一个简单的PHP数据库访问类

 自己写的一个很简单的PHP数据库访问类：database.php

 

<?php class 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

<?php define("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：

<?php require_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" => ""); } ?>