<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <HTML ><HEAD ><TITLE >Qt</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="FreeTDS User Guide" HREF="index.htm"><LINK REL="UP" TITLE="How to get what works with it working" HREF="software.htm"><LINK REL="PREVIOUS" TITLE="Python" HREF="python.htm"><LINK REL="NEXT" TITLE="ODBC on Unix" HREF="uodbc.htm"><LINK REL="STYLESHEET" TYPE="text/css" HREF="userguide.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8"></HEAD ><BODY CLASS="SECT1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" ><SPAN CLASS="PRODUCTNAME" >FreeTDS</SPAN > User Guide: A Guide to Installing, Configuring, and Running <SPAN CLASS="PRODUCTNAME" >FreeTDS</SPAN ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="python.htm" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 7. How to get what works with it working</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="uodbc.htm" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="QT" >Qt</A ></H1 ><P ><SPAN CLASS="PRODUCTNAME" >Qt</SPAN > has two drivers to access SQL Server databases: QTDS and QODBC. At the time of writing (January 2010) QTDS has a performance problem because rather than maintaining a connection, it instead re-connects for every query. So use QODBC.</P ><P >There are however some problems with wide character support on Qt because Qt assumes sizeof(SQLWCHAR) == 2. On some DMs, though — including <SPAN CLASS="PRODUCTNAME" >iODBC</SPAN >, the default on <SPAN CLASS="PRODUCTNAME" >Ubuntu</SPAN > — sizeof(SQLWCHAR) == 4, which could lead to invalid character conversion.</P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="python.htm" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.htm" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="uodbc.htm" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Python</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="software.htm" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >ODBC on Unix</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
