MongoDB--一、数据语句

一、数据语句

1.1、增删改查

1.1.1、插入

插入一条

db.comment.insert({"articleid":"100000","content":"今天天气真好，阳光明 媚","userid":"1001","nickname":"Rose","createdatetime":new Date(),"likenum":NumberInt(10),"state":null})

插入多条

db.comment.insertMany([ {"_id":"1","articleid":"100001","content":"我们不应该把清晨浪费在手机上，健康很重要，一杯温水幸福你我
他。","userid":"1002","nickname":"相忘于江湖","createdatetime":new Date("2019-08- 05T22:08:15.522Z"),"likenum":NumberInt(1000),"state":"1"},
{"_id":"2","articleid":"100001","content":"我夏天空腹喝凉开水，冬天喝温开水","userid":"1005","nickname":"伊人憔 悴","createdatetime":new Date("2019-08-05T23:58:51.485Z"),"likenum":NumberInt(888),"state":"1"},
{"_id":"3","articleid":"100001","content":"我一直喝凉开水，冬天夏天都喝。","userid":"1004","nickname":"杰克船 长","createdatetime":new Date("2019-08-06T01:05:06.321Z"),"likenum":NumberInt(666),"state":"1"},
{"_id":"4","articleid":"100001","content":"专家说不能空腹吃饭，影响健康。","userid":"1003","nickname":"凯 撒","createdatetime":new Date("2019-08-06T08:18:35.288Z"),"likenum":NumberInt(2000),"state":"1"},
{"_id":"5","articleid":"100001","content":"研究表明，刚烧开的水千万不能喝，因为烫 嘴。","userid":"1003","nickname":"凯撒","createdatetime":new Date("2019-08- 06T11:01:02.521Z"),"likenum":NumberInt(3000),"state":"1"}
]);

错误处理

插入时指定了 _id ，则主键就是该值。
如果某条数据插入失败，将会终止插入，但已经插入成功的数据不会回滚掉。

try { db.comment.insertMany([
{"_id":"1","articleid":"100001","content":"我们不应该把清晨浪费在手机上，健康很重要，一杯温水幸福你我 他。","userid":"1002","nickname":"相忘于江湖","createdatetime":new Date("2019-08- 05T22:08:15.522Z"),"likenum":NumberInt(1000),"state":"1"},
{"_id":"2","articleid":"100001","content":"我夏天空腹喝凉开水，冬天喝温开水","userid":"1005","nickname":"伊人憔 悴","createdatetime":new Date("2019-08-05T23:58:51.485Z"),"likenum":NumberInt(888),"state":"1"},
{"_id":"3","articleid":"100001","content":"我一直喝凉开水，冬天夏天都喝。","userid":"1004","nickname":"杰克船 长","createdatetime":new Date("2019-08-06T01:05:06.321Z"),"likenum":NumberInt(666),"state":"1"},
{"_id":"4","articleid":"100001","content":"专家说不能空腹吃饭，影响健康。","userid":"1003","nickname":"凯 撒","createdatetime":new Date("2019-08-06T08:18:35.288Z"),"likenum":NumberInt(2000),"state":"1"},
{"_id":"5","articleid":"100001","content":"研究表明，刚烧开的水千万不能喝，因为烫 嘴。","userid":"1003","nickname":"凯撒","createdatetime":new Date("2019-08- 06T11:01:02.521Z"),"likenum":NumberInt(3000),"state":"1"}
]);
} catch (e) { print (e);
}

1.1.2、更新

覆盖更新,不管原纪录是啥直接用“{likenum:NumberInt(1001)}”覆盖

 db.comment.update({_id:"1"},{likenum:NumberInt(1001)})

修改数据中的某一列数据

 db.comment.update({_id:"2"},{$set:{likenum:NumberInt(889)}})

批量修改，更新userid=1003的所有数据

//修改所有符合条件的数据 
db.comment.update({userid:"1003"},{$set:{nickname:"凯撒大帝"}},{multi:true})

1.1.3、列值修改

增加或减少某一列数值型数据，id为3的第一条数据likenum数据列增加1

 db.comment.update({_id:"3"},{$inc:{likenum:NumberInt(1)}})

1.1.4、删除

删除_id=1的记录，如果{}内为空则删除所有数据

 db.comment.remove({_id:"1"})

1.1.5、查询

查询所有

 db.collection.find()
 db.collection.find({})

按条件查询所有

 db.collection.find({userid:'1003'})

按条件查询一条或多条

 db.collection.findOne({userid:'1003'})
 db.collection.find({userid:'1003'}).limit(NUMBER)

1.2、高级查询

1.2.1 数据统计

统计userid=1003的数据量

  db.collection.count({userid:"1003"})

1.2.2 top查询结合跳过

模拟分页，6条数据分3页每页2行数据

db.collection.find().skip(0).limit(2)
db.collection.find().skip(2).limit(2) 
db.collection.find().skip(4).limit(2)

1.2.3 排序(desc acs)

1为升序，-1为降序。注意查询方法优先级sort()> skip()>limit()

db.collection.find().sort({userid:-1,likenum:1})

1.2.4 正则查询

 db.comment.find({content:/^专家/})

1.2.5 比较查询(<,>,>=,<=,!=)

db.集合名称.find({ "field" : { $gt: value }}) // 大于: field > value 
db.集合名称.find({ "field" : { $lt: value }}) // 小于: field < value 
db.集合名称.find({ "field" : { $gte: value }}) // 大于等于: field >= value 
db.集合名称.find({ "field" : { $lte: value }}) // 小于等于: field <= value 
db.集合名称.find({ "field" : { $ne: value }}) // 不等于: field != value

查询likenum列大于700的记录

db.collection.find({likenum:{$gt:NumberInt(700)}})

1.2.6 包含查询（in,not in）

集合中userid字段包含1003或1004的文档

 db.collection.find({userid:{$in:["1003","1004"]}})

集合中userid字段不包含1003和1004的文档

 db.collection.find({userid:{$nin:["1003","1004"]}})

1.2.7 组合查询（and,or）

集合中likenum大于等于700 且小于2000的文档

 db.comment.find({$and:[{likenum:{$gte:NumberInt(700)}},{likenum:{$lt:NumberInt(2000)}}]})

集合中userid为1003，或likenum小于1000的文档记录

 db.comment.find({$or:[ {userid:"1003"} ,{likenum:{$lt:1000} }]})