mongoDB条件操作符

mongoDB 常用的条件操作符有

$lt 小于

$gt 大于

$lte 小于或等于

$gte 大于或等于

$ne 不等于

$in in 判断用于判断元素是否在数组里面

$nin not in 判断用于判断元素是不是不在数组里面

$or 或判断

> db.tianyc02.find()

{ "_id" : ObjectId("50ea6eba12729d90ce6e3423"), "name" : "xttt", "age" : 111 }

{ "_id" : ObjectId("50ea6eba12729d90ce6e3424"), "name" : "xttt", "age" : 222 }

{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 11 }

{ "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 }

> db.tianyc02.find({age:{$lt:100}})

{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 11 }

{ "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 }

> db.tianyc02.find({age:{$lt:100,$gt:20}})

{ "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 }

> db.tianyc02.find({age:{$ne:11}})

{ "_id" : ObjectId("50ea6eba12729d90ce6e3423"), "name" : "xttt", "age" : 111 }

{ "_id" : ObjectId("50ea6eba12729d90ce6e3424"), "name" : "xttt", "age" : 222 }

{ "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 }

2.2 $in & $nin

> db.tianyc02.find()

{ "_id" : ObjectId("50ea6eba12729d90ce6e3423"), "name" : "xttt", "age" : 111 }

{ "_id" : ObjectId("50ea6eba12729d90ce6e3424"), "name" : "xttt", "age" : 222 }

{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 11 }

{ "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 }

> db.tianyc02.find({age:{$in:[11,22]}})

{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 11 }

{ "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 }

> db.tianyc02.find({age:{$nin:[11,22]}})

{ "_id" : ObjectId("50ea6eba12729d90ce6e3423"), "name" : "xttt", "age" : 111 }

{ "_id" : ObjectId("50ea6eba12729d90ce6e3424"), "name" : "xttt", "age" : 222 }

2.3 $or

> db.tianyc02.find({$or:[{age:11},{age:22}]})

{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 11 }

{ "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 }

> db.tianyc02.find({$or:[{age:11},{name:‘xttt‘}]})

{ "_id" : ObjectId("50ea6eba12729d90ce6e3423"), "name" : "xttt", "age" : 111 }

{ "_id" : ObjectId("50ea6eba12729d90ce6e3424"), "name" : "xttt", "age" : 222 }

{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 11 }

原文地址：https://www.cnblogs.com/SunshineLittleCat/p/8280101.html