PDOStatement->nextRowset()
It'd better to use SQL_CALC_FOUND_ROWS, if you only use MySQL. It has many advantages as you could retrieve only part of result set (via LIMIT) but still get the total row count.
code:
<?php
$db = new PDO(DSN...);
$db->setAttribute(array(PDO::MYSQL_USE_BUFFERED_QUERY=>TRUE));
$rs = $db->query('SELECT SQL_CALC_FOUND_ROWS * FROM table LIMIT 5,15');
$rs1 = $db->query('SELECT FOUND_ROWS()');
$rowCount = (int) $rs1->fetchColumn();
?>
PDOStatement->rowCount()
(PHP 5 >= 5.1.0, PECL pdo:0.1-1.0.3)
PDOStatement->rowCount() — Returns the number of rows affected by the last SQL statement
Description
PDOStatement
int 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.
Return Values
Returns the number of rows.
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:
Deleted 9 rows.
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:
apple banana orange pear
add a note
User Contributed NotesPDOStatement->rowCount()
gunnrosebutpeace at gmail dot com
03-Jun-2008 12:19
03-Jun-2008 12:19