`mysql_data_seek`

mysql_data_seek
Move internal result pointer

Description

bool mysql_data_seek(resource result,


int row_number);

mysql_data_seek moves the internal row pointer of the MariaDB result associated with the specified result identifier to point to the specified row number. The next call to a MariaDB 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 20.24. 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.