在存储过程中遇到一下的雷同语句,想写成函数调用
其中 @BasicUnit_1 为字段的值,BasicUnit_1为对应的字段名称
也就是说函数一个参数是字段名,一个参数是该字段的值
if (@BasicUnit_1 != 0) and (@BasicUnit_1 != null)
begin
update ProductPrice set BasicUnit_1 = cast(FactoryPrice * @BasicUnit_1 as decimal(18,2)) where ProductID in
(select ProductID from V_Products where @strWhere)
end
if (@BasicUnit_2 != 0) and (@BasicUnit_2 != null)
begin
update ProductPrice set BasicUnit_2 = cast(FactoryPrice * @BasicUnit_2 as decimal(18,2)) where ProductID in
(select ProductID from V_Products where @strWhere)
end
------解决方案--------------------
@strWhere这类,不能用函数,只能用动态SQL方式执行.
百度exec executesql
------解决方案--------------------
既然都是更新,那就不必用函数,用存储过程一样能解决,比如:
CREATE PROC Test
@ParaName VARCHAR(20),
@ParaValue VARCHAR(20),
@strWhere VARCHAR(100)
AS
BEGIN
DECLARE @Sql VARCHAR(1000)
IF ISNULL(@ParaValue,'0') !='0'
BEGIN
SET @Sql='UPDATE ProductPrice SET '+@ParaName+' = CAST(FactoryPrice * '+@ParaValue+' AS DECIMAL(18,2)) '+
'WHERE ProductID IN(SELECT ProductID FROM V_Products WHERE '+@strWhere+')'
EXEC(@Sql)
END
END
------解决方案--------------------
鸟说得不错 表名或者字段名为变量的时候 请看看动态SQL基本语法。
------解决方案--------------------
鸟哥正解!字段值和字段名用动态拼接的方式
------解决方案--------------------
if (@BasicUnit_1 != 0) and (@BasicUnit_1 != null)
begin
exec('update ProductPrice set BasicUnit_1 = cast(FactoryPrice *'+ ltrim(@BasicUnit_1)+' as decimal(18,2)) where ProductID in
(select ProductID from V_Products where '+@strWhere+'='+LTRIM(@BasicUnit_1)+')'
end
if (@BasicUnit_2 != 0) and (@BasicUnit_2 != null)
begin
exec('update ProductPrice set BasicUnit_1 = cast(FactoryPrice *'+ ltrim(@BasicUnit_2)+' as decimal(18,2)) where ProductID in
(select ProductID from V_Products where '+@strWhere+'='+LTRIM(@BasicUnit_2)+')'