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How to set a default value for a datetime column to record creation time in a migration?
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See discussion at https://github.com/rails/rails/issues/27077 and answer there by prathamesh-sonpatki
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Hash String via SHA-256 in Java
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import java.security.NoSuchAlgorithmException;
import java.nio.charset.StandardCharsets;
import java.math.BigInteger;
public class CryptoHash {
public static void main(String[] args) throws NoSuchAlgorithmException {
MessageDigest md = MessageDigest.getInstance("SHA-256");
String text =...
How to create relationships in MySQL
In class, we are all 'studying' databases, and everyone is using Access. Bored with this, I am trying to do what the rest of the class is doing, but with raw SQL commands with MySQL instead of using Access.
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How to change the Text color of Menu item in Android?
Can I change the background color of a Menu item in Android?
27 Answers
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Computed / calculated / virtual / derived columns in PostgreSQL
... Postgres 11 generated columns are not supported - as defined in the SQL standard and implemented by some RDBMS including DB2, MySQL and Oracle. Nor the similar "computed columns" of SQL Server.
STORED generated columns are introduced with Postgres 12. Trivial example:
CREATE TABLE tbl (
int1 ...
Android encryption / decryption using AES [closed]
Is there a good example of how to encrypt and decrypt image and other files with AES on Android?
11 Answers
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Multiple arguments vs. options object
...gLength(inputStr, 10);
I think that code is quite readable the way it is and passing individual parameters is just fine.
On the other hand, there are functions with calls like this:
initiateTransferProtocol("http", false, 150, 90, null, true, 18);
Completely unreadable unless you do some resea...
What is the command to list the available avdnames
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AFAIK android list avd avdmanager list avd is what you need.
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How to set up tmux so that it starts up with specified windows opened?
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@AhmadYoosofan, The vim there stands for the command that is to be executed in the first (and at that time only) pane of the window. If you instead want to name the session 'vim' then yes, you're right, you got to use the -s flag. Whole syntax: tmux new-se...
What is meant by the term “hook” in programming?
...Would someone be able to give me an idea of what this term generally means and perhaps a small example to illustrate the definition?
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