要在某个范围内的数组中查找值,请使用$gt和$lt。让我们创建一个包含文档的集合-
> db.demo341.insertOne({ ... "Name": "Chris", ... "productDetails" : [ ... { ... "ProductPrice" : { ... "Price" : 800 ... } ... }, ... { ... "ProductPrice" : { ... "Price" : 400 ... } ... }, ... { ... "ProductPrice" : { ... "Price" : 300 ... } ... } ... ] ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5e53ed5cf8647eb59e5620a7") } > db.demo341.insertOne({ ... "Name": "Chris", ... "productDetails" : [ ... { ... "ProductPrice" : { ... "Price" : 1000 ... } ... }, ... { ... "ProductPrice" : { ... "Price" : 1200 ... } ... }, ... { ... "ProductPrice" : { ... "Price" : 1300 ... } ... } ... ] ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5e53edc1f8647eb59e5620a8") }
在find()
方法的帮助下显示集合中的所有文档-
> db.demo341.find();
这将产生以下输出-
{ "_id" : ObjectId("5e53ed5cf8647eb59e5620a7"), "Name" : "Chris", "productDetails" : [ { "ProductPrice" : { "Price" : 800 } }, { "ProductPrice" : { "Price" : 400 } }, { "ProductPrice" : { "Price" : 300 } } ] } { "_id" : ObjectId("5e53edc1f8647eb59e5620a8"), "Name" : "Chris", "productDetails" : [ { "ProductPrice" : { "Price" : 1000 } }, { "ProductPrice" : { "Price" : 1200 } }, { "ProductPrice" : { "Price" : 1300 } } ] }
以下是在具有多个条件的数组中查找值的查询-
> db.demo341.aggregate([ ... { "$match": { ... "productDetails": { ... "$elemMatch": { ... "ProductPrice.Price": { ... "$gt": 600, ... "$lt": 900 ... } ... } ... } ... }} ... ]).pretty();
这将产生以下输出-
{ "_id" : ObjectId("5e53ed5cf8647eb59e5620a7"), "Name" : "Chris", "productDetails" : [ { "ProductPrice" : { "Price" : 800 } }, { "ProductPrice" : { "Price" : 400 } }, { "ProductPrice" : { "Price" : 300 } } ] }