java - 搜索条件不起作用

Question

我对对象标准有疑问。

I have 5 fields : SN(string), IP address(string), Site(string), Install Date(date), End Date(date).
I want to be able to combine fields to reduce the result.
For example if i have a device with serial number 1234 and ip 10.4.5
If I search serial number 1234, it return the device
If I search serial number 1234 and ip 10.4.5 it return the device
If I search serial number 1234 and ip 12.2.3 it doesn't return anything

我能够制作这个过滤器，但是当有 5 个字段时它不起作用。知道某些字段可以为空。

public List<IDevice> findByObject(Device device) {
    Criteria criteria = getSessionFactory().getCurrentSession()
        .createCriteria(Device.class);

    if (device.getSerialNumber() != null && 
        device.getSerialNumber().trim().length() > 0 && 
        device.getIpAdress() != null && 
        device.getIpAdress().trim().length() > 0 && 
        device.getOwner() != null && 
        device.getOwner().getSiteName().trim().length() > 0) {

        criteria.add(Restrictions.and(
            Restrictions.like("serialNumber", device.getSerialNumber()),
            Restrictions.like("installDate", device.getInstallDate()),
            Restrictions.like("ipAdress", device.getIpAdress())));

        criteria.createCriteria("owner")
            .add(Restrictions.and(Restrictions
                .like("siteName", device.getOwner().getSiteName())));
    }

    else if (device.getIpAdress() != null &&
             device.getIpAdress().trim().length() > 0 ) {

        criteria.add(Restrictions.like("ipAdress", device.getIpAdress()));
    }

    else if (device.getSerialNumber() != null &&
             device.getSerialNumber().trim().length() > 0 ) {

        criteria.add(Restrictions.like("serialNumber", device.getSerialNumber()));
    }

    else if (device.getOwner() != null && 
             device.getOwner().getSiteName() != null && 
             device.getOwner().getSiteName().trim().length() > 0) {

        criteria.createCriteria("owner")
             .add(Restrictions.like("siteName", device.getOwner().getSiteName()));
    }

    else if (device.getInstallDate() != null) {
        criteria.add(Restrictions.like("installDate", device.getInstallDate()));
    }
}

Answer 1

你几乎猜对了。取出 else if 中的 else

public List<IDevice> findByObject(Device device) {
    Criteria criteria = getSessionFactory().getCurrentSession().createCriteria(Device.class);

    if (device.getIpAdress() != null && device.getIpAdress().trim().length() > 0 ) {
        criteria.add(Restrictions.like("ipAdress", device.getIpAdress()));
    }
    if (device.getSerialNumber() != null && device.getSerialNumber().trim().length() > 0 ) {
        criteria.add(Restrictions.like("serialNumber", device.getSerialNumber()));
    }
    if (device.getOwner() != null && device.getOwner().getSiteName() != null && device.getOwner().getSiteName().trim().length() > 0) {
        criteria.createCriteria("owner").add(Restrictions.like("siteName", device.getOwner().getSiteName()));
    }
            if (device.getInstallDate() != null) {
                criteria.add(Restrictions.like("installDate", device.getInstallDate()));
            }

应该可以