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Name	Size	Permission
about.htm	5.13 KB	-rw-r--r--
aboutunicode.htm	6.69 KB	-rw-r--r--
acknowledgments.htm	4.39 KB	-rw-r--r--
advocacy.htm	3.67 KB	-rw-r--r--
ambition.htm	3.52 KB	-rw-r--r--
apireference.htm	4.71 KB	-rw-r--r--
appendmode.htm	4.1 KB	-rw-r--r--
askingforhelp.htm	5.36 KB	-rw-r--r--
build.htm	4.73 KB	-rw-r--r--
choosingtdsprotocol.htm	6.62 KB	-rw-r--r--
config.htm	17.16 KB	-rw-r--r--
configs.htm	4.9 KB	-rw-r--r--
confirminstall.htm	16.33 KB	-rw-r--r--
contrib.htm	5.98 KB	-rw-r--r--
contributors.htm	2.47 KB	-rw-r--r--
ctlib.api.summary.htm	14.88 KB	-rw-r--r--
dblib.api.summary.htm	28.32 KB	-rw-r--r--
domains.htm	6.22 KB	-rw-r--r--
dsnless.htm	5.96 KB	-rw-r--r--
envvar.htm	6.93 KB	-rw-r--r--
freetdsconf.htm	18.39 KB	-rw-r--r--
freetdshistory.htm	4.45 KB	-rw-r--r--
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help.htm	5.31 KB	-rw-r--r--
index.htm	23.65 KB	-rw-r--r--
index.html	23.65 KB	-rw-r--r--
install.htm	5.59 KB	-rw-r--r--
interfacesfile.htm	3.64 KB	-rw-r--r--
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isolatecause.htm	4.39 KB	-rw-r--r--
kerberos.htm	3.92 KB	-rw-r--r--
light.taper.htm	3.03 KB	-rw-r--r--
linker.conclusion.htm	2.75 KB	-rw-r--r--
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linker.library.check.htm	5.31 KB	-rw-r--r--
locales.htm	6.89 KB	-rw-r--r--
localization.htm	11.32 KB	-rw-r--r--
logging.htm	7.35 KB	-rw-r--r--
mailinglist.htm	4.1 KB	-rw-r--r--
name.lookup.htm	4.14 KB	-rw-r--r--
odbc.api.summary.htm	16.65 KB	-rw-r--r--
odbcconnattr.htm	7.31 KB	-rw-r--r--
odbcdiagnose.htm	8.88 KB	-rw-r--r--
odbcinionly.htm	3.47 KB	-rw-r--r--
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perl.htm	7.36 KB	-rw-r--r--
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programming.htm	2.76 KB	-rw-r--r--
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python.htm	4.01 KB	-rw-r--r--
qt.htm	2.69 KB	-rw-r--r--
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serverthere.htm	6.59 KB	-rw-r--r--
software.htm	5.79 KB	-rw-r--r--
stunnel.htm	4.11 KB	-rw-r--r--
sybsql.htm	4.56 KB	-rw-r--r--
tdshistory.htm	5.16 KB	-rw-r--r--
tdspool.htm	7.72 KB	-rw-r--r--
troubleshooting.htm	10.84 KB	-rw-r--r--
unicodefreetds.htm	4.96 KB	-rw-r--r--
unicodegoodbad.htm	4.99 KB	-rw-r--r--
unicode.htm	4.07 KB	-rw-r--r--
unicodeutf.htm	5.32 KB	-rw-r--r--
uodbc.htm	5.7 KB	-rw-r--r--
uothread.htm	3.19 KB	-rw-r--r--
usefreetds.htm	6.26 KB	-rw-r--r--
userguide.css	295 B	-rw-r--r--
what.htm	7.85 KB	-rw-r--r--

