Question

我正在使用ESB在SQL和REST调用之间路由数据。到目前为止，这工作正常，但是当我想向REST调用中添加选项时。例如：

2018-12-24 16:15:39.795 CST [orderer/consensus/kafka] processMessagesToBlocks -> ERRO 0ec [channel: ordererchannel] Error during consumption: kafka: error while consuming ordererchannel/0: kafka: error decoding packet: CRC didn't match expected 0x0 got 0xe38a6876
2018-12-24 16:15:39.796 CST [orderer/consensus/kafka] processMessagesToBlocks -> WARN 0ed [channel: ordererchannel] Deliver sessions will be dropped if consumption errors continue.
2018-12-24 16:15:41.796 CST [orderer/consensus/kafka/sarama] dispatcher)-fm -> DEBU 0ee consumer/ordererchannel/0 finding new broker
2018-12-24 16:15:41.796 CST [orderer/consensus/kafka/sarama] RefreshMetadata -> DEBU 0ef client/metadata fetching metadata for [ordererchannel] from broker 192.168.1.36:9092
2018-12-24 16:15:41.809 CST [orderer/consensus/kafka/sarama] Open -> DEBU 0f0 ClientID is the default of 'sarama', you should consider setting it to something application-specific.
2018-12-24 16:15:41.809 CST [orderer/consensus/kafka/sarama] subscriptionConsumer -> DEBU 0f1 consumer/broker/3 added subscription to ordererchannel/0
2018-12-24 16:15:41.810 CST [orderer/consensus/kafka] processMessagesToBlocks -> WARN 0f2 [channel: ordererchannel] Consumption will resume.
2018-12-24 16:15:41.816 CST [orderer/consensus/kafka/sarama] withRecover -> DEBU 0f3 Connected to broker at 192.168.1.50:9092 (registered as #3)
2018-12-24 16:15:41.832 CST [orderer/consensus/kafka/sarama] subscriptionConsumer)-fm -> DEBU 0f4 consumer/broker/3 disconnecting due to error processing FetchRequest: kafka: error decoding packet: CRC didn't match expected 0x0 got 0xe38a6876
2018-12-24 16:15:41.833 CST [orderer/consensus/kafka/sarama] abort -> DEBU 0f5 Closed connection to broker 192.168.1.50:9092

，SQL代码为：

<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">

    <camelContext xmlns="http://camel.apache.org/schema/blueprint">
        <propertyPlaceholder id="placeholder"
             location="file:${karaf.home}/etc/nl.test.astron.sql.cfg" />


<restConfiguration bindingMode="json" component="servlet">
            <endpointProperty key="servletName" value="ASTRONServlet" />
        </restConfiguration>

        <rest path="/get/astrondata">
            <get uri="">            
                <to pattern="InOut" uri="direct:get" />         
            </get>
        </rest>

        <route id="get_to_uri">
            <from uri="direct:get"/>
            <setHeader headerName="boundRaMin">
                <simple>70</simple>
            </setHeader>
            <setHeader headerName="boundRaMax">
                <simple>90</simple>
            </setHeader>
            <setHeader headerName="boundDecMin">
                <simple>0</simple>
            </setHeader>
            <setHeader headerName="boundDecMax">
                <simple>30</simple>
            </setHeader>    
            <to uri="sql:{{sql.getDatabase}}?
                outputType=SelectList&amp;
                greedy=true&amp;
                useIterator=false"/>
        </route>

正如在这里可以看到的那样，boundRaMin，boundRaMax，boundDecMin，boundDecMax都由标头设置，但是我想根据rest调用中定义的选项来设置这些变量。因此，例如以下调用：

http://localhost:8080/astron/get/astrondata?boundRaMin=value1&boundRaMax=value2&boundDecMin=value3&boundDecMax=value4

应将正确的value1 ... value4值填充到标题中。这些查询参数似乎没有映射到标题。

Answer 1

根据camel-sql组件，从Camel 2.14开始，您可以使用简单表达式。因此，尝试将占位符sql.getDatabase修改为以下内容：

sql.getDatabase=SELECT * FROM dbo.astron_data WHERE :${header.boundRaMin} < ra AND 
                ra < ${header.boundRaMax} AND ${header.boundDecMin} < dec AND dec < ${header.boundDecMax}

如何将REST调用的选项作为参数添加到标头？

1 个答案: