Yaf框架封装的MySQL数据库操作示例

本文实例讲述了Yaf框架封装的MySQL数据库操作。分享给大家供大家参考，具体如下：

Yaf封装DB简单操作

介绍

因为Yaf是一个纯天然的MVC阔架，本人还在贝锐的时候就和主管一起用Yaf框架去重构了向日葵的网站端，到后面，Yaf也逐渐应用到了其他项目上，但是Yaf是没有带DB类库的，所以本人也共享下最近封装的代码！

代码

使用PDO封装MySQL操作

class Db_Mysql
{
  private $_options = array();
  private $db;
  private $statement;
  private $_fetchMode = 2;
  
  private function __construct($host, $username, $password, $dbname, $charset)
  {
    //初始化数据连接
    try {
      $dns = 'mysql:dbname=' . $dbname . ';host=' . $host;
      $this->db = new PDO($dns, $username, $password, array(PDO::ATTR_PERSISTENT => true, PDO::ATTR_AUTOCOMMIT => 1));
      $this->db->query('SET NAMES ' . $charset);
    } catch (PDOException $e) {
      echo header("Content-type: text/html; charset=utf-8");
      echo '
';
      echo 'Connection failed:' . $e->getMessage();
      die;
    }
  }
  
  static public function getInstance($config = '')
  {
    $host = $config->host;
    $username = $config->username;
    $password = $config->password;
    $dbname = $config->dbname;
    $charset = $config->charset;
    $db = new self($host, $username, $password, $dbname, $charset);
    return $db;
  }
  
  public function fetchAll($sql, $bind = array(), $fetchMode = null)
  {
    if($fetchMode === NULL){
      $fetchMode = $this->_fetchMode;
    }
    $stmt = $this->query($sql, $bind);
    $res = $stmt->fetchAll($fetchMode);
    return $res;
  }
  
  public function fetchRow($sql, array $bind = array(), $fetchMode = null)
  {
    if ($fetchMode === null) {
      $fetchMode = $this->_fetchMode;
    }
    $stmt = $this->query($sql, $bind);
    $result = $stmt->fetch($fetchMode);
    return $result;
  }
  
  public function fetchOne($sql, array $bind = array())
  {
    $stmt = $this->query($sql, $bind);
    $res = $stmt->fetchColumn(0);
    return $res;
  }
  
  public function insert($table, array $bind)
  {
    $cols = array();
    $vals = array();
    foreach ($bind as $k => $v) {
      $cols[] = '`' . $k . '`';
      $vals[] = ':' . $k;
      unset($bind[$k]);
      $bind[':' . $k] = $v;
    }
    $sql = 'INSERT INTO '
      . $table
      . ' (' . implode(',', $cols) . ') '
      . 'VALUES (' . implode(',', $vals) . ')';
    $stmt = $this->query($sql, $bind);
    $res = $stmt->rowCount();
    return $res;
  }
  
  public function delete($table, $where = '')
  {
    $where = $this->_whereExpr($where);
    $sql = 'DELETE FROM '
      . $table
      . ($where ? ' WHERe ' .$where : '');
    $stmt = $this->query($sql);
    $res = $stmt->rowCount();
    return $res;
  }
  
  public function update($table, array $bind, $where = '')
  {
    $set = array();
    foreach ($bind as $k => $v) {
      $bind[':' . $k] = $v;
      $v = ':' . $k;
      $set[] = $k . ' = ' . $v;
      unset($bind[$k]);
    }
    $where = $this->_whereExpr($where);
    $sql = 'UPDATE '
      . $table
      . ' SET ' . implode(',', $set)
      . (($where) ? ' WHERe ' . $where : '');
    $stmt = $this->query($sql, $bind);
    $res = $stmt->rowCount();
    return $res;
  }
  
  public function lastInsertId()
  {
    return (string) $this->db->lastInsertId();
  }
  public function query($sql, $bind = array())
  {
    if(!is_array($bind)){
      $bind = array($bind);
    }
    $stmt = $this->prepare($sql);
    $stmt->execute($bind);
    $stmt->setFetchMode($this->_fetchMode);
    return $stmt;
  }
  public function prepare($sql = '')
  {
    if(empty($sql)){
      return false;
    }
    $this->statement = $this->db->prepare($sql);
    return $this->statement;
  }
  public function execute($param = '')
  {
    if(is_array($param)){
      try {
 return $this->statement->execute($param);
      } catch (Exception $e) {
 return $e->getMessage();
      }
    }else {
      try {
 return $this->statement->execute();
      } catch (Exception $e) {
 return $e->getMessage();
      }
    }
  }
  
  protected function _whereExpr($where)
  {
    if(empty($where)){
      return $where;
    }
    if(!is_array($where)){
      $where = array($where);
    }
    $where = implode(' AND ', $where);
    return $where;
  }
  
  public function close()
  {
    $this->_db = null;
  }
}



配置

db.type = 'mysql'
db.host = '127.0.0.1'
db.username = 'root'
db.password = '123456'
db.dbname = 'test'
db.charset = 'UTF8'



调用方法

class TestController extends Yaf_Controller_Abstract
{
  public function indexAction()
  {
    $config = Yaf_Application::app()->getConfig()->db;
    $db = Db_Mysql::getInstance($config);
    $row = $db->fetchOne('select count(*) from `user`');
    print_r($row);die;
  }
}



结果

更多关于php框架相关内容感兴趣的读者可查看本站专题：《php优秀开发框架总结》、《codeigniter入门教程》、《ThinkPHP入门教程》、《Zend frameWork框架入门教程》、《php面向对象程序设计入门教程》、《php+mysql数据库操作入门教程》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。