computer-web/src/main/java/example/dao/ComputerDao.java

package example.dao;

import example.model.Computer;
import example.utils.DBUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import java.sql.SQLException;
import java.util.List;

public class ComputerDao {
    private final QueryRunner queryRunner = new QueryRunner(DBUtils.getDataSource());

    public int addComputer(String name, Double price, int stock) {
        String sql = "insert into computer(name, price, stock) values(?, ?, ?)";
        try {
            return queryRunner.update(sql, name, price, stock);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return 0;
    }

    public int updateComputer(String name, Double price, int stock, int id) {
        String sql = "update computer set name=?, price=?, stock=? where id=?";
        try {
            return queryRunner.update(sql, name, price, stock, id);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return 0;
    }

    public void deleteComputer(int id) {
        String sql = "delete from computer where id=?";
        try {
            queryRunner.update(sql, id);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public List<Computer> getAllComputer() throws SQLException {
        String sql = "select * from computer";
        return queryRunner.query(sql,new BeanListHandler<>(Computer.class));
    }


    public Computer getComputerById(int i) {
        String sql = "select * from computer where id=?";
        try {
            return queryRunner.query(sql, new BeanHandler<>(Computer.class), i);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}