BUG: Cannot Update More Than 64K of Long Data

 Last reviewed: September 9, 1996
Article ID: Q118378
The information in this article applies to:
  • Microsoft Open Database Connectivity, version 1.0

BUG# ODBCDBASE: 2125 (1.01.1928)

SYMPTOMS

When using SQLPutData in chunks to update SQL_LONGVARBINARY o SQL_LONGVARCHAR data to 64K or greater with the ODBC Desktop Database drivers, the following message is received: 

   SQLState 22001
   [Microsoft][ODBC Single Tier Driver] Maximum SQLPutData length exceeded

WORKAROUND

Because inserts work but updates fail with the above operation, the only workaround is to make a copy of the row to updated, delete that row, and then insert the row again, along with the SQL_LONGVARCHAR or SQL_LONGVARBINARY data

STATUS

Microsoft has confirmed this to be a problem in the ODBC Desktop Database Drivers versions 1.01.1928 and 1.01.2115. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

According to the ODBC specification, SQLPutData can be used in chunks smaller than 64K to insert and update long data to the maximum limit set by that data source. This works for inserts with the Desktop Drivers, but fails for updates.

For instance, if SQLBindParamter is used to set the length of the total data to be sent during execution time at 96K and SQLPutData is called to send data in 32K chunks, the second call to SQLPutData will fail with the above message.

KBCategory: kbusage
KBSubcategory:

Additional reference words: 1.01.1928 1.01.2115 DDD Visual C++ Word Excel



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Last reviewed: September 9, 1996
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