分类：$elemMatch

2020
09-25

MongoDB操作符中的$elemMatch问题

问题如果MongoDB数据库集合中仅存在一条记录{"_id":ObjectId("5e6b4ef546b5f44e5c5b276d"),"name":"赵小明","used_name":["赵明","赵小朋"],"age":16,"gender":0,"relatives":[{"name":"赵刚","relationship":0},{"name":"秀英","relationship":1}]}我们执行查询db.getCollection('Persion').find({"relatives.name":"赵刚","relativ... 继续阅读 >