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SQLite - UPSERT *not* INSERT or REPLACE
...the table: ID, NAME, ROLE
BAD: This will insert or replace all columns with new values for ID=1:
INSERT OR REPLACE INTO Employee (id, name, role)
VALUES (1, 'John Foo', 'CEO');
BAD: This will insert or replace 2 of the columns... the NAME column will be set to NULL or the default value:
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What's wrong with nullable columns in composite primary keys?
ORACLE does not permit NULL values in any of the columns that comprise a primary key. It appears that the same is true of most other "enterprise-level" systems.
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How to fix corrupted git repository?
I tried cloning my repository which I keep on my Ubuntu one folder to a new machine and I got this:
14 Answers
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How to “perfectly” override a dict?
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You can write an object that behaves like a dict quite easily with ABCs (Abstract Base Classes) from the collections.abc module. It even tells you if you missed a method, so below is the minimal version that shuts the ABC up.
from co...
Should sorting logic be placed in the model, the view, or the controller? [closed]
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(Note: this quote and citation is taken from @dasblinkenlight's answer, but we disagree on our interpretation of it. read his post and make up your own mind).
According to MVC description,
A controller can send commands to its associated view ...
What is the yield keyword used for in C#?
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The yield keyword actually does quite a lot here.
The function returns an object that implements the IEnumerable<object> interface. If a calling function starts foreaching over this object, the function is called again until it "yields". This is syntac...
Why does this Java code compile?
In method or class scope, the line below compiles (with warning):
14 Answers
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Role-based access control (RBAC) vs. Claims-based access control (CBAC) in ASP.NET MVC
What are the main benefits of using CBAC vs. RBAC ? When is it better to use CBAC and when is it better to use RBAC?
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LINQ Single vs First
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If you're expecting a Single record, it's always good to be explicit in your code.
I know others have written why you use one or the other, but I thought I'd illustrate why you should NOT use one, when you mean the other.
Note: In my code, I will typically use F...
How to use Git and Dropbox together effectively?
Is it possible to use Git and Dropbox together effectively?
20 Answers
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