PHP add, delete, modify, check package
php add, delete, modify and check encapsulation
First create a class named "DB"; then in the constructor of the "DB" class Connect to the database; then write additions, deletions, modifications and queries based on the connection instance; finally instantiate the "DB" class and set it as a global variable.
Encapsulation code:
<?php /** * 数据库配置信息 */ define('DB_HOST','127.0.0.1'); //服务器 define('DB_USER','root'); //数据库用户名 define('DB_PASSWORD','123456'); //数据库密码 define('DB_NAME','TEST'); //默认数据库 define('DB_CHARSET','utf8'); //数据库字符集 define('TIMEZONE',"PRC"); //时区设置 date_default_timezone_set(TIMEZONE); /** * 类名:DB * 说明:数据库操作类 */ class DB { public $host; //服务器 public $conn; //数据库连接变量 /** * DB类构造函数 */ public function DB($host=DB_HOST ,$username=DB_USER,$password=DB_PASSWORD,$db_name=DB_NAME) { $this->host = $host; $this->username = $username; $this->password = $password; $this->db_name = $db_name; $this->conn = mysql_connect($host,$username,$password) or die ('数据库连接失败!错误原因:'.mysql_error()); mysql_select_db($db_name)or die('数据库选定失败!错误原因:'.mysql_error()); mysql_query("SET CHARACTER SET utf8"); } /** * 关闭数据连接 */ public function close() { mysql_close($this->conn); } /** * @description调用方法用 * @param $sql * @return array */ public function QueryAll($sql) { $this->open(); $rs = mysql_query($sql,$this->conn); $objList = array(); while($obj = mysql_fetch_object($rs)) { if($obj) { $objList[] = $obj; } } $this->close(); return $objList; } /** * description查询全部返回Json格式,通讯用 * @param $sql * @return string */ public function QueryAllJson($sql) { echo $sql; $this->open(); $rs = mysql_query($sql,$this->conn); $objList = array(); $i=0; while($obj = mysql_fetch_object($rs)) { $objList[$i]=$obj; $i++; } $this->close(); return json_encode(array("result"=>"success",'data'=>$objList)); } /** * @description 插入数据到数据库中 * @param $tableName 表名 * @param array $columns 包含表中所有字段名的数组。默认空数组,则是全部有序字段名 * @param array $values 包含对应所有字段的属性值的数组 * @return int */ public function insertData($tableName,$columns=array(),$values=array()) { $sql = 'insert into '.$tableName .'( '; for($i = 0; $i < sizeof($columns);$i ++) { $sql .= $columns[$i]; if($i < sizeof($columns) - 1) { $sql .= ','; } } $sql .= ') values ( '; for($i = 0; $i < sizeof($values);$i ++) { $sql .= "'".$values[$i]."'"; if($i < sizeof($values) - 1) { $sql .= ','; } } $sql .= ' )'; $this->open(); mysql_query($sql,$this->conn); return true; // $id = mysql_insert_id($this->conn);//取得上一步操作产生的ID(2) // $this->close();(2) // return $id;//(2) } /** * 通过表中的某一属性获取数据 */ public function getDataByAtr($tableName,$atrName,$atrValue){ @$data = $this->QueryAll("SELECT * FROM ".$tableName." WHERE $atrName = '$atrValue'"); if(count($data)!=0)return $data; return NULL; } /** * description_ * 通过表中的"id",删除记录 */ public function delete($tableName,$atrName,$atrValue){ echo $tableName; $this->open(); $deleteResult = false; if(mysql_query("DELETE FROM ".$tableName." WHERE $atrName = '$atrValue'")) $deleteResult = true; $this->close(); if($deleteResult) return true; else return false; } /** * 更新表中的属性值 */ public function updateParamById($tableName,$atrName,$atrValue,$key,$value){ $db = new DB(); $db->open(); if(mysql_query("UPDATE ".$tableName." SET $key = '$value' WHERE $atrName = '$atrValue' ")){ //$key不要单引号 $db->close(); return true; } else{ $db->close(); return false; } } /* * @description: 取得一个table的所有属性名 * @param: $tbName 表名 * @return:字符串数组 */ public function fieldName($tableName){ $resultName=array(); $i=0; $this->open(); $result = mysql_query("SELECT * FROM ".$tableName); while ($property = mysql_fetch_field($result)){ $resultName[$i++]=$property->name; } $this->close(); return $resultName; } }
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