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 namemongoOperation.save(user);//save user object into "tableA" collectionmongoOperation.save(user,"tableA");//insert user object into "user" collection//class name will be used as collection namemongoOperation.insert(user);//insert user object into "tableA" collectionmongoOperation.insert(user, "tableA");//insert a list of user objectsmongoOperation.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()。
• 1. insert - 只是insert，如果_id存在会报错。

//get an existed data, and update itUser 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 * */@Configurationpublic 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);    }}