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Do I need to create indexes on foreign keys on Oracle?
...A and a table B . A has a foreign key to B on B 's primary key, B_ID .
7 Answers
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How to resume Fragment from BackStack if exists
...is a way to pop the back stack based on either the transaction name or the id provided by commit. Using the name may be easier since it shouldn't require keeping track of a number that may change and reinforces the "unique back stack entry" logic.
Since you want only one back stack entry per Fragme...
Difference between RegisterStartupScript and RegisterClientScriptBlock?
...Script method:
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1"><title></title></head>
<body>
<form name="form1" method="post" action="StartupScript.aspx" id="form1">
<div>
<input type="hidden" name="__VIEWSTATE"...
Show/hide 'div' using JavaScript
For a website I'm doing, I want to load one div, and hide another, then have two buttons that will toggle views between the div using JavaScript.
...
Why would one use nested classes in C++?
...
Nested classes are cool for hiding implementation details.
List:
class List
{
public:
List(): head(nullptr), tail(nullptr) {}
private:
class Node
{
public:
int data;
No...
How do I use variables in Oracle SQL Developer?
...
I am using the SQL-Developer in Version 3.2. The other stuff didn't work for me, but this did:
define value1 = 'sysdate'
SELECT &&value1 from dual;
Also it's the slickest way presented here, yet.
(If you omit the "define"-part you'll be prompted for that value)
...
Add a column to a table, if it does not already exist
...bjects.
IF NOT EXISTS (
SELECT *
FROM sys.columns
WHERE object_id = OBJECT_ID(N'[dbo].[Person]')
AND name = 'ColumnName'
)
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.NET unique object identifier
Is there a way of getting a unique identifier of an instance?
11 Answers
11
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Design for Facebook authentication in an iOS app that also accesses a secured web service
... to register for an account with you entirely separate from their Facebook ID, right? Then some other time they log in with Facebook.... And you just created them a second account and lost their first one.
There needs to be a way to be logged in to your web service, then log in to facebook, and ca...
ObservableCollection not noticing when Item in it changes (even with INotifyPropertyChanged)
...he ContentList's Set method will not get called when you change a value inside the collection, instead you should be looking out for the CollectionChanged event firing.
public class CollectionViewModel : ViewModelBase
{
public ObservableCollection<EntityViewModel> ContentList
...