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; /** * 构造函数 * * @param string $host * @param string $username * @param string $password * @param string $dbname * @param string $charset */ private function __construct($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 "<pre />"; echo "<b>Connection failed:</b>" . $e->getMessage(); die; } } /** * 调用初始化MYSQL连接 * * @param string $config * @return Aomp_Db_Mysql */ static public function getInstance($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; } /** * 获取多条数据 * * @param string $sql * @param array $bind * @param string $fetchMode * @return multitype: */ public function fetchAll($sql, $bind = array(), $fetchMode = null) { if($fetchMode === NULL){ $fetchMode = $this->_fetchMode; } $stmt = $this->query($sql, $bind); $res = $stmt->fetchAll($fetchMode); return $res; } /** * 获取单条数据 * * @param string $sql * @param array $bind * @param string $fetchMode * @return mixed */ public function fetchRow($sql, array $bind = array(), $fetchMode = null) { if ($fetchMode === null) { $fetchMode = $this->_fetchMode; } $stmt = $this->query($sql, $bind); $result = $stmt->fetch($fetchMode); return $result; } /** * 获取统计或者ID * * @param string $sql * @param array $bind * @return string */ public function fetchOne($sql, array $bind = array()) { $stmt = $this->query($sql, $bind); $res = $stmt->fetchColumn(0); return $res; } /** * 增加 * * @param string $table * @param array $bind * @return number */ public function insert($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; } /** * 删除 * * @param string $table * @param string $where * @return boolean */ public function delete($table, $where = "") { $where = $this->_whereExpr($where); $sql = "DELETE FROM " . $table . ($where ? " WHERE " .$where : ""); $stmt = $this->query($sql); $res = $stmt->rowCount(); return $res; } /** * 修改 * * @param string $table * @param array $bind * @param string $where * @return boolean */ public function update($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; } /** * 获取新增ID * * @param string $tableName * @param string $primaryKey * @return string */ 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(); } } } /** * * @param string $where * @return null|string */ protected function _whereExpr($where) { if(empty($where)){ return $where; } if(!is_array($where)){ $where = array($where); } $where = implode(" AND ", $where); return $where; } /** * 关闭数据库操作 */ 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。
