Mybatis-注解开发

目录

介绍

注解实现查询操作步骤

实例演示

注解实现新增操作步骤

实例演示

注解实现修改操作步骤

实例演示

注解实现删除操作步骤

实例演示

介绍

注解实现查询操作步骤

实例演示

public class Student {
    private Integer id;
    private String name;
    private Integer age;
 
    public Student() {
    }
 
    public Student(Integer id, String name, Integer age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
 
    public Integer getId() {
        return id;
    }
 
    public void setId(Integer id) {
        this.id = id;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public Integer getAge() {
        return age;
    }
 
    public void setAge(Integer age) {
        this.age = age;
    }
 
    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

//查询全部
    @Select("SELECT * FROM student")
    public abstract List selectAll();

<package name="demo5.mapper"/>

@Test
    public void selectAll() throws Exception{
        //1.加载核心配置文件
        InputStream is = Resources.getResourceAsStream("MybatisConfig.xml");
        //2.获取SqlSession工厂对象
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        //3.通过工厂对象获取SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        //4.获取StudentMapper接口的实现类对象
        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
        //5.调用实现类的方法，接收结果
        List list = mapper.selectAll();
        //6.处理结果
        for (Student student : list) {
            System.out.println(student);
        }
        //7.释放资源
        sqlSession.close();
        is.close();
    }

注解实现新增操作步骤

实例演示

//新增操作
    @Insert("INSERT INTO student VALUES (#{id},#{name},#{age})")
    public abstract Integer insert(Student stu);

@Test
    public void insert() throws Exception{
        //1.加载核心配置文件
        InputStream is = Resources.getResourceAsStream("MybatisConfig.xml");
        //2.获取SqlSession工厂对象
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        //3.通过工厂对象获取SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        //4.获取StudentMapper接口的实现类对象
        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
        //5.调用实现类的方法，接收结果
        Student stu = new Student(5,"倪七",26);
        Integer result = mapper.insert(stu);
        //6.处理结果
        System.out.println(result);
        //7.释放资源
        sqlSession.close();
        is.close();
    }

注解实现修改操作步骤

实例演示

//修改操作
    @Update("UPDATE student SET name=#{name},age=#{age} WHERE id=#{id}")
    public abstract Integer update(Student stu);

@Test
    public void update() throws Exception{
        //1.加载核心配置文件
        InputStream is = Resources.getResourceAsStream("MybatisConfig.xml");
        //2.获取SqlSession工厂对象
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        //3.通过工厂对象获取SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        //4.获取StudentMapper接口的实现类对象
        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
        //5.调用实现类的方法，接收结果
        Student stu = new Student(5,"倪九",99);
        Integer result = mapper.update(stu);
        //6.处理结果
        System.out.println(result);
        //7.释放资源
        sqlSession.close();
        is.close();
    }

注解实现删除操作步骤

实例演示

//删除操作
    @Delete("DELETE FROM student WHERE id=#{id}")
    public abstract Integer delete(Integer id);

@Test
    public void delete() throws Exception{
        //1.加载核心配置文件
        InputStream is = Resources.getResourceAsStream("MybatisConfig.xml");
        //2.获取SqlSession工厂对象
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        //3.通过工厂对象获取SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        //4.获取StudentMapper接口的实现类对象
        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
        //5.调用实现类的方法，接收结果
        Integer result = mapper.delete(5);
        //6.处理结果
        System.out.println(result);
        //7.释放资源
        sqlSession.close();
        is.close();
    }