DbDelete delete a message from db.

DbDeleteReturn delete a message from db and return the deleted message.

DbInsert insert a message to db.

DbInsertReturn insert a message to db and return the inserted message.

DbInsertWithTableName insert a message to db with table name.

DbInsertWithTableNameReturn insert a message to db with table name and return the inserted message.

DbScan2ProtoMsg scan db rows to proto message, the proto msg has no nested message.

DbUpdate update a message in db.

DbUpdateReturn update a message in db and return the updated message.