Question

我有一个JDBC连接器作为入站端点，在我的数据库中获取正确的结果集我注意到每一行都作为新消息返回。
我的问题：如何将所有行合并为一条消息？聚合器是唯一的选择吗？
使用Mule版本3.3.1 CE

<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:jersey="http://www.mulesoft.org/schema/mule/jersey"
xmlns:http="http://www.mulesoft.org/schema/mule/http"
xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
xmlns:spring="http://www.springframework.org/schema/beans" xmlns:jdbc="http://www.mulesoft.org/schema/mule/jdbc"
xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:mongo="http://www.mulesoft.org/schema/mule/mongo"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd 
http://www.mulesoft.org/schema/mule/jdbc http://www.mulesoft.org/schema/mule/jdbc/current/mule-jdbc.xsd 
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd 
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd 
http://www.mulesoft.org/schema/mule/jersey http://www.mulesoft.org/schema/mule/jersey/current/mule-jersey.xsd "    version="CE-3.3.1">




<context:property-placeholder location="configuration.properties" />
<spring:beans>
    <spring:bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <spring:property name="driverClassName" value="mydriver"/>
        <spring:property name="url" value="${jdbc.url}"/>
        <spring:property name="username" value="${jdbc.user}"/>
        <spring:property name="password" value="${jdbc.password}"/>
    </spring:bean>
</spring:beans>

<jdbc:connector name="AS400" dataSource-ref="dataSource"
    validateConnections="true" 
    queryTimeout="-1" 
    pollingFrequency="5000"
    transactionPerMessage="false"
    doc:name="Database">
    <jdbc:query key="selectNums" value="select someColumns from someTable"/>

</jdbc:connector>


<flow name="databaseFlow" doc:name="databaseFlow" processingStrategy="synchronous">


    <jdbc:inbound-endpoint 

        queryKey="selectNums" queryTimeout="-1" connector-ref="AS400"
        doc:name="select-record" pollingFrequency="45000">
    </jdbc:inbound-endpoint>


    <logger message="msg to send:  #[map-payload:col1]" level="INFO" doc:name="Logger" />
    <logger message="phone number: #[map-payload:col2]" level="INFO" doc:name="Logger" />


    <custom-transformer class="myTransformer" doc:name="Java"/>

</flow>

Answer 1

要接收包含所有行的单条消息，请执行以下操作：

使用<jdbc:transaction action="ALWAYS_BEGIN"/>在JDBC入站端点中启动事务，并在JDBC端点上设置transactionPerMessage="false"，

或

在流程开始时轮询JDBC出站端点：

<poll frequency="${polling.frequency}">
    <jdbc:outbound-endpoint queryKey="..."
        exchange-pattern="request-response" queryTimeout="30000" />
</poll>

在这两种情况下，您都会收到List<Map<String, Object>>有效负载的单条消息。

Mule JDBC组合结果集

1 个答案: