Question

在我的数据库中，数据以二进制格式存储，并且通过SQL查询，我在查询中使用CAST将其转换为XML。

现在，我想通过添加另一列来在SQL中获取XML文件。

注意：我不想将这些数据导出到文件位置，因为它具有大量记录。

使用的查询：

select 
  AR.Column1, 
  AR.Column2, 
  CAST (Message as XML) AS "XML FILE"
from 
  [dbo].[Table1] AP 
  INNER JOIN [DBName].[dbo].[Table2] AR ON AR.Column1=AP.Column1 
where 
  (AR.InsertedDate BETWEEN '2019-11-19 00:00:00.000' AND '2019-11-19 23:59:59.477') 
  and AR.Column2='Delta' order by InsertedDate desc

Answer 1

DATALENGTH与可存储可变长度数据的数据类型结合使用时非常有用，例如：

图片
  ntext
  nvarchar
  文字
  varbinary
  varchar

SELECT AR.Column1, AR.Column2, 
       CAST (Message as XML) AS "XML FILE",
       CASE WHEN DATALENGTH(Message) <= 1024 THEN CONVERT(NVARCHAR, DATALENGTH(Message)) + ' BYTES'
            WHEN DATALENGTH(Message) >1024 AND DATALENGTH(Message) <= 1048576 THEN CONVERT(NVARCHAR, DATALENGTH(Message)/1024) + ' KB'
            WHEN DATALENGTH(Message) >1048576 AND DATALENGTH(Message) <= 1073741824 THEN   CONVERT(NVARCHAR, DATALENGTH(Message)/1048576) + ' MB'
            WHEN DATALENGTH(Message) >1073741824 AND DATALENGTH(Message) <= 109951162777  THEN   CONVERT(NVARCHAR, DATALENGTH(Message)/1073741824) + ' GB'
            ELSE CONVERT(NVARCHAR, DATALENGTH(Message)/109951162777) + ' TB' END AS "XML FILE SIZE"
FROM  [dbo].[Table1] AP 
INNER JOIN [DBName].[dbo].[Table2] AR ON AR.Column1=AP.Column1 
WHERE  (AR.InsertedDate BETWEEN '2019-11-19 00:00:00.000' AND '2019-11-19 23:59:59.477') 
       AND AR.Column2='Delta' 
ORDER BY InsertedDate DESC

如何获取XML文件（存储在SQL DB中）大小？

1 个答案: