mongo_2 $in 和 $all 区别

 in 只需满足( )内的某一个值即可, 而$all 必须满足[ ]内的所有值，

> db.table1.find({});

{ "_id" : ObjectId("56a5ce00dd3b78b7f50a298d"), "name" : [ 1, 2, 34, 54, 5, 6, 5 ], "age" : 1222 }

{ "_id" : ObjectId("56a5ce18dd3b78b7f50a298e"), "name" : [ 1, 2, 88, 77, 66, 5, 9, 54 ], "age" : 1222 }

只查5 都能查出来：

  db.table1.find({'name':{$in:[5]}})

{ "_id" : ObjectId("56a5ce00dd3b78b7f50a298d"), "name" : [ 1, 2, 34, 54, 5, 6, 5 ], "age" : 1222 }

{ "_id" : ObjectId("56a5ce18dd3b78b7f50a298e"), "name" : [ 1, 2, 88, 77, 66, 5, 9, 54 ], "age" : 1222 }

> db.table1.find({'name':{$in:[88]}})

{ "_id" : ObjectId("56a5ce18dd3b78b7f50a298e"), "name" : [ 1, 2, 88, 77, 66, 5, 9, 54 ], "age" : 1222 }

 

用all

> db.table1.find({'name':{$all:[5,88]}})

{ "_id" : ObjectId("56a5ce18dd3b78b7f50a298e"), "name" : [ 1, 2, 88, 77, 66, 5, 9, 54 ], "age" : 1222 }

>