欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  后端开发

PHP数据库处理封装类

程序员文章站 2022-03-30 18:13:23
...
这篇文章主要介绍了PHP数据库处理封装类,结合完整实例形式分析了php基于mysqli封装的数据库连接及增删改查等操作,需要的朋友可以参考下

具体如下:

MySQL的操作相关类,检查并使用了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.
  $mydb->selectdb ("wps");
  //Now, let's perform an action.
  //$adata = $mydb->execute ("UPDATE cd SET title='Hybrid Theory' WHERE cdid='2'");
  //Then, let'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;
?>

以上就是本文的全部内容,希望对大家的学习有所帮助。


相关推荐:

php基于PDO实现功能强大的MYSQL封装类实例详解

php实现的XML操作(封装类完整实例解析

PHP实现的DES加密解密封装类完整的方法

以上就是PHP数据库处理封装类的详细内容,更多请关注其它相关文章!