PHP : Function Reference : PDO Functions : PDOStatement->rowCount() PHP Examples Tutorials References

Example 1792. 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:

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Deleted 9 rows.

Example 1793. 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.

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<?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:

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apple

banana

orange

pear

Code Examples / Notes » pdostatement_rowcount

If PDOStatement->rowCount() does not return the number of rows affected by a SELECT statement i use a smaller way to get the number of rows. <?php $sql = 'SELECT name FROM fruit WHERE calories > 100'; $fruits = $db->query($sql); if( count($fruits) > 0 ){ foreach ($fruits as $fruit) { echo 'Name: ' . $fruit['name'] . "\n"; } }else{ echo 'No fruits ...'; } ?> i don't know if that is a correct way, but it works

hipska at mac dot com : what you say is not correct. The resulting $fruits cannot be used as an array, and count($fruits) always equals 1. The confusion is however understandable, since foreach ($fruits->query($query) as $row){} will work, as with any array. The most efficient way to retrieve number of rows found by SELECT in a portable application is probably to make a condition : - Check that the current database system (get its name via getAttribute()), is one where rowCount() returns the number of rows found 1) If it does, there you have it 2) If it does not, execute an extra COUNT query.

Great, while using MySQL5, the only way to get the number of rows after doing a PDO SELECT query is to either execute a separate SELECT COUNT(*) query (or to do count($stmt->fetchAll()), which seems like a ridiculous waste of overhead and programming time. Another gripe I have about PDO is its inability to get the value of output parameters from stored procedures in some DBMSs, such as SQL Server. I'm not so sure I'm diggin' PDO yet.

PDOStatement->rowCount()

Returns the number of rows affected by the last SQL statement ()

Example 1792. Return the number of deleted rows

Example 1793. Counting rows returned by a SELECT statement

Code Examples / Notes » pdostatement_rowcount

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