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<title>Check whether the instance pointed by OID exists</title>
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<div class="refnamediv">
<h1 class="refname">cubrid_is_instance</h1>
<p class="verinfo">(PECL CUBRID >= 8.3.0)</p><p class="refpurpose"><span class="refname">cubrid_is_instance</span> — <span class="dc-title">Check whether the instance pointed by OID exists</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.cubrid-is-instance-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>cubrid_is_instance</strong></span>
( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$conn_identifier</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$oid</code></span>
)</div>
<p class="para rdfs-comment">
The <span class="function"><strong>cubrid_is_instance()</strong></span> function is used to check
whether the instance pointed by the given <em><code class="parameter">oid</code></em>
exists or not.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.cubrid-is-instance-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">conn_identifier</code></em></span>
<dd>
<p class="para">Connection identifier.</p></dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">oid</code></em></span>
<dd>
<p class="para">OID of the instance that you want to check the existence.</p></dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.cubrid-is-instance-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
1, if such instance exists;
</p>
<p class="para">
0, if such instance does not exist;
</p>
<p class="para">
-1, in case of error
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.cubrid-is-instance-examples">
<h3 class="title">Examples</h3>
<div class="example" id="example-1028">
<p><strong>Example #1 <span class="function"><strong>cubrid_is_instance()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$conn </span><span style="color: #007700">= </span><span style="color: #0000BB">cubrid_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #0000BB">33000</span><span style="color: #007700">, </span><span style="color: #DD0000">"demodb"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$sql </span><span style="color: #007700">= <<<EOD<br /></span><span style="color: #DD0000">SELECT host_year, medal, game_date <br />FROM game <br />WHERE athlete_code IN <br /> (SELECT code FROM athlete WHERE name='Thorpe Ian');<br /></span><span style="color: #007700">EOD;<br /><br /></span><span style="color: #0000BB">$req </span><span style="color: #007700">= </span><span style="color: #0000BB">cubrid_execute</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">, </span><span style="color: #0000BB">$sql</span><span style="color: #007700">, </span><span style="color: #0000BB">CUBRID_INCLUDE_OID</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$oid </span><span style="color: #007700">= </span><span style="color: #0000BB">cubrid_current_oid</span><span style="color: #007700">(</span><span style="color: #0000BB">$req</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$res </span><span style="color: #007700">= </span><span style="color: #0000BB">cubrid_is_instance </span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">, </span><span style="color: #0000BB">$oid</span><span style="color: #007700">);<br />if (</span><span style="color: #0000BB">$res </span><span style="color: #007700">== </span><span style="color: #0000BB">1</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"Instance pointed by </span><span style="color: #0000BB">$oid</span><span style="color: #DD0000"> exists.\n"</span><span style="color: #007700">;<br />} else if (</span><span style="color: #0000BB">$res </span><span style="color: #007700">== </span><span style="color: #0000BB">0</span><span style="color: #007700">){<br /> echo </span><span style="color: #DD0000">"Instance pointed by </span><span style="color: #0000BB">$oid</span><span style="color: #DD0000"> doesn't exist.\n"</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">"error\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">cubrid_disconnect</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above example will output:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
Instance pointed by @0|0|0 doesn't exist.
</pre></div>
</div>
</div>
</div>
<div class="refsect1 seealso" id="refsect1-function.cubrid-is-instance-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.cubrid-drop.html" class="function" rel="rdfs-seeAlso">cubrid_drop()</a> - Delete an instance using OID</span></li>
<li class="member"> <span class="function"><a href="function.cubrid-get-class-name.html" class="function" rel="rdfs-seeAlso">cubrid_get_class_name()</a> - Get the class name using OID</span></li>
</ul>
</p>
</div>
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