PHP: Move internal result pointer

Description

bool mysql_data_seek ( resource $result , int $row_number )

mysql_data_seek() moves the internal row pointer of the MySQL result associated with the specified result identifier to point to the specified row number. The next call to a MySQL fetch function, such as mysql_fetch_assoc(), would return that row.

row_number starts at 0. The row_number should be a value in the range from 0 to mysql_num_rows() - 1. However if the result set is empty (mysql_num_rows() == 0), a seek to 0 will fail with a E_WARNING and mysql_data_seek() will return FALSE.

Parameters

result: The result resource that is being evaluated. This result comes from a call to mysql_query().
row_number: The desired row number of the new result pointer.

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example #1 mysql_data_seek() example


<?php

$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');

if (!$link) {

    die('Could not connect: ' . mysql_error());

}

$db_selected = mysql_select_db('sample_db');

if (!$db_selected) {

    die('Could not select database: ' . mysql_error());

}

$query = 'SELECT last_name, first_name FROM friends';

$result = mysql_query($query);

if (!$result) {

    die('Query failed: ' . mysql_error());

}

/* fetch rows in reverse order */

for ($i = mysql_num_rows($result) - 1; $i >= 0; $i--) {

    if (!mysql_data_seek($result, $i)) {

        echo "Cannot seek to row $i: " . mysql_error() . "\n";

        continue;

    }



    if (!($row = mysql_fetch_assoc($result))) {

        continue;

    }



    echo $row['last_name'] . ' ' . $row['first_name'] . "<br />\n";

}



mysql_free_result($result);

?>

Notes

Note: The function mysql_data_seek() can be used in conjunction only with mysql_query(), not with mysql_unbuffered_query().

mysql_data_seek

Description

Parameters

Return Values

Examples

Notes

See Also