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Why can't enum's constructor access static fields?
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The constructor is called before the static fields have all been initialized, because the static fields (including those representing the enum values) are initialized in textual order, and the enum values always come before the other fields. No...
background function in Python
...hem is. I've got a function that downloads the image needed and saves it locally. Right now it's run inline with the code that displays a message to the user, but that can sometimes take over 10 seconds for non-local images. Is there a way I could call this function when it's needed, but run it in ...
T-SQL stored procedure that accepts multiple Id values
Is there a graceful way to handle passing a list of ids as a parameter to a stored procedure?
6 Answers
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Static function variables in Swift
I'm trying to figure out how to declare a static variable scoped only locally to a function in Swift.
4 Answers
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Drop all tables whose names begin with a certain string
...lution may also delete tables created by SQL Server! My solution below avoids this and deletes tables in foreign key dependency order.
– Tony O'Hagan
Jul 19 '15 at 1:15
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Inserting data into a temporary table
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INSERT INTO #TempTable (ID, Date, Name)
SELECT id, date, name
FROM physical_table
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PostgreSQL Autoincrement
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Yes, SERIAL is the equivalent function.
CREATE TABLE foo (
id SERIAL,
bar varchar);
INSERT INTO foo (bar) values ('blah');
INSERT INTO foo (bar) values ('blah');
SELECT * FROM foo;
1,blah
2,blah
SERIAL is just a create table time macro around sequences. You can not alter SERIAL...
SQL Joins Vs SQL Subqueries (Performance)?
...vary. The speed will depend a lot on indexes (do you have indexes on both ID columns? That will help a lot...) among other things.
The only REAL way to tell with 100% certainty which is faster is to turn on performance tracking (IO Statistics is especially useful) and run them both. Make sure to...
How can I exclude some folders from my Eclipse project?
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Filters will hide resources from view, but they're still in the project.
If you create a project in another location you can create linked resources to the folders you want to include in your project.
For reference I posted another answer...
Why is there no Constant feature in Java?
...hat an object is immutable when accessed through a special kind of pointer called a const-pointer When in Java, in places where I'd normally want to return a const-pointer, I instead return a reference with an interface type containing only methods that shouldn't have side effects. Unfortunately, ...