How do you map the output of a Spring stored procedure execute? - spring

Question

I am using Spring and stored procedures to retrieve data from a mySQL database. I have the stored procedure and parameters working OK but I'm having problems mapping the result set. At the moment I have some truly ugly code to get the values and I'm sure there has to be a better, cleaner and more elegant way. Can anyone guide me to a better solution?
After the stored procedure class, I have:
List<String> outList = new ArrayList<String>();
Map<String,Object> outMap = execute(parameters_map);
List list = (List) outMap.get("#result-set-1");
for (Object object : list) {
Map map2 = (Map) object;
list.add(map2.get("runname"));
}
return outList;
runname is the column from the database query.
Is there a better way to achieve this?

Answer 1

Example from spring docs using RowMapper:
public class JdbcActorDao implements ActorDao {
private SimpleJdbcCall procReadAllActors;
public void setDataSource(DataSource dataSource) {
JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
jdbcTemplate.setResultsMapCaseInsensitive(true);
this.procReadAllActors = new SimpleJdbcCall(jdbcTemplate)
.withProcedureName("read_all_actors")
.returningResultSet("actors",
BeanPropertyRowMapper.newInstance(Actor.class));
}
public List getActorsList() {
Map m = procReadAllActors.execute(new HashMap<String, Object>(0));
return (List) m.get("actors");
}
// ... additional methods
}

Answer 2

took a while to interpret the Spring docs but I finally got there.
My solution:
SimpleJdbcCall simpleJdbcCall = new SimpleJdbcCall(jdbcTemplate)
.withProcedureName("DistinctRunNames")
.withoutProcedureColumnMetaDataAccess();
simpleJdbcCall.addDeclaredParameter(new SqlParameter("environment", Types.VARCHAR));
simpleJdbcCall.addDeclaredParameter(new SqlParameter("username", Types.VARCHAR));
simpleJdbcCall.addDeclaredParameter(new SqlParameter("test_suite", Types.VARCHAR));
SqlParameterSource parameters = new MapSqlParameterSource().addValue("environment", environment)
.addValue("username", username).addValue("test_suite", testSuite);
Map map = simpleJdbcCall.returningResultSet("runnames", new ParameterizedRowMapper<RunNameBean>() {
public RunNameBean mapRow(ResultSet rs, int rowNum) throws SQLException {
RunNameBean runNameBean = new RunNameBean();
runNameBean.setName(rs.getString("runname"));
return runNameBean;
}
}).execute(parameters);
return (List) map.get("runnames");
Had problems with expected parameters versus actual, had to break up the simpleJdbcCall object. Maps the results into a list beautifully.
Thank you for answers, helped me to learn about Spring mapping.