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我有一个SQL服务器脚本，其中包含多个批次，其编号为try catch。我跑了剧本，并得到了以下错误：获取变量名'@ErrorMessage'已被声明
The variable name '@ErrorMessage' has already been declared. Variable names must be unique within a query batch or stored procedure.
我已经在多个地方变量声明，但它的每个catch begin .. end范围内。不知道为什么它会抛出一个错误。
我尝试过和BEGIN TRANSACTION后移动的声明，但是我得到
Must declare the scalar variable "@ErrorMessage"
我怎样才能修复这个bug？
USE [TestWebDb2_Local]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
SET XACT_ABORT ON
GO
BEGIN TRANSACTION
BEGIN TRY
IF COLUMNPROPERTY(OBJECT_ID('[dbo].[MY_TABL]'), 'MY_REQID', 'ColumnId') IS NULL
BEGIN
ALTER TABLE [dbo].[MY_TABL] ADD MY_REQID INT NOT NULL DEFAULT(0)
END
IF COLUMNPROPERTY(OBJECT_ID('dbo.MY_TABL'), 'MY_ISCOMPLETED', 'ColumnId') IS NULL
BEGIN
ALTER TABLE [dbo].[MY_TABL] ADD MY_ISCOMPLETED BIT NOT NULL DEFAULT(0)
END
END TRY
BEGIN CATCH
-- Test whether the transaction is uncommittable.
IF (XACT_STATE()) = -1
BEGIN
DECLARE @ErrorMessage NVARCHAR(4000);
DECLARE @ErrorSeverity INT;
DECLARE @ErrorState INT;
SELECT
@ErrorMessage = ERROR_MESSAGE(),
@ErrorSeverity = ERROR_SEVERITY(),
@ErrorState = ERROR_STATE();
-- Use RAISERROR inside the CATCH block to return error
-- information about the original error that caused
-- execution to jump to the CATCH block.
RAISERROR (@ErrorMessage, -- Message text.
@ErrorSeverity, -- Severity.
@ErrorState -- State.
);
PRINT 'The transaction from Alter table is in an uncommittable state.' +
' Rolling back transaction.'
ROLLBACK TRANSACTION;
END;
END CATCH;
GO
BEGIN TRY
UPDATE [dbo].[MY_TABL] SET MY_REQID = 20 WHERE PENDTRANS_ABBREV = '1035'
END TRY
BEGIN CATCH
-- Test whether the transaction is uncommittable.
IF (XACT_STATE()) = -1
BEGIN
DECLARE @ErrorMessage NVARCHAR(4000);
DECLARE @ErrorSeverity INT;
DECLARE @ErrorState INT;
SELECT
@ErrorMessage = ERROR_MESSAGE(),
@ErrorSeverity = ERROR_SEVERITY(),
@ErrorState = ERROR_STATE();
-- Use RAISERROR inside the CATCH block to return error
-- information about the original error that caused
-- execution to jump to the CATCH block.
RAISERROR (@ErrorMessage, -- Message text.
@ErrorSeverity, -- Severity.
@ErrorState -- State.
);
PRINT 'The transaction from UPDATE table is in an uncommittable state.' +
' Rolling back transaction.'
ROLLBACK TRANSACTION;
END;
END CATCH;
BEGIN TRY
CREATE UNIQUE NONCLUSTERED INDEX idxReqId ON [dbo].[MY_TABL](MY_REQID)
PRINT 'Index created'
END TRY
BEGIN CATCH
-- Test whether the transaction is uncommittable.
IF (XACT_STATE()) = -1
BEGIN
DECLARE @ErrorMessage NVARCHAR(4000);
DECLARE @ErrorSeverity INT;
DECLARE @ErrorState INT;
SELECT
@ErrorMessage = ERROR_MESSAGE(),
@ErrorSeverity = ERROR_SEVERITY(),
@ErrorState = ERROR_STATE();
-- Use RAISERROR inside the CATCH block to return error
-- information about the original error that caused
-- execution to jump to the CATCH block.
RAISERROR (@ErrorMessage, -- Message text.
@ErrorSeverity, -- Severity.
@ErrorState -- State.
);
PRINT 'The transaction from Create Index is in an uncommittable state.' +
' Rolling back transaction.'
ROLLBACK TRANSACTION;
END;
END CATCH;
GO
if XACT_STATE() = 1
BEGIN
COMMIT TRANSACTION
PRINT 'Transaction committed.';
END;