thinkphp下mongo的操作

1.多个条件语句,网上很多只是一个大于或者一个小于，没有2个合并的,如大于2并且小于4的

$where['_string'] = 'this.b > 2 & this.b<4';

2.group

mysql:$res = $model->where(['sTaskId'=>['$in'=>$task_array]])->group('a')->field('a,sum(a)')->select();mongodb:$key = ['a'=>1]; //groupby的字段$init = ['num'=>0];//统计的初始值$option = array('table' => 'course’, // 表名'condition’=>['sTaskId'=>['$in'=>$task_array]], //group中过滤条件);//必须要带option$reduce = "function(obj, prev){prev.num = prev.num+obj.a}";$model = new TestModel();$res = $model->group($key, $init, $reduce, $option);这里讲一下tp的mongo扩展是有问题的，在group里调用where会无效，具体解决方案是要在mongo.class.php文件a.把$query改为如下:$query  =  $this->parseWhere(isset($options['condition'])?$options['condition']:array());当然$this->queryStr  也要改的b.把$group改为:$group = $this->_collection->group($keys,$initial,$reduce,$query);

3.如果你要用model模型去查询，并且你的主配置是mysql，那就需要先在配置文件配置

'mongo' => [DB_TYPE =>  mongo            DB_HOST => localhost   DB_NAME => testDB_PORT =>  40000DB_PREFIX =>'' DB_USER => ''DB_PWD => ''],

然后在model文件里配置，
a.protected $trueTableName = '表名';
b.protected $connection = '驱动名，这里是mongo';
c.该model继承MongoModel

4.批量更新

mysql里只要$res = $model->save(['a'=>1']);mongo的话需要写成$res = $model->where([])->save(['a'=>1]);

5.mongo注意点：

mongo对于数据类型的控制比较严格，如果你存个int的1，用'1'去查是查不到的!