PHP database processing encapsulation class

This article mainly introduces the PHP database processing encapsulation class, and analyzes PHP's database connection, addition, deletion, modification and other operations based on mysqli encapsulation in the form of a complete example. Friends in need can refer to the following

. The details are as follows:

MySQL operation related classes, check and use mysqli

<?php
  //sample15_12.php
  class mydb {
    private $user;
    private $pass;
    private $host;
    private $db;
    //Constructor function.
    public function __construct (){
      $num_args = func_num_args();
      if($num_args > 0){
        $args = func_get_args();
        $this->host = $args[0];
        $this->user = $args[1];
        $this->pass = $args[2];
        $this->connect();
      }
    }
    //Function to tell us if mysqli is installed.
    private function mysqliinstalled (){
      if (function_exists ("mysqli_connect")){
        return true;
      } else {
        return false;
      }
    }
    //Function to connect to the database.
    private function connect (){
      try {
        //Mysqli functionality.
        if ($this->mysqliinstalled()){
          if (!$this->db = new mysqli ($this->host,$this->user,$this->pass)){
            $exceptionstring = "Error connection to database: <br />";
            $exceptionstring .= mysqli_connect_errno() . ": " . mysqli_connect_error();
            throw new exception ($exceptionstring);
          }
        //Mysql functionality.
        } else {
          if (!$this->db = mysql_connect ($this->host,$this->user,$this->pass)){
            $exceptionstring = "Error connection to database: <br />";
            $exceptionstring .= mysql_errno() . ": " . mysql_error();
            throw new exception ($exceptionstring);
          }
        }
      } catch (exception $e) {
        echo $e->getmessage();
      }
    }
    //Function to select a database.
    public function selectdb ($thedb){
      try {
        //Mysqli functionality.
        if ($this->mysqliinstalled()){
          if (!$this->db->select_db ($thedb)){
            $exceptionstring = "Error opening database: $thedb: <br />";
            $exceptionstring .= $this->db->errno . ": " . $this->db->error;
            throw new exception ($exceptionstring);
          }
        //Mysql functionality.
        } else {
          if (!mysql_select_db ($thedb, $this->db)){
            $exceptionstring = "Error opening database: $thedb: <br />";
            $exceptionstring .= mysql_errno() . ": " . mysql_error();
            throw new exception ($exceptionstring);
          }
        }
      } catch (exception $e) {
        echo $e->getmessage();
      }
    }
    //Function to perform a query.
    public function execute ($thequery){
      try {
        //Mysqli functionality.
        if ($this->mysqliinstalled()){
          if (!$this->db->query ($thequery)){
            $exceptionstring = "Error performing query: $thequery: <br />";
            $exceptionstring .= $this->db->errno . ": " . $this->db->error;
            throw new exception ($exceptionstring);
          } else {
            echo "Query performed correctly: " . $this->db->affected_rows . " row(s) affected.<br />";
          }
        //Mysql functionality.
        } else {
          if (!mysql_query ($thequery, $this->db)){
            $exceptionstring = "Error performing query: $thequery: <br />";
            $exceptionstring .= mysql_errno() . ": " . mysql_error();
            throw new exception ($exceptionstring);
          } else {
            echo "Query performed correctly: " . mysql_affected_rows () . " row(s) affected.<br />";
          }
        }
      } catch (exception $e) {
        echo $e->getmessage();
      }
    }
    //Function to return a row set.
    public function getrows ($thequery){
      try {
        //Mysqli functionality.
        if ($this->mysqliinstalled()){
          if ($result = $this->db->query ($thequery)){
            $returnarr = array ();
            while ($adata = $result->fetch_array ()){
              $returnarr = array_merge ($returnarr,$adata);
            }
            return $returnarr;
          } else {
            $exceptionstring = "Error performing query: $thequery: <br />";
            $exceptionstring .= $this->db->errno . ": " . $this->db->error;
            throw new exception ($exceptionstring);
          }
        //Mysql functionality.
        } else {
          if (!$aquery = mysql_query ($thequery)){
            $exceptionstring = "Error performing query: $thequery: <br />";
            $exceptionstring .= mysql_errno() . ": " . mysql_error();
            throw new exception ($exceptionstring);
          } else {
            $returnarr = array ();
            while ($adata = mysql_fetch_array ($aquery)){
              $returnarr = array_merge ($returnarr,$adata);
            }
            return $returnarr;
          }
        }
      } catch (exception $e) {
        echo $e->getmessage();
      }
    }
    //Function to close the database link.
    public function __destruct() {
      try {
        //Mysqli functionality.
        if ($this->mysqliinstalled()){
          if (!$this->db->close()){
            $exceptionstring = "Error closing connection: <br />";
            $exceptionstring .= $this->db->errno . ": " . $this->db->error;
            throw new exception ($exceptionstring);
          }
        //Mysql functionality.
        } else {
          if (!mysql_close ($this->db)){
            $exceptionstring = "Error closing connection: <br />";
            $exceptionstring .= mysql_errno() . ": " . mysql_error();
            throw new exception ($exceptionstring);
          }
        }
      } catch (exception $e) {
        echo $e->getmessage();
      }
    }
  }
  //Now, let us create an instance of mydb.
  $mydb = new mydb ("localhost","root","");
  //Select a database to use.
  $mydb->selectdb ("wps");
  //Now, let&#39;s perform an action.
  //$adata = $mydb->execute ("UPDATE cd SET title=&#39;Hybrid Theory&#39; WHERE cdid=&#39;2&#39;");
  //Then, let&#39;s try to return a row set.
  $adata = $mydb->getrows ("SELECT * FROM wp_terms");
  for ($i = 0; $i < count ($adata); $i++){
    echo $adata[$i] . "<br />";
  }
  $mydb->selectdb("test");
  $result = $mydb->execute("UPDATE user SET age = 23 WHERE id = 2");
  echo "<br />";
  echo $result;
?>

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