Execute stored procedures with multiple parameters and map ResultSet to non-entity class using spring data jpa

Question

We moved to spring data JPA recently (using Spring-boot 2.1.5-RELEASE) and in need to execute stored procedures with multiple input parameters and map to the non-entity POJO (I will be setting the value to the entity class while saving the objects). Can anyone please provide an example/description on how can it be achieved? I didn't get much out of documentation or may be I missed.

Any help would be appreciated.

Answer 1

The most direct, and simplest solution is to user SimpleJDBCCall and forget about JPA for this data resource. The documentation covers parameters extensively.

Something like this will work:

public class MyDao implements SomeDao {

    private JdbcTemplate jdbcTemplate;
    private SimpleJdbcCall procReadStuff;

    public void setDataSource(DataSource dataSource) {
        this.jdbcTemplate = new JdbcTemplate(dataSource);
        this.procReadStuff = new SimpleJdbcCall(dataSource)
                .withProcedureName("my_procedure");
    }

    public void readStuff(Long id) {
        SqlParameterSource in = new MapSqlParameterSource()
                .addValue("in_id", id);
        Map out = procReadStuff.execute(in);
        Stuff stuff = new Stuff();
        stuff.setId(id);
        stuff.setSomeString((String) out.get("out_some_string"));

        // ...do something with Stuff POJO
    }

}

This sample was pulled/modified from the sample in the docs: Documentation