添加非常多的Mongo操作方法 · Pull Request !15 · ThinkPHP/thinkphp32

1，允许返回Mongo对象，进行MongoClient原生操作
MongoModel->getDB();
MongoModel->getCollection();

```php
$m = new MongoModel();
$c = $m->getCollection();
$c->ensureIndex(array("day"=>1));
 → array(
  'createdCollectionAutomatically' => false,
  'numIndexesBefore' => 1,
  'numIndexesAfter' => 2,
  'ok' => 1
)
```

2，添加多种查询条件，支持子查询条件，支持or nor not逻辑，合并deeka提供的多层逻辑的查询方法

```php
		//子查询OR逻辑
		$map['device.channel'] = "umeng";
		$map['_logic'] = 'and';
		$map['_complex'] = array("act"=>"down", "group"=>"download", '_logic'=>"or");
		$result = $model->field(array("act"=>true, "group"=>true, "_id"=>false))->where($map)->limit(2)->select();
		print_r($result);
		print_r($model->_sql());
		echo PHP_EOL;
		
		//子查询OR逻辑
		$map['_complex'] = array('_logic'=>"or", array("act"=>"down"), array("group"=>"download"));
		$result = $model->where($map)->find();
		print_r($result);
		print_r($model->_sql());
		echo PHP_EOL;
		
		//子查询OR逻辑
    	$map = array();
    	$map['_complex'] = array('_logic'=>"or", array("act"=>"down"), array("group"=>"download"));
    	$result = $model->field(array("act"=>true, "group"=>true, "_id"=>false))->where($map)->find();
    	print_r($result);
    	print_r($model->_sql());
    	echo PHP_EOL;
    	
    	//子查询 AND 逻辑
    	$map = array();
    	$map['_complex'] = array('_logic'=>"and", array("act"=>"down"), array("group"=>"download"));
    	$result = $model->field(array("act"=>true, "group"=>true, "_id"=>true))->where($map)->find();
    	print_r($result);
    	print_r($model->_sql());
    	echo PHP_EOL;
    	
    	//子查询 nor 逻辑
    	$map = array();
    	$map['_complex'] = array('_logic'=>"nor", array("act"=>"down"), array("group"=>"download"));
    	$result = $model->field(array("act"=>true, "group"=>true, "_id"=>true))->where($map)->find();
    	print_r($result);
    	print_r($model->_sql());
    	echo PHP_EOL;
    	
    	//$not查询
    	$map = array();
    	$map['day'] = '20140710';
    	$map['act'] = array('$exists'=>true, '$not'=>array('$in'=>array("click", "listview")) );
    	$map['_complex'] = array('_logic'=>"nor", array("act"=>"down"), array("group"=>"download"));
    	$result = $model->field(array("act"=>true, "group"=>true, "_id"=>true))->where($map)->find();
    	print_r($result);
    	print_r($model->_sql());
    	echo PHP_EOL;
    	
    	//$not查询
    	$map = array();
    	$map['day'] = '20140710';
    	$map['_logic'] = 'or';
    	$map['act'] = array('$exists'=>true, '$not'=>array('$in'=>array("click", "listview")) );
    	$map['_complex'] = array('_logic'=>"nor", array("act"=>"down"), array("group"=>"download"));
    	$result = $model->field(array("act"=>true, "group"=>true, "_id"=>true))->where($map)->find();
    	print_r($result);
    	print_r($model->_sql());
    	echo PHP_EOL;

```
3，支持更加丰富的获取field字段的功能，支持屏蔽_id字段

```php
$result = $model->field(array("act"=>true, "group"=>true, "_id"=>true))->where($map)->find();
```

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