How to save many objects in a spring

How to save many objects in a spring

@[email protected]@Table(name="menu")@Configurablepublic class Menu implements Serializable{ .... @OneToMany(mappedBy="menu", fetch=FetchType.EAGER) private Set voceMenuList; public Set getVoceMenuList() { r

How to handle spill memory in pig

How to handle spill memory in pig

My code like like this:pymt = LOAD 'pymt' USING PigStorage('|') AS ($pymt_schema);pymt_grp = GROUP pymt BY keyresults = FOREACH pymt_grp { /* * some kind of logic, filter, count, distinct, sum, etc. */}But now I find many

How to use elasticsearch to get JOIN functionality as in SQL?

How to use elasticsearch to get JOIN functionality as in SQL?

I have an SQL query that does JOIN operations over 3-4 tables to get the data. Now we are shifting to elasticsearch for better performance. How can I replicate the same JOIN query using elasticsearch? I have read about parent/child document

Export csv spits out length only

Export csv spits out length only

I can only get the length when exporting this to csv, how should it be done properly.$redo = Import-CSV c:\temp\testimport.txt | Group-Object email |foreach { "{0} ,{1}" -f $_.Name, (($_.Group | foreach { $_.group }) -join ', ')}$redo | Ex

Is there a difference between “== False” and “is not” when checking for an empty string?

Is there a difference between “== False” and “is not” when checking for an empty string?

I have read elsewhere on stackoverflow that the most elegant way to check for an empty string in Python (e.g. let's say it's a string called response) is to do:if not response: # do some stuff The reason being that strings can evaluate t

Why can not I add an object of type Object into a List?

Why can not I add an object of type Object into a List?

As far as I understand a List is definds as a list of some specific , yet unknown type . So whatever is the parameter type of this List, it should be extending Object because in Java you can not have any type that doesn't extend Object. So

NSPredicate for range between two dates is not working as expected

NSPredicate for range between two dates is not working as expected

I have these two NSDates:NSDateFormatter *df = [[NSDateFormatter alloc] init];[df setDateFormat:@"MM/dd/yyyy"];NSDate *rangeStart = [df dateFromString: @"03/03/2013"];NSDate *rangeEnd = [df dateFromString: @"10/04/2013"];And this predicate:

C++: why it doesn't call a destructor?

C++: why it doesn't call a destructor?

I use extra brackets in my code. I thought when the destructor should be called after the local variable scope is ended but it doesn't work like this:class TestClass {public: TestClass() { printf( "TestClass()\n" ); } ~TestC

Why does Code Analysis tell me, “Do not dispose objects multiple times” here:

Why does Code Analysis tell me, “Do not dispose objects multiple times” here:

On this code:public static string Base64FromFileName(string fileName){ try { FileInfo fInfo = new FileInfo(fileName); long numBytes = fInfo.Length; FileStream fStream = new FileStream(fileName, FileMode.Open, File

F-bounded quantification through type member instead of type parameter?

F-bounded quantification through type member instead of type parameter?

I would like to move a type parameter to a type member.This is the starting point which works:trait Sys[S What annoys me is that I'm carrying around a type parameter [S throughout my entire libraries. So what I was thinking is this:trait S

Using Iterators to hide internal container and achieve generic operation over a base container

Using Iterators to hide internal container and achieve generic operation over a base container

I basically want to have a base container class which can return a generic iterator that can be used to traverse an instance of the container class, without needing to specify iterator templates. I think I cannot implement the base containe

Why wait ,notify and notifyAll Methods are in Object Class?

