What is a solution of “Multiple ResultSets were returned by the query”

问题

I get error:

ERROR [NewsDAO] findAll(): org.postgresql.util.PSQLException: Multiple ResultSets were returned by the query.

Im using postgresql-8.4-703.jdbc4.jar.

My code looks like:

private static StringBuilder findAllQuery = new StringBuilder();

    {
    findAllQuery.append("SELECT * FROM news;");
}

    public List<News> findAll() {
    Statement stm = null;
    ResultSet rs = null;

    List<News> results = new ArrayList<News>();
    if (obtainConnection()) {
        try {
            stm = con.createStatement();
            rs = stm.executeQuery(findAllQuery.toString());
            while(rs.next())
                results.add(setInObject(rs));
        } catch (Exception e) {
            logger.error("findAll(): " + e);
        } finally {
            logger.info("Zamknalem");
            closeConnection();
        }
    }
    return results;
}
    public News setInObject(ResultSet rs) throws SQLException {
    News news = new News();
    news.setId(rs.getInt("id"));
    news.setTitle(rs.getString("title"));
    news.setDescription(rs.getString("description"));
    //TODO: timestamp
    news.setDate(rs.getDate("date"));
    User user = new User();
    user.setId(rs.getInt("user_id"));
    news.setUser(user);
    news.setActive(rs.getBoolean("active"));
    return news;
}

I don't know why i get this error. Any ideas?

回答1:

You must have multiple select statements in findAllQuery.toString().

Edit

As JB Nizet pointed out, you should try removing the semicolon from the statement. The Postgresql JDBC driver splits statements on the semicolon, so it may be issuing two statements.

来源：https://stackoverflow.com/questions/10515260/what-is-a-solution-of-multiple-resultsets-were-returned-by-the-query