PDO::prepare

(no version information, might be only in CVS)

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

Leírás

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

Figyelem

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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. You cannot use named and question mark parameter markers within the same SQL statement.

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.

Paraméterek

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.

Visszatérési értékek

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

Példák

Példa 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();
?>

Példa 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();
?>

Lásd még

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