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# PDO::prepare

(no version information, might be only in CVS)

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

## 说明

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

警告
本函数是实验性的。本函数的行为，包括函数名称以及其它任何关于本函数的文档可能会在没有通知的情况下随 PHP 以后的发布而改变。使用本函数风险自担。

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.

## 参数

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.

## 返回值

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

## 例

例子 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(); ?>`

例子 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(); ?>`

## 参见

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

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