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准备数据库

切换/创建数据库

use test

如果数据库不存在,则创建数据库,否则切换到指定数据库
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创建一个集合(table)

得到指定名称的集合(table )

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插入

db.User.save({name:‘zhangsan’,age:21,sex:true})
db.User.find()
{"_id": Objectld(“4f69e680c9106ee2ec95da66”), “name”: “zhangsan”, “age”: 21,
“sex”: true}

准备环境

引入依赖
添加配置
实体类

@Data
@Document("User")
public class User {

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

一、基于MongoTemplate 开发CRUD

添加、查询所有

@SpringBootTest
class MongodbApplicationTests {

    @Autowired
    private MongoTemplate mongoTemplate;

    //添加
    @Test
    public void createUser() {
        User user = new User();
        user.setAge(20);
        user.setName("test");
        user.setEmail("[email protected]");
        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);
    }


}

结果
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其他查询

//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

 //修改
    @Test
    public void updateUser() {
        User user = mongoTemplate.findById("5ffbfa2ac290f356edf9b5aa", User.class);
        user.setName("test_1");
        user.setAge(25);
        user.setEmail("[email protected]");
        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

//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);
    }

二、基于MongoRepository开发CRUD

添加

//添加
    @Test
    public void createUser() {
        User user = new User();
        user.setAge(20);
        user.setName("张三");
        user.setEmail("[email protected]");
        User user1 = userRepository.save(user);
    }

查询

//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

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

删除

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