Thinkphp5数据库操作源码【原创】

1、使用前请配置虚拟主机；将整个文件放在根目录下面；

2、数据库导入；

3、使用框架：thinkphp5.1；

4、版本要求请根据框架要求的版本配置。

//拼接SQL语句
        $sql = "CREATE TABLE IF NOT EXISTS `$tablename` (" ; 
        $key_num;
        $numbers = 0;
        foreach($fields as $key => $val){
            if($val['length']==''){
                $this->error('字段长度不能为空！','add','',1);
            }
            $name = $val['name'];
            $type = $val['type'];
            $notes= $val['notes'];
            if(isset($val['key'])){
                ++$numbers;
                $leng = $val['length'];
                $sql .= " `$name` $type($leng) NOT NULL AUTO_INCREMENT COMMENT '$notes',";
                $key_num = $key;
            }else{
                if($val['length']!=''){
                    $leng = $val['length'];
                    $sql .= " `$name` $type($leng) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '$notes',";
                }else{
                    $sql .= " `$name` $type CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '$notes',";
                }
            }
        }
        if($numbers>1){
            $this->error('主键只能有一个！','add','',1);
        }else if($numbers==0){
            $this->error('必须要选择一个主键！','add','',1);
        }
        $key = $fields[$key_num]['name'];
        $sql .= "PRIMARY KEY (`$key`) USING BTREE ) ENGINE = MyISAM AUTO_INCREMENT = 1 CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '$tablenotes' ROW_FORMAT = Dynamic;";
        $creat = Db::execute($sql);