mysql_field_seek

(PHP 4, PHP 5)

mysql_field_seek — 将结果集中的指针设定为制定的字段偏移量

说明

mysql_field_seek(resource $result, int $field_offset): int

用指定的字段偏移量检索。如果下一个 mysql_fetch_field() 的调用不包括字段偏移量，则会返回本次 mysql_field_seek() 中指定的偏移量的字段。

参见 mysql_fetch_field()。

add a note

User Contributed Notes 4 notes

down

adrien dot gibrat at gmail dot com ¶

13 years ago


Not dumb at all!!

It means that "mysql_field_seek" and "mysql_data_seek" are moving the same cursor... through the rows and columns of the result resource.

Also means that the cursor goes to a new row when it reach a final field(aka column), by exemple while looping with "mysql_fetch_field".

Calling "mysql_fetch_object", "mysql_fetch_array", "mysql_fetch_assoc"
and "mysql_fetch_row" seems to place the cursor at the end of the line.

So calling "mysql_fetch_field" without a field index, just after that, will return false.

down

-1

chris at igwsolutions dot com ¶

14 years ago


I spent a good deal of time trying to get the example to work, but the example does not work. 
To do what the exaple is trying to do, you would need to use mysql_data_seek

assume we have table named testing which contains
id      name
1       Hassan
2       Jack
3       Rose
---------------

Here is an expample that will do the above example. 

Since I am more comfortable in a OOP setting, I used mysql_fetch_object

<?php
    require("myConnenctionFile.php");
    
    $sql="SELECT  * from testing";
    $result=mysql_query($sql);

    $row = mysql_fetch_object($result);
    echo $row->id . ' ' . $row->name; // Output is (1      Hassan)
    mysql_data_seek($result,2);
    $row = mysql_fetch_object($result);
    echo $row->id . ' ' . $row->name; // Output is (3      Rose)
    echo "<BR><BR>";
?>

down

-1

poulpillusion at free dot fr ¶

15 years ago


A dumb comment... but it may save people some time : 
mysql_field_seek != mysql_data_seek

In order to fetch again the results of a resource result from the beginning, you will use mysql_data_seek(id, 0)

down

-4

Hassan Kazem ¶

14 years ago


an example of this function
assume we have table1 which contains
ID      Name
1       Hassan
2       Jack
3       Rose
---------------
<?php 
mysql_connect("sql.server.com", "username", "password") or die(mysql_error()); 
mysql_select_db("database") or die(mysql_error()); 
$sql="SELECT  * from table1";
$result=mysql_query($sql);
$row = mysql_fetch_array($result);
echo $row['ID'] . ' ' . $row['Name']; // Output is (1      Hassan)
mysql_field_seek($result,2);
echo $row['ID'] . ' ' . $row['Name']; // Output is (3      Rose)
?>
---------------
// You can see that the seek command forwarded the pointer one step and skipped row number 2

add a note

官方地址：https://www.php.net/manual/en/function.mysql-field-seek.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库面试 C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 adodb手册 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 opcache预加载 Composer的Packagist资源 mysql面试题 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式 PHP7添加redis扩展 PHP mkdir()写出来的权限与mode值不符合 Packagist / Composer 中国全量镜像常用的php ADODB使用方法集锦 [原创]诡异的php-fpm超时问题 php中几种注释规范

略微加速

PHP官方手册 - 互联网笔记

mysql_field_seek

说明

User Contributed Notes 4 notes