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How to get multiple counts with one SQL query?
...method works just as nicely if you're combining lots of tables together in one query, as using sub-queries can get quite messy in that instance.
– Darren Crabb
Oct 8 '15 at 11:24
7...
to drawRect or not to drawRect (when should one use drawRect/Core Graphics vs subviews/images and wh
...using drawRect. I'm trying to fully understand the when's and why's to use one over the other.
4 Answers
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Regular expression to allow spaces between words
... that * means zero or more, it would match all of the following cases that one would not usually mean to match:
An empty string, "".
A string comprised entirely of spaces, " ".
A string that leads and / or trails with spaces, " Hello World ".
A string that contains multiple spac...
What is the best Distributed Brute Force countermeasure?
...m winning (so to speak). But I've run into a pretty non-trivial challenge (one that most auth libraries miss entirely, but I insist on handling it properly): how to deal intelligently with large-scale, distributed, variable-username brute-force attacks .
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String is immutable. What exactly is the meaning? [duplicate]
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At this point in the example above, we have two String objects: the first one we created with value "knowledge", pointed to by s, and the second one "knowledge base", pointed to by str. But, technically, we have three String objects, the third one being the literal "base" in the concat statement.
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Reference: Comparing PHP's print and echo
...ZEND_ECHO_SPEC_CONST_HANDLER" will be invoked. The handler for print does one thing before it invokes the handler for echo, it makes sure that the return value for print is 1, as follows:
ZVAL_LONG(&EX_T(opline->result.var).tmp_var, 1);
(see here for reference)
The return value is a conv...
What are the effects of exceptions on performance in Java?
...ns for try at all in general - everything that needs to happen is already done when the class is loaded by the VM) and it makes throw not quite as slow. I don't know which JVM uses this new, better technique...
...but are you writing in Java so your code later on only runs on one JVM on one specif...
What is the difference between & vs @ and = in angularJS
...ing with embedded expressions (myattr="my_{{helloText}}"). Think of it as "one-way" communication from the parent scope into the child directive. John Lindquist has a series of short screencasts explaining each of these. Screencast on @ is here: https://egghead.io/lessons/angularjs-isolate-scope-a...
How to set a default value for an existing column
...+1 for specifying a constraint name, so SQL Server doesn't create a random one.
– HardCode
Jul 22 '11 at 15:25
38
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Catch multiple exceptions in one line (except block)
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How do I catch multiple exceptions in one line (except block)
Do this:
try:
may_raise_specific_errors():
except (SpecificErrorOne, SpecificErrorTwo) as error:
handle(error) # might log or have some other default behavior...
The parentheses are requir...