serialization

问题 I am having trouble understanding this comment from the Java serialization documentation: Array classes cannot declare an explicit serialVersionUID, so they always have the default computed value, but the requirement for matching serialVersionUID values is waived for array classes. Maybe I am unable to understand the obvious, however, I haven't figured why would I need to do this? 回答1: I think that the answer to your question is to read up on serialVersionUID. In particular, you often want to

问题 Let's say that I have these in my models.py : #models.py class Theme(models.Model): """An theme is an asset of multiple levels.""" adventure = models.ForeignKey(Adventure) offset = models.PositiveSmallIntegerField() finished = models.BooleanField(default=False) class Level(models.Model): """Abstract level representation""" theme = models.ForeignKey(Theme) offset = models.PositiveSmallIntegerField() finished = models.BooleanField(default=False) class Meta: abstract = True class PuzzleLevel

问题 I have a large CSV (~75 MB) of this kind: 1,3,4.1,5.4 -2,-4,-0.1,-11.3 ... And I store my data with this code (C style) : #include <iostream> #include <cstdio> #include <vector> int main() { int s; int x; float y; double z; std::vector<int> t; std::vector<int> u; std::vector<float> v; std::vector<double> w; if (std::FILE *f = std::fopen("data.csv", "r")) { while (std::fscanf(f, "%d,%d,%f,%lf", &s, &x, &y, &z) == 4) { t.push_back(s); u.push_back(x); v.push_back(y); w.push_back(z); } std:

问题 Here is the error I am receiving. I've looked everywhere for answers and I cannot figure out why anyone else isn't running into the same issue. The error happens when I'm retrieving a Proposal object from Hibernate which has a many-to-one constraint with User_Info on two properties, author and advisor. If needed I can provide the classes and hibernate configs. Just a note, I do implement isSerializeable and have empty constructors...I really appreciate any advice or help... Starting Jetty on

问题 I have a C# .NET application (kind of complex calculation app) in which the user inputs data and the processed information is saved into SQLite file using JSON serialization and EF. The same can be loaded into our application when required. The application undergoes lot of changes during development and the classes are also modified. So the previously saved serialized objects in SQLite file differs from the newer one. i want to provide a compatibilty for the old files so that it can be opened

问题 I have a C# .NET application (kind of complex calculation app) in which the user inputs data and the processed information is saved into SQLite file using JSON serialization and EF. The same can be loaded into our application when required. The application undergoes lot of changes during development and the classes are also modified. So the previously saved serialized objects in SQLite file differs from the newer one. i want to provide a compatibilty for the old files so that it can be opened

问题 I try to customize my jms serializer config and copy the xml config of SonataMediaBundle to my local config. The requests are in a Controller that extends FOSRestBundle in a Symfony 2.7.13 application with sonata-project bundles. My current issue is, that I have a very long execution time due to a pool of thousands queries. If I use the default serializer config of the sonataMediaBundle I only have one query. config.yml: jms_serializer: metadata: auto_detection: false directories: FOSUB:

问题 I have a code like Session["key"] = "value"; But it is considered as a bad practice according to Fortify SCA with the reason of "Non-Serializable Object Stored in Session". Screenshot as below: What is the best way to solve this? How to make the string "value" to be serializable? 回答1: I think it's a false positive. From Fortify document: In order for the session to be serialized correctly, all objects the application stores as session attributes must declare the [Serializable] attribute.

问题 I have two entities i serialized and send to client using spring framework 4.2.5 + jacksonjson 2.7.5. My entities are the following: @Entity @Table(name = "entrada") @JsonIdentityInfo(generator=ObjectIdGenerators.PropertyGenerator.class, property="idEntrada") public class EntradaTest implements Serializable { private static final long serialVersionUID = 1L; @Id @Column(name = "id_entrada", unique = true, nullable = false) private String idEntrada; @Column(nullable = false, length = 5) private

问题 Say I have defined a class myself and I defined a __repr__ method for it. I want to about convert it back to my object. I know that object serialization may be a good way of doing so (using the json module) but is there anyway I can use the built-in eval function to achieve this? 回答1: Write your __repr__() so it creates a valid Python expression for instantiating your object. class MyClass(object): def __init__(self, a, b): self.a = a self.b = b def __repr__(self): return "%s(%r, %r)" % (type