mongodb

基本命令

document database: data -> js objects

js语法:

for(i=0; i<10; i++) { print('hello'); };

save document {a: 99} to collection scores:

db.scores.save({a: 99});
db.scores.find();

shell一次只显示10条结果， it 可以显示下一批

查找all documents where a == 2:

db.scores.find({a: 2});

查找documents where a > 15:

db.scores.find({a: {'$gt': 15}});

• $lt - ‘<’, $lte - ‘<=’,
• $gte - ‘>=’, $ne - ‘!=’
• $in - ‘is in array’, $nin - ‘! in array’

修改name为johnny的整个document:

db.users.update({name: 'Johnny'}, {name: 'Cash', languages: ['english']});

部分更改:

db.users.update({name: 'Cash'}, {'$set': {'age': 50} });

push and pull items from arrays:

db.users.update({name: 'Sue'}, {'$pull': {'languages': 'scala'} });
db.users.update({name: 'Sue'}, {'$push': {'languages': 'ruby'} });

删除符合条件的documents:

db.users.remove({name: 'Sue'});

delete everything from a collection:

db.scores.remove();

例子

命令行:

$ mongo
  MongoDB shell version: 2.0.0
  connecting to: test
  > use example
  switched to db example
  > show dbs
  > db.movies.insert({title: "The Matrix", year: 1999});
  > db.movies.insert({title: "Star Wars", year: 1977});
  > db.movies.find();
  { "_id" : ObjectId("4e7018a79abdbdfb5d235b6c"), "title" : "The Matrix", "year" : 1999 }
  { "_id" : ObjectId("4e7018dd9abdbdfb5d235b6d"), "title" : "Star Wars", "year" : 1977 }
  > quit()