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<h1>16. Runtime Hosting</h1>
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<h2>16.1. Runtime Environments</h2>
<p>The Virtuoso server in its standard build is a single executable. To
allow for external customizations based on VSEs the Virtuoso server engine
becomes a callable library, the main function is re-written to incorporate other
libraries and a new executable is created.
For example, a Virtuoso server
that contains PHP support under Windows consists of: </p>
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<pre class="programlisting">
65K virtuoso-odbc-php-t.exe
5.2M libvirtuoso-odbc-t.dll
1.2M php4ts.dll
</pre>
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<p>which replaces the usual <span class="computeroutput">7M virtuoso-odbc-t.exe</span>.
<span class="computeroutput">virtuoso.odbc-php-t.exe</span> is then executed
in the usual way.</p>
<p>The Linux counterpart would be an
<span class="computeroutput">8M virtuoso-odbc-php-t</span> binary.</p>
<p>The Virtuoso executable files provided in the installer are appropriately
named to indicate which customizations are supported. e.g. one that
contains "php" and "clr" in the file name has been built with PHP and
CLR support.</p>
<p>The location of the support libraries (.DLL's) for the various
customizations of Virtuoso on Windows must either be in the %PATH%;
environment variable or be the same directory as the virtuoso .EXE file.
Virtuoso will not be able to start otherwise.</p>
<div class="note">
<div class="notetitle">Note:</div>
<p>If Virtuoso is starting as a system service then the
SYSTEM PATH must be altered as opposed to the USER PATH. The USER PATH
is appropriate to alter if Virtuoso is being started as that user, usually when
in debug/foreground mode. This is applicable to any required environment
variables, not just PATH.</p>
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<p>Hosted environments that require SQL access back to the database can
make use of the in-process client mechanism. Hosted Runtimes such as PHP
and ASP .Net would ordinarily use an RPC based (ODBC) connection. To improve
the efficiency of the system, keeping it all in-process, a special connection
can be made with no alteration to the API used in the code for communication.</p>
<div class="tip">
<div class="tiptitle">See Also:</div>
<p>The <a href="inprocess.html">In-Process Client</a> keeps connections
within Virtuoso avoiding unnecessary RPCs.</p>
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