mongodb数组查询

[root@sunrise16 bin]# ./mongo 

MongoDB shell version: 2.0.0
connecting to: test

 

插入一个带有数组元素的文档
> db.food.insert({"fruit": ["apple", "banana", "peach"]}) 
> db.food.find() 
{ "_id" : ObjectId("4ea6a4ef0b12b1d429b4057f"), "fruit" : [ "apple", "banana", "peach" ] }

 

查询数组元素中包含某个值的文档
> db.food.find({"fruit": "banana"}) 
{ "_id" : ObjectId("4ea6a4ef0b12b1d429b4057f"), "fruit" : [ "apple", "banana", "peach" ] }

> db.food.find({"fruit": {"$all": ["banana"]}}) 
{ "_id" : ObjectId("4ea6a4ef0b12b1d429b4057f"), "fruit" : [ "apple", "banana", "peach" ] }

 

查询匹配指定数组的文档。注意要完全相同，数量和顺序都不能有错，否则找不到

> db.food.find({"fruit": ["banana"]}) 
> db.food.find({"fruit": ["apple", "banana", "peach"]}) 
{ "_id" : ObjectId("4ea6a4ef0b12b1d429b4057f"), "fruit" : [ "apple", "banana", "peach" ] }
> db.food.find({"fruit": ["banana", "apple", "peach"]})

 

查询数组元素中包含多个指定值的文档，全部包含，顺序无关

> db.food.find({"fruit": {"$all": ["banana", "apple", "peach"]}}) 
{ "_id" : ObjectId("4ea6a4ef0b12b1d429b4057f"), "fruit" : [ "apple", "banana", "peach" ] }

 

查询包含多个值之一的文档

> db.food.find({"fruit":["banna","cherry"]}) 
> db.food.find({"fruit":{"$all":["banna","cherry"]}}) 
> db.food.find({"fruit":{"$in":["banna","cherry"]}})

 

查询指定长度的数组。但不能查询指定长度范围的数组

> db.food.find({"fruit": {"$size": 3}}) 
{ "_id" : ObjectId("4ea6a4ef0b12b1d429b4057f"), "fruit" : [ "apple", "banana", "peach" ] }
> db.food.find({"fruit": {"$size": 2}}) 
> db.food.find({"fruit": {"$size": 4}})