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

setGeneratedKeysColumnNames(new String[]{"column_name"});

Don't forget to set the names for the auto-generated columns.

Answer 2

I faced the similar problem. I do not know why exactly I faced this problem but good thing is I got to resolve this by using below code:

final KeyHolder holder = new GeneratedKeyHolder();
int status = myTemplate.update(yourInsertSQL, namedParameters, holder, new String[]{"PrimaryKeyColumnName"});

Hope that helps someone.

Answer 3

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.

Answer 4

The easiest way to get a key back from an INSERT with Spring JDBC is to use the SimpleJdbcInsert class. You can see an example in the Spring Reference Guide, in the section titled Retrieving auto-generated keys using SimpleJdbcInsert.

Answer 5

There seems to be some known issues with Keyholder and PostgreSQL. Have a look at the workaround at this link Spring JDBC - Last inserted id

Also do check the database table directly to see if the record is inserted properly(i.e with PK). This will help to narrow down the problem.

Answer 6

I'm using Spring3.1 + PostgreSQL9.1, and when I use this

    KeyHolder keyHolder = new GeneratedKeyHolder();
    jdbcTemplate.update(new PreparedStatementCreator() {
        public PreparedStatement createPreparedStatement(Connection connection)
                throws SQLException {
            PreparedStatement ps = 
                connection.prepareStatement(youSQL, 
                    Statement.RETURN_GENERATED_KEYS);
            ps.setString(1, post.name_author);
            ...
            return ps;
        }
    }, keyHolder);
    long id = keyHolder.getKey().longValue();

I got this exception:

 org.springframework.dao.InvalidDataAccessApiUsageException: 
The getKey method should only be used when a single key is returned.  
The current key entry contains multiple keys: ...

So I changed to :

PreparedStatement ps = 
connection.prepareStatement(youSQL, new String[]{"id"});

where "id" is

id serial not null primary key

And the problem is solved. So I supposed that using

prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);

is not right here. The official guide is here, Chapter 13.2.8 :Retrieving auto-generated keys