mysqli_result::data_seek

mysqli_data_seek

(PHP 5, PHP 7)

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

说明

面向对象风格

mysqli_result::data_seek ( int $offset ) : bool

过程化风格

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.

参数

result

仅以过程化样式:由 mysqli_query()mysqli_store_result()mysqli_use_result()返回的结果集标识。

offset

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

返回值

成功时返回 TRUE, 或者在失败时返回 FALSE

注释

Note:

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

范例

Example #1 面向对象风格

<?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 过程化风格

<?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);
?>

以上例程会输出:

City: Benin City  Countrycode: NGA

参见

User Contributed Notes

kaisellgren at gmail dot com 09-Sep-2008 12:07
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.
 
}

?>