Question

即使payload.second为null（可选参数），如何使此代码正常工作。

<int-jdbc:stored-proc-outbound-gateway id="outGtw" 
                                       data-source="someDs" 
                                       request-channel="someChannel" 
                                       reply-channel="someOtherChannel" 
                                       stored-procedure-name="someStoredProcedure"
                                       ignore-column-meta-data="true">
  <int-jdbc:sql-parameter-definition name="first"/>
  <int-jdbc:sql-parameter-definition name="second"/>
  <int-jdbc:sql-parameter-definition name="outParam" direction="OUT" type="NVARCHAR"/>
  <int-jdbc:parameter name="first" expression="payload.first"/>
  <int-jdbc:parameter name="second" expression="payload.second"/>
</int-jdbc:stored-proc-outbound-gateway>

这是null -

时出错

   Caused by: org.springframework.dao.InvalidDataAccessApiUsageException: Required input parameter 'second' is missing
    at org.springframework.jdbc.core.CallableStatementCreatorFactory$CallableStatementCreatorImpl.createCallableStatement(CallableStatementCreatorFactory.java:211) ~[spring-jdbc-4.0.7.RELEASE.jar:4.0.7.RELEASE]
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:1115) ~[spring-jdbc-4.0.7.RELEASE.jar:4.0.7.RELEASE]
    at org.springframework.jdbc.core.JdbcTemplate.call(JdbcTemplate.java:1173) ~[spring-jdbc-4.0.7.RELEASE.jar:4.0.7.RELEASE]
    at org.springframework.jdbc.core.simple.AbstractJdbcCall.executeCallInternal(AbstractJdbcCall.java:381) ~[spring-jdbc-4.0.7.RELEASE.jar:4.0.7.RELEASE]
    at org.springframework.jdbc.core.simple.AbstractJdbcCall.doExecute(AbstractJdbcCall.java:342) ~[spring-jdbc-4.0.7.RELEASE.jar:4.0.7.RELEASE]
    at org.springframework.jdbc.core.simple.SimpleJdbcCall.execute(SimpleJdbcCall.java:190) ~[spring-jdbc-4.0.7.RELEASE.jar:4.0.7.RELEASE]
    at org.springframework.integration.jdbc.StoredProcExecutor.executeStoredProcedureInternal(StoredProcExecutor.java:328) ~[spring-integration-jdbc-4.0.4.RELEASE.jar:na]
    at org.springframework.integration.jdbc.StoredProcExecutor.executeStoredProcedure(StoredProcExecutor.java:297) ~[spring-integration-jdbc-4.0.4.RELEASE.jar:na]
    at org.springframework.integration.jdbc.StoredProcOutboundGateway.handleRequestMessage(StoredProcOutboundGateway.java:60) ~[spring-integration-jdbc-4.0.4.RELEASE.jar:na]
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler$AdvisedRequestHandler.handleRequestMessage(AbstractReplyProducingMessageHandler.java:313) ~[spring-integration-core-4.0.4.RELEASE.jar:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.6.0_31]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) ~[na:1.6.0_31]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[na:1.6.0_31]
    at java.lang.reflect.Method.invoke(Method.java:597) ~[na:1.6.0_31]
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) ~[spring-aop-4.0.7.RELEASE.jar:4.0.7.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) ~[spring-aop-4.0.7.RELEASE.jar:4.0.7.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.0.7.RELEASE.jar:4.0.7.RELEASE]
    at org.springframework.integration.handler.advice.AbstractRequestHandlerAdvice$1.cloneAndExecute(AbstractRequestHandlerAdvice.java:92) ~[spring-integration-core-4.0.4.RELEASE.jar:na]
    at org.springframework.integration.handler.advice.RequestHandlerRetryAdvice$2.doWithRetry(RequestHandlerRetryAdvice.java:88) ~[spring-integration-core-4.0.4.RELEASE.jar:na]
    at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:263) ~[spring-retry-1.1.1.RELEASE.jar:na]
    at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:193) ~[spring-retry-1.1.1.RELEASE.jar:na]
    at org.springframework.integration.handler.advice.RequestHandlerRetryAdvice.doInvoke(RequestHandlerRetryAdvice.java:85) ~[spring-integration-core-4.0.4.RELEASE.jar:na]
    ... 88 common frames omitted

Answer 1

感谢StackTrace。调查一下，当您无法获得参数时，我只会看到一个地方 - ExpressionEvaluatingSqlParameterSourceFactory：

public boolean hasValue(String paramName) {
        try {
            Object value = doGetValue(paramName, true);
            if (value == ERROR) {
                return false;
            }
        }
        catch (ExpressionException e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Could not evaluate expression", e);
            }
            if (this.cache) {
                values.put(paramName, ERROR);
            }
            return false;
        }
        return true;
    }

CallMetaDataContext#matchInParameterValuesWithCallParameters无法填充second参数，因为hasValue()会返回false。这只发生在ExpressionException。

的情况下

启用DEBUG类别的org.springframework.integration.jdbc日志记录，您了解原因。

我想你在这里只展示了简单的表达式（payload.second）表示并不会使这个问题复杂化。

存储过程出站网关空参数处理

1 个答案: