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# PDO::query

(no version information, might be only in CVS)

PDO::query -- Executes an SQL statement, returning a result set as a PDOStatement object

## 说明

object PDO::query ( string statement )

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。

PDO::query() prepares and executes an SQL statement in a single function call, returning the result set (if any) returned by the statement as a PDOStatement object.

For a SELECT statement that you need to issue multiple times, prepare a PDOStatement object with PDO::prepare() and issue the statement with PDOStatement::execute().

## 参数

statement

  The SQL statement to prepare and execute.

## 返回值

PDO::query() returns a PDOStatement object.

## 例

例子 1. Demonstrate PDO::query

A nice feature of PDO::query() is that it enables you to iterate over the rowset returned by a successfully executed SELECT statement.

`<?php function getFruit($conn) { $sql = 'SELECT name, colour, calories FROM fruit ORDER BY name'; foreach ($conn->query($sql) as $row) { print $row['NAME'] . "\t"; print $row['COLOUR'] . "\t"; print $row['CALORIES'] . "\n"; } } ?>`

上例将输出：

    apple   red     150
    banana  yellow  250
    kiwi    brown   75
    lemon   yellow  25
    orange  orange  300
    pear    green   150
    watermelon      pink    90

## 参见

PDO::exec()
PDO::prepare()
PDOStatement::execute()

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