pdo 帮助类 pdo class php 数据库 处理层 pdo dbhelper

<?phpdefine("DB_SERVER","127.0.0.1");define("DB_PORT",3306);define("DB_CATALOG","test");define("DB_USERID","root");define("DB_PASSWORD","");class DAL { private static $__queries=0; private static $__PDO=null; private static function connect() { if(isset(self::$__PDO))return; try { $dsn="mysql:host=".DB_SERVER.";port=".DB_PORT.";dbname=".DB_CATALOG; self::$__PDO=new PDO($dsn, DB_USERID, DB_PASSWORD); } catch(PDOException $e) { raiseError($e); } } /** * * @param <type> $sql * @param <type> $params * @return <type> $stmt * * * $stmt = $dbh->prepare("INSERT INTO REGISTRY (name, value) VALUES (?, ?)"); * $stmt->bindParam(1, $name); * $stmt->bindParam(2, $value); * // insert one row * $name = 'one'; * $value = 1; * $stmt->execute(); * * $sql = "select * from SampleMarry where UserId=?"; * $arr[0] = $userId; * return DAL::getall($sql,$arr); */ private static function execute($sql,$params) { self::connect(); try { $stmt=self::$__PDO->prepare($sql); if($params!==null) { if(is_array($params) || is_object($params)) { $i=1; foreach($params as $param) { $stmt->bindValue($i++,$param); } } else { $stmt->bindValue(1,$params); } } if($stmt->execute()) { self::$__queries++; return $stmt; } else { $err=$stmt->errorInfo(); throw new PDOException($err[2],$err[1]); } } catch(PDOException $e) { raiseError($e); } } /************************************************************************ public function start ************************************************************************/ //for insert start public static function insert($sql,$params=null) { $stmt=self::execute($sql,$params); return self::$__PDO->lastInsertId(); } /** * * @param <type> $table * @param <type> $entity * @return <type> $data=new stdClass; $data->SampleBook_Id=$bookid; $data->UserId=$userId; $data->EducationType="School"; $data->Name=$scoolname; $data->Subject=""; $data->AttendedDate=strtotime($startdate); $data->FinishedDate=strtotime($enddate); return DAL::createRecord("SampleEducation",$item); */ public static function createRecord($table,$entity) { $f=array(); $v=array(); $c=0; foreach($entity as $prop=>$val) { $f[]=$prop; $v[]=$val; $c++; } $sql="INSERT INTO $table (".implode(",",$f).") VALUES(".trim(str_repeat('?,',$c),",").")"; return self::insert($sql,$v); } //for insert end //for delete start /** * * @param <type> $sql * @param <type> $params * @return <type> $sql="delete from SampleLived where id=?"; $arr[] = $id; DAL::delete($sql,$arr); */ public static function delete($sql,$params=null) { $stmt=self::execute($sql,$params); return $stmt->rowCount(); } public static function remove($sql,$params=null) { $stmt=self::execute($sql,$params); return $stmt->rowCount(); } //for delete end //for update start public static function update($sql,$params=null) { $stmt=self::execute($sql,$params); return $stmt->rowCount(); } public static function updateRecord($table,$entity,$pkdfiledname) { $f=array(); $v=array(); foreach($entity as $prop=>$val) { if($prop==$pkdfiledname)continue; $f[]=$prop."=?"; $v[]=$val; } $v[]=$entity->$pkdfiledname; $sql="UPDATE $table SET ".trim(implode(',',$f),',')." WHERE $pkdfiledname=?"; return self::update($sql,$v); } //for update end //for query start public static function query($sql,$params=null) { $stmt=self::execute($sql,$params); return new DBRecordset($stmt); } public static function getOne($sql,$params=null) { $stmt=self::execute($sql,$params); return $stmt->fetchColumn(); } public static function getRow($sql,$params=null) { $stmt=self::execute($sql,$params); return $stmt->fetch(PDO::FETCH_OBJ); } public static function getall($sql,$params=null) { $stmt=self::execute($sql,$params); return $stmt->fetchAll(PDO::FETCH_ASSOC); } //for query end //for Transaction start public static function beginTransaction() { return self::$__PDO->beginTransaction(); } public static function rollBack() { return self::$__PDO->rollBack(); } public static function commit() { return self::$__PDO->commit(); } //for Transaction end public static function pagination($countSql,$selectSql,$params,&$pageNow,$pageSize,&$count) { if($pageNow<=0)$pageNow=1; $count=self::getOne($countSql,$params); $pageCount=ceil($count/$pageSize); if($pageNow>$pageCount)$pageNow=$pageCount; if($pageNow<=0)$pageNow=1; $offset=($pageNow-1)*$pageSize; $sql=$selectSql.' LIMIT '.$offset.','.$pageSize; return self::query($sql,$params); } /************************************************************************ public function end ************************************************************************/}class DBRecordset { private $PDOStatement; public function __construct(&$stmt) { $this->PDOStatement=&$stmt; $this->PDOStatement->setFetchMode(PDO::FETCH_OBJ); } public function next() { return $this->PDOStatement->fetch(); } public function count() { //for mysql PDOStatement will return the number of rows in the resultset return $this->PDOStatement->rowCount(); } public function getAllRows() { return $this->PDOStatement->fetchAll(); } public function columnCount() { return $this->PDOStatement->columnCount(); } public function free() { $this->PDOStatement=null; } public function __destruct() { $this->free(); }}?>