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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

PDOStatement PDO::query ( string statement )

PDO::query() 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 query that you need to issue multiple times, you will realize better performance if you prepare a PDOStatement object using PDO::prepare() and issue the statement with multiple calls to PDOStatement::execute().

## 参数

statement

  The SQL statement to prepare and execute.

## 返回值

PDO::query() returns a PDOStatement object.

## 范例

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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