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Difference between Key, Primary Key, Unique Key and Index in MySQL
... A primary key is a column, or a combination of columns, that can uniquely identify a row. It is a special case of unique key. A table can have at most one primary key, but more than one unique key. When you specify a unique key on a column, no two distinct rows in a table can have the same value.
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Making a property deserialize but not serialize with json.net
...es, but stopped it from serializing them.
– Daniel Saidi
Jun 23 '16 at 8:14
7
In conjunction with...
Can someone explain the traverse function in Haskell?
...onstructors are called in applicative style. This means that we can have (side-)effects while rebuilding the tree. Applicative is almost the same as monads, except that effects cannot depend on previous results. In this example it means that you could not do something different to the right branch o...
How to get the current taxonomy term ID (not the slug) in WordPress?
...hp page in my WordPress theme folder. I would like to get the current term id for a function.
How can I get this?
8 Answer...
Calculating sum of repeated elements in AngularJS ng-repeat
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one downside to this is that it iterates over the collection twice. this is fine for small collections, but what if the collection is rather large? it seems like in ng-repeat there should be a way to have a running sum on a given ob...
What's the best way to share data between activities?
...
Here a compilation of most common ways to achieve this:
Send data inside intent
Static fields
HashMap of WeakReferences
Persist objects (sqlite, share preferences, file, etc.)
TL;DR: there are two ways of sharing data: passing data in the intent's extras or saving it somewhere else. If data ...
Passing Parameters JavaFX FXML
...
class CustomerDialogController {
@FXML private Label customerName;
void initialize() {}
void initData(Customer customer) {
customerName.setText(customer.getName());
}
}
A new FXMLLoader is constructed as shown in the sample code i.e. new FXMLLoader(location). The location is a URL an...
KnockOutJS - Multiple ViewModels in a single View
... you bound to the masterVM. You can also use the "with" binding to help avoid the dot syntax when you dive into the sub view models.
– John Papa
Feb 15 '12 at 15:47
1
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Likelihood of collision using most significant bits of a UUID in Java
If I'm using Long uuid = UUID.randomUUID().getMostSignificantBits() how likely is it to get a collision. It cuts off the least significant bits, so there is a possibility that you run into a collision, right?
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How to read XML using XPath in Java
...xml version="1.0" encoding="UTF-8"?>
<Employees>
<Employee id="1">
<age>29</age>
<name>Pankaj</name>
<gender>Male</gender>
<role>Java Developer</role>
</Employee>
<Employee id="2">
...