springboot整合mongodb （MongoTemplate 和MongoRepository）

引入依赖

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-mongodb</artifactId>
    </dependency>

在application.properties文件添加配置

spring.data.mongodb.uri=mongodb://localhost:27017/test

MongoTemplate 

常用方法
mongoTemplate.findAll(User.class): 查询User文档的全部数据
mongoTemplate.findById(<id>, User.class): 查询User文档id为id的数据
mongoTemplate.find(query, User.class);: 根据query内的查询条件查询
mongoTemplate.upsert(query, update, User.class): 修改
mongoTemplate.remove(query, User.class): 删除
mongoTemplate.insert(User): 新增

Query对象
1、创建一个query对象（用来封装所有条件对象)，再创建一个criteria对象（用来构建条件）
2、 精准条件：criteria.and(“key”).is(“条件”)
模糊条件：criteria.and(“key”).regex(“条件”)
3、封装条件：query.addCriteria(criteria)
4、大于（创建新的criteria）：Criteria gt = Criteria.where(“key”).gt（“条件”）
小于（创建新的criteria）：Criteria lt = Criteria.where(“key”).lt（“条件”）
5、Query.addCriteria(new Criteria().andOperator(gt,lt));
6、一个query中只能有一个andOperator()。其参数也可以是Criteria数组。
7、排序 ：query.with（new Sort(Sort.Direction.ASC, "age"). and(new Sort(Sort.Direction.DESC, "date")))

添加User类

@Data
@Document("User")// 对应表和集合
public class User {

 @Id
 private String id;
 private String name;
 private Integer age;
 private String email;
 private String createDate;
}

    //添加
    @Test
    public void createUser() {
        User user = new User();
        user.setAge(20);
        user.setName("test");
        user.setEmail("4932200@qq.com");
        User user1 = mongoTemplate.insert(user);
        System.out.println(user1);
    }

    //查询所有
    @Test
    public void findUser() {
        List<User> userList = mongoTemplate.findAll(User.class);
        System.out.println(userList);
    }

    //根据id查询
    @Test
    public void getById() {
        User user = 
mongoTemplate.findById("5ffbfa2ac290f356edf9b5aa", User.class);
        System.out.println(user);
    }

    //条件查询
    @Test
    public void findUserList() {
        Query query = new Query(Criteria
                .where("name").is("test")
                .and("age").is(20));
        List<User> userList = mongoTemplate.find(query, User.class);
        System.out.println(userList);
    }

    //模糊查询
    @Test
    public void findUsersLikeName() {
        String name = "est";
        String regex = String.format("%s%s%s", "^.*", name, ".*$");
        Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
        Query query = new Query(Criteria.where("name").regex(pattern));
        List<User> userList = mongoTemplate.find(query, User.class);
        System.out.println(userList);
    }

    //分页查询
    @Test
    public void findUsersPage() {
        String name = "est";
        int pageNo = 1;
        int pageSize = 10;

        Query query = new Query();
        String regex = String.format("%s%s%s", "^.*", name, ".*$");
        Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
        query.addCriteria(Criteria.where("name").regex(pattern));
        int totalCount = (int) mongoTemplate.count(query, User.class);
        List<User> userList = mongoTemplate.find(query.skip((pageNo - 1) * pageSize).limit(pageSize), User.class);

        Map<String, Object> pageMap = new HashMap<>();
        pageMap.put("list", userList);
        pageMap.put("totalCount",totalCount);
        System.out.println(pageMap);
    }

    //修改
    @Test
    public void updateUser() {
        User user = mongoTemplate.findById("5ffbfa2ac290f356edf9b5aa", User.class);
        user.setName("test_1");
        user.setAge(25);
        user.setEmail("493220990@qq.com");
        Query query = new Query(Criteria.where("_id").is(user.getId()));
        Update update = new Update();
        update.set("name", user.getName());
        update.set("age", user.getAge());
        update.set("email", user.getEmail());
        UpdateResult result = mongoTemplate.upsert(query, update, User.class);
        long count = result.getModifiedCount();
        System.out.println(count);
    }

    //删除操作
    @Test
    public void delete() {
        Query query = 
new Query(Criteria.where("_id").is("5ffbfa2ac290f356edf9b5aa"));
        DeleteResult result = mongoTemplate.remove(query, User.class);
        long count = result.getDeletedCount();
        System.out.println(count);
    }

MongoRepository

添加Repository类

@Repository
public interface UserRepository extends MongoRepository<User, String> {

}

    //添加
    @Test
    public void createUser() {
        User user = new User();
        user.setAge(20);
        user.setName("张三");
        user.setEmail("3332200@qq.com");
        User user1 = userRepository.save(user);
    }

//查询所有
    @Test
    public void findUser() {
        List<User> userList = userRepository.findAll();
        System.out.println(userList);
    }

   //id查询
    @Test
    public void getById() {
        User user = userRepository.findById("5ffbfe8197f24a07007bd6ce").get();
        System.out.println(user);
    }

    //条件查询
    @Test
    public void findUserList() {
        User user = new User();
        user.setName("张三");
        user.setAge(20);
        Example<User> userExample = Example.of(user);
        List<User> userList = userRepository.findAll(userExample);
        System.out.println(userList);
    }

    //模糊查询
    @Test
    public void findUsersLikeName() {
        //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
        User user = new User();
        user.setName("三");
        Example<User> userExample = Example.of(user, matcher);
        List<User> userList = userRepository.findAll(userExample);
        System.out.println(userList);
    }

   //分页查询
    @Test
    public void findUsersPage() {
        Sort sort = Sort.by(Sort.Direction.DESC, "age");
//0为第一页
        Pageable pageable = PageRequest.of(0, 10, sort);
//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
        User user = new User();
        user.setName("三");
        Example<User> userExample = Example.of(user, matcher);
//创建实例
        Example<User> example = Example.of(user, matcher);
        Page<User> pages = userRepository.findAll(example, pageable);
        System.out.println(pages);
    }

    //修改
    @Test
    public void updateUser() {
        User user = userRepository.findById("5ffbfe8197f24a07007bd6ce").get();
        user.setName("张三_1");
        user.setAge(25);
        user.setEmail("883220990@qq.com");
        User save = userRepository.save(user);
        System.out.println(save);
    }

    //删除
    @Test
    public void delete() {
        userRepository.deleteById("5ffbfe8197f24a07007bd6ce");
    }