spring-boot-mongodb
1. 功能
利用spring链接MongoDB,并进行增删改查
2. 类结构图
3. 实现
代码结构
实体#UserEntity
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
package com.jihite.entity; public class UserEntity { private int id; private String name; private String passwd; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPasswd() { return passwd; } public void setPasswd(String passwd) { this.passwd = passwd; } @Override public String toString() { return String.format("id:%s, name:%s, passwd:%s", id, name, passwd); } }
接口#UserDao
package com.jihite.dao; import com.jihite.entity.UserEntity; public interface UserDao { void saveUser(UserEntity userDao); UserEntity getUserByName(String name); long updateUserEntity(UserEntity userEntity); void deleteUserById(int id); }
实现#UserDaoImpl
package com.jihite.dao.impl; import com.jihite.dao.UserDao; import com.jihite.entity.UserEntity; import com.mongodb.client.result.UpdateResult; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.mongodb.core.MongoTemplate; import org.springframework.data.mongodb.core.query.Criteria; import org.springframework.data.mongodb.core.query.Query; import org.springframework.data.mongodb.core.query.Update; import org.springframework.stereotype.Component; @Component public class UserDaoImpl implements UserDao{ @Autowired private MongoTemplate mongoTemplate; @Override public void saveUser(UserEntity userDao) { mongoTemplate.save(userDao); } @Override public UserEntity getUserByName(String name) { Query query = new Query(Criteria.where("name").is(name)); return mongoTemplate.findOne(query, UserEntity.class); } @Override public long updateUserEntity(UserEntity userEntity) { Query query = new Query(Criteria.where("id").is(userEntity.getId())); Update update = new Update().set("name", userEntity.getName()).set("passwd", userEntity.getPasswd()); UpdateResult writeResult = mongoTemplate.updateFirst(query, update, UserEntity.class); return writeResult.getMatchedCount(); } @Override public void deleteUserById(int id) { Query query = new Query(Criteria.where("id").is(id)); mongoTemplate.remove(query, UserEntity.class); } }
#测试
package com.jihite.dao; import com.jihite.entity.UserEntity; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; @RunWith(SpringRunner.class) @SpringBootTest public class UserDaoTest { @Autowired private UserDao userDao; @Test public void testSaveUser() { UserEntity user = new UserEntity(); user.setId(1); user.setName("jihite"); user.setPasswd("abc"); userDao.saveUser(user); } @Test public void testGetUserByName() { UserEntity user = userDao.getUserByName("jihite"); System.out.println(user); } @Test public void testUpdateUserEntity() { UserEntity user = new UserEntity(); user.setId(1); user.setName("jihite2"); user.setPasswd("efg"); userDao.updateUserEntity(user); user = userDao.getUserByName("jihite2"); System.out.println(user); } @Test public void testDeleteUserById() { userDao.deleteUserById(1); UserEntity user = new UserEntity(); System.out.println(userDao.getUserByName("jihite")); System.out.println(userDao.getUserByName("jihite2")); } }
4. 注释
4.1 spring boot父级依赖
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.3.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent>
这块配置就是Spring Boot父级依赖,有了这个,当前的项目就是Spring Boot项目了。spring-boot-starter-parent是一个特殊的starter,它用来提供相关的Maven默认依赖,使用它之后,常用的包依赖可以省去version标签。
4.2 起步依赖spring-boot-starter-***
起步依赖就像品牌机(对比组装机),自动给你封装好了你想要实现的功能的依赖,减少解决依赖关系耗费精力。
spring boot提供了很多起步依赖降低项目依赖的复杂度。
5. 代码