相关疑难解决方法(0)

如果不存在,我需要添加一个特定的列.我有类似以下内容,但它总是返回false:

IF EXISTS(SELECT *
          FROM   INFORMATION_SCHEMA.COLUMNS
          WHERE  TABLE_NAME = 'myTableName'
                 AND COLUMN_NAME = 'myColumnName') 

如何检查SQL Server数据库的表中是否存在列？

这是一些Transact-SQL我试图通过sqlcmd(SQL Server 2005)运行.

USE PUK;
GO
BEGIN TRANSACTION;
BEGIN TRY

   -- - Modify RETRIEVAL_STAT
   alter table dbo.RETRIEVAL_STAT add
      SOURCE nvarchar(10) NULL,
      ACCOUNTNUMBER nvarchar(50) NULL,
      PUK nvarchar(20) NULL;

   -- transform logic.
   update dbo.RETRIEVAL_STAT set
      SOURCE = 'XX',
      ACCOUNTNUMBER = 'XX',
      PUK = 'XX';

END TRY
BEGIN CATCH
    SELECT
        ERROR_NUMBER() AS ErrorNumber
        ,ERROR_SEVERITY() AS ErrorSeverity
        ,ERROR_STATE() AS ErrorState
        ,ERROR_PROCEDURE() AS ErrorProcedure
        ,ERROR_LINE() AS ErrorLine
        ,ERROR_MESSAGE() AS ErrorMessage;
    IF @@TRANCOUNT > 0
        ROLLBACK TRANSACTION;
END CATCH;
IF @@TRANCOUNT > 0
    COMMIT TRANSACTION;
GO …

这是一个非常简单的代码,但它无法捕获错误.

或者如何捕获错误？

谢谢.

BEGIN TRY
    ALTER TABLE [dbo].[my_table_name] 
    ADD PRIMARY KEY ([id]);
END TRY
BEGIN CATCH
    PRINT 'Primary Key already exists. '
END CATCH