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

package example.dao;

import example.model.User;
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.util.List;

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

    public int addUser(String username, String phone,String password) throws Exception {
        String sql = "INSERT INTO user (username,phone, password,admin) VALUES (?, ?,?,?)";
        return queryRunner.update(sql, username, phone,password,0);
    }

    public User getUserById(int id) throws Exception {
        String sql = "SELECT * FROM user WHERE id = ?";
        return queryRunner.query(sql, new BeanHandler<>(User.class), id);
    }

    public User getUserByUsername(String username) throws Exception {
        String sql = "SELECT * FROM user WHERE username = ?";
        return queryRunner.query(sql, new BeanHandler<>(User.class), username);
    }

    public List<User> getAllUser() throws Exception {
        String sql = "SELECT * FROM user";
        return queryRunner.query(sql, new BeanListHandler<>(User.class));
    }

    public int updateUser(int id, String name, String email) throws Exception {
        String sql = "UPDATE user SET username = ?, password = ? WHERE id = ?";
        return queryRunner.update(sql, name, email, id);
    }

    public int deleteUser(int id) throws Exception {
        String sql = "DELETE FROM user WHERE id = ?";
        return queryRunner.update(sql, id);
    }

    public static void main(String[] args) throws Exception {
        UserDao userDao = new UserDao();
        System.out.println(userDao.getUserById(1).getUsername());
    }

}