php+mysqli uses object-oriented method to query database instances, mysqli object-oriented_PHP tutorial

php+mysqli uses object-oriented method to query database instances, mysqli is object-oriented

The example in this article describes how php+mysqli uses an object-oriented approach to query the database. Share it with everyone for your reference. The specific implementation method is as follows:

<&#63;php
//第一步：创建数据连接对象
$mysqli = new MySQLi("localhost","root","123456");
//默认的 MySQL的类，其属性与方法见手册
if($mysqli->connect_error){//connect_error为属性，报错
 die("数据库连接失败：".$mysqli->connect_errno."--".$mysqli->connect_error);
// connect_errno:错误编号
}
$mysqli->select_db("liuyan");//选择数据库
$mysqli->query("set names 'GBK'");

//第二步：数据库查询，代码如下
$sql = "select title,contents from news limit 5,5";
//第三步：执行，显示结果
$res = $mysqli->query($sql) or die($mysqli->error);
// 返回值 $res 为资源类型（获取到结果的资源类型）
if($res){
 while($row = $res->fetch_assoc()){
//注意：fetch_assoc()为 MySQLi_Result 里的函数，详情见手册
 echo "标题：".$row['title']."<br>内容：".$row['contents']."<hr>";
 }
}
//第四步，释放结果集，关闭连接
$res->free();
$mysqli->close();
&#63;>

I hope this article will be helpful to everyone’s PHP programming design.

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