如何在 mule studio 应用程序中访问 jdbc 端点中的流变量

Question

<jdbc-ee:mysql-data-source name="MySQL_Data_Source" user="root" password="root" url="jdbc:mysql://localhost:3306/test" transactionIsolation="UNSPECIFIED" doc:name="MySQL Data Source"/>
<jdbc-ee:connector name="test" dataSource-ref="MySQL_Data_Source" validateConnections="true" queryTimeout="-1" pollingFrequency="0" doc:name="Database"/>
<data-mapper:config name="DataMapper" transformationGraphPath="mapper.grf" doc:name="DataMapper"/>
<flow name="EmployeeListFlow1" doc:name="EmployeeListFlow1">
    <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8082" doc:name="HTTP" path="employeelist"/>
    <json:json-to-object-transformer doc:name="JSON to Object" returnClass="java.util.Map"/>
    <choice doc:name="Choice">
        <when expression="payload.storeId == null || payload.storeId &lt;= 0 ">
            <set-variable variableName="query" value="select e.employeeid,e.companyid,e.firstName,e.lastName from employees e where companyid = #[message.payload.companyId]" doc:name="CompanyId"/>
        </when>
        <otherwise>
            <set-variable variableName="query" value="select e.employeeid,e.companyid,e.firstName,e.lastName from employees e where employeeid in (select employeeid from employeestores where storeid =#[message.payload.storeId] )" doc:name="StoreId"/>
        </otherwise>
    </choice>
    <jdbc-ee:outbound-endpoint exchange-pattern="request-response"  queryTimeout="-1" doc:name="EmployeeListFetch" connector-ref="Theatro" queryKey="employees_list">
        <jdbc-ee:query key="employees_list" value="#[flowVars['query']]"/>
    </jdbc-ee:outbound-endpoint>
    <json:object-to-json-transformer doc:name="Object to JSON"/>
</flow>

例外：

根异常堆栈跟踪：java.lang.IllegalArgumentException： 找不到 SQL 语句的 SQL 策略： #[flowVars['query']] at com.mulesoft.mule.transport.jdbc.sqlstrategy.EESqlStatementStrategyFactory.create（EESqlStatementStrategyFactory.java：109） at org.mule.transport.jdbc.JdbcMessageDispatcher.doSend（JdbcMessageDispatcher.java：69） at org.mule.transport.AbstractMessageDispatcher.process（AbstractMessageDispatcher.java：81） + 3 更多（为所有内容设置调试级别日志记录或"-Dmule.verbose.exceptions=true"）

在这里，我想基于输入构建动态 jdbc 查询。

json data {"companyId"："1"，"storeId"："1"}请帮助我。

Answer 1

尝试对 JDBC 动态出站端点使用类似以下内容的内容：

<outbound-endpoint address="jdbc://select * from ${datasource.table} #[variable:where-statement]" exchange-pattern="request-response"/>

呵

呵

Answer 2

这里有 2 个错误，
在"选择"中，表达式缺失[]
类似<when expression="[payload.storeId == null || payload.storeId &lt;= 0] ">
接下来你的查询应该是这样的：-

select e.employeeid,e.companyid,e.firstName,e.lastName from employees e where employeeid in (select employeeid from employeestores where storeid ='#[message.payload.storeId]' )  

其中#[message.payload.storeId]应该在''内，因为storeId是一个字符串