PHP对postgreSQL数据库进行增删查改,该怎么处理

$db = new PDO('pgsql:dbname=test host=localhost', $user, $pass);$db ->query('select ......');$db ->exec('insert ......');$db ->exec('update ......');$db ->exec('delete ......');
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PHP code
$db = new PDO('pgsql:dbname=test host=localhost', $user, $pass);
$db ->query('select ......');
$db ->exec('insert ......');
$db ->exec('update ......');
$db ->exec('delete ......');

不明白的翻……