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mysql_fetch_row

获取和显示数据

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每次调用指针自动指向下一个记录

<?php
mysql_connect('127.0.0.1','root','');
mysql_select_db('info');
mysql_query("set names 'utf8'");
$query=mysql_query('select * from test');
while($row=mysql_fetch_row($query)){
//Array ( [0] => 1 [1] => abc )返回查询资源的第一条数据
    echo $row[1].$row[2].'个<br/>';
}

$uid=mysql_insert_id(); 
echo $uid;//返回插入的id
?>

abc3个
苹果5个
香蕉7个
荔枝9个
0

mysql_fetch_row与mysql_fetch_array区别

mysql_fetch_row会产生索引数组
mysql_fetch_array默认产生索引数组和关联数组
mysql_fetch_row效率高（通过下标取值）

<?php
    mysql_connect('127.0.0.1','root','');
    mysql_selectdb('info');
    mysql_query('set names utf8');
    $query=mysql_query('select * from test');
    print_r(mysql_fetch_row($query));
    echo '<br/>';
    print_r(mysql_fetch_array($query));
?>

Array ( [0] => 1 [1] => abc [2] => 3 ) 
Array ( [0] => 2 [id] => 2 [1] => 苹果 [name] => 苹果 [2] => 5 [num] => 5 )

mysql_fetch_array

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<?php
    mysql_connect('127.0.0.1','root','');
    mysql_selectdb('info');
    mysql_query('set names utf8');
    $query=mysql_query('select * from test');
    while($row=mysql_fetch_array($query)){
        echo $row['name'].$row['num'].'个<br/>';
    }
?>

abc3个
苹果5个
香蕉7个
荔枝9个

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mysql_fetch_assoc

等同于mysql_fetch_array(‘资源标识符’,MYSQL_ASSOC)；

练习

假设现在想从表art里按时间date取最新一条记录的title字段的值并打印。$q = mysql_query(‘select title from art order by date desc limit 1’)，后续步骤正确的是？

$data = mysql_fetch_row($q);echo $data[0];

mysql_fetch_object

<?php
    mysql_connect('127.0.0.1','root','');
    mysql_selectdb('info');
    mysql_query('set names utf8');
    $query=mysql_query('select * from test');
    $arr=mysql_fetch_object($query);
    print_r($arr);
?>

stdClass Object ( [id] => 1 [name] => abc [num] => 3 [price] => 10 )

<?php
    mysql_connect('127.0.0.1','root','');
    mysql_selectdb('info');
    mysql_query('set names utf8');
    $query=mysql_query('select * from test');
    while($arr=mysql_fetch_object($query))
    {
        echo $arr->name.'<br/>';
    }
?>

abc
苹果
香蕉
荔枝