The MongoDBBasicDBObjectput method fails, the reason for the put Value failure and the Solution

The MongoDBBasicDBObjectput method fails. The reason for the put Value failure and the solution BasicDBObjectobjnewBasicDBObject (); obj. put (key, value); the error occurs because the key is unique. If the key is the same, it overwrites the previous www.2cto.com, for example, obj. put (a, 1); obj. put (B, 2); obj. put (c

MongoDB BasicDBObject put method failed. Cause of put Value failure and solution BasicDBObject obj = new BasicDBObject (); obj. put (key, value); the error occurs because the key is unique. If the key is the same, it overwrites the previous www.2cto.com, for example, obj. put (a, 1); obj. put (B, 2); obj. put (c

MongoDB BasicDBObject put method failure, reason of put Value failure and Solution

BasicDBObject obj = new BasicDBObject ();

Obj. put (key, value );

The error occurs because the key is unique.

If the key is the same, it overwrites the previous

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For example:

Obj. put ("a", 1 );

Obj. put ("B", 2 );

Obj. put ("c", 3 );

Obj. put ("a", 5 );

After execution, only

Obj. put ("B", 2 );

Obj. put ("c", 3 );

Obj. put ("a", 5); // overwrite the previous obj. put ("a", 1); because the keyword ""