MongoDB 查詢$關鍵字 $in $or $all

 

 

 屬於：$in 
滿足其中一個元素的數據
把age=13,73 的數據顯示

> db.user.find({age: { $in:[13,73]}})
{ "_id" : ObjectId("5ca7a4b0219efd687462f965"), "id" : 1, "name" : "jack", "age" : 73 }
{ "_id" : ObjectId("5ca7a4c4219efd687462f968"), "id" : 4, "name" : "xiaogang", "age" : 13, "hobby" : [ "羽毛球", "籃球", "足球" ] }

 

只要滿足$in [] 里面的元素 都可以查詢出來

> db.user.find({hobby:{$in:["足球","籃球"]  } })
{ "_id" : ObjectId("5ca7a4c4219efd687462f968"), "id" : 4, "name" : "xiaogang", "age" : 34, "hobby" : [ "羽毛球", "籃球", "足球" ] }

> db.user.find({hobby:{$in:["羽毛球"]  } })
{ "_id" : ObjectId("5ca7a4c4219efd687462f968"), "id" : 4, "name" : "xiaogang", "age" : 34, "hobby" : [ "羽毛球", "籃球", "足球" ] }

 

 

或者：$or 
滿足其中一個字段的元素數據

OR條件：
   MongoDB的OR條件語句使用了操作符$or。如：> db.collection_name.find({$or: [{key1: value1}, {key2: value2}]})

查詢 name="mike" 或者 name ="jack"，兩個條件其中一個條件成立,都返回數據

> db.user.find({$or:[{name:"mike"},{name:"jack"}]} )
{ "_id" : ObjectId("5ca7a4b0219efd687462f965"), "id" : 1, "name" : "jack", "age" : 73 }
{ "_id" : ObjectId("5ca7a4b7219efd687462f966"), "id" : 2, "name" : "mike", "age" : 84, "gender" : "男" }

 

$all:
滿足所有元素的數據

符合列表里面元素條件就可以 顯示數據

> db.user.find({hobby:{$all:["足球"]  } })
{ "_id" : ObjectId("5ca7a4c4219efd687462f968"), "id" : 4, "name" : "xiaogang", "age" : 34, "hobby" : [ "羽毛球", "籃球", "足球" ] }


> db.user.find({hobby:{$all:["足球","羽毛球"]  } })
{ "_id" : ObjectId("5ca7a4c4219efd687462f968"), "id" : 4, "name" : "xiaogang", "age" : 34, "hobby" : [ "羽毛球", "籃球", "足球" ] }

> db.user.find({hobby:{$all:["足球","桌球"]  } })