私は名前を取得するSQL関数を作成必要なときにパスのIDと表名

Question

ALTER FUNCTION [dbo].[getName](@Id int,@Table_Name sysname,@col_name nvarchar(30),@col_condition) 
RETURNS nvarchar(400) 
AS 
BEGIN 
    DECLARE @r nvarchar(250) 
    DECLARE @DynamicSQL nvarchar(4000) 
    SET @DynamicSQL = N'SELECT '+@sl_col+' FROM ' + @Table_Name +' WHERE  @col_condition='+ @id 
    EXECUTE sp_executesql @DynamicSQL 
    set @r=EXECUTE sp_executesql @DynamicSQL 
    RETURN @r 
END 

試験：

SELECT Emp_Name FROM Emp WHERE emp_id=1 

Answer 1

ALTER FUNCTION [dbo].[getName] 
(@id int,@Table_Name sysname,@col_name nvarchar(30),@col_condition) 

RETURNS nvarchar(400) 

AS BEGIN 

DELCARE @r varchar(50) 
DECLARE @DynamicSQL nvarchar(4000) 

SET @DynamicSQL = 'SELECT @r = ' + @col_name + ' FROM ' + @Table_Name + ' WHERE ' + @col_condition + ' = ' + @id 

EXECUTE (@DynamicSQL) 

RETURN @r 

END