code: public boolean existsTable(String tableName) throws SQLException {
          Connection connection = null;
          try {
              DTXLocalContext.makeUnProxy();
              connection = dataSource.getConnection();
              connection.setAutoCommit(true);
              return existsTable(connection, tableName);
          } finally {
              DbUtils.close(connection);
              DTXLocalContext.undoProxyStatus();
          }
      }
docs: 存在数据表判断
  
  @param tableName tableName
  @return exists
  @throws  SQLException SQLException