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SQL command to display history of queries
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For MySQL > 5.1.11 or MariaDB
SET GLOBAL log_output = 'TABLE';
SET GLOBAL general_log = 'ON';
Take a look at the table mysql.general_log
If you want to output to a log file:
SET GLOBAL log_output = "FILE";
SET GLOBAL general_log_file = "/path/to/your/logfile.log"
SET GLOBAL g...
How to convert char to int?
...appens.
A Char, is basically an integer, but with a pointer in the ASCII table. All characters have a corresponding integer value as you can clearly see when trying to parse it.
Pranay has clearly a different character set, thats why HIS code doesnt work.
the only way is
int val = '1' - '0';
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Replacement for deprecated sizeWithFont: in iOS 7?
...n the main thread (like any other UIKit functionality), you'll get unpredictable behaviors. In particular, if you ran the function on multiple threads simultaneously, it'll probably crash your app. This is why in iOS 6, they introduced a the boundingRectWithSize:... method for NSAttributedString. ...
How to show SQL queries run in the Rails console?
...lain
=> EXPLAIN for: SELECT "categories".* FROM "categories" 0|0|0|SCAN TABLE categories
EXPLAIN for: SELECT "categories_products".* FROM "categories_products" WHERE "categories_products"."category_id" IN (1, 2) 0|0|0|SCAN TABLE categories_products
EXPLAIN for: SELECT "products".* FROM "product...
How to convert local time string to UTC?
... platform. You could use tzlocal.get_localzone() to provide tzdata in a portable way. (2) fromtimestamp(t, tz) may fail for non-pytz timezones. (3) datetime(*struct_time[:6]) you are missing *. (4) timegm(), utctimetuple(), struct_time -based solutions drop fractions of a second. You could use an e...
Comparing date ranges
... |-----| equal start with end of comparison period
If your table has columns called range_end and range_start, here's some simple SQL to retrieve all the matching rows:
SELECT *
FROM periods
WHERE NOT (range_start > @check_period_end
OR range_end < @check_period_s...
Create PostgreSQL ROLE (user) if it doesn't exist
... and improved with @Gregory's comment.)
Unlike, for instance, with CREATE TABLE there is no IF NOT EXISTS clause for CREATE ROLE (up to at least pg 12). And you cannot execute dynamic DDL statements in plain SQL.
Your request to "avoid PL/pgSQL" is impossible except by using another PL. The DO sta...
Worst security hole you've seen? [closed]
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little Bobby tables strikes again... xkcd.com/327
– gbjbaanb
Oct 7 '09 at 12:21
86
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Detect if an input has text in it using CSS — on a page I am visiting and do not control?
...r spec
The Mozilla/Firefox supported selectors
Cross-browser, CSS3 support table
The :empty selector refers only to child nodes, not input values.
[value=""] does work; but only for the initial state. This is because a node's value attribute (that CSS sees), is not the same as the node's value pr...
How does the socket API accept() function work?
...g on the Server IP maintains a database (meaning I don't care what kind of table/list/tree/array/magic data structure it uses) of active sockets and listens on the Server Port. When it receives a message (via the server's TCP/IP stack), it checks the Client IP and Port against the database. If the...