如何将参数后期绑定到存储过程中的动态sql语句 [英] how to late parameter bind to dynamic sql statement in a stored procedure

问题描述

我正在尝试根据FieldMapping表和一些业务规则动态构建T-SQL语句.

I am attempting to dynamically build a T-SQL statement based on a FieldMapping table and some business rules.

总而言之，我有一个函数可以将SQL语句作为varchar(max)返回，并在存储过程中以EXEC (@Sql)的身份执行.

Cut the long story short, I have a function that will return the SQL statement as a varchar(max) that I will execute as EXEC (@Sql) in my stored procedure.

允许我通过测试表进行演示

Allow me to demonstrate with a test table

create procedure [dbo].[sp_TestInsert]
(
    @Id int,
    @Name varchar(20),
    @Surname varchar(20),
    @Age int,
    @Source varchar(1)
)
as
    declare @sql varchar(max)
    -- Return SQL statement that depends on business rules
    -- i.e. if the @Source = 'i' the returned SQL will be:
    -- "update TestTable set Name = @Name, Surname = @Surname, SONbr = @SONbr WHERE Id = @Id"
    -- however if the @Source = 'a' the returned SQL will be
    -- "update TestTable set Name = @Name, Surname = @Surname, SONbr = @SONbr, Age = @Age WHERE Id = @Id"
    -- As you can see, in case of 'i', it will NOT return Age = @Age

    set @sql = dbo.func_UpdateOrInsert('TestTable', @Source)

    -- When this statement is executed, the error I get is 'scalar @Name does not exist'
    exec (@sql)

我已对该操作发表了评论.

I've commented on the operation.

问题很明显，我希望@ Id，@ Name，@ Surname等...在上下文中会自动绑定到相应的字段名称[Id]，[Name]，[Surname]等存储过程...但是，事实并非如此.

The problem is obvious, I would have expected that @Id, @Name, @Surname etc... would bind automatically to the corresponding field names [Id], [Name], [Surname] etc in the context of the stored procedure... however, this is not the case.

有什么方法可以将参数绑定到动态构建的SQL语句?

Is there any way I can bind the parameters to a dynamically built SQL statement?

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