一个简单的PHP数据库访问类

a6266318

　　自己写的一个很简单的PHP数据库访问类：database.php
　　<?phpclass Database{private $Connection = NULL;public static function Connect(){$obj = new Database();$ret = $obj->Connection = mysql_connect( DATABASE_IP_ADDRESS, DATABASE_USERNAME, DATABASE_PASSWORD);if( !$ret )throw new Exception( "Error, failed to connect to database. " . mysql_error());$ret = mysql_select_db( DATABASE_NAME, $obj->Connection);if( !$ret ) throw new Exception ("Error, failed to select db " . mysql_error());$ret = mysql_query( 'set names ascii', $obj->Connection);if( !$ret ) throw new Exception ("Error, failed to set the character_set" . mysql_error());return $obj;}function __destruct() { $this->Close();} public function Close(){if( $this->Connection != NULL ){mysql_close($this->Connection);$this->Connection = NULL;}}public function Execute($sql){$rs = mysql_unbuffered_query( $sql, $this->Connection);if( !$rs ) throw new Exception( "Error, failed to execute command '".$sql."',  " . mysql_error());}public function GetSingleVal($sql){$rs = mysql_unbuffered_query( $sql, $this->Connection);if( !$rs ) throw new Exception( "Error, failed to execute query '".$sql."',  " . mysql_error());$row = mysql_fetch_row($rs);if( !$row ) return NULL;return $row[0];}public function GetSingleValOrDefault($sql, $defaultVal){$rs = mysql_unbuffered_query( $sql, $this->Connection);if( !$rs ) throw new Exception( "Error, failed to execute query '".$sql."',  " . mysql_error());$row = mysql_fetch_row($rs);if( !$row ) return $defaultVal;return $row[0];}public function GetCount($sql){$rs = mysql_unbuffered_query( $sql, $this->Connection);if( !$rs ) throw new Exception( "Error, failed to execute query '".$sql."',  " . mysql_error());return mysql_num_rows($rs);}public function GetSingleRow($sql){$rs = mysql_unbuffered_query( $sql, $this->Connection);if( !$rs ) throw new Exception( "Error, failed to execute query '".$sql."',  " . mysql_error());return mysql_fetch_object($rs);}public function GetResultSet($sql){$rs = mysql_query( $sql, $this->Connection);return $rs;}public function Insert( $tableName, &$newRow){$sql = "describe " . $tableName;$rs = mysql_query( $sql, $this->Connection);if( !$rs ) throw new Exception( "Error, failed to describe table '".$tableName."',  " . mysql_error());$fieldsName = "";$fieldsValue = "";$reflectedObj = new ReflectionObject($newRow);$properties = $reflectedObj->getProperties();$count = count($properties);$fields = array();for( $i = 0; $i < $count; $i++){$fields = array_merge( $fields, array($properties[$i]->getName() => $properties[$i]) );}$row = mysql_fetch_object($rs);while($row){if( $reflectedObj->hasProperty($row->Field) ){$fieldVal = $fields[$row->Field]->getValue($newRow);$fieldsName = $fieldsName . $row->Field . ",";if( strpos( $row->Type, "varchar") == 0 ||strpos( $row->Type, "char") == 0 ||strpos( $row->Type, "datetime") == 0 ||strpos( $row->Type, "time") == 0 ){$fieldsValue = $fieldsValue."'".$this->Encode( $fieldVal )."',";}else{$fieldsValue = $fieldsValue . $fieldVal . ",";}}$row = mysql_fetch_object($rs);}$sql = "INSERT INTO ".$tableName."(".rtrim($fieldsName,",").") VALUES(".rtrim($fieldsValue,",").")";$rs = mysql_unbuffered_query($sql, $this->Connection);if( !$rs ) throw new Exception( "Error, failed to execute query '".$sql."',  " . mysql_error());}public function Encode($str){$str = str_replace("\\", "\\\\", $str);$str = str_replace("'", "''", $str); //addslashes($str); return $str;}public function UpdateByPk( $tableName, &$existingRow){$sql = "describe " . $tableName;$rs = mysql_query( $sql, $this->Connection);if( !$rs ) throw new Exception( "Error, failed to describe table '".