PDO :: prepare

PHP PDO Reference Manual

PDO :: prepare - prepare to execute SQL statement and returns a PDOStatement Objects (PHP 5> = 5.1.0, PECL pdo> = 0.1.0)

Explanation

grammar

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

To PDOStatement :: execute () method prepares to execute SQL statements, SQL statements can contain zero or more named (: name) or a question mark parameter markers, parameters will be replaced when SQL execution (?).

You can not contain both named in the SQL statement (: name) (?) Or a question mark parameter markers can only choose one style.

Pretreatment SQL statement parameter when using PDOStatement :: execute () method passes the real parameters.

parameter

statement
Valid SQL statement.

driver_options
This array contains one or more key => value pair to set PDOStatement object's properties, is most commonly used to PDO :: ATTR_CURSOR value to PDO :: CURSOR_SCROLL to request a scrollable cursor.

return value

If successful, PDO :: prepare () returns PDOStatement object returns FALSE if it fails or throws an exception PDOException.

Examples

Use a named (: name) parameter to prepare SQL statements

<?php
/* 通过数组值向预处理语句传递值 */
$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();
?>

Use a question mark (?) Parameter to prepare the SQL statement

<?php
/* 通过数组值向预处理语句传递值 */
$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();
?>

PHP PDO Reference Manual