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}})
模糊查询：
db.collname.find({"actors.name":/Catterfeld/i}, {"tag":1,"_id":1,"actors":1})
参考推荐：