{"id":135161,"date":"2024-10-31T08:21:44","date_gmt":"2024-10-31T00:21:44","guid":{"rendered":"https:\/\/server.hk\/cnblog\/135161\/"},"modified":"2024-10-31T08:21:44","modified_gmt":"2024-10-31T00:21:44","slug":"sql-server-2000-udf%e6%b7%b1%e5%ba%a6%e7%99%bc%e6%8e%98%e5%a6%82%e4%bd%95%e9%80%b2%e8%a1%8c%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/135161\/","title":{"rendered":"SQL Server 2000 UDF\u6df1\u5ea6\u767c\u6398\u5982\u4f55\u9032\u884c\uff1f"},"content":{"rendered":"<h1 id=\"sql-server-2000-udf%e6%b7%b1%e5%ba%a6%e7%99%bc%e6%8e%98%e5%a6%82%e4%bd%95%e9%80%b2%e8%a1%8c%ef%bc%9f-DqiRjsbeOj\">SQL Server 2000 UDF\u6df1\u5ea6\u767c\u6398\u5982\u4f55\u9032\u884c\uff1f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u4f7f\u7528\u8005\u5b9a\u7fa9\u51fd\u6578\uff08User Defined Functions, UDF\uff09\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u64f4\u5c55 SQL Server \u7684\u529f\u80fd\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e SQL Server 2000 \u4e2d UDF \u7684\u4f7f\u7528\u65b9\u6cd5\u53ca\u5176\u6700\u4f73\u5be6\u8e10\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u5229\u7528\u9019\u4e00\u529f\u80fd\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e4%bd%bf%e7%94%a8%e8%80%85%e5%ae%9a%e7%be%a9%e5%87%bd%e6%95%b8%ef%bc%88udf%ef%bc%89%ef%bc%9f-DqiRjsbeOj\">\u4ec0\u9ebc\u662f\u4f7f\u7528\u8005\u5b9a\u7fa9\u51fd\u6578\uff08UDF\uff09\uff1f<\/h2>\n<p>\u4f7f\u7528\u8005\u5b9a\u7fa9\u51fd\u6578\u662f\u7531\u7528\u6236\u5275\u5efa\u7684\u51fd\u6578\uff0c\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u5728 SQL \u67e5\u8a62\u4e2d\u88ab\u8abf\u7528\u3002UDF \u53ef\u4ee5\u8fd4\u56de\u55ae\u4e00\u503c\u6216\u8868\u683c\uff0c\u4e26\u4e14\u53ef\u4ee5\u7528\u65bc\u7c21\u5316\u8907\u96dc\u7684\u67e5\u8a62\uff0c\u589e\u5f37\u4ee3\u78bc\u7684\u53ef\u8b80\u6027\u548c\u53ef\u91cd\u7528\u6027\u3002<\/p>\n<h2 id=\"udf-%e7%9a%84%e9%a1%9e%e5%9e%8b-DqiRjsbeOj\">UDF \u7684\u985e\u578b<\/h2>\n<ul>\n<li><strong>\u6a19\u91cf\u51fd\u6578\uff08Scalar Functions\uff09<\/strong>: \u8fd4\u56de\u55ae\u4e00\u503c\u7684\u51fd\u6578\uff0c\u4f8b\u5982\u6574\u6578\u3001\u5b57\u4e32\u6216\u65e5\u671f\u3002<\/li>\n<li><strong>\u8868\u683c\u51fd\u6578\uff08Table-Valued Functions\uff09<\/strong>: \u8fd4\u56de\u8868\u683c\u7684\u51fd\u6578\uff0c\u53ef\u4ee5\u5728 FROM \u5b50\u53e5\u4e2d\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba-udf-DqiRjsbeOj\">\u5982\u4f55\u5275\u5efa UDF<\/h2>\n<p>\u5728 SQL Server 2000 \u4e2d\uff0c\u5275\u5efa UDF \u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE FUNCTION \u51fd\u6578\u540d\u7a31 (@\u53c3\u65781 \u985e\u578b, @\u53c3\u65782 \u985e\u578b, ...)\nRETURNS \u8fd4\u56de\u985e\u578b\nAS\nBEGIN\n    -- \u51fd\u6578\u908f\u8f2f\n    RETURN \u8fd4\u56de\u503c\nEND<\/code><\/pre>\n<h3 id=\"%e7%af%84%e4%be%8b%ef%bc%9a%e5%89%b5%e5%bb%ba%e4%b8%80%e5%80%8b%e6%a8%99%e9%87%8f%e5%87%bd%e6%95%b8-DqiRjsbeOj\">\u7bc4\u4f8b\uff1a\u5275\u5efa\u4e00\u500b\u6a19\u91cf\u51fd\u6578<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u6a19\u91cf\u51fd\u6578\u7bc4\u4f8b\uff0c\u8a72\u51fd\u6578\u8a08\u7b97\u5169\u500b\u6574\u6578\u7684\u548c\uff1a<\/p>\n<pre><code>CREATE FUNCTION dbo.AddNumbers (@Num1 INT, @Num2 INT)\nRETURNS INT\nAS\nBEGIN\n    RETURN @Num1 + @Num2\nEND<\/code><\/pre>\n<p>\u4f7f\u7528\u6b64\u51fd\u6578\u7684\u67e5\u8a62\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT dbo.AddNumbers(5, 