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mysql_data_seek

(PHP 3, PHP 4 )

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.

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_pconnect("localhost", "mysql_user", "mysql_password")
        or die("Could not connect: " . mysql_error());

    mysql_select_db("samp_db")
        or die("Could not select database: " . mysql_error());

    $query = "SELECT last_name, first_name FROM friends";
    $result = mysql_query($query)
        or 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(!($row = mysql_fetch_object($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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