PDO::exec

Manuale PHP
Indietro		Avanti

Descrizione

long PDO::exec ( string statement )

Avvertimento

Questa funzione è SPERIMENTALE. Ovvero, il comportamento di questa funzione, il nome di questa funzione, in definitiva tutto ciò che è documentato qui può cambiare nei futuri rilasci del PHP senza preavviso. Siete avvisati, l'uso di questa funzione è a vostro rischio.

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

Elenco dei parametri

statement: The SQL statement to prepare and execute.

Valori restituiti

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.

Esempi

Esempio 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("Return number of rows that were deleted:\n"); print("Deleted $count rows.\n"); ?>
The above example will output:
Return number of rows that were deleted: Deleted 1 rows.

Vedere anche:

PDO::prepare()

PDO::query()

PDOStatement::execute()

Indietro	Partenza	Avanti
PDO::errorInfo	Risali	PDO::getAttribute