code: public Record findById(String tableName, Object idValue) {
  		return findByIds(tableName, config.dialect.getDefaultPrimaryKey(), idValue);
  	}
docs: Find record by id with default primary key.
  <pre>
  Example:
  Record user = Db.use().findById("user", 15);
  </pre>
  @param tableName the table name of the table
  @param idValue the id value of the record