update : 2015.11.03
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Execute an SQL statement and return the number of affected rows
PDO
PHP Manual

PDO::exec

(PHP 5 >= 5.1.0, PECL pdo >= 0.1.0)

PDO::exec — Execute an SQL statement and return the number of affected rows

설명

public int PDO::exec ( string $statement )

PDO::exec() executes an SQL statement in a single function call, returning the number of rows affected by the statement.

PDO::exec() does not return results from a SELECT statement. For a SELECT statement that you only need to issue once during your program, consider issuing PDO::query(). For a statement that you need to issue multiple times, prepare a PDOStatement object with PDO::prepare() and issue the statement with PDOStatement::execute().

인수

statement

The SQL statement to prepare and execute.

Data inside the query should be properly escaped.

반환값

PDO::exec() returns the number of rows that were modified or deleted by the SQL statement you issued. If no rows were affected, PDO::exec() returns 0.

Warning

이 함수는 논리 FALSE를 반환하지만, 논리 FALSE로 취급할 수 있는 다른 값을 반환할 수 있습니다. 자세한 정보는 논리형 섹션을 참고하십시오. 이 함수의 반환값을 확인하려면 === 연산자를 이용하십시오.

The following example incorrectly relies on the return value of PDO::exec(), wherein a statement that affected 0 rows results in a call to die():

<?php
$db->exec() or die(print_r($db->errorInfo(), true));
?>

예제

Example #1 Issuing a DELETE statement

Count the number of rows deleted by a DELETE statement with no WHERE clause.

<?php
$dbh = new PDO('odbc:sample', 'db2inst1', 'ibmdb2');

/* Delete all rows from the FRUIT table */
$count = $dbh->exec("DELETE FROM fruit WHERE colour = 'red'");

/* Return number of rows that were deleted */
print("Deleted $count rows.\n");
?>

위 예제의 출력:

Deleted 1 rows.

참고

PDO
PHP Manual