MongoDB常用数据库命令大全

help
db.help();
db.yourColl.help();

use raykaeso;

show dbs;

db.dropDatabase();

db.cloneDatabase(“127.0.0.1”);

db.copyDatabase(“mydb”, “temp”, “127.0.0.1”);

db.repairDatabase();

db.getName()/db;

db.stats();

db.version();

db.getMongo();

db.getPrevError();

db.resetError();

db.createCollection(“collName”, {size: 20, capped: 5, max: 100});//创建成功会显示{“ok”:1}

//判断集合是否为定容量db.collName.isCapped();

db.getCollection(“account”);

db.getCollectionNames();

db.printCollectionStats();

db.yourColl.count();

db.yourColl.dataSize();

db.yourColl.getDB();

db.coll.stats();

db.coll.totalSize();

db.coll.storageSize();

db.coll.renameCollection(“ray”);

db.coll.drop();

db.createUser({user: 'username', pwd: 'xxxx', roles: [{role: 'readWrite', db: 'dbname'}]});

db.auth(“ray”, “123456”);

show users;

db.removeUser(“userName”);

db.userInfo.find();

db.userInfo.distinct(“name”);

db.userInfo.find({“age”: 22});

db.userInfo.find({age: {$gt: 22}}); 
相当于：select * from userInfo where age>22;

db.userInfo.find({age: {$lt: 22}});
相当于：select * from userInfo where age<22; 

db.userInfo.find({age: {$gte: 25}}); 
相当于：select * from userInfo where age >= 25;

db.userInfo.find({name: /mongo/});
//相当于%%

select * from userInfo where name like ‘%mongo%';

db.userInfo.find({}, {name: 1, age: 1});

相当于：select name, age from userInfo;

db.userInfo.find({age: {$gt: 25}}, {name: 1, age: 1});

相当于：select name, age from userInfo where age <25;

db.userInfo.find().limit(5);

相当于：select * from userInfo limit 5;

db.userInfo.find().skip(10);

相当于：select count() from userInfo as total;

select from userInfo limit 10,total;

db.userInfo.find().limit(10).skip(5);

db.userInfo.find({$or: [{age: 22}, {age: 25}]});

相当于：select * from userInfo where age = 22 or age = 25;

db.userInfo.findOne();

db.userInfo.find().limit(1);

相当于：select * from userInfo limit 1;

db.userInfo.find({age: {$gte: 25}}).count();

相当于：select count(*) from userInfo where age >= 20;

db.userInfo.ensureIndex({name: 1});

db.userInfo.ensureIndex({name: 1, ts: -1});

db.userInfo.getIndexes();

db.userInfo.totalIndexSize();

db.users.reIndex();

db.users.dropIndex(“name_1″);

db.users.dropIndexes();

db.users.save({name: ‘zhangsan', age: 25, sex: true});

db.users.update({age: 25}, {$set: {name: ‘changeName'}}, false, true);
相当于：update users set name = ‘changeName' where age = 25;

db.users.update({name: ‘Lisi'}, {$inc: {age: 50}}, false, true);
相当于：update users set age = age + 50 where name = ‘Lisi';

db.users.update({name: ‘Lisi'}, {$inc: {age: 50}, $set: {name: ‘hoho'}}, false, true);
相当于：update users set age = age + 50, name = ‘hoho' where name = ‘Lisi';

db.users.remove({age: 132});

db.users.findAndModify({
query: {age: {$gte: 25}},
sort: {age: -1},
update: {$set: {name: ‘a2′}, $inc: {age: 2}},
remove: true
});