Redis difference in the condition and unless the

1. The difference between the condition and unless annotated, condition of the incoming values to take effect, unless the results of result into effect, using the wrong result reported to cause empty error
2.key key generation strategy, methods, tools can no longer key to call directly, the method of writing in the same class, use # root.target.methodName (# p0.attributeName) operation attribute values, the best solution: use an object custom key strategy, with the parameters into operation, return key
3. when comparing properties with nULL, null EDITORIAL, null eq object