Spring MongoTemplate example 2016-06-15 19:00
MongoTemplate can help you CURD documents in MongoDB easily. In this page I will show you how to use it. I would recommend you to learn Mongo tutorial first, if you are unfamiliar with commends in MongoDB. For quick start I use Spring Boot to test MongoTemplate.
project structure
└─main
├─java
│ └─com
│ └─henryxi
│ └─mongo
│ └─template
│ Address.java
│ QueryClient.java
│ User.java
│
└─resources
application.properties
pom
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
<version>1.3.3.RELEASE</version>
</dependency>
application.properties
spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.database=user_database
MongoTemplate example code
@SpringBootApplication
public class QueryClient implements CommandLineRunner {
@Autowired
private MongoTemplate mongoTemplate;
public static void main(String[] args) {
SpringApplication.run(QueryClient.class, args);
}
public void run(String... strings) throws Exception {
// save data
User henry = new User("Henry", 27);
mongoTemplate.save(henry);
Address beijing = new Address("China", "Beijing");
Address shanghai = new Address("China", "Shanghai");
User justin = new User("Justin", 28, beijing);
User mathew = new User("Mathew", 23, shanghai);
User charles = new User("Charles", 32, beijing);
List<User> users = new ArrayList<User>();
users.add(justin);
users.add(mathew);
users.add(charles);
mongoTemplate.insert(users, User.class);
//delete data
String justinId = justin.getId();
justin.setId("123456");
mongoTemplate.remove(justin);//delete fail when change the id
Query queryMathew = new Query();
queryMathew.addCriteria(Criteria.where("name").is("Mathew"));
mongoTemplate.remove(queryMathew, User.class);
justin.setId(justinId);
mongoTemplate.remove(justin);
//query data
Query queryHenry = new Query();
queryHenry.addCriteria(Criteria.where("name").is("Henry"));
List<User> usersInDB = mongoTemplate.find(queryHenry, User.class);
System.out.println(usersInDB.get(0));
String id = usersInDB.get(0).getId();
User user = mongoTemplate.findById(id, User.class);
System.out.println(user);
//update data
Query queryJustin = new Query();
Update updateHenry = new Update().set("name", "new Henry");
User oldHenry = mongoTemplate.findAndModify(queryHenry, updateHenry, User.class);//return old user object
System.out.println(oldHenry);
queryJustin.addCriteria(Criteria.where("name").is("Charles"));
Update updateCharles = new Update().set("name", "new Charles");
FindAndModifyOptions returnNew = new FindAndModifyOptions().returnNew(true);
User newCharles = mongoTemplate.findAndModify(queryJustin, updateCharles, returnNew, User.class);//return new user object
System.out.println(newCharles);
}
}