PDO::exec

(no version information, might be only in CVS)

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

Description

long PDO::exec ( string statement )

Ðñïåéäïðïßçóç

Αυτή η συνάρτηση είναι ΔΟΚΙΜΑΣΤΙΚΗ. Η συμπεριφορά της, το όνομα της και οτιδήποτε άλλο είναι τεκμηριωμένο σχετικά με αυτή την συνάρτηση μπορεί να αλλάξει χωρίς ειδοποίηση σε μελλοντικές εκδόσεις της PHP. Χρησιμοποιήστε αυτή την συνάρτηση με δικό σας ρίσκο.

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().

Parameters

statement

The SQL statement to prepare and execute.

Return Values

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.

Παραδείγματα

ÐáñÜäåéãìá 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.

Δείτε επίσης

PDO::prepare()
PDO::query()
PDOStatement::execute()