Spring Data Mongodb事务

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最新推荐文章于 2025-05-10 20:06:26 发布

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分类专栏：大数据分布式数据仓库文章标签： Mongodb 事务

本文链接：https://blog.youkuaiyun.com/qq_24434491/article/details/102877143

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本文介绍了MongoDB从4.2版本开始支持的分片集群事务特性，并详细讲解了如何在Spring Boot应用中启用MongoDB事务，包括使用@Transactional注解进行事务管理及多连接操作。

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mongo4.2支持分片集群事务

MongoTransactionManager

Springboot 开启MongoDB事务

@EnableTransactionManagement
public class SpringBootApplication{
    public static void main(String[] args) {
        SpringApplication.run(SpringBootApplication.class, args);
    }
}


import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.mongodb.MongoDbFactory;
import org.springframework.data.mongodb.MongoTransactionManager;

@Configuration
public class MongoTransactionConfig {
    @Bean
    public MongoTransactionManager transactionManager(MongoDbFactory dbFactory) {
        return new MongoTransactionManager(dbFactory);
    }
}

@Transactional注解

session = client.startSession(); 
session.startTransaction();
session.commitTransaction();
session.abortTransaction();
session.endSession();

多个连接

final MongoClient client = MongoClients.create(uri);

/*
    Prereq: Create collections. CRUD operations in transactions must be on existing collections.
 */

client.getDatabase("mydb1").getCollection("foo")
        .withWriteConcern(WriteConcern.MAJORITY).insertOne( new Document("abc", 0));
client.getDatabase("mydb2").getCollection("bar")
        .withWriteConcern(WriteConcern.MAJORITY).insertOne( new Document("xyz", 0));

final ClientSession clientSession = client.startSession();

TransactionOptions txnOptions = TransactionOptions.builder()
        .readPreference(ReadPreference.primary())
        .readConcern(ReadConcern.LOCAL)
        .writeConcern(WriteConcern.MAJORITY)
        .build();

TransactionBody txnBody = new TransactionBody<String>() {
    public String execute() {
        MongoCollection<Document> coll1 = client.getDatabase("mydb1").getCollection("foo");
        MongoCollection<Document> coll2 = client.getDatabase("mydb2").getCollection("bar");

        coll1.insertOne(clientSession, new Document("abc", 1));
        coll2.insertOne(clientSession, new Document("xyz", 999));

        return "Inserted into collections in different databases";
    }
};
try {
    clientSession.withTransaction(txnOptions, txnBody);
} catch (RuntimeException e) {
    // some error handling
} finally {
    clientSession.close();
}