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Hidden features of Ruby
Continuing the "Hidden features of ..." meme, let's share the lesser-known but useful features of Ruby programming language.
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How can I delete a service in Windows?
...mmand prompt to execute the commands in this post):
SC STOP shortservicename
SC DELETE shortservicename
Note: You need to run the command prompt as an administrator, not just logged in as the administrator, but also with administrative rights. If you get errors above about not having the necess...
How to change column datatype in SQL database without losing data
...nto 1 (BIT = true).
ALTER TABLE dbo.YourTable
ALTER COLUMN YourColumnName BIT
The other option would be to create a new column of type BIT, fill it from the old column, and once you're done, drop the old column and rename the new one to the old name. That way, if something during the conversio...
Hash Map in Python
I want to implement a HashMap in Python. I want to ask a user for an input. depending on his input I am retrieving some information from the HashMap. If the user enters a key of the HashMap, I would like to retrieve the corresponding value.
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How to declare a variable in MySQL?
...lized, it has a value of NULL and a type of string.
SELECT @var_any_var_name
You can initialize a variable using SET or SELECT statement:
SET @start = 1, @finish = 10;
or
SELECT @start := 1, @finish := 10;
SELECT * FROM places WHERE place BETWEEN @start AND @finish;
User variables can...
SQL exclude a column using SELECT * [except columnA] FROM tableA?
...
I agree with everyone... but if I was going to do something like this I might do it this way:
/* Get the data into a temp table */
SELECT * INTO #TempTable
FROM YourTable
/* Drop the columns that are not needed */
ALTER TABLE #TempTable
DROP COLUMN ColumnToDrop
/* Get results...
When should I make explicit use of the `this` pointer?
When should I explicitly write this->member in a method of
a class?
12 Answers
12...
Catch browser's “zoom” event in JavaScript
...f there's a zoom. I found a good entry here on how you can attempt to implement it.
I’ve found two ways of detecting the
zoom level. One way to detect zoom
level changes relies on the fact that
percentage values are not zoomed. A
percentage value is relative to the
viewport width, and thus unaffe...
How to log a method's execution time exactly in milliseconds?
Is there a way to determine how much time a method needs to execute (in milliseconds)?
20 Answers
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Authorative way to override onMeasure()?
What's the correct way of overriding onMeasure()? I've seen various approaches. For example, Professional Android Development uses MeasureSpec to calculate the dimensions, then ends with a call to setMeasuredDimension(). For example:
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