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# PDO->exec()

(no version information, might be only in CVS)

PDO->exec() -- Execute an SQL statement and return the number of affected rows

## Descrição

class PDO {
int 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().

## Parâmetros

`statement`

  The SQL statement to prepare and execute.

## Valores de retornado

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`.

Atenção
Esta função pode retornar o booleano `FALSE`, mas também pode retornar um valor não-booleano que pode ser avaliado como `FALSE`, como `0` ou "". Leia a seção em Booleanos para maiores informações. Utilize o operador === para testar o valor retornado por esta função.

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 $db->exec() or die($db->errorInfo()); ?>`

## Exemplos

Exemplo 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"); ?>`
O exemplo acima irá imprimir:
    Deleted 1 rows.

## Veja também

PDO->prepare()
PDO->query()
PDOStatement->execute()

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