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How to step through Python code to help debug issues?
...ch are documented on the pdb page.
Some useful ones to remember are:
b: set a breakpoint
c: continue debugging until you hit a breakpoint
s: step through the code
n: to go to next line of code
l: list source code for the current file (default: 11 lines including the line being executed)
u: naviga...
Mysql - How to quit/exit from stored procedure
...IF <Some Error Condition> THEN
SIGNAL CUSTOM_EXCEPTION
SET MESSAGE_TEXT = 'Your Custom Error Message';
END IF;
Note SQLSTATE '45000' equates to "Unhandled user-defined exception condition". By default, this will produce an error code of 1644 (which has that same meaning)....
creating a random number using MYSQL
...t to a variable and use the variable if you have master slave replication. SET @r=FLOOR(RAND() * 401) + 100, then SELECT @r.
– Qian Chen
Mar 23 '16 at 6:55
3
...
Types in MySQL: BigInt(20) vs Int(20)
... |
+-------+------------------+------+-----+---------+-------+
1 row in set (0,00 sec)
mysql> INSERT INTO `test` (`id`) VALUES (401421228216);
ERROR 1264 (22003): Out of range value for column 'id' at row 1
mysql> SET sql_mode = '';
Query OK, 0 rows affected, 1 warning (0,00 sec)
mysql&g...
An example of how to use getopts in bash
...e case of unsupported option, : in the case of missing value.
OPTARG - is set to current argument value,
OPTERR - indicates if Bash should display error messages.
So the code can be:
#!/usr/bin/env bash
usage() { echo "$0 usage:" && grep " .)\ #" $0; exit 0; }
[ $# -eq 0 ] && usa...
phpinfo() - is there an easy way for seeing it?
...
@JamesHalsall If you need to emulate the PHP settings that your web server is using, that's the proper way to do it. Otherwise you're either erroneously using the CLI settings, or you're removing the separation between CLI settings and web server settings. That separati...
Remove leading or trailing spaces in an entire column of data
...k 'Text to columns' from the 'Data' tab, then choose option 'Fixed width'.
Set a break line so the longest text will fit. If your largest cell
has 100 characters you can set the breakline on 200 or whatever you
want.
Finish the operation.
You can now delete the new column Excel has created.
The 's...
Graph Algorithm To Find All Connections Between Two Arbitrary Vertices
...ough.
Graph.java:
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.Map;
import java.util.Set;
public class Graph {
private Map<String, LinkedHashSet<String>> map = new HashMap();
public void addEdge(String node1, String...
.prop('checked',false) or .removeAttr('checked')?
...
jQuery 3
As of jQuery 3, removeAttr does not set the corresponding property to false anymore:
Prior to jQuery 3.0, using .removeAttr() on a boolean attribute such as checked, selected, or readonly would also set the corresponding named property to false. This behavior ...
How to disable code formatting for some part of the code using comments?
...Preferences > Editor > Code Style
IntelliJ IDEA v.2018+:
File > Settings > Editor > Code Style
You can change the formatter control markers, as long as they're in comments.
Ensure formatter markers in comments are enabled, as shown in the following figure:
...