PHP历程（封装的增删改查方法）

<?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 $username;        //数据库用户名
    public $password;        //数据密码
    public $db_name;          //数据库名
    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;
    }
    /**
     * 打开数据库连接
     */
    public function open()
    {
        $this->conn = mysql_connect($this->host,$this->username,$this->password)or die (‘数据库连接失败！</br>错误原因：‘.mysql_error());
        mysql_select_db($this->db_name)or die(‘数据库选定失败！</br>错误原因：‘.mysql_error());
        mysql_query("SET CHARACTER SET utf8");
    }
    /**
     * 关闭数据连接
     */
    public function close()
    {
        mysql_close($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;
    }

}

<?php
require_once("./db.class.php");

class User{

    /**
     * description_插入数据到XX
     * @param $tableName
     * @param $name
     * @param $password
     * @return int
     */
    public function insert($tableName,$name,$password){
        $db = new DB();
        $resultId = $db->insertData("$tableName",array(‘name‘,‘password‘),array($name,$password));
        return $resultId;
    }
    /**
     * @description根据ID或XXX查询一条数据，user所查询的表，id是字段名
     * @param $table
     * @param $name
     * @param $value
     * @return array|null
     */
    public static function getUserById($table,$name,$value){
        $db = new DB();
        return $db->getDataByAtr("$table",‘$name‘,$value);
    }
    /**
     * @description根据name查询一条数据
     * @param $name
     * @return array|null
     */
    public static function getUserByName($name){
        $db = new DB();
        @$data = $db->QueryAll("SELECT * FROM user WHERE name = ‘".$name."‘");
        if(count($data)!=0)return $data;
        else return null;
    }
    /**
     * @description_获取全部数据，调方法使用
     * @param $tableName
     * @return null
     */
    public static function QueryAll($tableName){
        $db = new DB();
        @$data = $db->QueryAll("select * FROM"." ".$tableName);
        if(count($data)!=0) echo $data;
        else return null;
    }
    /**
     * @description_获取全部数据，通讯使用
     * @param $tableName
     */
    public static function QueryAllJson($tableName){
        $db = new DB();
        @$data = $db->QueryAllJson("SELECT * FROM ".$tableName."");
        if(count($data)!=0) echo $data;
        else echo false;
    }
    /**
     * description分页查询，返回Json格式。通讯用，echo
     * @param $start
     * @param $count
     */
    public static function QueryWithPage($start,$count){
        $db = new DB();
        @$data = $db->QueryAllJson("select id,name,password from user order by id limit"." ".$start.",".$count);
        if(count($data)!=0) echo $data;
        else echo false;
    }
    /**
     * @description_删除数据，根据ID，user是表名，id是....
     * @param $tableName
     * @param $name
     * @param $value
     * @return bool
     */
    public static function deleteByUid($tableName,$name,$value){
        $db = new DB();
        if($db->delete("$tableName","$name",$value)) return true;
        else return false;
    }
}

<?php
header("Content-Type:text/html; charset=utf8");
require_once("./user.class.php");
$user = new User();
//$user->insert(‘asssss‘);
//$user->getUserById(1);
//$userA = User::getUserById(1);
//$userB = User::QueryWithPage(6,10);
//$userB = User::QueryAllJson(‘user‘);
//$user=$user->insert(‘user‘,‘www‘,‘sd‘);
//$userB = User::deleteByUid(‘user‘,‘id‘,7);
//foreach ($user as $u) {
//    echo json_encode(array("result"=>"success","date"=>"asd"));
//}
//构造函数被注释掉了，如果有构造函数