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Q137536: PRB: SQL PacketSize Property May Not Work w/Individual Handles

Article: Q137536
Product(s): Microsoft FoxPro
Version(s): WINDOWS:2.5,3.0
Operating System(s): 
Keyword(s): kbvfp300 kbMDAC250
Last Modified: 23-FEB-2000

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The information in this article applies to:

- Microsoft Visual FoxPro for Windows, version 3.0 
- Microsoft Data Access Components version 2.5 
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SYMPTOMS
========

After you use the SQLSETPROP command to change the packet size of an ODBC
connection, the SQLGETPROP command for the packet size returns the original
value of the packet size. The expected behavior is that SQLGETPROP would return
the new packet size as set in the SQLSETPROP command.

CAUSE
=====

This behavior occurs because some drivers and servers do not support changing
the packet size on an active connection. In these situations, it is necessary to
change the default packet size prior to making each connection. This is
discussed in detail in the "Workaround" section of this article.

RESOLUTION
==========

The following workaround precludes setting up ODBC data sources connect1 and
connect2. These can be SQL, Oracle, or other ODBC connections.

Use the following commands to set individual packet sizes:

     =SQLSETPROP(0,'packetsize',8192) && 0 means default handle
     handle1=SQLCONNECT('connect1','username','password')
     paksize1=SQLGETPROP(handle1,'packetsize')

NOTE: packsize1 will return 8192

     =SQLSETPROP(0,'packetsize',4096) && 0
     handle2=SQLCONNECT('connect2','username','password')
     paksize2=SQLGETPROP(handle2,'packetsize')

NOTE: packsize2 will return 4096

STATUS
======

This behavior is by design.

MORE INFORMATION
================

The following steps illustrate the behavior of ineffective, individual packet
size settings:

Steps to Reproduce Behavior
---------------------------

     handle1=SQLCONNECT('connect1','username','password')
     =SQLSETPROP(handle1,'packetsize',8192 &&
     paksize1=SQLGETPROP(handle1,'packetsize')

NOTE: packsize1 will return 4096

     handle2=SQLCONNECT('connect2','username','password')
     =SQLSETPROP(handle2,'packetsize',8192 &&
     paksize2=SQLGETPROP(handle2,'packetsize')

NOTE: packsize2 will return 4096

Additional query words: different each separate single VFoxWin

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Keywords          : kbvfp300 kbMDAC250 
Technology        : kbVFPsearch kbAudDeveloper kbMDACSearch kbMDAC250 kbVFP300
Version           : WINDOWS:2.5,3.0
Issue type        : kbprb

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