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  • Should I implement IDisposable here?

    - by dotnetdev
    My method which calls SQL Server returns a datareader but because of what I need to do (return the datareader to the calling method which is in page code-behind), I can't close the connection in the class of the method which calls sql server, so I have no finally or using blocks. Is the correct way of disposing resources to make the class implement IDisposable? Or from the caller, explicitly dispose the unmanged resource (class-level fields)? Thanks

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  • does @@identity return the primary key or identity field?

    - by elspiko
    Hi, My issue is that I've got update triggers on an SQL View (MS SQL 2005) which I'm mapping to LINQ to SQL entities in C#... My SQL looks correct but it complains about trying to insert a null value into a secondary table PK field. I believe my issue relates to having the primary key and identity as seperate fields in the primary table. So my question is this....when using @@identity, does it look at the primary key of the inserted row, or does it look at the field with "IDENTITY" specified???

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  • 1:M relationship in Hibernate and cascading operations

    - by EugeneP
    Table SUBCOURSE references COURSE COURSE(id, name) SUBCOURSE(id, course_id, name) So, 1:M. Hibernate generates for Course: @OneToMany(fetch = FetchType.LAZY, mappedBy = "course", cascade = CascadeType.ALL) public Set getSubCourses() { return this.subCourses; } for Subcourse it generates @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "course_id", nullable = false) public Course getCourse() { return this.course; } Now the problem is that cascading does not work as expected. I want to create a collection of SubCourse objects (Set), fill it and then bind it to setSubCourses() of Course object. Though, having ManyToOne thing in a Subcourses table, I need to manually setCourse() before adding to collection on each object. If I do not do so, an exception is raised. What can you recommend me?

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  • Find query that caused update

    - by MadMax
    We have been having problems with ghost updates in our DB (SQL Server 2005) fields are changeing and we cannot find the routine that is updating. Is there a way using an update trigger (Or any other way) to tell what caused the update?

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  • Efficient implementation of exclusive execution

    - by n0weak
    I have an ObjectManager class that is used to process payments. It is wrapped over the Order entities, so new instance has to be created when processing is required. I need to prevent the situation when several ObjectManager instances are dealing with the same order simultaneously (it happend once because of some errors on the remote payment processing center, somehow they called our callback urls twice). I'd love to get an advice how to implement it more efficiently. For now, I am thinking about something like that: public class OrderManager{ private static final CopyOnWriteArrayList<Integer> LOCKER = new CopyOnWriteArrayList<Integer>(); private static synchronized boolean tryLock(Integer key) { return LOCKER.addIfAbsent(key); } private static void releaseLock(Integer key) { LOCKER.remove(key); } public void processPayment(Integer orderId) throws Exception{ if (!tryLock(orderId)) { return; } try { //operate } finally { releaseLock(orderId); } } //remainder omitted }

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  • Help in restructuring a project

    - by mrblah
    I have a commerce application, asp.net mvc. I want it to be extensible in the sense others can create other payment providers, as long as they adhere to the interfaces. /blah.core /blah.web /blah.Authorize.net (Implementation of a payment provider using interfaces Ipaymentconfig and paymentdata class) Now the problem is this: /blah.core - PaymentData /blah.core.interfaces - IPaymentConfig where Payment Data looks like: using blah.core; public class PaymentData { public Order Order {get;set;} } IPayment data contains classes from blah.core like the Order class. Now I want to use the actual Authorize.net implementation, so when I tried to reference it in the blah.core project I got a circular dependency error. How could I solve this problem? Many have said to break out the interfaces into their own project, but the problem is PaymentData references entities that are found in blah.core also, so there doesn't seem to be a way around this (in my head anyhow). How can I redesign this?

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  • AS3 - Can I have access to the object (or function) who call me?

    - by lk
    I've asked this same question with Python. Now I like to know if this can be done in AS3. If I have something like this: package { public class SomeClass { private function A():void { C() } private function B():void { C() } private function C():void { // who is the caller, A or B ??? } public function SomeClass() { A() B() } } } Despite the design or other issues, this is only a question of an inquiring mind. Note: This has to be done without changing C signature Note 2: I like to have an access to an instance of the caller function so I can call that caller function (if I want to)

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  • Will [WithEvents = Nothing] RemoveHandlers in the derived class?

    - by serhio
    I use to set WithEvents variables to Nothing in Destuctor, because this will "Remove" all the Handlers associated with Handles keyword. Will this have the same effect for derivated classes? Class A Protected WithEvents _Foo as Button Private Sub _Foo_Click Handles _Foo.Click ' ... some Click action ' End Sub Public Sub Dispose(disposing as Boolean) If disposing then _Foo = Nothing ' remove handler _Foo_Click ' End Sub End Class Class B Inherits A Private Sub _Foo_Move Handles _Foo.Move ' ... some Move action ' End Sub ' ????? will or NOT remove OR handler _Foo_Move the base Dispose??' Public Overrides Sub Dispose(disposing as Boolean) 'If disposing then _Foo = Nothing ' MyBase.Dispose(disposing) End Sub End Class

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  • MySQL database populated dropdown box and PHP search

    - by Sanel Bajric
    I have question regarding search on webpage with textbox and dropdown box. I have table with fields: ID First name Last name Company name Occupation Description Now i need to make search form which will be populated from database (field Occupation) and textbox where I can put whatever I want, and then get results from database based on those on web page. I am really sorry but i am totally begginer and only need some examples of such kind of code and much help :) Thank you

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  • Will the template argument's destructor to a templated class be called on deletion?

