PHP uses the mysqli extension library to implement addition, deletion, modification and query (object-oriented version)

The mysqli extension library is an improved version of the mysql extension library. It improves stability and efficiency based on the mysql extension library. The mysqli extension library has two sets of things, one is process-oriented mysqli and the other is object-oriented mysqli. The operation method is generally the same as that of the mysql extension library. This time, we first extract a tool class for operating mysql and the calling class.

1.mysqli extension library operation database tool class

<?<span style="color: #000000;">php
 </span><span style="color: #008000;">//</span><span style="color: #008000;">数据库操作类</span>
  <span style="color: #0000ff;">class</span><span style="color: #000000;"> DBUtil{
   </span><span style="color: #0000ff;">private</span> <span style="color: #800080;">$host</span>="localhost"<span style="color: #000000;">;
   </span><span style="color: #0000ff;">private</span> <span style="color: #800080;">$username</span>="root"<span style="color: #000000;">;
   </span><span style="color: #0000ff;">private</span> <span style="color: #800080;">$password</span>="123456"<span style="color: #000000;">;
   </span><span style="color: #0000ff;">private</span> <span style="color: #800080;">$dbname</span>="student"<span style="color: #000000;">;
   </span><span style="color: #0000ff;">private</span> <span style="color: #800080;">$conn</span><span style="color: #000000;">;
   </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> DBUtil(){
     </span><span style="color: #800080;">$this</span>->conn=<span style="color: #0000ff;">new</span> mysqli(<span style="color: #800080;">$this</span>->host, <span style="color: #800080;">$this</span>->username, <span style="color: #800080;">$this</span>->password,<span style="color: #800080;">$this</span>->dbname) or <span style="color: #0000ff;">die</span>(<span style="color: #800080;">$this</span>->conn-><span style="color: #000000;">connect_error);
    
   }
  </span><span style="color: #008000;">//</span><span style="color: #008000;">查询</span>
   <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> query(<span style="color: #800080;">$sql</span><span style="color: #000000;">){
     </span><span style="color: #800080;">$all</span>= <span style="color: #800080;">$this</span>->conn->query(<span style="color: #800080;">$sql</span><span style="color: #000000;">);
     </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$all</span><span style="color: #000000;">;
   }
  </span><span style="color: #008000;">//</span><span style="color: #008000;">插入,修改，删除</span>
   <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> otherOperate(<span style="color: #800080;">$sql</span><span style="color: #000000;">){
      </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$this</span>->conn->query(<span style="color: #800080;">$sql</span><span style="color: #000000;">)){
        </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$this</span>->conn->affected_rows>0<span style="color: #000000;">){
           </span><span style="color: #0000ff;">return</span> "OK"<span style="color: #000000;">;
        }</span><span style="color: #0000ff;">else</span><span style="color: #000000;">{
           </span><span style="color: #0000ff;">return</span> "ERROOR"<span style="color: #000000;">;
        }
      }
   }
   </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> close(){
     </span><span style="color: #800080;">$this</span>->conn-><span style="color: #000000;">close();
   }
  }
</span>?>

2. The following is the specific code for calling the tool class

<?<span style="color: #000000;">php
  </span><span style="color: #0000ff;">require_once</span> "MySQLUtil.php"<span style="color: #000000;">;
   </span><span style="color: #008000;">/*</span><span style="color: #008000;">$sql="select * from m_student";
   $util=new DBUtil();
   $result=$util->query($sql);
   while($row=$result->fetch_assoc()){
        echo "$row[stuName]"."</br>";
   }
   $result->free();
   $util->close();<span style="color: #008000;">*/</span>
   <span style="color: #800080;">$sql</span>="update m_student set stuName='杨幂' where id=3"<span style="color: #000000;">;
   </span><span style="color: #800080;">$util</span>=<span style="color: #0000ff;">new</span><span style="color: #000000;"> DBUtil();
   </span><span style="color: #800080;">$result</span>=<span style="color: #800080;">$util</span>->otherOperate(<span style="color: #800080;">$sql</span><span style="color: #000000;">);
   </span><span style="color: #0000ff;">echo</span> <span style="color: #800080;">$result</span><span style="color: #000000;">;
   </span><span style="color: #800080;">$util</span>-><span style="color: #000000;">close();
</span>?>

Reference reading: www.manongjc.com/article/1206.html