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What is SQL injection? [duplicate]
...I adhere to is to use parameterized stored procedures rather than building raw SQL in code.
Stored Procedure parameters don't get executed, making them safe in most cases.
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Learning WebGL and three.js [closed]
...ur goal is to create games, I think you'll benefit much from learning some raw WebGL first, even if you end up using a framework like Three.js to help you write your code later.
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At runtime, find all classes in a Java application that extend a base class
...
You could use ResolverUtil (raw source) from the Stripes Framework
if you need something simple and quick without refactoring any existing code.
Here's a simple example not having loaded any of the classes:
package test;
import java.util.Set;
import ...
How to pull a random record using Django's ORM?
...ust one query (assuming Postgres):
random_instance_or_none = Model.objects.raw('''
select * from {0} limit 1
offset floor(random() * (select count(*) from {0}))
'''.format(Model._meta.db_table)).first()
Be aware that this will raise an index error if the table is empty. Write yourself a mod...
Chaining multiple MapReduce jobs in Hadoop
...uture version will support Riffle annotations, but it works great now with raw MR JobConf jobs.
A variant on this is to not manage MR jobs by hand at all, but develop your application using the Cascading API. Then the JobConf and job chaining is handled internally via the Cascading planner and Flow...
Saving and Reading Bitmaps/Images from Internal memory in Android
...that you write it again, i suppose you have that image data as a bitmap or raw data in the form of byte-array. If you have bitmap, you can directly utilize the above functions. If you have it in the form of byte array, use this to convert it to bitmap Bitmap bitmap = BitmapFactory.decodeByteArray(bi...
Cannot ping AWS EC2 instance
... me.
But the following rule will work:
Type: All ICMP
Protocol: TCP
Port range: 0 - 65535
Source: Anywhere - 0.0.0.0/0
After doing this you will be able to ping other instances. You should see something like:
PING 10.0.0.15 (10.0.0.15): 56 data bytes
64 bytes from 10.0.0.14: icmp_seq=1 ttl=64 t...
What's the difference between SortedList and SortedDictionary?
...-+------------+------------------+
To roughly paraphrase, if you require raw performance SortedDictionary could be a better choice. If you require lesser memory overhead and indexed retrieval SortedList fits better. See this question for more on when to use which.
You can read more here, here, he...
Finding all possible permutations of a given string in python
... # everything to the right of step has not been swapped yet
for i in range(step, len(string)):
# copy the string (store as array)
string_copy = [character for character in string]
# swap the current index with the step
string_copy[step], string_copy[i] = strin...
Generating a unique machine id
...tants from machines. Finally, I ended up storing an encrypted copy of the raw data I used as input and made a closeEnough function so that I would accept a non-matching id if it only varied in 2 fields. I also include details about the processor and system harddrive in my hash because early on I ha...