mongo数组查询，如何仅返回当前匹配数组？
db.test.find();
{
_id: ObjectId('55e99a2190df7a911d6ed1f1'),
list: [
{
"aa": 10,
"data": "test"
},
{
"aa": 1,
"data": "test"
}
]
}
db.test.find({_id: ObjectId('55e99a2190df7a911d6ed1f1'), list: {'$elemMatch': {'aa': 1}}})
预期结果：
{_id: ObjectId('55e99a2190df7a911d6ed1f1'),
list: {
"aa": 1,
"data": "test"
}
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我说我不帅他们就打我，还说我虚伪"_id" : ObjectId("559bb1d1d39f0dcac2658f8e"), "cust_id" : "abc123", "ord_date" : ISODate("2012-10-03T16:00:00Z"), "status" : "A", "price" : 25, "items" : [ { "sku" : "mmm", "qty" : 5, "price" : 2.5 }, { "sku" : "nnn", "qty" : 5, "price" : 2.5 } ] } { "_id" : ObjectId("559bb1ead39f0dcac2658f8f"), "cust_id" : "abc123", "ord_date" : ISODate("2012-10-03T16:00:00Z"), "status" : "B", "price" : 30, "items" : [ { "sku" : "mmm", "qty" : 6, "price" : 3.5 }, { "sku" : "nnn", "qty" : 6, "price" : 3.5 } ] } { "_id" : ObjectId("559bb200d39f0dcac2658f90"), "cust_id" : "abc123", "ord_date" : ISODate("2012-10-03T16:00:00Z"), "status" : "C", "price" : 35, "items" : [ { "sku" : "mmm", "qty" : 7, "price" : 4.5 }, { "sku" : "nnn", "qty" : 7, "price" : 4.5 } ] } db.customer.find({"items.qty":6},{"items.$":1}).pretty() //只返回和查询条件匹配的那一个元素 { "_id" : ObjectId("559bb1ead39f0dcac2658f8f"), "items" : [ { "sku" : "mmm", "qty" : 6, "price" : 3.5 } ] }查询匹配的内嵌文档，你也可以直接查询，如：
db.customer.find({"items.qty":6}).pretty() { "_id" : ObjectId("559bb1ead39f0dcac2658f8f"), "cust_id" : "abc123", "ord_date" : ISODate("2012-10-03T16:00:00Z"), "status" : "B", "price" : 30, "items" : [ { "sku" : "mmm", "qty" : 6, "price" : 3.5 }, { "sku" : "nnn", "qty" : 6, "price" : 3.5 } ] } 对应你上面的查询实现：db.customer.find({"_id":ObjectId("559bb1ead39f0dcac2658f8f"),items: {'$elemMatch': {'sku': "mmm"}}},{"items.$":1}).pretty()
{"_id" : ObjectId("559bb1ead39f0dcac2658f8f"), "items" : [ { "sku" : "mmm", "qty" : 6, "price" : 3.5 } ]}
2019-07-17 19:38:00赞同 展开评论 打赏
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