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How to generate random SHA1 hash to use as ID in node.js?
...o create a HMAC-SHA1 hash?
I'd create a hash of the current timestamp + a random number to ensure hash uniqueness:
var current_date = (new Date()).valueOf().toString();
var random = Math.random().toString();
crypto.createHash('sha1').update(current_date + random).digest('hex');
...
How can we redirect a Java program console output to multiple files?
...
Go to run as and choose Run Configurations -> Common and in the Standard Input and Output you can choose a File also.
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Database, Table and Column Naming Conventions? [closed]
...s/releases/tag/adventureworks
The AdventureWorks sample uses a very clear and consistent naming convention that uses schema names for the organization of database objects.
Singular names for tables
Singular names for columns
Schema name for tables prefix (E.g.: SchemeName.TableName)
Pascal casing...
How to think in data stores instead of databases?
As an example, Google App Engine uses Google Datastore, not a standard database, to store data. Does anybody have any tips for using Google Datastore instead of databases? It seems I've trained my mind to think 100% in object relationships that map directly to table structures, and now it's hard t...
Multiple INSERT statements vs. single INSERT with multiple VALUES
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I thought I'd look into this a bit more though so set up a loop (script) and tried adjusting the number of VALUES clauses and recording the compile time.
I then divided the compile time by the number of rows to get the average compile time per clause. The results are below
Up until 250 VALUES ...
Cancel a UIView animation?
... is to create a new animation to your end point. Set a very short duration and make sure you use the +setAnimationBeginsFromCurrentState: method to start from the current state. When you set it to YES, the current animation is cut short. Looks something like this:
[UIView beginAnimations:nil contex...
Why do we need RESTful Web Services?
...ed if it is very important for you to minimize the coupling between client and server components in a distributed application.
This may be the case if your server is going to be used by many different clients that you do not have control over. It may also be the case if you want to be able to upda...
Unable to execute dex: GC overhead limit exceeded in Eclipse
When I downloaded the Git project OsmAnd and went to compile it,
Eclipse returned these errors:
9 Answers
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How do we control web page caching, across all browsers?
...he correct minimum set of headers that works across all mentioned clients (and proxies):
Cache-Control: no-cache, no-store, must-revalidate
Pragma: no-cache
Expires: 0
The Cache-Control is per the HTTP 1.1 spec for clients and proxies (and implicitly required by some clients next to Expires). The...
Explode PHP string by new line
...can use to make your code system independent, see this link to find useful and system independent directory constants.
Warning
These constants make your page system independent, but you might run into problems when moving from one system to another when you use the constants with data stored on an...