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  <title>OTL 4.0, Introduction</title>
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<h1>OTL 4.0, Introduction</h1>
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<h1>
<a name="Introduction"></a>Introduction</h1>
This document describes the Oracle, Odbc and DB2-CLI Template Library,
Version 4.0 (OTL 4.0). OTL 4.0 is a C++ library based on templates. It
integrates all of the <a href="otl3_old.htm">previous releases</a>
into
one library.
<p>OTL 4.0 was designed as a combination of a C++ template framework
and
OTL-adapters. The framework is a generic implementation of the concept
of <a href="otl3_str.htm">OTL streams</a>. The OTL-adapters are thin
wrappers
around the database APIs and are used as <i>class type</i> parameters
to
be substituted into the template framework.
</p>
<p>OTL 4.0 covers the functionality of a whole database API with just a
handful of concrete classes: <a href="otl3_str.htm">otl_stream</a>, <a
 href="otl3_connect_class.htm">otl_connect</a>,
<a href="otl3_exception_class.htm">otl_exception</a>,
<a href="otl3_long_string.htm">otl_long_string</a>,
and several template PL/SQL (Oracle) table container classes, generated
from the template framework and the OTL-adapters.
</p>
<p>The OTL code gets expanded into direct database API function calls,
so it provides ultimate performance, reliability and thread safety in
multi-processor
environments as well as traditional batch programs. OTL 4.0, being a
template
library, is highly portable since it is self-sufficient and compact
enough.
</p>
<p>OTL 4.0 is ANSI C++ compliant (ANSI C++ typecasts, clean templatized
code, etc.), tightly integrated with the Standard Template Library
(STL)
via so-called STL-compliant <a href="otl3_iterators.htm">stream
iterators</a>,
and natively supports the STL <i>std::string</i>'s in <a
 href="otl3_str.htm">otl_stream</a>'s.
</p>
<p>The current version of the OTL supports Oracle 7 (natively via
OCI7),
Oracle 8 (natively via OCI8), Oracle 8i (natively via OCI8i), Oracle 9i
(natively via OCI9i), Oracle 10g
(natively via OCI10g), DB2 (natively via DB2 CLI), ODBC 3.x as well as
ODBC
2.5 compliant data sources in MS Windows and Unix (e.g. Oracle, MS SQL
Server, Sybase, Informix, MySQL, DB2, Interbase / Firebird, PostgreSQL,
SQLite,
SAP/DB, TimesTen, MS ACCESS, etc.).
The list of supported
database backends is constantly growing.
</p>
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<p>Copyright &copy; 1996, 2008, Sergei Kuchin, email: <a
 href="mailto:skuchin@aceweb.com">skuchin@aceweb.com</a>,
<a href="mailto:skuchin@gmail.com">skuchin@gmail.com
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