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PDOStatement :: execute

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PDOStatement :: execute - execute a prepared statement (PHP 5> = 5.1.0, PECL pdo> = 0.1.0)


Explanation

grammar

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

Implementation of prepared statements. If prepared statements containing parameter markers, you must select one of the following practices:

  • Call PDOStatement :: bindParam () to bind PHP variables to the parameter markers: if any, to pass through the input values and variables associated parameter markers bound to obtain an output value

  • Or just as a passing input parameter value array


parameter

input_parameters

A number of elements and parameters of the SQL statement to be executed as many bindings array. All values ​​are treated as PDO :: PARAM_STR.

You can not bind multiple values ​​to a single argument; for example, you can not bind two values ​​to the IN () clause in a single named parameter.

Bound value can not exceed the specified number. If there is more than PDO :: prepare () and more key name specified in the SQL preprocessing input_parameters, then this statement will fail with an error.


return value

Successful return TRUE, or on failure returns FALSE.


Examples

Execute a prepared statement bind variables

<?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();
?>

Use an array containing the insert value is executed as a prepared statement (named parameters)

<?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));
?>

Use an array containing the insert value is executed as a prepared statement (placeholders)

<?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));
?>

Implementation of a question mark placeholders in the prepared statement

<?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();
?>

Using arrays to execute a prepared statement containing the IN clause

<?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);
?>

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