@Override
  protected void insertNullDataForAllSupportedFieldsTable(MemberVM dataserver, String key,
      String tableName) {
    String finalUrl = getConnectionUrl();
    dataserver.invoke(() -> {
      Connection connection = DriverManager.getConnection(finalUrl);
      DatabaseMetaData metaData = connection.getMetaData();
      String quote = metaData.getIdentifierQuoteString();

      String insertQuery =
          "Insert into " + quote + tableName + quote + " values (" + "?,?,?,?,?,?,?,?,?,?,?,?,?)";
      System.out.println("### Query is :" + insertQuery);
      PreparedStatement statement = connection.prepareStatement(insertQuery);
      createNullStatement(key, statement);

      statement.execute();
    });
  }
End-to-end dunits for jdbc connector
geode-connectors/src/acceptanceTest/java/org/apache/geode/connectors/jdbc/PostgresJdbcDistributedTest.java