mysql_data_seek

(PHP 3, PHP 4 , PHP 5)

mysql_data_seek -- Move internal result pointer

Description

bool mysql_data_seek ( resource result_identifier, int row_number)

Returns TRUE on success or FALSE on failure.

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 mysql_fetch_row() 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.

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

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);
?>

See also mysql_query() and mysql_num_rows().


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