Yii2框架增删改查类

Yii2框架增删改查自定义类归纳：

<?php
namespace common\models;

use \Yii;


class DB 
{
    
    public static function query($sql,$a=''){
        $reslt = \Yii::$app->db->createCommand($sql)->execute();
        return $reslt;
    }


    // 返回一行 (第一行) 如果该查询没有结果则返回 false
    public static function get_one($sql, $type = ''){
        $r = \Yii::$app->db->createCommand($sql)->queryOne();
        if($type) return (object)$r;
        return $r;
    }
     
    // 返回一列 (第一列) 如果该查询没有结果则返回空数组
    public static function get_column($sql){
        $r = \Yii::$app->db->createCommand($sql)->queryColumn(); 

        return $r;
    }
    
    // 返回一个标量值 如果该查询没有结果则返回 false
    public static function get_scalar($sql){
        $r = \Yii::$app->db->createCommand($sql)->queryScalar();
        return $r;
    }

    // 返回多行. 每行都是列名和值的关联数组. 如果该查询没有结果则返回空数组
    public static function get_all($sql){
        $data = \Yii::$app->db->createCommand($sql)->queryAll();
        return $data;
    }
    
    public static function limit($page=1,$total=10){
        return "limit " . (Yii::$app->request->post('page',$page) - 1) * Yii::$app->request->post('total',$total) . ", " . Yii::$app->request->post('total',$total);
    }

    public static function insertid(){
        return \Yii::$app->db->getLastInsertID();
    }

    public static function nums($sql){
        return count(\Yii::$app->db->createCommand($sql)->queryAll());
    }
    
    public static function dowith($str='')
    {
        $str = str_replace("'",".",$str);
        //$str = str_replace('"','',$str);
        return $str;
    }
            
    static function implode_field_value($array, $glue = ',') {
        $sql = $comma = '';
        foreach ($array as $k => $v) {
            $sql .= $comma."`$k`= '".DB::dowith($v)."'";
            $comma = $glue;
        }
        return $sql;
    }

    public static function insert($table, $data=[], $return_insert_id = false, $replace = false, $silent = false) {
        $sql = DB::implode_field_value($data);
        $cmd = $replace ? 'REPLACE INTO' : 'INSERT INTO';
        $silent = $silent ? 'SILENT' : '';
        DB::query("$cmd $table SET $sql", $silent);
        $insertid = DB::insertid();
        return $insertid;
    }

    public static function batchInsert($table, $data ) {
        foreach ($data as $val){
            DB::insert($table, $val);
        }
        return true;
    }
    

        
    public static function update($table, $data, $condition, $unbuffered = false, $low_priority = false) {
        $sql = DB::implode_field_value($data);
        $cmd = "UPDATE ".($low_priority ? 'LOW_PRIORITY' : '');
        $where = '';
        if(empty($condition)) {
            $where = '1';
        } elseif(is_array($condition)) {
            $where = DB::implode_field_value($condition, ' AND ');
        } else {
            $where = $condition;
        }
        $res = DB::query("$cmd $table SET $sql WHERE $where");
        return $res;
    }
    
}