spring-data-mongodb提供了MongoTemplate与MongoRepository两种方式访问mongodb,MongoRepository操作简单,MongoTemplate操作灵活,我们在项目中可以灵活适用这两种方式操作mongodb,MongoRepository的缺点是不够灵活,MongoTemplate正好可以弥补不足。
使用 Spring Initializr 快速初始化一个 Spring Boot 工程
Group:com.atguigu
Artifact:mongodb
修改pom.xml:
- <dependencies>
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-data-mongodb</artifactId>
- </dependency>
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-web</artifactId>
- </dependency>
-
- <dependency>
- <groupId>org.projectlombok</groupId>
- <artifactId>lombok</artifactId>
- </dependency>
-
- <dependency>
- <groupId>joda-time</groupId>
- <artifactId>joda-time</artifactId>
- <version>2.10.1</version>
- </dependency>
-
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-test</artifactId>
- <scope>test</scope>
- <exclusions>
- <exclusion>
- <groupId>org.junit.vintage</groupId>
- <artifactId>junit-vintage-engine</artifactId>
- </exclusion>
- </exclusions>
- </dependency>
- </dependencies>
在application.properties文件添加配置:
spring.data.mongodb.uri=mongodb://47.93.118.241:27017/test
添加com.atguigu.mongodb.entity.User类:
- @Data
- @Accessors(chain = true)
- @Document("User")
- public class User {
- @Id
- private String id;
- private String name;
- private Integer age;
- private String email;
- private String createDate;
- }
常用方法
mongoTemplate.findAll(User.class): 查询User文档的全部数据
mongoTemplate.findById(
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")))
在/test/java下面添加测试类:
- @SpringBootTest
- class DemomogoApplicationTests {
-
- @Autowired
- private MongoTemplate mongoTemplate;
-
- //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);
- }
- }
Spring Data提供了对mongodb数据访问的支持,我们只需要继承MongoRepository类,按照Spring Data规范就可以了
SpringData 方法定义规范:
1、不是随便声明的,而需要符合一定的规范
2、 查询方法以find | read | get开头
3、 涉及条件查询时,条件的属性用条件关键字连接
4、 要注意的是:条件属性首字母需要大写
5、 支持属性的级联查询,但若当前类有符合条件的属性则优先使用,而不使用级联属性,若需要使用级联属性,则属性之间使用_强制进行连接
添加com.atguigu.mongodb.repository.UserRepository类:
- package com.atguigu.mongodb.repository;
-
- import com.atguigu.mongodb.entity.User;
- import org.springframework.data.mongodb.repository.MongoRepository;
- import org.springframework.stereotype.Repository;
-
- import java.util.List;
-
- @Repository
- public interface UserRepository extends MongoRepository
{ -
- }
在/test/java下面添加测试类:
- @SpringBootTest
- class DemomogoApplicationTests1 {
-
- @Autowired
- private UserRepository userRepository;
-
- //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");
- }
- }