Mybatsi注解开发-基础操作

1.导入坐标

<dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>3.7.5</version>
    </dependency>
    <dependency>
<!--      解析器-->
      <groupId>com.github.jsqlparser</groupId>
      <artifactId>jsqlparser</artifactId>
      <version>0.9.1</version>
    </dependency>

2.创建实体类User

public class User {

    private int id;
    private String username;
    private String password;
    private Date birthday;

    public Date getBirthday() {
        return birthday;
    }

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

    public int getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

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

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

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

3.创建UserMapper（dao）接口

public interface UserMapper {

    @Insert("insert into user values(#{id},#{username},#{password},#{birthday})")
    public void save(User user);

    @Update("update user set  username=#{username},password=#{password},birthday=#{birthday} where id=#{id}")
    public void update(User user);

    @Delete("delete from user where id=#{id}")
    public void delete(int id);

    @Select("select * from user where id=#{id}")
    public User findById(int id);

    @Select("select * from user")
    public List<User> findAll();

}

4.配置Mybatis核心配置文件SqlMapConfig.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!--    加载jdbc.properties配置文件-->
    <properties resource="jdbc.properties"/>

<!--    定义别名-->
    <typeAliases>
        <typeAlias type="com.hao.domain.User" alias="user"/>
    </typeAliases>

    <!--    配置数据源环境-->
    <environments default="development"><!-- 表示默认情况下使用id为development的环境-->
        <environment id="development">
            <transactionManager type="JDBC"></transactionManager>
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>

<!--    加载映射关系-->
    <mappers>
<!--        指定接口所在的包-->
        <package name="com.hao.mapper"/>
    </mappers>
</configuration>

5.测试

public class MapperTest {

    private UserMapper userMapper;
    @Before
    public void before() throws IOException {
        InputStream stream = Resources.getResourceAsStream("SqlMapConfig.xml");
        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(stream);
        SqlSession sqlSession = build.openSession(true);
        userMapper = sqlSession.getMapper(UserMapper.class);
    }
    @Test
    public void testSave(){
        User user=new User();
        user.setUsername("tom");
        user.setPassword("123");
        userMapper.save(user);
    }
    @Test
    public void testUpdate(){
        User user = new User();
        user.setId(2);
        user.setUsername("dou");
        user.setPassword("bi");
        userMapper.update(user);
    }
    @Test
    public void testDelete(){
        User user = new User();
        userMapper.delete(3);
    }
    @Test
    public void testFindById(){
        User user=userMapper.findById(2);
        System.out.println(user);
    }
    @Test
    public void testFindAll(){
        List<User> list = userMapper.findAll();
        for (User user : list) {
            System.out.println(user);
        }
    }
}

6.结果