Question

尝试拉回大量数据以填充JQGrid表的选择框过滤器，并且我遇到了这个溢出。

Msg 6522, Level 16, State 2, Line 1
A .NET Framework error occurred during execution of user-defined routine or aggregate "FormDelimitedString": 
System.Data.SqlTypes.SqlTypeException: The buffer is insufficient. Read or write operation failed.
System.Data.SqlTypes.SqlTypeException: 
   at System.Data.SqlTypes.SqlBytes.Write(Int64 offset, Byte[] buffer, Int32 offsetInBuffer, Int32 count)
   at System.Data.SqlTypes.StreamOnSqlBytes.Write(Byte[] buffer, Int32 offset, Int32 count)
   at System.IO.BinaryWriter.Write(String value)
   at SqlServerProject1.FormDelimitedString.Write(BinaryWriter w)

这是SQL：

 SELECT 
  dbo.formDelimitedString (DISTINCT v_mie_all.AREA) AS AREA, 
  dbo.formDelimitedString (DISTINCT v_mie_all.PROP_TYPE) AS PROP_TYPE, 
  dbo.formDelimitedString (DISTINCT ((SUBSTRING (v_mie_all.rp_code, 1, 4)))) AS REC_TYPE_USE_CODE, 
  dbo.formDelimitedString (DISTINCT v_mie_all.TRANS_CODE) AS TRANS_CODE, 
  --dbo.formDelimitedString (DISTINCT v_mie_all.MI_FUNDS_MGR) AS MI_FUNDS_MGR,
  dbo.formDelimitedString (DISTINCT v_mie_all.EQ_FUNDS_MGR) AS EQ_FUNDS_MGR, 
  dbo.formDelimitedString (DISTINCT v_mie_all.CNTRCT_ARNGMT) AS CNTRCT_ARNGMT,
  dbo.formDelimitedString (DISTINCT v_mie_all.SU_ID) AS SU_ID
FROM v_mie_all

以下是该功能的来源：

CREATE AGGREGATE [dbo].[FormDelimitedString]
(@value [nvarchar](4000))
RETURNS[nvarchar](4000)
EXTERNAL NAME [FormDelimitedString].[SqlServerProject1.FormDelimitedString]
GO

嗯，也许我可以将nvarchar4000增加到更大的值。

Answer 1

我现在正在使用它

SELECT Stuff((SELECT DISTINCT '|' + CAST(MY_COLUMN_NAME AS nvarchar)
 FROM   MY_TABLE_NAME 
 FOR xml path, type).value('.[1]', 'nvarchar(max)'), 1, 1, '') AS MY_COLUMN_NAME,

旧代码看起来像：

SELECT dbo.formDelimitedString (DISTINCT MY_COLUMN_NAME) AS MY_COLUMN_NAME,

如何增加MSSQL Server中用户定义函数溢出的缓冲区？

1 个答案: