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POPDO Execute Returns Nothing
 

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    <p>Assume that I have a class:</p> <pre><code>class pdoc { private static $db_connect_pool; public static function openConnect() { try { $connect_options_arr = array(PDO::ATTR_PERSISTENT =&gt; true); self::$db_connect_pool[''.DB_DRIVER.'_'.DB_NAME.''] = new PDO("".DB_DRIVER.":host=".DB_HOST.";db_name=".DB_NAME."", DB_USER, DB_PASS, $connect_options_arr); } catch (Exception $e) { print_r($e); } } public static function getConnection() { return self::$db_connect_pool[''.DB_DRIVER.'_'.DB_NAME.'']; } public static function qry($sql) { self::openConnect(); $db_handle = self::getConnection(); $st_handle = $db_handle-&gt;prepare($sql); return $st_handle-&gt;execute(); } } </code></pre> <p>Then, to call the class:</p> <pre><code>$sql = "SELECT * FROM sometable"; if(pdoc::qry($sql)) echo "y"; else echo "n"; </code></pre> <p>Why the code always return <code>n</code>? I have check the connection that has been connected successfully, but while I've tried to execute some query, it returns nothing. Any ideas? Thanks.</p> <hr> <h2>UPDATE <i>(@Robbie's code)</i></h2> <pre><code>class pdoc { private static $db_connect_pool; public static function openConnect() { try { $connect_options_arr = array(PDO::ATTR_PERSISTENT =&gt; true, PDO::ATTR_ERRMODE =&gt; PDO::ERRMODE_EXCEPTION); self::$db_connect_pool[''.DB_DRIVER.'_'.DB_NAME.''] = new PDO("".DB_DRIVER.":host=".DB_HOST.";db_name=".DB_NAME."", DB_USER, DB_PASS, $connect_options_arr); } catch (Exception $e) { print_r($e); } } public static function getConnection() { return self::$db_connect_pool[''.DB_DRIVER.'_'.DB_NAME.'']; } public static function qry($sql) { self::openConnect(); $db_handle = self::getConnection(); try { $st_handle = $db_handle-&gt;prepare($sql); $retval = $st_handle-&gt;execute(); //--&gt; Got error on this line } catch (Exception $e) { Die('Need to handle this error. $e has all the details'); } return $retval; } } </code></pre> <p>The error said: <code>exception 'PDOException' with message 'SQLSTATE[3D000]: Invalid catalog name: 1046 No database selected'</code>.</p> <hr> <h2>ANSWER</h2> <p>Change:</p> <pre><code>... new PDO("".DB_DRIVER.":host=".DB_HOST.";db_name=".DB_NAME."", ... </code></pre> <p>into:</p> <pre><code>... new PDO("".DB_DRIVER.":host=".DB_HOST.";dbname=".DB_NAME."", ... </code></pre> <p>After catch the error message (from the updated code) and referring to <a href="https://stackoverflow.com/questions/6300446/write-php-pdo-queries-as-dbname-tablename-as-opposed-to-tablename-why">this thread</a>, I found that <code>dbname</code> part has written as <code>dn_name</code> on my code. So I change it into <code>dbname</code> and it works perfect! Thanks @Robbie for your code! :)</p>
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