This article mainly introduces the steps of connecting PHP to mysql database. It has a very good reference value. Let’s take a look at it with the editor.
Connect to the database:
Use Object-oriented method;
1. Create a mysqli object and a connection object
2. Prepare a SQL statement
3. Execute the SQL statement, if it is a query statement. Successfully return results and objects
4. Find data from the result set object;
Query attributes Code:
<?php //造一个mysqli对象,造连接对象 $db=new MySQLi("localhost","root","12345678","heiheihei"); //括号里面填的是IP地址域名,用户名,密码,数据库的名字 //准备一条SQL语句 $sql = "select * from student"; //执行SQL语句,如果是查询语句。成功返回结果及对象 $reslut = $db->query($sql); //判断返回是否有内容,执行成功 if($reslut) { //如果成功了,从结果集对象里找到数据; $attr = $reslut->fetch_all(); //返回索引数组:$attr = $reslut->fetch_row() //返回关联数组:tch_assoc(); //返回对象:$attr = $reslut->fetch_object(); //返回既有索引又有关联:$arrt = $reslut->fetch_array(); var_dump($attr); ?>
The final return value is a set object. In order to see the results clearly, we use fetch_all(), fetch_row() ; fetch_object();
Add, delete and modify statements:
Add a piece of information:
//造连接对象 $db = new MySQLi("localhost","root","12345678","heiheihei"); //准备SQL语句 $sql = "insert into cou values('3-111','嘿嘿','803')"; //执行SQL语句 $r = $db ->query($sql); if($r)//如果$r是ture { echo "执行成功"; } else { echo "执行失败"; }
Change a message:
<?php //造连接对象 $db = new MySQLi("localhost","root","12345678","heiheihei"); //准备SQL语句 $sql = "update cou set cname='哈哈' where tno='803'"; //执行SQL语句 $r = $db ->query($sql); if($r) { echo "执行成功"; } else { echo "执行失败"; } ?>
Delete:
<?php //造连接对象 $db = new MySQLi("localhost","root","12345678","heiheihei"); //准备SQL语句 $sql = "delete from cou where tno='803'"; //执行SQL语句 $r = $db ->query($sql); if($r) { echo "执行成功"; } else { echo "执行失败"; } ?>
The above is the entire content of this article, I hope it will be helpful to everyone's study.
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