pdo.getattribute.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Retrieve a database connection attribute</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="pdo.exec.html">PDO::exec</a></div> <div class="next" style="text-align: right; float: right;"><a href="pdo.getavailabledrivers.html">PDO::getAvailableDrivers</a></div> <div class="up"><a href="class.pdo.html">PDO</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="pdo.getattribute" class="refentry"> <div class="refnamediv"> <h1 class="refname">PDO::getAttribute</h1> <p class="verinfo">(PHP 5 >= 5.1.0, PECL pdo:0.2-1.0.3)</p><p class="refpurpose"><span class="refname">PDO::getAttribute</span> — <span class="dc-title"> Retrieve a database connection attribute </span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <span class="methodname"><b><b>PDO::getAttribute</b></b></span> ( <span class="methodparam"><span class="type">int</span> <tt class="parameter">$attribute</tt></span> )</div> <p class="para rdfs-comment"> This function returns the value of a database connection attribute. To retrieve PDOStatement attributes, refer to <a href="pdostatement.getattribute.html" class="function">PDOStatement::getAttribute()</a>. </p> <p class="para"> Note that some database/driver combinations may not support all of the database connection attributes. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">attribute</tt></i></span> <dd> <p class="para"> One of the <i>PDO::ATTR_*</i> constants. The constants that apply to database connections are as follows: <ul class="simplelist"> <li class="member"><i>PDO::ATTR_AUTOCOMMIT</i></li> <li class="member"><i>PDO::ATTR_CASE</i></li> <li class="member"><i>PDO::ATTR_CLIENT_VERSION</i></li> <li class="member"><i>PDO::ATTR_CONNECTION_STATUS</i></li> <li class="member"><i>PDO::ATTR_DRIVER_NAME</i></li> <li class="member"><i>PDO::ATTR_ERRMODE</i></li> <li class="member"><i>PDO::ATTR_ORACLE_NULLS</i></li> <li class="member"><i>PDO::ATTR_PERSISTENT</i></li> <li class="member"><i>PDO::ATTR_PREFETCH</i></li> <li class="member"><i>PDO::ATTR_SERVER_INFO</i></li> <li class="member"><i>PDO::ATTR_SERVER_VERSION</i></li> <li class="member"><i>PDO::ATTR_TIMEOUT</i></li> </ul> </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> A successful call returns the value of the requested PDO attribute. An unsuccessful call returns <i>null</i>. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 Retrieving database connection attributes</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$conn </span><span style="color: #007700">= new </span><span style="color: #0000BB">PDO</span><span style="color: #007700">(</span><span style="color: #DD0000">'odbc:sample'</span><span style="color: #007700">, </span><span style="color: #DD0000">'db2inst1'</span><span style="color: #007700">, </span><span style="color: #DD0000">'ibmdb2'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$attributes </span><span style="color: #007700">= array(<br /> </span><span style="color: #DD0000">"AUTOCOMMIT"</span><span style="color: #007700">, </span><span style="color: #DD0000">"ERRMODE"</span><span style="color: #007700">, </span><span style="color: #DD0000">"CASE"</span><span style="color: #007700">, </span><span style="color: #DD0000">"CLIENT_VERSION"</span><span style="color: #007700">, </span><span style="color: #DD0000">"CONNECTION_STATUS"</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">"ORACLE_NULLS"</span><span style="color: #007700">, </span><span style="color: #DD0000">"PERSISTENT"</span><span style="color: #007700">, </span><span style="color: #DD0000">"PREFETCH"</span><span style="color: #007700">, </span><span style="color: #DD0000">"SERVER_INFO"</span><span style="color: #007700">, </span><span style="color: #DD0000">"SERVER_VERSION"</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">"TIMEOUT"<br /></span><span style="color: #007700">);<br /><br />foreach (</span><span style="color: #0000BB">$attributes </span><span style="color: #007700">as </span><span style="color: #0000BB">$val</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"PDO::ATTR_$val: "</span><span style="color: #007700">;<br /> echo </span><span style="color: #0000BB">$conn</span><span style="color: #007700">-></span><span style="color: #0000BB">getAttribute</span><span style="color: #007700">(</span><span style="color: #0000BB">constant</span><span style="color: #007700">(</span><span style="color: #DD0000">"PDO::ATTR_$val"</span><span style="color: #007700">)) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="pdo.setattribute.html" class="function" rel="rdfs-seeAlso">PDO::setAttribute()</a></li> <li class="member"><a href="pdostatement.getattribute.html" class="function" rel="rdfs-seeAlso">PDOStatement::getAttribute()</a></li> <li class="member"><a href="pdostatement.setattribute.html" class="function" rel="rdfs-seeAlso">PDOStatement::setAttribute()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="pdo.exec.html">PDO::exec</a></div> <div class="next" style="text-align: right; float: right;"><a href="pdo.getavailabledrivers.html">PDO::getAvailableDrivers</a></div> <div class="up"><a href="class.pdo.html">PDO</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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