<div class="codebody" id="code29342"> --标量值函数 -- ================================================ -- Template generated from Template Explorer using: -- Create Scalar Function (New Menu).SQL -- -- Use the Specify Values for Template Parameters -- command (Ctrl-Shift-M) to fill in the parameter -- values below. -- -- This block of comments will not be included in -- the definition of the function. -- ================================================ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO -- ============================================= -- Author: <Author,Name> -- Create date: <Create Date,> -- Description: <Description,> -- ============================================= CREATE FUNCTION <Scalar_Function_Name,sysname,FunctionName> ( -- Add the parameters for the function here <@Param1,@p1> <Data_Type_For_Param1,int> ) RETURNS <Function_Data_Type,int> AS BEGIN -- Declare the return variable here DECLARE <@ResultVar,@Result> <Function_Data_Type,int> -- Add the T-SQL statements to compute the return value here SELECT <@ResultVar,@Result> = <@Param1,@p1> -- Return the result of the function RETURN <@ResultVar,@Result> END
<div class="codebody" id="code21056"> --内联表值函数 -- ================================================ -- Template generated from Template Explorer using: -- Create Inline Function (New Menu).SQL -- -- Use the Specify Values for Template Parameters -- command (Ctrl-Shift-M) to fill in the parameter -- values below. -- -- This block of comments will not be included in -- the definition of the function. -- ================================================ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO -- ============================================= -- Author: <Author,> -- ============================================= CREATE FUNCTION <Inline_Function_Name,FunctionName> ( -- Add the parameters for the function here <@param1,int>, <@param2,@p2> <Data_Type_For_Param2,char> ) RETURNS TABLE AS RETURN ( -- Add the SELECT statement with parameter references here SELECT 0 ) GO
<div class="codebody" id="code99030"> --多语句表值函数 -- ================================================ -- Template generated from Template Explorer using: -- Create Multi-Statement Function (New Menu).SQL -- -- Use the Specify Values for Template Parameters -- command (Ctrl-Shift-M) to fill in the parameter -- values below. -- -- This block of comments will not be included in -- the definition of the function. -- ================================================ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO -- ============================================= -- Author: <Author,> -- ============================================= CREATE FUNCTION <Table_Function_Name,@p1> <data_type_for_param1,@p2> <data_type_for_param2,char> ) RETURNS <@Table_Variable_Name,@Table_Var> TABLE ( -- Add the column definitions for the TABLE variable here <Column_1,c1> <Data_Type_For_Column1, <Column_2,c2> <Data_Type_For_Column2,int> ) AS BEGIN -- Fill the table variable with the rows for your result set RETURN END GO
<div class="codebody" id="code38550"> --示意性SQL脚本 DECLARE @MergeDate Datetime DECLARE @MasterId Int DECLARE @DuplicateId Int SELECT @MergeDate = GetDate() DECLARE merge_cursor CURSOR FAST_FORWARD FOR SELECT MasterCustomerId,DuplicateCustomerId FROM DuplicateCustomers WHERE IsMerged = 0 --定义一个游标对象[merge_cursor] --该游标中包含的为:[SELECT MasterCustomerId,DuplicateCustomerId FROM DuplicateCustomers WHERE IsMerged = 0 ]查询的结果. OPEN merge_cursor --打开游标 FETCH NEXT FROM merge_cursor INTO @MasterId,@DuplicateId --取数据到临时变量 WHILE @@FETCH_STATUS = 0 --系统@@FETCH_STATUS = 0 时循环结束 --做循环处理 BEGIN EXEC MergeDuplicateCustomers @MasterId,@DuplicateId UPDATE DuplicateCustomers SET IsMerged = 1, MergeDate = @MergeDate WHERE MasterCustomerId = @MasterId AND DuplicateCustomerId = @DuplicateId FETCH NEXT FROM merge_cursor INTO @MasterId,@DuplicateId --再次取值 END CLOSE merge_cursor --关闭游标 DEALLOCATE merge_cursor --删除游标
[说明:游标使用必须要配对,Open--Close,最后一定要记得删除游标.] 5.事务:当一次处理中存在多个操作,要么全部操作,要么全部不操作,操作失败一个,其他的就全部要撤销,不管其他的是否执行成功,这时就需要用到事务. <div class="codetitle"><a style="CURSOR: pointer" data="19988" class="copybut" id="copybut19988" onclick="doCopy('code19988')"> 代码如下:<div class="codebody" id="code19988"> begin tran update tableA set columnsA=1,columnsB=2 where RecIs=1 if(@@ERROR <> 0 OR @@ROWCOUNT <> 1) begin rollback tran raiserror( '此次update表tableA出错!!',16,1 ) return end insert into tableB (columnsA,columnsB) values (1,2) if(@@ERROR <> 0 OR @@ROWCOUNT <> 1) begin rollback tran raiserror( '此次update表tableA出错!!',1 ) return end end commit