7.3.10.3 mysqli_result::data_seek, mysqli_data_seek

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• mysqli_result::data_seek

  mysqli_data_seek

  Adjusts the result pointer to an arbitrary row in the result

Description

Object-oriented style

public bool mysqli_result::data_seek(int offset);

Procedural style

bool mysqli_data_seek(mysqli_result result,
                      int offset);

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 field 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 7.113 mysqli::data_seek example

Object-oriented style

<?php
mysqli_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

<?php
mysqli_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 7.114 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.

<?php
mysqli_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

mysqli_store_result

mysqli_fetch_row

mysqli_fetch_array

mysqli_fetch_assoc

mysqli_fetch_object

mysqli_query

mysqli_num_rows