官方的说明、Demo地址:https://www.mongodb.com/docs/manual/tutorial/query-array-of-documents/ 1.2 使用$elemMatch操作符查询,本文侧重该方式。 官方说明:The$elemMatchoperator matches documents that contain an array field with at least one element that matches all the specified query criteria. 就是说$...
MongoDB Manual: code examples for query operations on array fields. Learn how to query an array and an array element or field, query on the array field as a whole, query if a field is in an array, and query by array size.
使用$elemMatch操作符在大量嵌入式文档中指定多个条件,以使至少一个嵌入式文档满足所有指定条件。 以下示例查询满足如下条件的文档——instock数组至少有一份嵌入式文档,该文档同时包含等于5的字段qty和等于A的字段warehouse: 以下示例将查询instock数组至少包含一个嵌入文档,且该文档包含大于qty且小于或等于20的字段10:...
我们可以使用$eleMatch消除顺序一致性规则: 方法二: 结果: 和想要的有点不一样,他是把array每个{}都打开,这样就会有两条数据返回。 The following example queries for documents where theinstockarray has at least one embedded document that contains the fieldqtyequal to5 and at least one embedded documen...
MongoDB Database Name database True string The name of the database. MongoDB Collection Name collection True string The name of the collection. pipeline pipeline object items Returns 展開表格 NamePathTypeDescription documents documents array of object documents items documents object Update...
Finally, we can do a simple query to check which items are out of stock: > db.stock.find({"in_stock" : 0}) Query Criteria Queries can go beyond the exact matching described in the previous section; they can match more complex criteria, such as ranges, OR-clauses, and negation. ...
The return type is an array, not an object The identifier of the created object is defined as “_id”, not “id” as is expected by the client SDKs. We have to deal with those issues. The first one is actually a feature of MongoDB – you can “bulk-insert” multiple items at ...
"'quantity' must be a short or long integer in [0, 100)" }, } } } } } } }); With the schema above, we enforce that any order inserted or updated in the orders collection contain a lineitems array of 1 to 10 documents that all have sku , unit_price and quantity attributes (...
use Jenssegers\Mongodb\Eloquent\Model as Eloquent; class User extends Eloquent { public function items() { return $this->hasMany('Item'); } }And the inverse relation:use Jenssegers\Mongodb\Eloquent\Model as Eloquent; class Item extends Eloquent { public function user() { return $this->...
「$match:目标是筛选出所有状态为"completed"的订单。」 **$unwind:**将每个订单中的items数组中的每个元素拆分成独立的文档。 「$group」:按items.product_id对文档进行分组,并计算每个产品的总数量和总收入。 **$sort:**根据total_revenue字段的值降序排序文档。