Spring Data MongoDB插入

在Spring Data MongoDB中，使用save()和insert()方法可以插入一个或多个文档到数据库。

User user = new User("...");

//save user object into "user" collection / table
//class name will be used as collection name
mongoOperation.save(user);

//save user object into "tableA" collection
mongoOperation.save(user,"tableA");

//insert user object into "user" collection
//class name will be used as collection name
mongoOperation.insert(user);

//insert user object into "tableA" collection
mongoOperation.insert(user, "tableA");

//insert a list of user objects
mongoOperation.insert(listofUser);

默认情况下，保存文档时如果没有指定集合名，使用类名作为集合名。

1. 插入

save和insert的区别：

• 1. save - 应该叫做saveOrUpdate()，当_id存在执行insert()，当_id不存在执行update()。
• 2. insert - 只是insert，如果_id存在会报错。

//get an existed data, and update it
User userD1 = mongoOperation.findOne(
    new Query(Criteria.where("age").is(64)), User.class);
userD1.setName("new name");
userD1.setAge(100);

//if you insert it, 'E11000 duplicate key error index' error is generated.
//mongoOperation.insert(userD1);

//instead you should use save.
mongoOperation.save(userD1);

2. 插入文档完整实例

使用spring容器创建mongoTemplate。

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.mongodb.core.MongoTemplate;
import com.mongodb.MongoClient;

/**
 * Spring MongoDB configuration file
 *
 */
@Configuration
public class SpringMongoConfig{

    public @Bean
    MongoTemplate mongoTemplate() throws Exception {

        MongoTemplate mongoTemplate =
            new MongoTemplate(new MongoClient("127.0.0.1"),"yourdb");
        return mongoTemplate;

    }

}

使用@Document指定集合名称。本例中，保存user对象时，保存的集合名称是users。

import java.util.Date;
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.index.Indexed;
import org.springframework.data.mongodb.core.mapping.Document;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.format.annotation.DateTimeFormat.ISO;

@Document(collection = "users")
public class User {

    @Id
    private String id;

    @Indexed
    private String ic;

    private String name;

    private int age;

    @DateTimeFormat(iso = ISO.DATE_TIME)
    private Date createdDate;

    //getter and setter methods
}

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.data.mongodb.core.MongoOperations;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;

import com.mkyong.config.SpringMongoConfig;
import com.mkyong.user.User;

public class App {

    public static void main(String[] args) {
        // For Annotation
        ApplicationContext ctx =
                     new AnnotationConfigApplicationContext(SpringMongoConfig.class);
        MongoOperations mongoOperation =
                     (MongoOperations) ctx.getBean("mongoTemplate");

        // Case1 - insert a user, put "tableA" as collection name
        System.out.println("Case 1...");
        User userA = new User("1000", "apple", 54, new Date());
        mongoOperation.save(userA, "tableA");

        // find
        Query findUserQuery = new Query();
        findUserQuery.addCriteria(Criteria.where("ic").is("1000"));
        User userA1 = mongoOperation.findOne(findUserQuery, User.class, "tableA");
        System.out.println(userA1);

        // Case2 - insert a user, put entity as collection name
        System.out.println("Case 2...");
        User userB = new User("2000", "orange", 64, new Date());
        mongoOperation.save(userB);

        // find
        User userB1 = mongoOperation.findOne(
                     new Query(Criteria.where("age").is(64)), User.class);
        System.out.println(userB1);

        // Case3 - insert a list of users
        System.out.println("Case 3...");
        User userC = new User("3000", "metallica", 34, new Date());
        User userD = new User("4000", "metallica", 34, new Date());
        User userE = new User("5000", "metallica", 34, new Date());
        List<User> userList = new ArrayList<User>();
        userList.add(userC);
        userList.add(userD);
        userList.add(userE);
        mongoOperation.insert(userList, User.class);

        // find
        List<User> users = mongoOperation.find(
                           new Query(Criteria.where("name").is("metallica")),
               User.class);

        for (User temp : users) {
            System.out.println(temp);
        }

        //save vs insert
        System.out.println("Case 4...");
        User userD1 = mongoOperation.findOne(
                          new Query(Criteria.where("age").is(64)), User.class);
        userD1.setName("new name");
        userD1.setAge(100);

        //E11000 duplicate key error index, _id existed
        //mongoOperation.insert(userD1);
        mongoOperation.save(userD1);
        User userE1 = mongoOperation.findOne(
                         new Query(Criteria.where("age").is(100)), User.class);
        System.out.println(userE1);
    }

}