[英]Spring Integration JPA inbound channel adapter
I have a spring-integration
message channel
which read from a database using a jpa inbound-channel-adapter
. 我有一个
spring-integration
message channel
,该message channel
使用jpa inbound-channel-adapter
从数据库中读取。
<int:channel id="logChannel">
<int:priority-queue capacity="20" />
</int:channel>
<int-jpa:inbound-channel-adapter
channel="logChannel" entity-class="com.objects.Transactionlog"
entity-manager-factory="entityManagerFactory" auto-startup="true"
jpa-query="SELECT x FROM Transactionlog AS x WHERE x.status LIKE '1'" max-results="1">
<int:poller fixed-rate="5000">
<int:transactional propagation="REQUIRED"
transaction-manager="transactionManager" />
</int:poller>
</int-jpa:inbound-channel-adapter>
This always reads only the first row of the table transactionlog
. 这总是只读取表
transactionlog
的第一行。 So I want to update the status
of each database entry just after read. 因此,我想在读取后立即更新每个数据库条目的
status
。 Any body know how to do that? 任何人都知道该怎么做吗?
If max-results="1"
is OK for you and receive only one entity per 5 second is appropiate for your use-case, let it be. 如果
max-results="1"
对您来说还可以,并且每5秒仅收到一个实体适合您的用例,那就顺其自然。
Now how to update that entity to skip it on the next poll. 现在,如何更新该实体以在下一次轮询时跳过它。
The <int-jpa:inbound-channel-adapter>
has delete-after-poll="true"
option, which allows to perform entityManager.remove(entity)
after an entity retrival. <int-jpa:inbound-channel-adapter>
具有delete-after-poll="true"
选项,该选项允许在entityManager.remove(entity)
后执行entityManager.remove(entity)
。
Right, it is the real removal from DB. 正确,这是从数据库中真正删除的内容。 To convert it to the UPDATE, you can mark your entity with:
要将其转换为UPDATE,可以用以下方式标记您的实体:
@SQLDelete(sql = "UPDATE Transactionlog SET status = false WHERE id = ?")
Or something similar, that is appropiate for you. 或类似的东西,适合您。
Another feature is Transaction Synchronization , when you mark your <poller>
with some before-commit
factory and do UPDATE there. 另一个功能是事务同步 ,当您用一些
before-commit
工厂标记<poller>
并before-commit
那里进行UPDATE时。 Something like: 就像是:
<int-jpa:inbound-channel-adapter ...>
<int:poller fixed-rate="5000">
<int:transactional propagation="REQUIRED"
transaction-manager="transactionManager"
synchronization-factory="txSyncFactory" />
</int:poller>
<int-jpa:inbound-channel-adapter>
<int:transaction-synchronization-factory id="txSyncFactory">
<int:before-commit channel="updateEntityChannel" />
</int:transaction-synchronization-factory>
<int:chain input-channel="updateEntityChannel">
<int:enricher>
<int:property name="status" value="true"/>
</int:enricher>
<int-jpa:outbound-channel-adapter entity-manager="entityManager"/>
</int:chain/>
Something like that. 这样的事情。
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