pdostatement::execute PHP PDOStatement::execute讲解

bool PDOStatement::execute ([ array $input_parameters ] )

<?php
/* 通过绑定 PHP 变量执行一条预处理语句 */
$calories = 150;
$colour = 'red';
$sth = $dbh->prepare('SELECT name, colour, calories
 FROM fruit
 WHERE calories < :calories AND colour = :colour');
$sth->bindParam(':calories', $calories, PDO::PARAM_INT);
$sth->bindParam(':colour', $colour, PDO::PARAM_STR, 12);
$sth->execute();
?>

<?php
/* 通过传递一个含有插入值的数组执行一条预处理语句 */
$calories = 150;
$colour = 'red';
$sth = $dbh->prepare('SELECT name, colour, calories
 FROM fruit
 WHERE calories < :calories AND colour = :colour');
$sth->execute(array(':calories' => $calories, ':colour' => $colour));
?>

<?php
/* 通过传递一个插入值的数组执行一条预处理语句 */
$calories = 150;
$colour = 'red';
$sth = $dbh->prepare('SELECT name, colour, calories
 FROM fruit
 WHERE calories < ? AND colour = ?');
$sth->execute(array($calories, $colour));
?>

<?php
/* 通过绑定 PHP 变量执行一条预处理语句 */
$calories = 150;
$colour = 'red';
$sth = $dbh->prepare('SELECT name, colour, calories
 FROM fruit
 WHERE calories < ? AND colour = ?');
$sth->bindParam(1, $calories, PDO::PARAM_INT);
$sth->bindParam(2, $colour, PDO::PARAM_STR, 12);
$sth->execute();
?>

<?php
/* 使用一个数组的值执行一条含有 IN 子句的预处理语句 */
$params = array(1, 21, 63, 171);
/* 创建一个填充了和params相同数量占位符的字符串 */
$place_holders = implode(',', array_fill(0, count($params), '?'));
/*
 对于 $params 数组中的每个值，要预处理的语句包含足够的未命名占位符 。
 语句被执行时， $params 数组中的值被绑定到预处理语句中的占位符。
 这和使用 PDOStatement::bindParam() 不一样，因为它需要一个引用变量。
 PDOStatement::execute() 仅作为通过值绑定的替代。
*/
$sth = $dbh->prepare("SELECT id, name FROM contacts WHERE id IN ($place_holders)");
$sth->execute($params);
?>