如何在存储过程中使用 sp_executesql 获取最后一个标识值？

Question

我正在使用stored procedure 和sp_executesql 插入记录。一旦我使用sp_executesql 插入记录，我需要该会话中最后插入的identity 字段值。

ALTER proc [dbo].[spHoldTransaction] 


@RegisterNo int,
@StoreID int,
@Department varchar(50),
@TransactionDateFrom date,
@TransactionDateTo date,
@Comment Varchar(50)

AS
BEGIN

    DECLARE @RegisterID int;
    DECLARE @DatabaseName varchar(15);
    DECLARE @Batch int;


    SELECT @RegisterID=ID FROM Register WHERE Register.Number = @RegisterNo;

    SELECT @Batch = BatchNumber From Batch WHERE Status = 0 and RegisterID = @RegisterID


    SET @DatabaseName = 'xxx'

    SELECT  @Department=''''+REPLACE(@Department,',',''',''')+''''

    DECLARE @Qry nvarchar(MAX);

    DECLARE @ParamDefinition nvarchar(MAX);
    SET @ParamDefinition = N'@comment nvarchar(50),@StoreID int,@Batch int'

    SET @Qry = '
      INSERT INTO '+@DatabaseName+'.dbo.TransactionHold
     (
          [StoreID]       
          ,[HoldComment]          
          ,[BatchNumber]
          ,[ShippingNotes]
     )
     SELECT         
          @StoreID AS [StoreID]       
          ,@Comment AS [HoldComment]         
          ,@Batch AS [BatchNumber]
          ,'''' AS [ShippingNotes];       

     '

    EXECUTE sp_executesql @Qry, @ParamDefinition, @Comment, @StoreID, @Batch
    SELECT SCOPE_IDENTITY()

END

当我执行上面的存储过程时，它返回空。但是TransactionHold 有标识列Id

Answer 1

尝试在执行 sql 过程的同一范围内检索标识，并将值作为OUT 参数返回。做这些改变：

SET @ParamDefinition = N'@comment nvarchar(50),@StoreID int,@Batch int, @identity int out'

SET @Qry = '
      INSERT INTO '+@DatabaseName+'.dbo.TransactionHold
     (
          [StoreID]       
          ,[HoldComment]          
          ,[BatchNumber]
          ,[ShippingNotes]
     )
     SELECT         
          @StoreID AS [StoreID]       
          ,@Comment AS [HoldComment]         
          ,@Batch AS [BatchNumber]
          ,'''' AS [ShippingNotes];       

     SET @identity = @@IDENTITY

     '

DECLARE @identity INT

EXECUTE sp_executesql @Qry, @ParamDefinition, @Comment, @StoreID, @Batch, @identity OUT

SELECT @identity