Code Editor : uodbc.htm

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<HTML
><HEAD
><TITLE
>ODBC on Unix</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
REL="HOME"
TITLE="FreeTDS User Guide"
HREF="index.htm"><LINK
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><BODY
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BGCOLOR="#FFFFFF"
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><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
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><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="qt.htm"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
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>Chapter 7. How to get what works with it working</TD
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>Next</A
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><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="UODBC"
>ODBC on Unix</A
></H1
><P
><SPAN
CLASS="SYSTEMITEM"
>ODBC</SPAN
> has some issues on Unix, mainly due to lack of clean specifications.</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="UODBC.64"
>ODBC and 64-bit</A
></H2
><P
>ODBC was originally specified as 32-bit<A
NAME="AEN2887"
HREF="#FTN.AEN2887"
><SPAN
CLASS="footnote"
>[1]</SPAN
></A
>.  Its evolution to 64-bit took place in the absence of a good specification which led to conflicting declarations and associated problems.  For instance, some parameters are defined as SQLINTEGER but are used for pointer offsets.   But SQLINTEGER was (and remains) 32-bit, while pointer offsets must be 64-bit.  Also row numbers and some other formerly 32-bit quantities are now 64-bit.</P
><P
>If you use <SPAN
CLASS="PRODUCTNAME"
>unixODBC</SPAN
> Frediano would recommend at least version 2.2.14. Earlier versions have issues if used on 64-bit environments.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="UODBC.WCHAR"
>sizeof(SQLWCHAR)</A
></H2
><P
>Under Windows <TT
CLASS="LITERAL"
>sizeof(wchar_t) == sizeof(SQLWCHAR) == 2</TT
> but on many Unix systems you have <TT
CLASS="LITERAL"
>sizeof(wchar_t) == 4</TT
>.  And some DMs decided to keep <TT
CLASS="LITERAL"
>sizeof(SQLWCHAR) == 2</TT
> (including <SPAN
CLASS="PRODUCTNAME"
>unixODBC</SPAN
>) while in other DM <TT
CLASS="LITERAL"
>sizeof(SQLWCHAR) == sizeof(wchar_t) == 4</TT
> (namely <SPAN
CLASS="PRODUCTNAME"
>iODBC</SPAN
>). This leads to incompatible ABIs between applications and drivers. If you compile the <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> ODBC driver using <SPAN
CLASS="PRODUCTNAME"
>iODBC</SPAN
> take care to ensure all drivers are compiled with the same header files.</P
><P
>Alternatively, compile <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> with both includes and rename the library to use two ABIs (for instance having a <TT
CLASS="FILENAME"
>libtdsiodbc.so</TT
> and a <TT
CLASS="FILENAME"
>libtdsuodbc.so</TT
>).</P
><P
>At the time of writing <SPAN
CLASS="PRODUCTNAME"
>Ubuntu</SPAN
> compiled Qt using <SPAN
CLASS="PRODUCTNAME"
>iODBC</SPAN
> but most packages use <SPAN
CLASS="PRODUCTNAME"
>unixODBC</SPAN
>. If you plan to use Qt with the <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> <SPAN
CLASS="SYSTEMITEM"
>ODBC</SPAN
> driver, you should have an <SPAN
CLASS="PRODUCTNAME"
>iODBC</SPAN
>-compatible driver. Also be aware that the QODBC Qt driver has problems with <SPAN
CLASS="PRODUCTNAME"
>iODBC</SPAN
> and <TT
CLASS="LITERAL"
>SQLWCHAR</TT
> (see <A
HREF="qt.htm"
>Qt</A
>). Due to these problems Frediano suggests not using this configuration (Qt database) on <SPAN
CLASS="PRODUCTNAME"
>Ubuntu</SPAN
> at this time.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="UODBC.CHAR"
>Default charset</A
></H2
><P
>Character encoding is yet another trap.  ODBC makes no provision for specifying client character encoding. By default many DM converting from multi-byte to wide characters assume the client uses ISO 8859-1.  Even the <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> driver assumes ISO 8859-1 by default.  Also some DM have problems converting multi-byte encodings (like UTF-8), by assuming a byte can be converted to a single wide character (and vice versa). That creates problems if you use multi-byte encoding for <SPAN
CLASS="PRODUCTNAME"
>FreeTDS</SPAN
> driver.</P
></DIV
></DIV
><H3
CLASS="FOOTNOTES"
>Notes</H3
><TABLE
BORDER="0"
CLASS="FOOTNOTES"
WIDTH="100%"
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
WIDTH="5%"
><A
NAME="FTN.AEN2887"
HREF="uodbc.htm#AEN2887"
><SPAN
CLASS="footnote"
>[1]</SPAN
></A
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
WIDTH="95%"
><P
>In fact, the earliest versions were 16-bit.</P
></TD
></TR
></TABLE
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>

${this.title}

Code Editor : uodbc.htm