spring mongodb增刪改查操做

添加數據

• 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> {
}

• 添加數據

School s1 = new School("淮陰工學院");
School s2 = new School("南京大學");
schoolRepository.save(s1);
schoolRepository.save(s2);

Student s1 = new Student("張三", new School(1));
Student s2 = new Student("李四", new School(1));
studentRepository.save(s1);
studentRepository.save(s2);

刪除數據

刪除一個學校試試？

schoolRepository.deleteById(1L);

刪除學校後，發現引用該學校的學生沒有被刪除

• 查詢學生試試看？

所以，須要本身來維護關係，若有須要，本身手動級聯刪除

查詢

使用基於接口的動態代理類- MongoRepository<>

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

• 分頁查詢

//建立匹配器，即如何使用查詢條件
ExampleMatcher matcher = ExampleMatcher.matching() //構建對象
        .withStringMatcher(ExampleMatcher.StringMatcher.CONTAINING) //改變默認字符串匹配方式：模糊查詢
        .withIgnoreCase(true) //改變默認大小寫忽略方式：忽略大小寫
        .withMatcher("articleTitle", ExampleMatcher.GenericPropertyMatchers.contains()); //採用「包含匹配」的方式查詢
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);

忽略大小寫

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

修改

• 使用mongoTempalte

// 條件
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);