How to call a custom Oracle function returning a value from JPA

Question

I have a custom function in oracle returning a number after deleting records. I could get a value in sql_plus such as

call my_function(4) into :out_number;
<         


        

Answer 1

When using Spring Data JPA / Spring JDBC you can use SimpleJdbcCall for calling functions and procedures.

For such function header:

FUNCTION get_text (p_param IN VARCHAR2) RETURN VARCHAR2

Use this call:

import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.SqlParameterSource;
import org.springframework.jdbc.core.simple.SimpleJdbcCall;
import org.springframework.stereotype.Repository;

@Repository
public class MyRepository {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Override
    public String callGetTextFunction(String param) {
        SimpleJdbcCall jdbcCall = new SimpleJdbcCall(jdbcTemplate)
                .withCatalogName("PKG_PACKAGE") //package name
                .withFunctionName("GET_TEXT"); //function name
        SqlParameterSource paramMap = new MapSqlParameterSource()
                .addValue("p_param", param));
        //First parameter is function output parameter type.
        return jdbcCall.executeFunction(String.class, paramMap));
    }

}