PDO::prepare

(no version information, might be only in CVS)

PDO::prepare --  Prepares a statement for execution and returns a statement object

Descripción

PDOStatement PDO::prepare ( string statement [, array driver_options] )

Aviso

Esta función es EXPERIMENTAL. Esto significa que el comportamiento de esta función, el nombre de esta función y en definitiva TODO lo documentado sobre esta función, puede cambiar en una futura version de PHP SIN AVISO. La advertencia queda hecha, y utilizar esta extensión queda bajo su propia responsabilidad.

Prepares an SQL statement to be executed by the PDOStatement::execute() method. The SQL statement can contain zero or more named (:name) or question mark (?) parameter markers for which real values will be substituted when the statement is executed.

Calling PDO::prepare() and PDOStatement::execute() for statements that will be issued multiple times with different parameter values optimizes the performance of your application and helps prevent SQL injection attacks.

Lista de parámetros

statement

This must be a valid SQL statement for the target database server.

driver_options

This array holds one or more key=>value pairs to set attribute values for the PDOStatement object that this method returns. You would most commonly use this to set the PDO_ATTR_CURSOR value to PDO_CURSOR_SCROLL to request a scrollable cursor.

Valores retornados

If the database server successfully prepares the statement, PDO::prepare() returns a PDOStatement object.

Ejemplos

Ejemplo 1. Prepare an SQL statement with named parameters

<?php
/* Execute a prepared statement by passing an array of values */
$sql = 'SELECT name, colour, calories
    FROM fruit
    WHERE calories < :calories AND colour = :colour'
$sth = $dbh->prepare($sql, array(PDO_ATTR_CURSOR, PDO_CURSOR_FWDONLY));
$sth->execute(array(':calories' => 150, ':colour' => 'red'));
$red = $sth->fetchAll();
$sth->execute(array(':calories' => 175, ':colour' => 'yellow'));
$yellow = $sth->fetchAll();
?>

Ejemplo 2. Prepare an SQL statement with question mark parameters

<?php
/* Execute a prepared statement by passing an array of values */
$sth = $dbh->prepare('SELECT name, colour, calories
    FROM fruit
    WHERE calories < ? AND colour = ?'
);
$sth->execute(array(150, 'red'));
$red = $sth->fetchAll();
$sth->execute(array(175, 'yellow'));
$yellow = $sth->fetchAll();
?>

Ver también

PDO::exec()
PDO::query()
PDOStatement::execute()