PDOStatement::rowCount
(no version information, might be only in CVS)
PDOStatement::rowCount --
Returns the number of rows affected by the last SQL statement
Description
int
PDOStatement::rowCount ( void )
PDOStatement::rowCount() returns the number of
rows affected by the last DELETE, INSERT, or UPDATE statement
executed by the corresponding PDOStatement object.
If the last SQL statement executed by the associated
PDOStatement was a SELECT statement, some databases
may return the number of rows returned by that statement. However, this
behaviour is not guaranteed for all databases and should not be relied
on for portable applications.
Examples
Example 1. Return the number of deleted rows
PDOStatement::rowCount() returns the number of
rows affected by a DELETE, INSERT, or UPDATE statement.
<?php
/* Delete all rows from the FRUIT table */
$del = $dbh->prepare('DELETE FROM fruit');
$del->execute();
/* Return number of rows that were deleted */
print("Return number of rows that were deleted:\n");
$count = $del->rowCount();
print("Deleted $count rows.\n");
?>
|
The above example will output: |
Example 2. Counting rows returned by a SELECT statement
For most databases, PDOStatement::rowCount() does not
return the number of rows affected by a SELECT statement. Instead, use
PDO::query() to issue a SELECT COUNT(*) statement
with the same predicates as your intended SELECT statement, then use
PDOStatement::fetchColumn() to retrieve the number
of rows that will be returned. Your application can then perform the
correct action.
<?php
$sql = "SELECT COUNT(*) FROM fruit WHERE calories > 100";
if ($res = $conn->query($sql)) {
/* Check the number of rows that match the SELECT statement */
if ($res->fetchColumn() > 0) {
/* Issue the real SELECT statement and work with the results */
$sql = "SELECT name FROM fruit WHERE calories > 100";
foreach ($conn->query($sql) as $row) {
print "Name: " . $row['NAME'] . "\n";
}
}
/* No rows matched -- do something else */
else {
print "No rows matched the query.";
}
}
$res = null;
$conn = null;
?>
|
The above example will output: |
See Also
| PDOStatement::columnCount() |
| PDOStatement::fetchColumn() |
| PDOStatement::query() |