Getting auto-generated key from row insertion in spring 3 / PostgreSQL 8.4.9

Question

I would like to retrieve the auto-generated id from a row insertion, but I get a NullPointerException

Here is the code :

long result = 0         


        

Answer 1

A solution using NamedParameterJdbcTemplate with Sequence.nextval :

        MapSqlParameterSource parameters = new MapSqlParameterSource();
        parameters.addValue("prenom", prenom);
        parameters.addValue("nom", nom);
        parameters.addValue("datenaissance", datenaissance);
        parameters.addValue("numtelephone", numtelephone);

    final String SQL = "INSERT INTO compte (idcompte,  prenom, nom, datenaissance, numtelephone) "
                        + " VALUES(compte_idcompte_seq.NEXTVAL, :prenom, :nom, :datenaissance, :numtelephone)";

        KeyHolder keyHolder = new GeneratedKeyHolder();
        NamedParameterJdbcTemplate namedJdbcTemplate = new NamedParameterJdbcTemplate(txManager.getDataSource());
        int nb = namedJdbcTemplate.update(SQL, parameters, keyHolder, new String[]{"idcompte"});
        Long generatedId = keyHolder.getKey().longValue();

I like this solution because with NamedParameterJdbcTemplate because the parameters are passed by name and the code is more readable and less prone to errors, especially when there are big queries.