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What's is the difference between include and extend in use case diagram?
...when certain criteria are met.
a typical example: between login and show error message (only happened sometimes)
(login) <--- << extend >> --- (show error message)
"show error message" only happens sometimes when the login process failed.
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MySQL, better to insert NULL or empty string?
... person with no DL No. will get added but not the next as it will throw an error of unique constraint. So, NULL is better.
– Saifur Rahman Mohsin
Feb 22 '16 at 10:29
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Can't connect to local MySQL server through socket '/tmp/mysql.sock
...to connect to a local MySQL server during my test suite, it
fails with the error:
32 Answers
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What's wrong with overridable method calls in constructors?
...e method gets the wrong value. This will almost certainly lead to bugs and errors.
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Running a specific test case in Django when your app has a tests directory
... Attention people like me who blindly paste from Stackoverflow: This will error without the mentioned plugin, use the syntax described in the other answer (. instead of :) which works in Django 1.6+.
– Andy Smith
Oct 8 '16 at 11:11
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How does Go compile so quickly?
...rd to prevent the parser from ever being the piece of code that reports an error. Parsers generally do a poor job of reporting coherent error messages. Here, you create a parse tree for the expression as though aType is a variable reference, and later in the semantic analysis phase when you find out...
Unable to Cast from Parent Class to Child Class
... Derived fail = (Derived)baseInstance; This compiles without any error in .NET 3.5. Where is the problem you are saying?
– pradeeptp
Jan 15 '10 at 5:02
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How do I find out my python path using python?
...try:
user_paths = os.environ['PYTHONPATH'].split(os.pathsep)
except KeyError:
user_paths = []
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Create web service proxy in Visual Studio from a WSDL file
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Using WSDL.exe didn't work for me (gave me an error about a missing type), but I was able to right-click on my project in VS and select "Add Service Reference." I entered the path to the wsdl file in the Address field and hit "Go." That seemed to be able to find all the ...
Insert auto increment primary key to existing table
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For those like myself getting a Multiple primary key defined error try:
ALTER TABLE `myTable` ADD COLUMN `id` INT AUTO_INCREMENT UNIQUE FIRST NOT NULL;
On MySQL v5.5.31 this set the id column as the primary key for me and populated each row with an incrementing value.
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