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************************************************************************** 函数名:GetClassName(@ClassID,@ClassType) 参数:@ClassID 类别的ID号，@ClassType,类别的种类 0:语言1:总分类，2：大类别，3：子类别 ,4:国家5:省份6:市县 返回：@ClassName类别的名称 nvarchar(100) *************************************************************************/ CREATE FUNCTION GetClassName(@ClassID as int, @ClassType as int) RETURNS nvarchar(100) as begin declare @ClassName as nvarchar(100) set @ClassName = \\\'\\\' if(@ClassType = 0) begin SELECT @ClassName = LngName FROM LXBIZ_Language WHERE (LngTypeID = @ClassID) end if(@ClassType = 1) begin SELECT @ClassName = CategoryName FROM LXBIZ_Category WHERE (CategoryID = @ClassID) end if(@ClassType = 2) begin SELECT @ClassName = ClassName FROM LXBIZ_BigClass WHERE (ClassID = @ClassID) end if(@ClassType = 3) begin SELECT @ClassName = SubClassName FROM LXBIZ_SubClass WHERE (SubClassID = @ClassID) end if(@ClassType = 4) begin SELECT @ClassName = CountryName FROM LXBIZ_Country WHERE (CountryID = @ClassID) end if(@ClassType = 5) begin SELECT @ClassName = ProvinceName FROM LXBIZ_Province WHERE (ProvinceID = @ClassID) end if(@ClassType = 6) begin SELECT @ClassName = CityName FROM LXBIZ_City WHERE (CityID = @ClassID) end return @ClassName end SQL自定义函数在SQL查询中的应用: 我帖一个我自定义的SQL视图给大家看一下 SELECT dbo.LXBIZ_AccoutInfo.AccoutID, dbo.LXBIZ_AccoutInfo.AccoutName, dbo.LXBIZ_AccoutInfo.AccoutPassWord, dbo.LXBIZ_AccoutInfo.SafeQuestion, dbo.LXBIZ_AccoutInfo.SafeAnswer, dbo.LXBIZ_AccoutInfo.AccoutEmail, dbo.LXBIZ_AccoutInfo.AccoutFlag, dbo.LXBIZ_AccoutInfo.AccoutLevel, dbo.LXBIZ_AccoutInfo.AccountExpireTime, dbo.LXBIZ_AccoutInfo.AccountMoney, dbo.LXBIZ_AccoutInfo.LoginCount, dbo.LXBIZ_AccoutInfo.LastLoginIP, dbo.LXBIZ_AccoutInfo.LastLoginTime, dbo.LXBIZ_AccoutInfo.RegTime, dbo.LXBIZ_EnterpriseInfo.EnterpriseID, dbo.LXBIZ_EnterpriseInfo.CompanyFileUrl, dbo.LXBIZ_EnterpriseInfo.ClassID, dbo.GetClassName(dbo.LXBIZ_EnterpriseInfo.ClassID, 2) AS ClassName, dbo.LXBIZ_EnterpriseInfo.ModeTypeID, dbo.LXBIZ_EnterpriseInfo.SellKeyword, dbo.LXBIZ_EnterpriseInfo.BuyKeyWord, dbo.LXBIZ_EnterpriseInfo.CompanyName, dbo.LXBIZ_EnterpriseInfo.CountryID, dbo.GetClassName(dbo.LXBIZ_EnterpriseInfo.CountryID, 4) AS CountryName, dbo.LXBIZ_EnterpriseInfo.ProvinceID, dbo.LXBIZ_EnterpriseInfo.CityID, dbo.LXBIZ_EnterpriseInfo.CompanyAddress, dbo.LXBIZ_EnterpriseInfo.CompanyUrl, dbo.LXBIZ_EnterpriseInfo.ContactName, dbo.LXBIZ_EnterpriseInfo.JobTitle, dbo.LXBIZ_EnterpriseInfo.ContactSex, dbo.LXBIZ_EnterpriseInfo.ContactTel, dbo.LXBIZ_EnterpriseInfo.ContactFax, dbo.LXBIZ_EnterpriseInfo.ContactMobile, dbo.LXBIZ_EnterpriseInfo.PostCode, dbo.LXBIZ_EnterpriseInfo.BankName, dbo.LXBIZ_EnterpriseInfo.BankNumber, dbo.LXBIZ_EnterpriseInfo.Turnover, dbo.LXBIZ_EnterpriseInfo.EmployersNum, dbo.LXBIZ_EnterpriseInfo.CompnayLICD, dbo.LXBIZ_EnterpriseInfo.CompanyHits, dbo.GetClassName(dbo.LXBIZ_EnterpriseInfo.LngTypeID, 0) AS LngName, <这是取出语言类别的名称,调用以上定义的自定义函数> dbo.LXBIZ_EnterpriseInfo.IssueTime, dbo.LXBIZ_EnterpriseInfo.Corporate FROM dbo.LXBIZ_EnterpriseInfo INNER JOIN dbo.LXBIZ_AccoutInfo ON dbo.LXBIZ_EnterpriseInfo.AccoutID = dbo.LXBIZ_AccoutInfo.AccoutID 返回类别: 教程 上一教程: 用DAO或ADO准确访问ACCESS2000 下一教程: 数据库设计指南(二) 您可以阅读与"SQL自定义函数的应用"相关的教程: · 15 个与日期时间相关的自定义函数 · 计算指定年月的最后一天的自定义MYSQL函数 · 金额阿拉伯数字转变为中文的自定义函数 · 自定义用于ASP WEB站点的SQL 7.0数据库(1) · SQL SERVER2000中用户自定义数据类型的使用 |
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