sqlserver判断字段是否存在，表是否存在

--创建字段[Pro_List].[Pro_Id] 创建人： 创建时间：2018-08-22 08:52:13
IF NOT EXISTS ( SELECT TOP 1
                        1
                FROM    INFORMATION_SCHEMA.COLUMNS
                WHERE   [TABLE_NAME] = \'Pro_List\'
                        AND [COLUMN_NAME] = \'Pro_Id\' ) 
    BEGIN 
        ALTER TABLE Pro_List ADD Pro_Id int IDENTITY(1,1) NOT NULL 
        EXEC sys.sp_addextendedproperty @name = N\'MS_Description\',
            @value = N\'\', @level0type = N\'SCHEMA\', @level0name = N\'dbo\',
            @level1type = N\'TABLE\', @level1name = N\'Pro_List\',
            @level2type = N\'COLUMN\', @level2name = N\'Pro_Id\'
    END 
GO


--创建表[SysErrorLog] 创建人： 创建时间：2018-08-22 08:52:50
IF NOT EXISTS ( SELECT  *
                FROM    sysobjects
                WHERE   id = OBJECT_ID(N\'[SysErrorLog]\')
                        AND OBJECTPROPERTY(id, N\'IsUserTable\') = 1 ) 
BEGIN 
    CREATE TABLE [dbo].[SysErrorLog]( 
        [Id] bigint IDENTITY(1,1) NOT NULL 
        ,[Uid] int   
        ,[ErrorNo] [nvarchar](50)   
        ,[ErrorTitle] [nvarchar](100)   
        ,[CreateDate] datetime   
        ,[ErrorPage] [nvarchar](500)   
        ,[FriendlyMsg] [nvarchar](MAX)   
        ,[TargetSite] [nvarchar](500)   
        ,[StackTrace] ntext   
        CONSTRAINT [PK_SysErrorLog] PRIMARY KEY CLUSTERED 
        (
            [Id] ASC
        ) ON [PRIMARY]
    )     
    EXEC sys.sp_addextendedproperty @name=N\'MS_Description\', @value=N\'Id\' , @level0type=N\'SCHEMA\',@level0name=N\'dbo\', @level1type=N\'TABLE\',@level1name=N\'SysErrorLog\', @level2type=N\'COLUMN\',@level2name=N\'Id\'
    EXEC sys.sp_addextendedproperty @name=N\'MS_Description\', @value=N\'Uid\' , @level0type=N\'SCHEMA\',@level0name=N\'dbo\', @level1type=N\'TABLE\',@level1name=N\'SysErrorLog\', @level2type=N\'COLUMN\',@level2name=N\'Uid\'
    EXEC sys.sp_addextendedproperty @name=N\'MS_Description\', @value=N\'ErrorNo\' , @level0type=N\'SCHEMA\',@level0name=N\'dbo\', @level1type=N\'TABLE\',@level1name=N\'SysErrorLog\', @level2type=N\'COLUMN\',@level2name=N\'ErrorNo\'
    EXEC sys.sp_addextendedproperty @name=N\'MS_Description\', @value=N\'ErrorTitle\' , @level0type=N\'SCHEMA\',@level0name=N\'dbo\', @level1type=N\'TABLE\',@level1name=N\'SysErrorLog\', @level2type=N\'COLUMN\',@level2name=N\'ErrorTitle\'
    EXEC sys.sp_addextendedproperty @name=N\'MS_Description\', @value=N\'CreateDate\' , @level0type=N\'SCHEMA\',@level0name=N\'dbo\', @level1type=N\'TABLE\',@level1name=N\'SysErrorLog\', @level2type=N\'COLUMN\',@level2name=N\'CreateDate\'
    EXEC sys.sp_addextendedproperty @name=N\'MS_Description\', @value=N\'ErrorPage\' , @level0type=N\'SCHEMA\',@level0name=N\'dbo\', @level1type=N\'TABLE\',@level1name=N\'SysErrorLog\', @level2type=N\'COLUMN\',@level2name=N\'ErrorPage\'
    EXEC sys.sp_addextendedproperty @name=N\'MS_Description\', @value=N\'FriendlyMsg\' , @level0type=N\'SCHEMA\',@level0name=N\'dbo\', @level1type=N\'TABLE\',@level1name=N\'SysErrorLog\', @level2type=N\'COLUMN\',@level2name=N\'FriendlyMsg\'
    EXEC sys.sp_addextendedproperty @name=N\'MS_Description\', @value=N\'TargetSite\' , @level0type=N\'SCHEMA\',@level0name=N\'dbo\', @level1type=N\'TABLE\',@level1name=N\'SysErrorLog\', @level2type=N\'COLUMN\',@level2name=N\'TargetSite\'
    EXEC sys.sp_addextendedproperty @name=N\'MS_Description\', @value=N\'StackTrace\' , @level0type=N\'SCHEMA\',@level0name=N\'dbo\', @level1type=N\'TABLE\',@level1name=N\'SysErrorLog\', @level2type=N\'COLUMN\',@level2name=N\'StackTrace\'
    EXEC sys.sp_addextendedproperty @name=N\'MS_Description\', @value=N\'SysErrorLog\' , @level0type=N\'SCHEMA\',@level0name=N\'dbo\', @level1type=N\'TABLE\',@level1name=N\'SysErrorLog\'
END
GO