    - by Mutmansky
    If you have a templated base class as in the following example: class A{ A(); virtual ~A(); }; template <class T> class B : public T { B(); virtual ~B(); }; typedef B<A> C; class D : public C { D(); virtual ~D(); }; When you delete an instance of D, will the destructor of A be called? I'll probably create a test program to find out what happens, but just thinking about it, I wasn't sure what should happen.

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  • Dereferencing confusion? What is this example here called?

    - by perf
    Considering this PHP example: class A { public function getB( ) { return new B(); } } class B { public function test( ) { echo "Hello"; } } I could use this: $a = new A( ); $b = $a->getB( ); $b->test( ); // Hello Or this: $a = new A(); $a->getB( )->test( ); // Hello Taking a closer look at the second example... What is the name of this form of expression? Does this have something to do with dereferencing? In which programming languages is this available? What other forms of this exist?

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  • Language in mdi forms

    - by WFgo
    I have a problem with set lenguage to MDI forms. In my main form I have a menustrip and I use resource file for translate I wanted to know if I'm doing the right thing My code is this (Example): Public Class Main Public SNFrm As New SalesNote Private Sub SetLanguage() SNFrm.Text = My.Resources.... SNFrm.AcceptBtn.Text = My.Resources... End Sub Private Sub MenuSalesNote_Click(......) SNFrm = New SalesNote SNFrm.MdiParent = Me SNFrm.StartPosition = FormStartPosition.CenterScreen SNFrm.Show() End Sub End Class Then, in My SalesNote Form_Closing Event Main.SNFrm.Dispose() is this correctly? Help!

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  • WCF: Is there a way to return an object that is able to execute on the server?

    - by mafutrct
    Coming from a Java background, this is the way I'm thinking: The server provides an object to the client. This object should be able to execute on the server. Server: private string _S = "A"; public interface IFoo { void Bar(); } private class Foo : IFoo { void Bar() { _S = "B";} } public IFoo GetFoo() { return new Foo(); } Client: IFoo foo = serverChannel.GetFoo(); foo.Bar(); Is this possible? Or is my understanding wrong and this is not how it works in WCF? What would be a better design?

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  • How does CouchDB handle UTF-8?

    - by borghe
    I'm quite puzzled by CouchDB: if I send a PUT request with some JSON string fields encoded as UTF-8, the non 7 bit ASCII characters get converted to the "\uXXXX" escape sequence. Is there any way to tell it not to escape UNICODE?

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  • How to set value from other class

    - by Ram
    Its said that property should not be "Set" only and it should be "Get" as well. What should i do if I need to set value to a variable from some other class? The will keep changing so I cannot pass it through constructor. Shall I create a function for this as shown below? class A { public void SetValue() { b = new B(); b.SetTest(10); } } class B { int test; public void SetTest(int value) { test = value; } } What are the other alternatives?

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  • Simple C++ classes question

    - by Without me Its just Aweso
    Its been a long time since i've done C++ and I'm running into some trouble with classes referencing eachother. right now I have something like: a.h class a { public: a(); bool skeletonfunc(b temp); } ==================== b.h class b { public: b(); bool skeletonfunc(a temp); } since each one needs a reference to the other i've found I cant do a #include of eachother at the top or i end up in a weird loop of sorts with the includes. So how can I make it so that a can use b and vice versa with out making a cyclical #include problem. thanks!

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  • Is it possible in Java to implement something similar to Object.clone() ?

    - by devoured elysium
    The Object.clone() method in Java is pretty special, as instead of returning a copy of the object that is to be cloned with the Object type, it returns the correct Object type. This can be better described with the following code: class A extends Object { public A clone() { return super.clone(); //although Object.clone() is from the Object class //this super.clone() will return an A object! } } class B extends A { } public static void main(String[] args) { B = new B(); B.clone();//here, although we haven't defined a clone() method, the cloned //object return is of type B! } So, could anyone explain if possible if is there anyway to replicate what happens inside Object.clone()'s method?

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  • Bulk Update in MYSQl

    - by user351806
    I have a site which has client side and admin side. There is a table called account History. which contains fields like uid | accountBalance | PaymentStatus | Date. Now this table has to be updated every month for all the paid users and the table is bulk. So what is the best way to update the table every month.Do i need to select all the uid's and update.

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  • PHP Passing Data to a Specific Class? (Data Encapsulation)

    - by Adam184
    I've learned that OOP is all about data encapsulation, but what about passing data between classes that have nothing to do with each other (would the below example be worthy of using extends)? class Dog { private $secretVar; public function getSecretVar() { $this->secretVar = 'psst... only for rainbow!'; return $this->secretVar; } } class Rainbow { public function __construct(Dog $Dog) { print_r($Dog->getSecretVar()); } } $Dog = new Dog(); $Rainbow = new Rainbow($Dog); // ... classes that don't need the $secretVar How would you encapsulate $secretVar for only classes Dog and Rainbow? As of now, anyone can call getSecretVar(), and I'm having a hard time allowing that to happen as it seems to defeat the whole point of encapsulation.

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  • Android camera to take multiple photos

    - by user2975407
    problem.java public class problem extends Activity { ImageView iv; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.problem); iv=(ImageView) findViewById(R.id.imageView1); Button b=(Button) findViewById(R.id.button1); b.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent=new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); startActivityForResult(intent, 0); } }); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub super.onActivityResult(requestCode, resultCode, data); Bitmap bm=(Bitmap) data.getExtras().get("data"); iv.setImageBitmap(bm); } } From this code I can only take one photo and it displayed in the screen. **But I want to take more photos nearly 5 photos and display in the screen** Further I want to add these photos to MySQL database.please help me to do that.I am new to android

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