Mybatis通過註解實現基本的CRUD

User

package com.itheima.domain;

import java.io.Serializable;
import java.util.Date;
import java.util.List;

public class User implements Serializable {
    private static final long serialVersionUID = 2L;//UID
    private Integer id;//用戶id
    private String username;//用戶名
    private Date birthday;//用戶出生日期
    private String sex;//用戶性別
    private  String address;//用戶地址

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", birthday=" + birthday +
                ", sex='" + sex + '\'' +
                ", address='" + address + '\'' +
                '}';
    }
}

UserDao

package com.itheima.dao;

import com.itheima.domain.User;
import org.apache.ibatis.annotations.*;

import java.util.List;

public interface UserDao {
    /**
     * 查詢所有用戶信息
     * @return
     */
    @Select("select * from user")
    @Results(id="userMap",
               value ={@Result(id=true,column = "id",property = "id"),
                       @Result(column = "username",property = "username"),
                       @Result(column = "birthday",property = "birthday"),
                       @Result(column = "address" ,property = "address"),
                       @Result(column = "sex",property = "sex")
                } )
    public List<User> findAll();

    /**
     * 根據id查詢用戶信息
     * @param id
     * @return
     */
    @Select("select * from user where id = #{id}")
    public User findById(int id);

    /**
     * 聚合函數查詢用戶數量
     * @return
     */
    @Select("select count(*) from user")
    public int findCount();

    /**
     * 添加用戶
     * @param user
     */
    @Insert("insert into user(username,birthday,address,sex)" +
            " value(#{username},#{birthday},#{address},#{sex})")
    @SelectKey(keyColumn = "id",keyProperty = "id",resultType = Integer.class ,before = false,
    statement = {"select last_insert_id()"})
    public void addUser(User user);

    /**
     * 修改用戶信息
     * @param user
     */
    @Update("update user set username=#{username},birthday=#{birthday},address=#{address},sex=#{sex} where id = #{id}")
    public void updateUser(User user);

    /**
     * 通過id刪除用戶信息
     * @param id
     */
    @Delete("delete from user where id = #{id}")
    public void deleUser(int id);
}

Test

package com.itheima.test;

import com.itheima.dao.UserDao;
import com.itheima.domain.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.List;

public class MybatisTest {

    private InputStream in;
    private SqlSessionFactory factory;
    private SqlSession session;
    private UserDao userDao;


    /**
     * 初始化獲取代理對象
     * @throws IOException
     */
    @Before
    public void init() throws IOException {
        //1.讀取配置文件
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.創建SqlSessionFactory工廠
        SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
        factory = builder.build(in);
        //3.使用工廠生產SqlSession對象
        session = factory.openSession();
        //4.使用SqlSession創建Dao接口的代理對象
        userDao = session.getMapper(UserDao.class);
    }

    /**
     * 釋放資源
     */
    @After
    public void destory() throws IOException {
        //事務回滾
        session.commit();
        session.close();
        in.close();
    }
    /**
     * 入門案例
     * @param
     */
    @Test
    public void findAllTest() {
        List<User> userDaoAll = userDao.findAll();
        for (User user : userDaoAll) {
            System.out.println(user);
        }
    }

    @Test
    public void findByIdTest(){
        int id = 41;
        User user = userDao.findById(id);
        System.out.println(user);
    }

    @Test

    public void findCountTest(){
        int count = userDao.findCount();
        System.out.println(count);
    }

    @Test
    public void addUserTest(){
        User user = new User();
        user.setUsername("呵呵");
        user.setBirthday(new Date());
        user.setAddress("addUserTest");
        user.setSex("男");

        userDao.addUser(user);
        System.out.println(user.getId());
    }

    @Test
    public void deletUserTest(){
        int id = 42;
        userDao.deleUser(id);
    }

    @Test
    public void updateUserTest(){
        User user = userDao.findById(43);
        user.setUsername("upadaeUserTest");
        userDao.updateUser(user);
    }


}