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How to display the function, procedure, triggers source code in postgresql?
... Nice one :) I suggest using \df to find the name of your function, then \x for expanded output, then \df+ name_of_function
– Sam Watkins
Sep 3 '14 at 7:47
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Unicode equivalents for \w and \b in Java regular expressions?
...dge of the string.
A \b boundary means:
IF does follow word
THEN doesn't precede word
ELSIF doesn't follow word
THEN does precede word
And those are all defined perfectly straightforwardly as:
follows word is (?<=\w).
precedes word is (?=\w).
doesn’t follow word ...
How are GCC and g++ bootstrapped?
...++ compiler (CPre/Cfront, 1979-1983) were probably first implemented in C, then rewritten in C++.
When you compile GCC or any other self-hosting compiler, the full order of building is:
Build new version of GCC with existing C compiler
re-build new version of GCC with the one you just built
(opti...
onSaveInstanceState () and onRestoreInstanceState ()
...d correctly, this is what you are doing: From B you call startActivity(A). Then from A you call finish() to get back to B. Right? In that case Your first activity, B will not have been destroyed, and neither onCreate() nor onRestoreInstanceState() will be called. These methods are only called when n...
Differences between fork and exec
...lly do this whenever you try to run a program like find - the shell forks, then the child loads the find program into memory, setting up all command line arguments, standard I/O and so forth.
But they're not required to be used together. It's perfectly acceptable for a program to fork itself withou...
Typical AngularJS workflow and project structure (with Python Flask)
...Do people start with developing a client-side application in AngularJS and then hooking up the back-end to it?
6 Answers
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Using Regular Expressions to Extract a Value in Java
...a pattern was found in a given string...
if (m.find()) {
// ...then you can use group() methods.
System.out.println(m.group(0)); // whole matched expression
System.out.println(m.group(1)); // first expression from round brackets (Testing)
System.out.println(m.grou...
How can I add a column that doesn't allow nulls in a Postgresql database?
..., NOT NULL is enforced immediately, so must first add column, fill values, then add NOT NULL — as this answer does. (tested on postgres 9.6)
– Beni Cherniavsky-Paskin
Oct 29 '17 at 9:44
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Reverting single file in SVN to a particular revision
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How can I commit the reverted file then?
– marcio
Feb 29 '16 at 15:34
2
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SQL WHERE ID IN (id1, id2, …, idn)
...h might be to use another table to contain id values. This other table can then be inner joined on your TABLE to constrain returned rows. This will have the major advantage that you won't need dynamic SQL (problematic at the best of times), and you won't have an infinitely long IN clause.
You wou...