Question

我是SQL查询的新手，在这里我试图从dbo.Customer_List表中获取完整的名称，并编写了这段代码。但是，当尝试运行时，我收到以下错误。我不知道自己做错了什么。

错误信息是：

Msg 1087, Level 16, State 1, Procedure getFullName, Line 11
Must declare the table variable "@tblName".
Msg 1087, Level 16, State 1, Procedure getFullName, Line 14
Must declare the table variable "@tblName".
Msg 102, Level 15, State 1, Line 1
Incorrect syntax near 'Last_Name'.

代码是：

IF OBJECT_ID (N'dbo.getFullName', N'FN') IS NOT NULL
    DROP FUNCTION getFullName
GO

Create function dbo.getFullName(@tblName varchar(30),@fstName varchar(50), @lstName varchar(50) ) returns varchar(101)
As
Begin

    Declare @rowCount int
    Declare @rowIteration int
    Declare @temp varchar(101)

        Select @rowCount = count(*) from @tblName
        Set @rowIteration = 1
  While ( @rowIteration <= @rowCount)
    Select @temp =  @fstName+' '+@lstName from @tblName where @tblName.Customer_Id = @rowIteration
    Begin

        Set @rowIteration = @rowIteration + 1
    End 
    return @temp
End

Go


Declare @tblName varchar(30),@fstName varchar(50), @lstName varchar(50)

set @tblName = convert(varchar(30),'dbo.Customer_List')
set @fstName = convert(varchar(50),'dbo.Customer_List.First_Name')
set @lstName = convert(varchar(50),'dbo.Customer_List.Last_Name')

Execute ('select dbo.getFullName('+ @tblName+','+ @fstName+','+ @lstName )

Answer 1

您实际上是在尝试执行动态SQL而不正确执行它。您不能仅将变量作为表名传入，这就是您收到错误的原因。

您需要将其重新创建为存储过程（或者至少您将在sql-server中，它不喜欢函数中的DML事务）并使用以下动态sql：

Declare @sql nvarchar(100)

Set @sql = 'Set @int = (Select count(*) from ' + @tblName + ')'

execute sp_executesql @sql, N'@int int output', @int = @rowCount output

将表名作为参数传递给函数时出错

1 个答案: