code: public int deleteByTableName(String tableName) throws SQLException {
  		DeleteBuilder<ContentsId, Long> db = deleteBuilder();
  		db.where().eq(ContentsId.COLUMN_TABLE_NAME, tableName);
  		PreparedDelete<ContentsId> deleteQuery = db.prepare();
  		int deleted = delete(deleteQuery);
  		return deleted;
  	}
docs: Delete by table name
  
  @param tableName
  table name
  @return rows deleted
  @throws SQLException
  upon failure