SET ANSI_NULLS OFF

GO

SET NOCOUNT ON

GO

SET LANGUAGE 'Simplified Chinese'

go

DECLARE @tbl nvarchar(200),@fld nvarchar(200),@sql nvarchar(4000),@maxlen int,@sample nvarchar(40)

SELECT d.name TableName,a.name FieldName,b.name TypeName,a.length Length,a.isnullable IS_NULL INTO #t

FROM  syscolumns  a,  systypes b,sysobjects d 

WHERE  a.xtype=b.xusertype  and  a.id=d.id  and  d.xtype='U'

DECLARE read_cursor CURSOR

FOR SELECT TableName,FieldName FROM #t

SELECT TOP 1 '_TableName                     ' TableName,

            'FieldName                      ' FieldName,'TypeName             ' TypeName,

            'Length' Length,'IS_NULL' IS_NULL,

            'MaxLenUsed' AS MaxLenUsed,'Sample Value          ' Sample,

             'Comment   ' Comment INTO #tc FROM #t

OPEN read_cursor

FETCH NEXT FROM read_cursor INTO @tbl,@fld

WHILE (@@fetch_status <> -1)  --- failes

BEGIN

       IF (@@fetch_status <> -2) -- Missing

       BEGIN

              SET @sql=N'SET @maxlen=(SELECT max(len(cast('+@fld+' as nvarchar))) FROM '+@tbl+')'

              --PRINT @sql

              EXEC SP_EXECUTESQL @sql,N'@maxlen int OUTPUT',@maxlen OUTPUT

              --print @maxlen

              SET @sql=N'SET @sample=(SELECT TOP 1 cast('+@fld+' as nvarchar) FROM '+@tbl+' WHERE len(cast('+@fld+' as nvarchar))='+convert(nvarchar(5),@maxlen)+')'

              EXEC SP_EXECUTESQL @sql,N'@sample varchar(30) OUTPUT',@sample OUTPUT

              --for quickly  

              --SET @sql=N'SET @sample=convert(varchar(20),(SELECT TOP 1 '+@fld+' FROM '+

                     --@tbl+' order by 1 desc ))' 

              PRINT @sql

              print @sample

              print @tbl

              EXEC SP_EXECUTESQL @sql,N'@sample nvarchar(30) OUTPUT',@sample OUTPUT

              INSERT INTO #tc SELECT *,ltrim(ISNULL(@maxlen,0)) as MaxLenUsed,

                     convert(nchar(20),ltrim(ISNULL(@sample,' '))) as Sample,' ' Comment FROM #t where TableName=@tbl and FieldName=@fld

       END

       FETCH NEXT FROM read_cursor INTO @tbl,@fld

END

CLOSE read_cursor

DEALLOCATE read_cursor

GO

SET ANSI_NULLS ON

GO

SET NOCOUNT OFF

GO

select count(*)  from #t

DROP TABLE #t

GO

select count(*)-1  from #tc

select * into ##tx from #tc order by tablename

DROP TABLE #tc

--select * from ##tx

declare @db nvarchar(60),@sql nvarchar(3000)

set @db=db_name()

--请修改用户名和口令 导出到Excel 中

set @sql='exec master.dbo.xp_cmdshell ''bcp ..dbo.##tx out c:\'+@db+'_exp.xls -w -C936 -Usa -Psa '''

print @sql

exec(@sql)

GO

DROP TABLE ##tx

GO