This is useful function when you try to loop through the resultset numerous times.
For example:
<?php
$result = mysqli_query($connection_id,$query);
while ($row = mysqli_fetch_assoc($result))
{
// Looping through the resultset.
}
// Now if you need to loop through it again, you would first call the seek function:
mysqli_data_seek($result,0);
while ($row = mysqli_fetch_assoc($result))
{
// Looping through the resultset again.
}
?>
mysqli_result::data_seek
mysqli_data_seek
(PHP 5, PHP 7)
mysqli_result::data_seek -- mysqli_data_seek — Adjusts the result pointer to an arbitrary row in the result
Descrierea
Stil obiect-orientat
public mysqli_result::data_seek
( int
$offset
) : boolStil procedural
The mysqli_data_seek() function seeks to an arbitrary
result pointer specified by the offset in the
result set.
Parametri
-
result -
Numai stilul procedural: Un identificator al setului de rezultate întors de mysqli_query(), mysqli_store_result() sau mysqli_use_result ().
-
offset -
The field offset. Must be between zero and the total number of rows minus one (0..mysqli_num_rows() - 1).
Valorile întoarse
Întoarce valoarea true în cazul
succesului sau false în cazul eșecului.
Note
Notă:
This function can only be used with buffered results attained from the use of the mysqli_store_result() or mysqli_query() functions.
Exemple
Example #1 Stil obiect-orientat
<?php
/* Open a connection */
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$query = "SELECT Name, CountryCode FROM City ORDER BY Name";
if ($result = $mysqli->query($query)) {
/* seek to row no. 400 */
$result->data_seek(399);
/* fetch row */
$row = $result->fetch_row();
printf ("City: %s Countrycode: %s\n", $row[0], $row[1]);
/* free result set*/
$result->close();
}
/* close connection */
$mysqli->close();
?>
Example #2 Stil procedural
<?php
/* Open a connection */
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (!$link) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$query = "SELECT Name, CountryCode FROM City ORDER BY Name";
if ($result = mysqli_query($link, $query)) {
/* seek to row no. 400 */
mysqli_data_seek($result, 399);
/* fetch row */
$row = mysqli_fetch_row($result);
printf ("City: %s Countrycode: %s\n", $row[0], $row[1]);
/* free result set*/
mysqli_free_result($result);
}
/* close connection */
mysqli_close($link);
?>
Exemplele de mai sus vor afișa:
City: Benin City Countrycode: NGA
A se vedea și
- mysqli_store_result() - Transfers a result set from the last query
- mysqli_fetch_row() - Get a result row as an enumerated array
- mysqli_fetch_array() - Fetch a result row as an associative, a numeric array, or both
- mysqli_fetch_assoc() - Fetch a result row as an associative array
- mysqli_fetch_object() - Returns the current row of a result set as an object
- mysqli_query() - Performs a query on the database
- mysqli_num_rows() - Gets the number of rows in a result
add a note
User Contributed Notes 1 note
kaisellgren at gmail dot com ¶
16 years ago
