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Ways to save enums in database
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We never store enumerations as numerical ordinal values anymore; it makes debugging and support way too difficult. We store the actual enumeration value converted to string:
public enum Suit { Spade, Heart, Diamond, Club }
Suit theSuit = Suit.Heart;
szQuery = "INSERT INTO Customers (Name, Su...
Collapse sequences of white space into a single character and trim string
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Georg SchöllyGeorg Schölly
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How can I format a nullable DateTime with ToString()?
..."yyyy-MM-dd hh:mm:ss") : "n/a");
EDIT: As stated in other comments, check that there is a non-null value.
Update: as recommended in the comments, extension method:
public static string ToString(this DateTime? dt, string format)
=> dt == null ? "n/a" : ((DateTime)dt).ToString(format);
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How to find duplicates in 2 columns not 1
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You should set up a composite key between the two fields. This will require a unique stone_id and upcharge_title for each row.
As far as finding the existing duplicates try this:
select stone_id,
upcharge_title,
count(*)
from yo...
Using lambda expressions for event handlers
...t the compiler translates into the exact same code that you are used to working with.
The compiler will convert the code you have to something like this:
public partial class MyPage : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//snip
MyButto...
Viewing contents of a .jar file
...t way to view classes, methods, properties, etc. inside a jar file?
I'm looking for something equivalent to the very useful Lutz Roeder .NET Reflector - for Java
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WebClient vs. HttpWebRequest/HttpWebResponse
...Using HttpWebRequest gives you more control on the request. You can set cookies, headers, protocol, etc... In the response, you can also retrieve the cookies and headers
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android layout: This tag and its children can be replaced by one and a compound drawable
...answered Jan 13 '12 at 22:43
NPikeNPike
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[ :Unexpected operator in shell programming [duplicate]
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There is no mistake in your bash script. But you are executing it with sh which has a less extensive syntax ;)
So, run bash ./choose.sh instead :)
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Skip List vs. Binary Search Tree
I recently came across the data structure known as a skip list . It seems to have very similar behavior to a binary search tree.
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