$tableName."',  " . mysql_error());$updateCause = "";$whereCause = "";$reflectedObj = new ReflectionObject($existingRow);$properties = $reflectedObj->getProperties();$count = count($properties);$fields = array();for( $i = 0; $i < $count; $i++){$fields = array_merge( $fields, array($properties[$i]->getName() => $properties[$i]) );}$row = mysql_fetch_object($rs);while($row){if( $reflectedObj->hasProperty($row->Field) ){$fieldVal = $fields[$row->Field]->getValue($existingRow);if( strpos( $row->Type, "varchar") == 0 ||strpos( $row->Type, "char") == 0 ||strpos( $row->Type, "datetime") == 0 ||strpos( $row->Type, "time") == 0 ){if( $row->Key == "PRI" )$whereCause = $whereCause . "AND " . $row->Field . "='" . $this->Encode( $fieldVal )."' ";else$updateCause = $updateCause. $row->Field . "='".$this->Encode( $fieldVal )."',";}else{if( $row->Key == "PRI" )$whereCause = $whereCause . "AND " . $row->Field . "=" . $fieldVal." ";else$updateCause = $updateCause. $row->Field . "=".$fieldVal.",";}}$row = mysql_fetch_object($rs);}$sql = "UPDATE ".$tableName." SET ".rtrim($updateCause,",")." WHERE 1=1 ".$whereCause."";$rs = mysql_unbuffered_query($sql, $this->Connection);if( !$rs ) throw new Exception( "Error, failed to execute query '".$sql."',  " . mysql_error());}public function Delete($tableName, $deleteRow){$sql = "describe " . $tableName;$rs = mysql_query( $sql, $this->Connection);if( !$rs ) throw new Exception( "Error, failed to describe table '".$tableName."',  " . mysql_error());$whereCause = "";$reflectedObj = new ReflectionObject($deleteRow);$properties = $reflectedObj->getProperties();$count = count($properties);$fields = array();for( $i = 0; $i < $count; $i++){$fields = array_merge( $fields, array($properties[$i]->getName() => $properties[$i]) );}$row = mysql_fetch_object($rs);while($row){if( $reflectedObj->hasProperty($row->Field) ){$fieldVal = $fields[$row->Field]->getValue($deleteRow);if( strpos( $row->Type, "varchar") == 0 ||strpos( $row->Type, "char") == 0 ||strpos( $row->Type, "datetime") == 0 ||strpos( $row->Type, "time") == 0 ){$whereCause = $whereCause . "AND " . $row->Field . "='" . $this->Encode( $fieldVal )."' ";}else{$whereCause = $whereCause . "AND " . $row->Field . "=" . $fieldVal." ";}}$row = mysql_fetch_object($rs);}if( strlen($whereCause) == 0 )throw new Exception("Error, where cause is required!");$sql = "DELETE FROM ".$tableName." WHERE 1=1 ".$whereCause."";$rs = mysql_unbuffered_query($sql, $this->Connection);if( !$rs ) throw new Exception( "Error, failed to execute query '".$sql."',  " . mysql_error());}}?>
　　需要包含数据库的基本信息的setting.php
　　<?phpdefine("DATABASE_IP_ADDRESS", "127.0.0.1");define("DATABASE_USERNAME", "root");define("DATABASE_PASSWORD", "999");define("DATABASE_NAME", "olat");?>
　　使用方式如下：
　　<?phprequire_once '../inc/session.php';require_once '../inc/Logger.php';require_once '../inc/Database.php';require_once '../inc/UID.php';require_once '../inc/phpagi-asmanager.php';require_once '../inc/ajax.php';function Save(&$param){if( !Session::IsLoggedIn() ){return array( "success" => false, "error" => "登录超时!");}// 更新数据库 try{   $db = Database::Connect();$sql = "SELECT * FROM _group WHERE GroupID=". $db->Encode($param->GroupID);$row = $db->GetSingleRow($sql);$isExisting = true;if( !$row ){$isExisting = false;$row = (object)NULL;$row->GroupID = UID::Generate();$row->CreateTime = date("Y-m-d H:i:s"); }$row->GroupName = $param->GroupName;$row->Telephone = $param->Telephone;$row->Fax = $param->Fax;$row->Memo = $param->Memo;if( $isExisting )$db->UpdateByPk( "_group", $row);else$db->Insert( "_group", $row); $db->Close();}catch(Exception $e){Logger::Error("Group Info Save Failed: ". $e->getMessage());return array( "success" => false, "error" => $e->getMessage());}return array( "success" => true, "error" => "");}?>