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Ubuntu rails install fails on zlib
I've just moved over to Ubuntu 8.10 as my dev box; it's my first serious foray into Linux as a daily-use OS, and I'm having a hard time getting Rails going. I have followed a number of tutorials which all seem to work fine, but when I try and use gem install or gem update on anything, I get an erro...
Difference between timestamps with/without time zone in PostgreSQL
... timestamp values stored differently in PostgreSQL when the data type is WITH TIME ZONE versus WITHOUT TIME ZONE ? Can the differences be illustrated with simple test cases?
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PHP json_decode() returns NULL with valid JSON?
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It could be the encoding of the special characters. You could ask json_last_error() to get definite information.
Update: The issue is solved, look at the "Solution" paragraph in the question.
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What exactly do “u” and “r” string flags do, and what are raw string literals?
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There's not really any "raw string"; there are raw string literals, which are exactly the string literals marked by an 'r' before the opening quote.
A "raw string literal" is a slightly different syntax for a string literal, in which a backslash, \, is taken as meaning "just a backs...
Hibernate, @SequenceGenerator and allocationSize
... know the default behaviour of Hibernate when using @SequenceGenerator - it increases real database sequence by one , multiple this value by 50 (default allocationSize value) - and then uses this value as entity ID.
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Why does string::compare return an int?
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First, the specification is that it will return a value less
than, equal to or greater than 0, not necessarily -1 or 1.
Secondly, return values are rvalues, subject to integral
promotion, so there's no point in returning anything smaller.
In C++ (as in C),...
Performance difference for control structures 'for' and 'foreach' in C#
... code snippet will give better performance? The below code segments were written in C#.
9 Answers
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what is reverse() in Django
...ead django code sometimes, I see in some templates reverse() . I am not quite sure what this is but it is used together with HttpResponseRedirect. How and when is this reverse() supposed to be used?
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MySQL: multiple tables or one table with many columns?
...time information is one-to-one (each user has one name and password), then it's probably better to have it one table, since it reduces the number of joins the database will need to do to retrieve results. I think some databases have a limit on the number of columns per table, but I wouldn't worry ab...
Developing GUIs in Python: Tkinter vs PyQt [closed]
...erious, especially as things you learn will translate directly to working with Qt in other languages too if you ever need to, and Qt is probably the best cross-platform interface toolkit available right now.
There are only two real (potential) disadvantages:
PyQt is only available under the GPL. ...