PHP数据库处理封装类实例

php  /  管理员 发布于 7年前   268

本文实例讲述了PHP数据库处理封装类。分享给大家供大家参考，具体如下：

MySQL的操作相关类，检查并使用了mysqli

 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)){$exceptionstring = "Error connection to database: 
";$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: 
";$exceptionstring .= mysql_errno() . ": " . mysql_error();throw new exception ($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: $thedb: 
";$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: $thedb: 
";$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: $thequery: 
";$exceptionstring .= $this->db->errno . ": " . $this->db->error;throw new exception ($exceptionstring);          } else {echo "Query performed correctly: " . $this->db->affected_rows . " row(s) affected.
";          }        //Mysql functionality.        } else {          if (!mysql_query ($thequery, $this->db)){$exceptionstring = "Error performing query: $thequery: 
";$exceptionstring .= mysql_errno() . ": " . mysql_error();throw new exception ($exceptionstring);          } else {echo "Query performed correctly: " . mysql_affected_rows () . " row(s) affected.
";          }        }      } 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: $thequery: 
";$exceptionstring .= $this->db->errno . ": " . $this->db->error;throw new exception ($exceptionstring);          }        //Mysql functionality.        } else {          if (!$aquery = mysql_query ($thequery)){$exceptionstring = "Error performing query: $thequery: 
";$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: 
";$exceptionstring .= $this->db->errno . ": " . $this->db->error;throw new exception ($exceptionstring);          }        //Mysql functionality.        } else {          if (!mysql_close ($this->db)){$exceptionstring = "Error closing connection: 
";$exceptionstring .= mysql_errno() . ": " . mysql_error();throw new exception ($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] . "
";  }  $mydb->selectdb("test");  $result = $mydb->execute("UPDATE user SET age = 23 WHERE id = 2");  echo "
";  echo $result;?>

更多关于PHP相关内容感兴趣的读者可查看本站专题：《php+mysql数据库操作入门教程》、《PHP基于pdo操作数据库技巧总结》、《PHP+MongoDB数据库操作技巧大全》、《php+Oracle数据库程序设计技巧总结》、《php+mssql数据库程序设计技巧总结》、《php+redis数据库程序设计技巧总结》、《php+mysqli数据库程序设计技巧总结》及《php常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所帮助。

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