spring data mongodb 多数据源连接

参考链接：(3条消息) mongo多数据源教程 mongoTemplate 多数据源_ccubee的博客-优快云博客_mongotemplate 多数据源 参考链接：(3条消息) Spring Boot配置MongoDB多数据源_张小凡vip的博客-优快云博客 

1、依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <optional>true</optional>
</dependency>

2、配置,副本集模式连接mongo，readPreference=primary才可以使用事务

spring:
  data:
    mongodb:
      自定义参数1:
        uri: mongodb://账号:密码@ip:端口号?slaveOk=true&replicaSet=xxx&write=1&readPreference=primary&connectTimeoutMS=30000&socketTimeoutMS=30000
        database: 数据库名1
      自定义参数2:
        uri: mongodb://账号:密码@ip:端口号?slaveOk=true&replicaSet=xxx&write=1&readPreference=primary&connectTimeoutMS=30000&socketTimeoutMS=30000
        database: 数据库名2

3、 继承AbstractMongoClientConfiguration ，第一个数据源指定一下  @Primary，第二个数据源同第一个一样，无需指定  @Primary

@Setter
@Getter
@Configuration
@ConfigurationProperties(prefix = "spring.data.mongodb.xxxx")
@Component
public class MongoConfig extends AbstractMongoClientConfiguration {

    private String uri;

    private String database;

    @Override
    protected String getDatabaseName() {
        return database;
    }
    @Override
    public MongoClient mongoClient() {
        return MongoClients.create(uri);
    }


    @Primary
    @Override
    @Bean("xxxxMongoDbFactory")
    public MongoDatabaseFactory mongoDbFactory() {
        return new SimpleMongoClientDatabaseFactory(mongoClient(), getDatabaseName());
    }

    @Primary
    @Bean(name = "xxxxTemplate")
    public MongoTemplate getMongoTemplate(@Qualifier("xxxxMongoDbFactory") MongoDatabaseFactory mongoDbFactory,
                                          @Qualifier("xxxxMappingMongoConverter") MappingMongoConverter mappingMongoConverter) throws Exception {
        return new MongoTemplate(mongoDbFactory,mappingMongoConverter);
    }

    @Primary
    @Bean("xxxxMongoTransactionManager")
    public MongoTransactionManager transactionManager(
            @Qualifier("xxxxMongoDbFactory") MongoDatabaseFactory mongoDbFactory){
        return new MongoTransactionManager(mongoDbFactory);
    }


    @Primary
    @Bean("xxxxMongoMappingContext")
    public MongoMappingContext mongoMappingContext() {
        MongoMappingContext mappingContext = new MongoMappingContext();
        return mappingContext;
    }

    @Primary
    @Bean("xxxxMappingMongoConverter") //使用自定义的typeMapper去除写入mongodb时的“_class”字段
    public MappingMongoConverter mappingMongoConverter(@Qualifier("xxxxMongoDbFactory") MongoDatabaseFactory mongoDbFactory,
                                                       @Qualifier("xxxxMongoMappingContext") MongoMappingContext mongoMappingContext) throws Exception {
        DefaultDbRefResolver dbRefResolver = new DefaultDbRefResolver(mongoDbFactory);
        MappingMongoConverter converter = new MappingMongoConverter(dbRefResolver, mongoMappingContext);
        converter.setTypeMapper(new DefaultMongoTypeMapper(null));
        return converter;
    }

}

4、使用

@Autowired
private MongoTemplate mongoTemplate;


@Autowired
@Qualifier("xxxTemplate")
private MongoTemplate xxxMongoTemplate;

 第二个数据源指定一下@Qualifier("xxxTemplate")，第一个数据源可以默认，也可指定。

注意，此时事务回滚不能在两个数据源中同时生效