SunshinePHP Developer Conference 2015

mysqli_result::data_seek

mysqli_data_seek

(PHP 5)

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

Descrierea

Stil obiect-orientat

bool mysqli_result::data_seek ( int $offset )

Stil procedural

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.

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($result399);

    
/* 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

Vedeți de asemenea

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User Contributed Notes 1 note

up
6
kaisellgren at gmail dot com
6 years ago
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.
}

?>
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