mysqli_result::data_seek

mysqli_data_seek

(PHP 5, PHP 7, PHP 8)

mysqli_result::data_seek -- mysqli_data_seekAdjusts the result pointer to an arbitrary row in the result

Description

Object-oriented style

public mysqli_result::data_seek(int $offset): bool

Procedural style

mysqli_data_seek(mysqli_result $result, int $offset): bool

The mysqli_data_seek() function seeks to an arbitrary result pointer specified by the offset in the result set.

Parameters

result

Procedural style only: A mysqli_result object returned by mysqli_query(), mysqli_store_result(), mysqli_use_result() or mysqli_stmt_get_result().

offset

The row offset. Must be between zero and the total number of rows minus one (0..mysqli_num_rows() - 1).

Return Values

Returns true on success or false on failure.

Examples

Example #1 mysqli::data_seek() example

Object-oriented style

<?phpmysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);$mysqli = new mysqli("localhost", "my_user", "my_password", "world");$query = "SELECT Name, CountryCode FROM City ORDER BY Name";$result = $mysqli->query($query);/* Seek to row no. 401 */$result->data_seek(400);/* Fetch single row */$row = $result->fetch_row();printf("City: %s  Countrycode: %s\n", $row[0], $row[1]);

Procedural style

<?phpmysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);$link = mysqli_connect("localhost", "my_user", "my_password", "world");$query = "SELECT Name, CountryCode FROM City ORDER BY Name";$result = mysqli_query($link, $query);/* Seek to row no. 401 */mysqli_data_seek($result, 400);/* Fetch single row */$row = mysqli_fetch_row($result);printf ("City: %s  Countrycode: %s\n", $row[0], $row[1]);

The above examples will output:

City: Benin City  Countrycode: NGA

Example #2 Adjusting the result pointer when iterating

This function can be useful when iterating over the result set to impose a custom order or rewind the result set when iterating multiple times.

<?phpmysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);$mysqli = new mysqli("localhost", "my_user", "my_password", "world");$query = "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 15,4";$result = $mysqli->query($query);/* Iterate the result set in reverse order */for ($row_no = $result->num_rows - 1; $row_no >= 0; $row_no--) {    $result->data_seek($row_no);    /* Fetch single row */    $row = $result->fetch_row();    printf("City: %s  Countrycode: %s\n", $row[0], $row[1]);}/* Reset pointer to the beginning of the result set */$result->data_seek(0);print "\n";/* Iterate the same result set again */while ($row = $result->fetch_row()) {    printf("City: %s  Countrycode: %s\n", $row[0], $row[1]);}

The above examples will output:

City: Acmbaro  Countrycode: MEX
City: Abuja  Countrycode: NGA
City: Abu Dhabi  Countrycode: ARE
City: Abottabad  Countrycode: PAK

City: Abottabad  Countrycode: PAK
City: Abu Dhabi  Countrycode: ARE
City: Abuja  Countrycode: NGA
City: Acmbaro  Countrycode: MEX

Notes

Note:

This function can only be used with buffered results attained from the use of the mysqli_store_result(), mysqli_query() or mysqli_stmt_get_result() functions.

See Also