JDBC Template

1,

package tacos.data;

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());
    }

}