Why wait ,notify and notifyAll Methods are in Object Class?

i know that wait() method always written in synchronized method/block and make lock on Object but i want to only know that what problem is arise at that time when this all methods are in Thread class ? 1:They are also in the Thread clas

Django slice a single field in a queryset

Django slice a single field in a queryset

I am trying to grab the first five characters from a char field but for only one field in a queryset but I keep getting various errors. Is there an effective way to do this in the view?Code I am trying:var = Model.objects.values('field1', '

Running code only after an object is updated in IndexedDB (particularly in Chrome)

Running code only after an object is updated in IndexedDB (particularly in Chrome)

I feel like this is a pretty mundane thing to do. I want to update an object in an IndexedDB database and then run some code after which uses the updated values.What I originally did was just run my callback function after calling cursor.up

IndexedDB: Retrieve item with max value

IndexedDB: Retrieve item with max value

Suppose I have an IndexedDB collection with name items. All items have fields:idnamerevisionrevision field is a number field. I need to retrieve an item with max value of revision (or at least just retrive max revision value). What is the b

Editing related objects in ModelFormSet

Editing related objects in ModelFormSet

I have these Models:class Gallery(models.Model): HeadImage = models.ImageField(upload_to="gallery")class Image(models.Model): Image = models.ImageField(upload_to="gallery") Gallery = models.ForeignKey(Gallery, related_name='images')cl

Three.js buffergeometry disappears after moving camera to close

Three.js buffergeometry disappears after moving camera to close

My buffergeometry disappears after moving the camera to close. You can also see that in drawcalls Three.js example that has TrackballControls. In my case it's alot worser. My points disappear at the distance from 0 to 400 and my lines disap

Guice and RequestScoped behaviour in multiple threads

Guice and RequestScoped behaviour in multiple threads

I am using Guice's RequestScoped and Provider in order to get instances of some classes during a user request. This works fine currently. Now I want to do some job in a background thread, using the same instances created during request.Howe

Rules for Jersey to parse JSON/ Jackson Subtype deserialisation

Rules for Jersey to parse JSON/ Jackson Subtype deserialisation

I receive JSONs the way:@[email protected]("log")public Map> log(Stats stats) { ..}The examples of JSONs:{ "eventType": 1 "params": { "field1" : 10 }}{ "eventType": 2 "params": { "field2" : "ten" }}I have a class structure (they are g

Xcode - Command /Developer/usr/bin/clang failed with exit code 1

Xcode - Command /Developer/usr/bin/clang failed with exit code 1

I'm just starting programming, and trying to learn C. For my homework I had to design a program, and I'm pretty sure my code is right, but whenever I try to test it, or even try programs directly from the book, I get this error.Ld "/Users/B

Angular - UI.Router not loading component

Angular - UI.Router not loading component

I am unable to get ui.router to load a component on index.html, through a localhost or otherwise:index.html components.js var app = angular.module('myApp', ['ui.router']); //makes a call to the Angula

Django rest framework permission_classes of ViewSet method

Django rest framework permission_classes of ViewSet method

I'm writing a rest API with the Django REST framework, and I'd like to protect certain endpoints with permissions. The permission classes look like they provide an elegant way to accomplish this. My problem is that I'd like to use different

core data: [NSFetchedResultsController -fetchedObjects], will this method reflect object change?

core data: [NSFetchedResultsController -fetchedObjects], will this method reflect object change?

first I create a NSFetchedResultsController with a NSFetchRequest that fetches all object of entity "Entity".and then I insert an new NSManagedObject A ,which is an instance of "Entity", and Edit B, which is also an instance of "Entity".th

Deserialize the JSON where the values are field names with JSON.NET

Deserialize the JSON where the values are field names with JSON.NET

I have a very undesirable situation which requires me to deserialize the JSON where the values are field names with JSON.NET. Assuming that I have the following JSON which is very properly structured:{ "name": "tugberk", "roles": [

“Poor Man's Reflection” (AKA bottom-up reflection) in C++

“Poor Man's Reflection” (AKA bottom-up reflection) in C++

I am implementing some rudimentary reflection in C++ for an ultra modular architecture where virtually all features are loaded as plugins and interpreted dynamically at run-time. Since there's a distinct element of structural self-organizat