PDO::prepare
PDO::quote
PDO
PHP Manual

# PDO::query

(PHP 5 >= 5.1.0, PECL pdo >= 0.2.0)

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

### 설명

PDOStatement PDO::query ( string `$statement` )
PDOStatement PDO::query ( string `$statement` , int `$PDO::FETCH_COLUMN` , int `$colno` )
PDOStatement PDO::query ( string `$statement` , int `$PDO::FETCH_CLASS` , string `$classname` , array `$ctorargs` )
PDOStatement PDO::query ( string `$statement` , int `$PDO::FETCH_INTO` , object `$object` )

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().

If you do not fetch all of the data in a result set before issuing your next call to PDO::query(), your call may fail. Call PDOStatement::closeCursor() to release the database resources associated with the PDOStatement object before issuing your next call to PDO::query().

> Note: Although this function is only documented as having a single parameter, you may pass additional arguments to this function. They will be treated as though you called PDOStatement::setFetchMode() on the resultant statement object.

### 인수

`statement`

  The SQL statement to prepare and execute.

### 반환값

PDO::query() returns a PDOStatement object.

### 예제

Example #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";
}
}
?>`

위 예제의 출력:

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

### 참고

- PDO::exec() - Execute an SQL statement and return the number of affected rows
- PDO::prepare() - Prepares a statement for execution and returns a statement object
- PDOStatement::execute() - Executes a prepared statement

PDO::prepare
PDO::quote
PDO
PHP Manual