pgpreparedstatement.java

  public ResultSetMetaData getMetaData() throws SQLException {
    checkClosed();
    ResultSet rs = getResultSet();

    if (rs == null || ((PgResultSet) rs).isResultSetClosed()) {
      // OK, we haven't executed it yet, or it was closed
      // we've got to go to the backend
      // for more info. We send the full query, but just don't
      // execute it.

      int flags = QueryExecutor.QUERY_ONESHOT | QueryExecutor.QUERY_DESCRIBE_ONLY
          | QueryExecutor.QUERY_SUPPRESS_BEGIN;
      StatementResultHandler handler = new StatementResultHandler();
      connection.getQueryExecutor().execute(preparedQuery.query, preparedParameters, handler, 0, 0,
          flags);
      ResultWrapper wrapper = handler.getResults();
      if (wrapper != null) {
        rs = wrapper.getResultSet();
      }
    }

    if (rs != null) {
      return rs.getMetaData();
    }

    return null;
  }