SpringDataMongoDB多文档事务的实现
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一、安装MongoDB4.0.3（××）
1.1、官方安装文档
https://docs.mongodb.com/manual/tutorial/install-mongodb-on-red-hat/
1.2、tar.gz包下载地址
https://www.mongodb.com/download-center/community?jmp=docs
1.3、复制集官方配置
https://docs.mongodb.com/manual/administration/replica-set-member-configuration/
二、SpringProject版本依赖（×）
Spring：5.1.1.RELEASE 以上
SpringDataMongoDB:2.1.1.RELEASE 以上
三、配置MongoTransactionManager（SpringBoot使用方式）
SpringBoot 集成非常简单，配置MongoTransastionManager，目前Spring-boot-starter-data-mongodb 版本较低不支持，因此暂未验证，SpringBoot配置复制集参考SpringBoot相关文档
@Configuration
static class Config extends AbstractMongoConfiguration {
@Bean
MongoTransactionManager transactionManager(MongoDbFactory dbFactory) {
return new MongoTransactionManager(dbFactory);
}
// ...
}
四、配置MongoTransactionManager（普通Spring项目）
<context:property-placeholder location="classpath:mongo.properties" ignore-unresolvable="true"
file-encoding="utf-8" />
<!--
重点配置
1.安全配置：credentials="${mongo.user}:${mongo.password}@${mongo.database}"
2.单机配置：host="${mongo.host}" port="${mongo.port}"
3.副本集配置：replica-set="${mongo.replSet}"
-->
<mongo:mongo-client id="mongoClient" replica-set="${mongo.replSet}">
<mongo:client-options min-connections-per-host="${mongo.minConnectionsPerHost}"
write-concern="SAFE"
read-preference="NEAREST"
threads-allowed-to-block-for-connection-multiplier="${mongo.threadsAllowedToBlockForConnectionMultiplier}"
connect-timeout="${mongo.connectTimeout}" max-wait-time="${mongo.maxWaitTime}"
socket-keep-alive="${mongo.socketKeepAlive}" socket-timeout="${mongo.socketTimeout}"
max-connection-idle-time="${mongo.maxConnectionIdleTime}"
max-connection-life-time="${mongo.maxConnectionLifeTime}"
heartbeat-socket-timeout="${mongo.heartbeatSocketTimeout}"
heartbeat-connect-timeout="${mongo.heartbeatConnectTimeout}"
min-heartbeat-frequency="${mongo.minHeartbeatFrequency}"
heartbeat-frequency="${mongo.heartbeatFrequency}" />
</mongo:mongo-client>
<mongo:db-factory id="mongoDbFactory" dbname="${mongo.database}"
mongo-ref="mongoClient" />
<bean id="mappingContext"
class="org.springframework.data.mongodb.core.mapping.MongoMappingContext" />
<bean id="defaultMongoTypeMapper"
class="org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper">
<constructor-arg name="typeKey">
<null />
</constructor-arg>
</bean>
<bean id="mappingMongoConverter"
class="org.springframework.data.mongodb.core.convert.MappingMongoConverter">
<constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
<constructor-arg name="mappingContext" ref="mappingContext" />
<property name="typeMapper" ref="defaultMongoTypeMapper" />
</bean>
<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
<constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
<constructor-arg name="mongoConverter" ref="mappingMongoConverter" />
</bean>
<!-- 重点配置 -->
<bean id="mongoTransactionManager" class="org.springframework.data.mongodb.MongoTransactionManager">
<constructor-arg name="dbFactory" ref="mongoDbFactory"/>
</bean>
<tx:annotation-driven transaction-manager="mongoTransactionManager" proxy-target-class="true"/>
五、使用事务（×）
@Service
public class StateService {
@Autowired
private MongoTemplate teplate;
@Transactional
void someBusinessFunction(Step step) {
template.insert(step);
log.debug(1/0);
};
});
六、Mongo.properties 配置
mongo.host=192.168.1.66 mongo.port=27017 mongo.replSet=192.168.1.66:2000,192.168.1.66:2001,192.168.1.66:2002 mongo.minConnectionsPerHost=10 mongo.threadsAllowedToBlockForConnectionMultiplier=4 mongo.connectTimeout=30000 mongo.maxWaitTime=3000 mongo.socketKeepAlive=false mongo.socketTimeout=30000 mongo.maxConnectionIdleTime=0 mongo.maxConnectionLifeTime=0 mongo.heartbeatSocketTimeout=20000 mongo.heartbeatConnectTimeout=10000 mongo.minHeartbeatFrequency=3000 mongo.heartbeatFrequency=5000 mongo.database=labsta
七、最后是重点（×××××）
7.1、必须使用复制集，单节点不支持，mongodb4.2 会支持分片集事务，复制集安装请自行研究
7.2、使用事务之前（@Transaction），数据库和文档必须提前创建，如何解决呢？且看下篇
7.3、Spring版本和SpringDataMongodb版本必须遵循 @SpringProject版本依赖
7.4、注意，此处的复制集不是4.0版本之前的主从复制集群，4.0之后已废弃主从模式
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。