JavaBean转化

[aSingleDragon]

该Pull Request关联的Issue

修改描述

在使用mapper的selectList方法时，查询一个宽表或者查询的字段占据表总字段数比例较低时，应该用select(Student::getName, Student::getAge)来选择需要的字段。查询出来的实体Bean在分层架构中直接透穿是不安全的，不便理解的，效率较低。此时需要将Bean进行转换成目标Bean。

测试用例

` @TestMethodOrder(MethodOrderer.OrderAnnotation.class) @ExtendWith(SpringExtension.class) @ContextConfiguration(locations = {"classpath:h2/spring-test-h2.xml"}) class H2UserMapperTest extends BaseTest {

@Test
void testSelectAndConvert() {
    List<H2User> h2Users = userMapper.selectList(new LambdaQueryWrapper<H2User>()
        .select(H2User::getTestId, H2User::getAge));
    List<H2Student> h2Students = userMapper.selectAndConvertList(new LambdaQueryWrapper<H2User>()
        .select(H2User::getTestId, H2User::getAge), H2Student.class);
    for (int i = 0; i < h2Students.size(); i++) {
        H2User h2User = h2Users.get(i);
        H2Student h2Student = h2Students.get(i);
        Assertions.assertEquals(h2Student.getName(), h2User.getName());
    }
}

} class BeanConvertUtilsTest {

@Test
void testConvert() {
    List<Student> studentList = new ArrayList<>();
    Student student = new Student();
    student.setAge(17);
    student.setName("hll");
    student.setGender(true);
    student.setGrade((byte) 99);
    studentList.add(student);
    List<Teacher> teacherList = BeanConvertUtils.convert(studentList, Teacher.class);
    for (int i = 0; i < teacherList.size(); i++) {
        Teacher t = teacherList.get(i);
        Student s = studentList.get(i);
        Assertions.assertEquals(s.getAge(), t.getAge());
        Assertions.assertEquals(s.getName(), t.getName());
        Assertions.assertEquals(s.isGender(), t.isGender());
    }
}

@Data
public static class Man {

    private String home;

}

@Data
public static class Student {

    private static final Integer no = 12;

    private byte grade;

    private int age;

    private String name;

    private boolean gender;

    private Integer salary;
}

@Data
public static class Teacher {

    private Integer age;

    private String name;

    private boolean gender;

    private String clazz;

    private int salary;
}

}`

修复效果的截屏

[miemieYaho]

这种你留着自己项目里用就行了,mp只需要管大方向