我有以下json文件
[
{
"id": 1,
"name": "Ramesh",
"designation": "SE",
"salary": 25000.00
},
{
"id": 2,
"name": "Anjali",
"designation": "SE",
"salary": 20000.00
},
{
"id": 2,
"name": "Harrish",
"designation": "PM",
"salary": 120000.00
},
{
"id": 4,
"name": "Rahul",
"designation": "TA",
"salary": 150000.00
}
]
这里我要插入所有记录或不插入任何记录。表示所有四条记录都将被插入到员工数据库中,或者上面都没有。但是在这里你可以看到第三条记录有重复的id 2,因为第二条记录的id保持相同的id,当我运行下面的mule应用程序MySQLIntegrityConstraintViolationException
时会发生错误但是前两条记录被插入到DB中错误出现在3号记录中。但是我想要的是防止插入记录或回滚更改,如果所有记录都没有插入到DB中(意味着任何错误介于其间)。
下面是我的mule xml配置文件,用于将json数据插入到DB中:
<sub-flow name="insert-fulltime-employee-details-subflow">
<dw:transform-message metadata:id="35bfe913-8de7-4b3c-9ba9-98f375a2873e" doc:name="Transform Message">
<dw:input-payload mimeType="application/json"/>
<dw:set-payload><![CDATA[%dw 1.0
%output application/java
---
payload map ((payload01 , indexOfPayload01) -> {
id: payload01.id,
name: payload01.name,
designation: payload01.designation,
salary: payload01.salary
})]]></dw:set-payload>
</dw:transform-message>
<foreach doc:name="For Each">
<db:insert config-ref="MySQL_Configuration" doc:name="Database-Insert">
<db:parameterized-query><![CDATA[insert into fulltime_employee values (#[payload.id], #[payload.name], #[payload.designation], #[payload.salary])]]></db:parameterized-query>
</db:insert>
</foreach>
<set-payload value="{"message": "All data successfully inserted into database"}" mimeType="application/json" doc:name="Set Payload"/>
</sub-flow>
我怎样才能做到这一点?
答案 0 :(得分:1)
将必须回滚的块包装在“事务范围”中。如下所示,
<transactional action="ALWAYS_BEGIN" doc:name="Transactional">
<db:insert config-ref="MySQL_Configuration" doc:name="Database-Insert">
<db:parameterized-query><![CDATA[insert into fulltime_employee values (#[payload.id], #[payload.name], #[payload.designation], #[payload.salary])]]></db:parameterized-query>
</db:insert>
</transactional>