Retrieving customized auto-generated keys with Spring JDBC Template

Question

I am required to retrieve customized auto-generated key using spring jdbc template after insertion of a record.

insert into CREDIT(CREDITID,PROFILEID,CLIENTID,EVENTID,CREDIT_HEADING,CREDIT_DESCRIPTION,CREDIT_IMAGE,TESTIMONIAL,TESTIMONIAL_PROVIDER) values('CRE'||CREDITID_SEQ.nextVal,:profileId,:clientId,:eventId,:creditHeading,:creditDescription,:creditImage,:testimonial,:provider)

If you see i am using a sequence.nextVal prefixed with "CRE" as primary key value. The purpose is to have keys like CRE1, CRE2,CRE3....CREn . I wish to retrieve it using spring jdbc template. Here is the code i have written but it throws an exception.

  public String insertCredit(final Credit credit) throws SQLException {


                final String insertQuery = dbUtil.getQuery("crms.credit.insert");
                SqlParameterSource creditParameters = new BeanPropertySqlParameterSource(credit);
                GeneratedKeyHolder keyHolder = new GeneratedKeyHolder();
                NamedParameterJdbcTemplate namedParamJdbcTemplate = new NamedParameterJdbcTemplate(dataSource);
                namedParamJdbcTemplate.update(insertQuery, creditParameters, keyHolder, new String[]{"CREDITID"});
                String creditId = keyHolder.getKey().toString();

    return creditId;
    } 

The record is perfectly inserted into the database. following exception is thrown

org.springframework.dao.DataRetrievalFailureException: The generated key is not of a supported numeric type. Unable to cast [java.lang.String] to [java.lang.Number]
    at org.springframework.jdbc.support.GeneratedKeyHolder.getKey(GeneratedKeyHolder.java:73)
    at com.bluebench.mediamanager.cmn.dao.crms.CreditDAO.insertCredit(CreditDAO.java:72)
    at com.bluebench.mediamanager.crms.service.CredentialManagementService.addCredit(CredentialManagementService.java:56)
    at com.bluebench.mediamanager.crms.controller.CredentialManagementController.addCredits(CredentialManagementController.java:59)

Is there a way to retrieve the primary key value ?

Answer 1

Here is the solution, instead of using

String creditId = keyHolder.getKey().toString();

We should use

String creditId = (String) keyHolder.getKeys().get("CREDITID");

the actual hint came from Mr. Unknown. I cannot accept your answer since its not correct but thanks for hinting a different direction.