serialization

问题 In R, Int64 whole numbers can not be accurately serialized to and from JSON, because existing JSON libraries will coerce the value into a numeric, or expect to represent the number in scientific notation. Does anyone know of a way to accurately serialize and deserialize whole Int64 numbers to/from JSON with precision, or is a library modification (probably to RJSONIO) required? The full story, including libraries I have tried so far, and the gacky workarounds necessary for the interim: >

问题 I have... /app/models/search.rb : serialize :result def multisearch self.result = PgSearch.multisearch(self.term) self.status = "closed" self.save return result end /db/schema.rb : create_table "searches", :force => true do |t| t.string "term" t.string "status" t.text "result" end I get the following error when I try `self.save? ArgumentError: wrong number of arguments (2 for 1) from /Users/steven/.rvm/gems/ruby-1.9.2-p320/gems/arel-3.0.2/lib/arel/expressions.rb:3:in `count' I get a similar

问题 I'm currently implementing parsing of JSON to POJO. My Model class looks like this: public class InvoiceModel { @JsonDeserialize(using=MeteorDateDeserializer.class) Date date; String userId; String customerName; ArrayList<PaymentModel> payments; [...getters, setters...] } a JSON string could look like this: { "date": { "$date": 1453812396858 }, "userId": "igxL4tNwR58xuuJbE", "customerName": "S04", "payments": [ { "value": 653.5, "paymentMethod": "Cash", "userId": "igxL4tNwR58xuuJbE", "date":

问题 As for the subject title: Why is it legal to declare a transient variable in a non serializable class? What would the use be? 回答1: The transient access modifier can be seen by code other than the serialization mechanism, and is used by some object databases to mark a data field as not persistent. Aside from that, there isn't any harm in allowing this. 回答2: Because also other serialization forms that don't requirier Serializable are able to make use of it too. 回答3: How about if a subclass

问题 I have an activity which has an object of type mqttQndroidClient . this object i would like to pass it to another activity. To achieve this i read about how to solve such issue and the soltion i found was to create a class that implements serializable as shown below, and i did the following: client = new mqttAndroidClient(..,...,..,..,); Intent i = new Intent(act_1.this, act_2.class) clientObject = clientObj = new (CLIENT_OBJ_KEY, client); Bundle b = new Bundle(); b.putSerializable(CLIENT_OBJ

问题 I know how to implement JsonDeserializer and JsonSerializer, but here is what I want to do: This is the setup: public class classA { public String a; public classB clazzB; } public class classB { public String c; public String d; public String e; public String f; } I want to serialize (and deserialize analog to this) classA like this: when serializing classA it should serialize a part of classB with it aswell, say variables c and d Since I know how to do that (using transient for e and f)

问题 I have got a small class that I would like to use for serializing structs. I would like to know two things: Performance issue. Since I am passing Object - it passes just a reference, not a copy of the struct? And since I am returning object of type T it also only passes a reference? Correctness issue. Will this serialization work for all structs? I mean - is there a possibility where those methods will not work? public static byte[] ToByteArray(Object obj) { int size = Marshal.SizeOf(obj);

问题 I'm developing an e-learning in Rails and I want to save a set of Arrays to the database, with the aim of tracking a user's progress through the various sections of the e-learning. I've come across this question and answer: Storing arrays in database : JSON vs. serialized array ...which sounds like it might be useful, but I can't figure out how to integrate it into the Rails project I'm developing. Given that I'm pretty much a Rails noob, could someone explain to me, in plain English (or

问题 I want to save object state and reuse it after some time. I got some example on How to save object (Pickle module), I was not able to find how to resume class/method from the save state and proceed further. Like game, we can save the game and latter we can continue, I know in game we save all the data and game read the data and build the game. I want to save complete object and when I restore it it start working from saved state. For example class Test(objet): def doSomeWork(self): index = 0

问题 I would like to serialize and deserialize mixed data into XML. After some searches I found out that there were two ways of doing it: System.Runtime.Serialization.Formatters.Soap.SoapFormatter and System.Xml.Serialization.XmlSerializer . However, neither turned out to match my requirements, since: SoapFormatter doesn't support serialization of generic types XmlSerializer refuses to serialize types that implement IDictionary , not to mention that it's far less easy-to-use than "normal"