2. MongoDB Common Commands

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Database common commands 1, help view command prompt   help  db.help ();  db.yourColl.help ();  db.youColl.find (). Help ();  Rs.help (); 2. switch/CREATE DATABASE  use yourdb;   when a collection (table) is created, the current database 3 is automatically created, all databases are queried  show dbs;4, and the currently used database is deleted  db.dropdatabase (); 5. Clone the database from the specified host  db.clonedatabase ("127.0.0.1"); Cloning data from the database on the specified machine to the current database 6, copying the specified database data from the specified machine to a database  db.copydatabase ("MyDB", "temp", "127.0.0.1"); Copy the MyDB data from the native to the temp database 7, fix the current database  db.repairdatabase (), 8, view the currently used database  db.getname (); db; The DB and GetName methods are the same effect, can query the currently used database 9, display the current DB status  db.stats (), 10, the current DB version  db.version (), 11, view the current DB link machine address   Db.getmongo ();  collection gather collection 1, create a clustered collection (table)  db.createcollection ("Collname", {size:20, capped:5, Max: 100}); 2, the Aggregation set (table)  db.getcollection ("account") that gets the specified name, 3, gets all the aggregation sets of the current DB  db.getcollectionnames (); 4, Displays the status of all clustered indexes in the current DB  db.printcollectionstats ();   user-related 1, adding a user  db.adduser ("name");  Db.adduser ("UserName", "pwd123", true); Add users, set passwords, read-only 2, database authentication, security mode  db.Auth ("UserName", "123123"); 3, display all current user  show users;4, delete user  db.removeuser ("userName");  other 1, error message before query  db.getpreverror (); 2, clear error logging  db.reseterror (); 

2. MongoDB Common Commands