code: public boolean deleteById(String tableName, Object idValue) {
  		return deleteByIds(tableName, config.dialect.getDefaultPrimaryKey(), idValue);
  	}
docs: Delete record by id with default primary key.
  <pre>
  Example:
  Db.use().deleteById("user", 15);
  </pre>
  @param tableName the table name of the table
  @param idValue the id value of the record
  @return true if delete succeed otherwise false