names.Mapper for all naming is the best choice. But if table or column is not in rule, we need new method to archive.
If struct or pointer of struct has
TableName() string method, the return value will be the struct’s table name.
engine.Table() can change the database table name for struct. The struct tag
xorm:"'column_name'" can set column name for struct field. Use a pair of single quotes to prevent confusion for column’s definition in struct tag. If there is no risk of confusion, ignore single quotes.