jdbc with spring

jdbc-spring.java

import java.sql.Timestamp;
import java.sql.Types;
import java.util.Arrays;
import java.util.Date;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.PreparedStatementCreator;
import org.springframework.jdbc.core.PreparedStatementCreatorFactory;
import org.springframework.jdbc.support.GeneratedKeyHolder;
import org.springframework.jdbc.support.KeyHolder;
import org.springframework.stereotype.Repository;

import tacos.Ingredient;
import tacos.Taco;

@Repository
public class JdbcTacoRepository implements TacoRepository {
 private JdbcTemplate jdbc;
 public JdbcTacoRepository(JdbcTemplate jdbc) {
 this.jdbc = jdbc;
 }
 @Override
 public Taco save(Taco taco) {
 long tacoId = saveTacoInfo(taco);
 taco.setId(tacoId);
 for (Ingredient ingredient : taco.getIngredients()) {
 saveIngredientToTaco(ingredient, tacoId);
 }
 return taco;
 }
 private long saveTacoInfo(Taco taco) {
 taco.setCreatedAt(new Date());
 PreparedStatementCreator psc =
 new PreparedStatementCreatorFactory(
 "insert into Taco (name, createdAt) values (?, ?)",
 Types.VARCHAR, Types.TIMESTAMP
 ).newPreparedStatementCreator(
 Arrays.asList(
 taco.getName(),
 new Timestamp(taco.getCreatedAt().getTime())));
 KeyHolder keyHolder = new GeneratedKeyHolder();
 jdbc.update(psc, keyHolder);
 return keyHolder.getKey().longValue();
 }
 private void saveIngredientToTaco(
 Ingredient ingredient, long tacoId) {
 jdbc.update(
 "insert into Taco_Ingredients (taco, ingredient) " +
 "values (?, ?)",
 tacoId, ingredient.getId());
 }
}