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<h1>22. Virtuoso Functions Guide - tmp_file_name</h1>
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<h2>tmp_file_name</h2>
<div class="refpurpose">returns the unique file name within temporary directory of the operating system</div>
<div class="funcsynopsis">
<span class="funcdef">varchar <span class="function">tmp_file_name</span>
</span>
(<span class="paramdef">in <span class="parameter">prefix</span> varchar</span>,
<span class="paramdef">in <span class="parameter">suffix</span> varchar</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>
The following function is used to obtain unique name of a file, which is located in
temporary directory on file system. The two optional parameters can be supplied:
prefix of the file and extension for it. These will be prepended and appended (dot MUST be omitted) to the unique string.
The directory where this file is located depends of $TMPDIR or %TMP% environment settings for UNIX's and Windows platforms respectively. If these environment settings are not available or empty, the defaults will be used for the
operation system. (in practice for most UNIX's it's /tmp or /var/tmp directory).
Note that this function do NOT open the file, it only give us a name.
</p>
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<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">prefix – </span>
prefix to the file name to be added. MUST be at most five characters.
</div>
<div class="refsect2">
<span class="refsect2title">suffix – </span>
extension to the file to be added, the leading dot MUST be omitted.
</div>
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<div class="refsect1title">Errors</div>
<p>
<a href="errors.html#datatypeerror">Parameter data type checking errors</a>
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<p />
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="ex_tmp_file_name" />
<div class="example">
<div class="exampletitle">Getting a unique file name</div>
<div>
<pre class="programlisting">
SQL> select tmp_file_name('FOO', 'EXT');
callret
VARCHAR
________________________________________
/tmp/FOOFoCnq5.EXT
1 Rows. -- 7 msec.
</pre>
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