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SQL Add foreign key to existing column
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MySQL / SQL Server / Oracle / MS Access:
ALTER TABLE Orders
ADD FOREIGN KEY (P_Id)
REFERENCES Persons(P_Id)
To allow naming of a FOREIGN KEY constraint, and for defining a FOREIGN KEY constraint on multiple columns, use the following SQL syntax:
MySQL / SQL Server / Oracle /...
How to wait for all threads to finish, using ExecutorService?
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I can't believe that you have to use shutdown in order to join on all the current threads (after using shutdown, you cannot use the executor again ever). Suggest using list of Future's instead...
– rogerdpack
Nov 2 '12 at 16:02
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How to write a Unit Test?
...it test for your project, please follow these steps (I am using Eclipse in order to write this test):
1- Click on New -> Java Project.
2- Write down your project name and click on finish.
3- Right click on your project. Then, click on New -> Class.
4- Write down your class name and c...
How to test if a string is basically an integer in quotes using Ruby
... String
def integer?
[ # In descending order of likeliness:
/^[-+]?[1-9]([0-9]*)?$/, # decimal
/^0[0-7]+$/, # octal
/^0x[0-9A-Fa-f]+$/, # hexadecimal
/^0b[01]+$/ # binary
].each do |match_pattern|...
What is default color for text in textview?
... Most correct solution. Preserve text color states (disabled, etc)
– dasar
Jan 11 '17 at 12:02
From my ob...
Asynchronously wait for Task to complete with timeout
...TokenSource.Cancel();
return await task; // Very important in order to propagate exceptions
} else {
throw new TimeoutException("The operation has timed out.");
}
}
}
share
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Trim trailing spaces in Xcode
...r to above, but running after the build
finished (including code signing etc).
Useful for additional packaging,
validity checking etc.
Pre/Post SCM Commit scripts.
To check project integrity.
Pre/Post File Save Script.
To check/alter a file before saving. E.g. run cody beautifiers
Cu...
Could not load file or assembly 'System.Web.Http 4.0.0 after update from 2012 to 2013
... Be sure to add the needed update to any dependent projects such as tests, etc.
– DeeArgee
Feb 9 '15 at 15:40
I did th...
Pros and cons of Java rules engines [closed]
...stablished algorithms (such as forward chaining and the Rete algorithm) in order to scale up to non-trivial problems. If you are simply evaluating expressions, an existing library such as MVEL may be useful.
– jevon
Feb 28 '11 at 6:19
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NSUserDefaults not cleared after app uninstall on simulator
...apabilities), then you will have to remove all the apps from the device in order for the user defaults to be cleared. Since the user defaults are shared, even if one of the app is on the device then it will not be deleted, as that app will be using the userdefaults.
– Ankit Sr...