mongoDB 常用的條件操作符有 $lt 小于 $gt 大于 $lte 小于或等于 $gte 大于或等于 $ne 不等于 $in in 判斷用于判斷元素是否在數組里面 $nin not in 判斷用于判斷元素是不是不在數組里面 $or 或判斷 > db.tianyc02.find() { "_id" : ObjectId("50ea6eba12729d90ce6e3423"), "name" : "xttt", "age" : 111 } { "_id" : ObjectId("50ea6eba12729d90ce6e3424"), "name" : "xttt", "age" : 222 } { "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 11 } { "_id" : ObjectId("50ea6b7312729d90ce6e341c"), "name" : "xtt", "age" : 22 } > db.tianyc02.find({age:{$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 }

轉載于:https://www.cnblogs.com/SunshineLittleCat/p/8280101.html

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