Is there a way to override JPA saveAll method to used customized UPSERT query? - spring-boot

Question

I am trying to override the JpaRepository saveAll method to use the custom UPSERT query in java SpringBoot. Is it possible?

Answer 1

As it's only one repository you can create a custom repository like this. I assume that the Entity name is User:
Your interface with only this saveAll Method
interface CustomizedUserRepository {
void savAllWithUpsert(Iterator<User> entities);
}
Then you have to implement the interface
class CustomizedUserRepositoryImpl implements CustomizedUserRepository {
public void savAllWithUpsert(Iterator<User> entities) {
// Your custom implementation
}
}
The most important part of the class name that corresponds to the fragment interface is the Impl postfix.
And finally use but all together:
interface UserRepository extends JpaRepository<User, Long>, CustomizedUserRepository {
}
Please also read the full docuementaion: https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories.single-repository-behavior

Answer 2

I used JdbcTemplate (NamedParameterJdbcTemplate)
//Bean
#Bean
public NamedParameterJdbcTemplate namedParameterJdbcTemplate() {
JdbcTemplate template = new JdbcTemplate(hikariDataSource);
template.setQueryTimeout(Integer.parseInt(queryTimeout));
return new NamedParameterJdbcTemplate(template);
}
Then
//Autowire NamedParameterJdbcTemplate
MapSqlParameterSource[] paramsArray =
mapperClass.mapDTOstoSqlParameterSource(items);
namedParameterJdbcTemplate.batchUpdate(SQL_qUERY, paramsArray);
Then
//Mapper class
public static MapSqlParameterSource[]
mapDTOstoSqlParameterSource(List<ItemDTO> items) {
List<MapSqlParameterSource> params = new ArrayList<>();
for (ItemDTO obj : items) {
MapSqlParameterSource source = new MapSqlParameterSource();
source.addValue("queryPara1", obj.getID());
source.addValue("queryPara2", obj.getSomething());
params.add(source);
}
return params.toArray(MapSqlParameterSource[]::new);
}