Question

如何在语句末尾添加返回findSingleOrNoItem()以在getClassName()语句中显示for循环计数器getAbsolutePercentage()和findSingleOrNoItem()？我添加了一个计数器的原因，有些会有getClassName()和getAbsolutePercentage()的4个值，有些会有6个值吗？所以这将取决于在setParameter 1上传递的cosModel。

@Override
public TrafficProfile getTrafficProfileByCosClassAllocationNew(CosModel cosModel, Direction direction, 
        List<ClassOfServiceAllocation> cosClassAllocation, RouterType routerType) throws Exception {


    EntityManager em = getEntityManager();
    logger.info("Starting getTrafficProfileByCosClass2Allocations cos2 " );
    Query query = em.createNativeQuery(buildTrafficProfileByCosClassAllocationQueryNew(cosModel, direction,  cosClassAllocation, routerType), TrafficProfile.class);
    query.setParameter(1, cosModel.name());
    query.setParameter(2, direction.name());
    int i= 2;
            for(ClassOfServiceAllocation alloc : cosClassAllocation){
                query.setParameter(i++, alloc.getClassName());
                query.setParameter(i++, alloc.getAbsolutePercentage());
            }

    return findSingleOrNoItem(query, "Traffic_Profile", "cos_model = " + cosModel.name() + ", direction = " + direction.name() +  ?;
}

我正在遵循以下现有代码，但这仅适用于cos6。我将同时拥有cos4和cos6，因此我无法进行硬编码。

@Override
public TrafficProfile getTrafficProfileByCosClassAllocations(Direction direction,
        ClassOfService6Allocations cosClassAllocation, RouterType routerType) throws Exception {

    EntityManager em = getEntityManager();
    logger.info("Starting getTrafficProfileByCosClass6Allocations cos6"  );
    Query query = em.createNativeQuery(buildTrafficProfileByCosClassAllocationsQuery(direction, cosClassAllocation, routerType), TrafficProfile.class);
    query.setParameter(1, "cos6");
    query.setParameter(2, direction.name());
    query.setParameter(3, cosClassAllocation.getCos1());
    query.setParameter(4, cosClassAllocation.getCos2V());
    query.setParameter(5, cosClassAllocation.getCos2());
    query.setParameter(6, cosClassAllocation.getCos3());
    query.setParameter(7, cosClassAllocation.getCos4());
    query.setParameter(8, cosClassAllocation.getCos5());
    return  findSingleOrNoItem(query, "Traffic_Profile", "cos_model = cos6, direction = " + direction.name() + " cos1 = " + cosClassAllocation.getCos1() 
            + " cos2v = " + cosClassAllocation.getCos2V() + " cos2 = " + cosClassAllocation.getCos2() 
            + " cos3 = " + cosClassAllocation.getCos3() + " cos4 = " + cosClassAllocation.getCos4()  + " cos5 = " + cosClassAllocation.getCos5()  );
}

Answer 1

假设您的ClassOfService6Allocations和ClassOfService4Allocations继承自ClassOfServiceAllocation，您可以在for循环中检查当前对象的类型，然后转换为此类，例如：

for(ClassOfServiceAllocation alloc : cosClassAllocation) {

    if (alloc instanceof ClassOfService6Allocations) {
        ClassOfService6Allocations alloc6 = (ClassOfService6Allocations) alloc;
        //set your parameters using the alloc6 object
    } else if (alloc instanceof ClassOfService4Allocations) {
        ClassOfService4Allocations alloc4 = (ClassOfService4Allocations) alloc;
        //set your parameters using the alloc4 object
    }

在我的java中返回findSingleOrNoItem（）中显示for循环

1 个答案: