help

db.help();

db.yourColl.help();

db.youColl.find().help();

rs.help();

show dbs;

db.dropDatabase();

db.cloneDatabase(“127.0.0.1”); 

db.copyDatabase("mydb", "temp", "127.0.0.1");

db.repairDatabase();

db.getName();

db.stats();

db.version();

db.getMongo();

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

db.getCollection("account");

db.getCollectionNames();

db.printCollectionStats();

db.addUser("name");

db.addUser("userName", "pwd123", true); 

show users;

db.removeUser("userName");

print("Hello World!");

tojson(new Object());

tojson(new Object('a'));

for (var i = 0; i < 30; i++) {

... db.users.save({name: "u_" + i, age: 22 + i, sex: i % 2});

... };

for (var i = 0; i < 30; i++) db.users.save({name: "u_" + i, age: 22 + i, sex: i % 2});

var cursor = db.users.find();

while (cursor.hasNext()) {

printjson(cursor.next());

}

var cursor = db.users.find();

while (cursor.hasNext()) { printjson(cursor.next); }

db.users.find().forEach(printjson);

var cursor = db.users.find();

cursor[4];

for (var i = 0, len = c.length(); i < len; i++) printjson(c[i]);

var arr = db.users.find().toArray();

printjson(arr[2]);

db.users.find({age: {$lte: 28}}, {age: 1}).forEach(printjson);

db.users.find({age: {$lte: 28}}, {age: true}).forEach(printjson);

db.users.find({age: {$lte: 28}}, {age: false}).forEach(printjson);

db.things.find({x:4}).forEach(function(x) {print(tojson(x));});

db.getPrevError();

db.resetError();

show dbs

show collections

show users