a\u7684\u54e1\u5de5\u4fe1\u606f\u3002<\/p>\n<pre><code>DECLARE @SQL NVARCHAR(MAX);\nDECLARE @Department NVARCHAR(50);\nSET @Department = 'Sales'; -- \u7528\u6236\u8f38\u5165\u7684\u90e8\u9580\n\nSET @SQL = 'SELECT * FROM Employees WHERE Department = @Dept';\nEXEC sp_executesql @SQL, N'@Dept NVARCHAR(50)', @Dept = @Department;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u9996\u5148\u8072\u660e\u4e86\u4e00\u500b\u8b8a\u91cf <code>@SQL<\/code> \u4f86\u5b58\u5132\u6211\u5011\u7684 SQL \u67e5\u8a62\u8a9e\u53e5\u3002\u7136\u5f8c\uff0c\u6211\u5011\u6839\u64da\u7528\u6236\u7684\u8f38\u5165\u8a2d\u7f6e\u4e86\u90e8\u9580\u7684\u503c\u3002\u63a5\u4e0b\u4f86\uff0c\u6211\u5011\u4f7f\u7528 <code>sp_executesql<\/code> \u5b58\u5132\u904e\u7a0b\u4f86\u57f7\u884c\u52d5\u614b\u67e5\u8a62\uff0c\u9019\u6a23\u53ef\u4ee5\u6709\u6548\u5730\u9632\u6b62 SQL \u6ce8\u5165\u653b\u64ca\u3002<\/p>\n<h3 id=\"%e5%8f%a6%e4%b8%80%e5%80%8b%e7%a4%ba%e4%be%8b%ef%bc%9a%e5%a4%9a%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2-tqCsahzxIR\">\u53e6\u4e00\u500b\u793a\u4f8b\uff1a\u591a\u689d\u4ef6\u67e5\u8a62<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u5e0c\u671b\u6839\u64da\u591a\u500b\u689d\u4ef6\u4f86\u67e5\u8a62\u54e1\u5de5\u4fe1\u606f\uff0c\u4f8b\u5982\u6839\u64da\u90e8\u9580\u548c\u8077\u4f4d\u9032\u884c\u7be9\u9078\u3002\u4ee5\u4e0b\u662f\u76f8\u61c9\u7684 SQL \u52d5\u614b\u67e5\u8a62\u793a\u4f8b\uff1a<\/p>\n<pre><code>DECLARE @SQL NVARCHAR(MAX);\nDECLARE @Department NVARCHAR(50);\nDECLARE @Position NVARCHAR(50);\nSET @Department = 'Sales'; -- \u7528\u6236\u8f38\u5165\u7684\u90e8\u9580\nSET @Position = 'Manager'; -- \u7528\u6236\u8f38\u5165\u7684\u8077\u4f4d\n\nSET @SQL = 'SELECT * FROM Employees WHERE 1=1';\nIF @Department IS NOT NULL\n    SET @SQL = @SQL + ' AND Department = @Dept';\nIF @Position IS NOT NULL\n    SET @SQL = @SQL + ' AND Position = @Pos';\n\nEXEC sp_executesql @SQL, N'@Dept NVARCHAR(50), @Pos NVARCHAR(50)', @Dept = @Department, @Pos = @Position;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86 <code>1=1<\/code> \u4f5c\u70ba\u67e5\u8a62\u7684\u57fa\u790e\uff0c\u9019\u6a23\u53ef\u4ee5\u65b9\u4fbf\u5730\u6dfb\u52a0\u5176\u4ed6\u689d\u4ef6\u3002\u6839\u64da\u7528\u6236\u7684\u8f38\u5165\uff0c\u6211\u5011\u52d5\u614b\u5730\u69cb\u5efa\u67e5\u8a62\u8a9e\u53e5\uff0c\u4e26\u6700\u7d42\u57f7\u884c\u5b83\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-tqCsahzxIR\">\u7e3d\u7d50<\/h2>\n<p>\u52d5\u614b\u67e5\u8a62\u5728 SQL \u4e2d\u63d0\u4f9b\u4e86\u9748\u6d3b\u6027\u548c\u6548\u7387\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u4e0d\u78ba\u5b9a\u6027\u548c\u591a\u8b8a\u7684\u67e5\u8a62\u9700\u6c42\u6642\u3002\u901a\u904e\u4f7f\u7528\u52d5\u614b\u67e5\u8a62\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6e1b\u5c11\u91cd\u8907\u4ee3\u78bc\u4e26\u63d0\u9ad8\u6027\u80fd\u3002\u7136\u800c\uff0c\u5728\u4f7f\u7528\u52d5\u614b\u67e5\u8a62\u6642\uff0c\u5fc5\u9808\u8b39\u614e\u8655\u7406\u7528\u6236\u8f38\u5165\uff0c\u4ee5\u9632\u6b62 SQL \u6ce8\u5165\u7b49\u5b89\u5168\u554f\u984c\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u53ef\u4ee5\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\uff0c\u78ba\u4fdd\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u6d41\u66a2\u6027\u548c\u5b89\u5168\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 SQL \u52d5\u614b\u67e5\u8a62\u7684\u793a\u4f8b\uff0c\u4e86\u89e3\u5982\u4f55\u6839\u64da\u689d\u4ef6\u751f\u6210\u9748\u6d3b\u7684\u67e5\u8a62\u8a9e\u53e5\uff0c\u4ee5\u63d0\u9ad8\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u6548\u7387\u548c\u9748\u6d3b\u6027\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-143799","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143799","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=143799"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143799\/revisions"}],"predecessor-version":[{"id":143800,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143799\/revisions\/143800"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143799"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143799"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143799"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}