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Rasi
answered Nov 30 '-1 00:00
$dsn = 'mysql:dbname=testdb;host=127.0.0.1';
$user = 'dbuser';
$password = 'dbpass';
try {
$dbh = new PDO($dsn, $user, $password);
} catch (PDOException $e) {
echo 'Connection failed: ' . $e->getMessage();
}
$PDOstmt= $db->prepare($query);
PDO :: prepare return PDOStatement object.
prepared statement only executed by PDOStatement::execute() method.
mostly prepare statement contain ":name" or "?" (question mark) to replace with real value at execution time. PDOStatement::execute() method do all replacement and execute the SQL query .
so use execute() function instead of exec() function
$PDOstmt->execute();
if you are running create or insert or update query than execute will do run it . but if you want to fetch data from database for select query . execute only create resultset and you need to fetch the data by another function
fetch() and fetchall() function will used to fetch the data
$PDOstmt->execute();
$PDOstmt->fetch();
PDOStatement::fetch() function will fetch data from resulset , it return one row at at time
$PDOstmt->execute();
$PDOstmt->fetchall();
PDOStatement::fetchall() function will fetch data from resulset , it return all data for given SQL query.