连接扩展

  • 1. Mysqli扩展

//mysqli扩展
if(function_exists('mysqli_connect')){
    echo 'Mysqli扩展已经安装'."\n";
}
$link = mysqli_connect('localhost','root','123456','test','3306');
  • 2. pdo扩展

$dbh = new PDO('mysql:host=localhost;dbname=test','root','123456');

inset

<?php
$link = mysqli_connect('localhost','root','123456','test','3306');
$name = '笨猪';
$sql = "insert into user(name) values ('$name')";
echo $sql."\n";
mysqli_query($link,$sql);
$id = mysqli_insert_id($link);
echo $id;
mysqli_close($link);

select

可以通过设定参数MYSQL_NUM只获取数字索引数组,等同于mysql_fetch_row函数,如果设定参数为MYSQL_ASSOC则只获取关联索引数组,等同于mysql_fetch_assoc函数。

$row = mysql_fetch_row($result);
$row = mysql_fetch_array($result, MYSQL_NUM);

$row = mysql_fetch_assoc($result);
$row = mysql_fetch_array($result, MYSQL_ASSOC);

如果需要获得所有的结果 需要循环遍历

while ($row = mysqli_fetch_array($result,MYSQLI_ASSOC)){
    print_r($row)."\n";
}

update、delete

获取更新过的数据行数:

if(mysqli_query($link,$sql)){
    //输出更新的行数
    echo mysqli_affected_rows($link);
}

关闭数据库

mysqli_close($link);