spring mongodb增删改查操作

添加数据

• School

@Id
@GeneratedValue
private long id;
@Indexed(unique = true)
private String name;

• student

@Id
@Field("_id")
private String id;
private String name;
@DBRef
private School school;

• dao

public interface SchoolRepository extends MongoRepository<School, Long> {
}
public interface StudentRepository extends MongoRepository<Student, String> {
}

• 添加数据

School s1 = new School("淮阴工学院");
School s2 = new School("南京大学");
schoolRepository.save(s1);
schoolRepository.save(s2);

Student s1 = new Student("张三", new School(1));
Student s2 = new Student("李四", new School(1));
studentRepository.save(s1);
studentRepository.save(s2);

删除数据

删除一个学校试试？

schoolRepository.deleteById(1L);

删除学校后，发现引用该学校的学生没有被删除

• 查询学生试试看？

因此，需要自己来维护关系，如有需要，自己手动级联删除

查询

使用基于接口的动态代理类- MongoRepository<>

List<Outline> findOutlineByNameAndCourse(String name, Course course);

• 分页查询

//创建匹配器，即如何使用查询条件
ExampleMatcher matcher = ExampleMatcher.matching() //构建对象
        .withStringMatcher(ExampleMatcher.StringMatcher.CONTAINING) //改变默认字符串匹配方式：模糊查询
        .withIgnoreCase(true) //改变默认大小写忽略方式：忽略大小写
        .withMatcher("articleTitle", ExampleMatcher.GenericPropertyMatchers.contains()); //采用“包含匹配”的方式查询
Example<Article> example = Example.of(article, matcher);
Page<Article> data = articleRepository.findAll(example, page);

MongoDBTemplate

• Query

Pattern pattern = Pattern.compile("^.*" + key + ".*$", Pattern.CASE_INSENSITIVE);
Query query = Query.query(Criteria.where("name").regex(pattern).and("grade").is(new Grade(gradeId)));
query.limit(20);
List<Course> courses = mongo.find(query, Course.class);

忽略大小写

Criteria.where("name").regex("admin", "i")

修改

• 使用mongoTempalte

// 条件
Criteria where = Criteria.where("username").is("admin");
Query query = Query.query(where);
Update update = new Update();
update.set("username", "admin66");
UpdateResult upsert = mongoOperations.upsert(query, update, User.class);