MySQLi_Result
在线手册：中文 英文
PHP手册

mysqli_result::data_seek

mysqli_data_seek

(PHP 5)

mysqli_result::data_seek -- mysqli_data_seek — Adjusts the result pointer to an arbitary row in the result

说明

面向对象风格

bool mysqli_result::data_seek ( int $offset )

过程化风格

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.

参数

result

仅以过程化样式：由 mysqli_query()，mysqli_store_result() 或 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($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);
?>

以上例程会输出：

City: Benin City  Countrycode: NGA

参见

MySQLi_Result
在线手册：中文 英文
PHP手册
PHP手册 - N: Adjusts the result pointer to an arbitary row in the result

用户评论:

kaisellgren at gmail dot com (09-Sep-2008 08:07)

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.
 }

?>