10) AS SumResult<\/code><\/pre>\n<h3 id=\"%e7%af%84%e4%be%8b%ef%bc%9a%e5%89%b5%e5%bb%ba%e4%b8%80%e5%80%8b%e8%a1%a8%e6%a0%bc%e5%87%bd%e6%95%b8-DqiRjsbeOj\">\u7bc4\u4f8b\uff1a\u5275\u5efa\u4e00\u500b\u8868\u683c\u51fd\u6578<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u8868\u683c\u51fd\u6578\u7684\u7bc4\u4f8b\uff0c\u8a72\u51fd\u6578\u8fd4\u56de\u4e00\u500b\u5305\u542b\u6240\u6709\u54e1\u5de5\u7684\u8868\u683c\uff1a<\/p>\n<pre><code>CREATE FUNCTION dbo.GetAllEmployees()\nRETURNS @EmployeeTable TABLE (EmployeeID INT, EmployeeName NVARCHAR(100))\nAS\nBEGIN\n    INSERT INTO @EmployeeTable\n    SELECT EmployeeID, EmployeeName FROM Employees\n    RETURN\nEND<\/code><\/pre>\n<p>\u4f7f\u7528\u6b64\u51fd\u6578\u7684\u67e5\u8a62\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT * FROM dbo.GetAllEmployees()<\/code><\/pre>\n<h2 id=\"udf-%e7%9a%84%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-DqiRjsbeOj\">UDF \u7684\u6700\u4f73\u5be6\u8e10<\/h2>\n<ul>\n<li><strong>\u907f\u514d\u4f7f\u7528 UDF \u5728 WHERE \u5b50\u53e5\u4e2d<\/strong>: \u5728 SQL Server \u4e2d\uff0cUDF \u7684\u6027\u80fd\u53ef\u80fd\u6703\u53d7\u5230\u5f71\u97ff\uff0c\u7279\u5225\u662f\u5728 WHERE \u5b50\u53e5\u4e2d\u4f7f\u7528\u6642\uff0c\u56e0\u70ba\u5b83\u6703\u5c0e\u81f4\u67e5\u8a62\u8a08\u5283\u7684\u91cd\u8907\u8a08\u7b97\u3002<\/li>\n<li><strong>\u4fdd\u6301\u51fd\u6578\u7c21\u55ae<\/strong>: \u51fd\u6578\u61c9\u8a72\u5c08\u6ce8\u65bc\u55ae\u4e00\u4efb\u52d9\uff0c\u907f\u514d\u904e\u65bc\u8907\u96dc\u7684\u908f\u8f2f\uff0c\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u53ef\u8b80\u6027\u548c\u53ef\u7dad\u8b77\u6027\u3002<\/li>\n<li><strong>\u6e2c\u8a66\u6027\u80fd<\/strong>: \u5728\u751f\u7522\u74b0\u5883\u4e2d\u4f7f\u7528\u4e4b\u524d\uff0c\u61c9\u8a72\u5c0d UDF \u9032\u884c\u6027\u80fd\u6e2c\u8a66\uff0c\u4ee5\u78ba\u4fdd\u5176\u4e0d\u6703\u5c0d\u7cfb\u7d71\u6027\u80fd\u9020\u6210\u8ca0\u9762\u5f71\u97ff\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-DqiRjsbeOj\">\u7e3d\u7d50<\/h2>\n<p>\u4f7f\u7528\u8005\u5b9a\u7fa9\u51fd\u6578\uff08UDF\uff09\u5728 SQL Server 2000 \u4e2d\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u64f4\u5c55 SQL \u7684\u529f\u80fd\uff0c\u7c21\u5316\u67e5\u8a62\u908f\u8f2f\u3002\u901a\u904e\u6b63\u78ba\u7684\u5275\u5efa\u548c\u4f7f\u7528 UDF\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u78bc\u7684\u53ef\u8b80\u6027\u548c\u53ef\u91cd\u7528\u6027\u3002\u82e5\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u6280\u8853\u652f\u6301\u6216\u5c0b\u627e\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8a0eSQL Server 2000\u4e2d\u7684\u7528\u6236\u81ea\u5b9a\u7fa9\u51fd\u6578\uff08UDF\uff09\uff0c\u5b78\u7fd2\u5982\u4f55\u5275\u5efa\u3001\u512a\u5316\u53ca\u61c9\u7528UDF\u4ee5\u63d0\u5347\u6578\u64da\u8655\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-135161","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/135161","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=135161"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/135161\/revisions"}],"predecessor-version":[{"id":135162,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/135161\/revisions\/135162"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=135161"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=135161"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=135161"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}