Gecko [ www.utparral.edu.mx ]

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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--
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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--
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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--
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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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install.htm	5.59 KB	-rw-r--r--
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logging.htm	7.35 KB	-rw-r--r--
mailinglist.htm	4.1 KB	-rw-r--r--
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odbc.api.summary.htm	16.65 KB	-rw-r--r--
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programming.htm	2.76 KB	-rw-r--r--
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software.htm	5.79 KB	-rw-r--r--
stunnel.htm	4.11 KB	-rw-r--r--
sybsql.htm	4.56 KB	-rw-r--r--
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troubleshooting.htm	10.84 KB	-rw-r--r--
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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 : what.htm

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<HTML
><HEAD
><TITLE
>What is FreeTDS?</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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TITLE="About this User Guide"
HREF="about.htm"><LINK
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><BODY
CLASS="CHAPTER"
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BORDER="0"
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><TR
><TH
COLSPAN="3"
ALIGN="center"
>FreeTDS User Guide: A Guide to Installing, Configuring, and Running FreeTDS</TH
></TR
><TR
><TD
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><A
HREF="about.htm"
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>Prev</A
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>Next</A
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><HR
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WIDTH="100%"></DIV
><DIV
CLASS="CHAPTER"
><H1
><A
NAME="WHAT"
></A
>Chapter 1. What is FreeTDS?</H1
><DIV
CLASS="TOC"
><DL
><DT
>Table of Contents</DT
><DT
><A
HREF="what.htm#TDSPROTOCOLHIST"
>Background: The <ACRONYM
CLASS="ACRONYM"
>TDS</ACRONYM
> Protocol
			and related <ACRONYM
CLASS="ACRONYM"
>API</ACRONYM
>s</A
></DT
><DT
><A
HREF="tdshistory.htm"
>History of <ACRONYM
CLASS="ACRONYM"
>TDS</ACRONYM
> Versions</A
></DT
><DT
><A
HREF="freetdshistory.htm"
>History of FreeTDS</A
></DT
><DT
><A
HREF="projects.htm"
>Current Projects, Language Bindings, and Alternatives</A
></DT
></DL
></DIV
>FreeTDS is re-implementation of C libraries originally marketed by Sybase and Microsoft SQL Server. It allows many open source applications such as Perl and PHP (or your own C or C++ program) to connect to Sybase or Microsoft SQL Server. FreeTDS provides drop-in replacements for

<UL
><LI
>Sybase's DB-Library and CT-Library</LI
><LI
>Microsoft's DB-Library (which differs in small details from Sybase's)</LI
><LI
>the ODBC drivers from both vendors</LI
><LI
>interactive SQL and BCP utilities</LI
></UL
>

The "TDS" part of the name comes from name of the protocol used to communicate with such servers: the Tabular Data Stream. FreeTDS is distributed in source code form, and is expected to compile on just about any operating system. That means every form of Unix&reg; and Unix-like&trade; system (including notable variants such as Interix&reg; and QNX&reg;), as well as Win32&reg;, VMS&reg;, and OS X&reg;. If it doesn't compile on your system &mdash; and you're not using MS-DOS&reg; &mdash; it's probably considered a bug.<DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="TDSPROTOCOLHIST"
>Background: The <ACRONYM
CLASS="ACRONYM"
>TDS</ACRONYM
> Protocol
			and related <ACRONYM
CLASS="ACRONYM"
>API</ACRONYM
>s</A
></H1
><ACRONYM
CLASS="ACRONYM"
>TDS</ACRONYM
> is a protocol, a set of rules describing how to transmit data between two computers. Like any protocol, it defines the types of messages that can be sent, and the order in which they may be sent. Protocols describe the "bits on the wire", how data flow.In reading this manual, it may be helpful to keep in mind that a protocol is not an <ACRONYM
CLASS="ACRONYM"
>API</ACRONYM
>, although the two are related. The server recognizes and speaks a protocol; anything that can send it the correct combination of bytes in the right order can communicate with it. But programmers aren't generally in the business of sending bytes; that's the job of a library. Over the years, there have been a few libraries &mdash; each with its own <ACRONYM
CLASS="ACRONYM"
>API</ACRONYM
> &mdash; that do the work of moving SQL through a <ACRONYM
CLASS="ACRONYM"
>TDS</ACRONYM
> pipe. ODBC, DB-Library, and CT-Library have very different <ACRONYM
CLASS="ACRONYM"
>API</ACRONYM
>s, but they're all one to the server, because on the wire they speak <ACRONYM
CLASS="ACRONYM"
>TDS</ACRONYM
>.The <ACRONYM
CLASS="ACRONYM"
>TDS</ACRONYM
> protocol was designed and developed by Sybase Inc. for their Sybase SQL Server relational database engine in 1984. The problem Sybase faced then still exists: There was no commonly accepted application-level protocol to transfer data between a database server and its client. To encourage the use of their product, Sybase came up with DB-Library.DB-Library provided an <ACRONYM
CLASS="ACRONYM"
>API</ACRONYM
> to the client program, and communicated with the server. What it sent to the server took the form of a stream of bytes meant for tables of data, a Tabular Data Stream.In 1990 Sybase entered into a technology sharing agreement with Microsoft which resulted in Microsoft marketing its own SQL Server. Microsoft kept the DB-Library <ACRONYM
CLASS="ACRONYM"
>API</ACRONYM
> and added ODBC. (Microsoft has since added other <ACRONYM
CLASS="ACRONYM"
>API</ACRONYM
>s, too. It no longer supports its own DB-Library implementation.) At about the same time, Sybase introduced a more powerful "successor" to DB-Library, called CT-Library, and called the pair OpenClient.CT-Library, DB-Library, and ODBC are <ACRONYM
CLASS="ACRONYM"
>API</ACRONYM
>s that &mdash; however different their programming style may be &mdash; all communicate with the server in the same way. The language they use is <ACRONYM
CLASS="ACRONYM"
>TDS</ACRONYM
>.The <ACRONYM
CLASS="ACRONYM"
>TDS</ACRONYM
> protocol comes in several flavors, most of which were not openly documented. If anything, it was considered to be something like a trade secret, or at least proprietary technology. The exception is <ACRONYM
CLASS="ACRONYM"
>TDS</ACRONYM
> 5.0, used exclusively by Sybase, for which documentation is available <A
HREF="http://crm.sybase.com/sybase/www/ESD/tds_spec_download.jsp"
TARGET="_top"
>from Sybase</A
>.</DIV
></DIV
><DIV
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><HR
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WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
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>Prev</A
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>About this User Guide</TD
><TD
WIDTH="34%"
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>&nbsp;</TD
><TD
WIDTH="33%"
ALIGN="right"
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>History of <ACRONYM
CLASS="ACRONYM"
>TDS</ACRONYM
> Versions</TD
></TR
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>

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Code Editor : what.htm