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What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
... @ariel The 'correct' way is to get all the wheels, ordered by CarId (1 select), and if more details than the CarId are required, make a second query for all cars (2 queries total). Printing things out is now optimal, and no indexes or secondary storage were required (you can iterate ...
How to set value of input text using jQuery
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Using jQuery, we can use the following code:
Select by input name:
$('input[name="textboxname"]').val('some value')
Select by input class:
$('input[type=text].textboxclass').val('some value')
Select by input id:
$('#textboxid').val('some value')
...
What is a StoryBoard ID and how can i use this?
...e storyboard knows which view controller is which.
Now, don't be confused by the name. A storyboard ID doesn't identify a 'storyboard'. A storyboard, according to Apple's documentation, 'represents the view controllers for all or part of your app’s user interface.' So, when you have something lik...
Place cursor at the end of text in EditText
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Try this:
EditText et = (EditText)findViewById(R.id.inbox);
et.setSelection(et.getText().length());
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How do I sort a list by different parameters at different timed
..., a positive one if o1 is greater, and zero if they are equal. Multiplying by -1 reverses the result, which is the idea of decending (the opposite of the usual ascending order), while leaving it as zero if they were equal.
– Yishai
Dec 4 '13 at 14:05
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Drop all tables whose names begin with a certain string
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Warning: This solution may also delete tables created by SQL Server! My solution below avoids this and deletes tables in foreign key dependency order.
– Tony O'Hagan
Jul 19 '15 at 1:15
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Can Selenium interact with an existing browser session?
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It appears that this feature is not officially supported by selenium. But, Tarun Lalwani has created working Java code to provide the feature. Refer - http://tarunlalwani.com/post/reusing-existing-browser-session-selenium-java/
Here is the working sample code, copied from the abov...
Rails has_and_belongs_to_many migration
...d as a parameter to create_join_table called table_name. From the docs
By default, the name of the join table comes from the union of the
first two arguments provided to create_join_table, in alphabetical
order. To customize the name of the table, provide a :table_name
option:
...
Calendar Recurring/Repeating Events - Best Storage Method
...at_interval an amount in seconds between intervals (604800 is 7 days).
By looping over each day in the calendar you can get repeat events using this simple query:
SELECT EV.*
FROM `events` EV
RIGHT JOIN `events_meta` EM1 ON EM1.`event_id` = EV.`id`
WHERE (( 1299736800 - repeat_start) % repeat_...
How do I delete a fixed number of rows with sorting in PostgreSQL?
... FROM logtable
WHERE ctid IN (
SELECT ctid
FROM logtable
ORDER BY timestamp
LIMIT 10
)
The ctid is:
The physical location of the row version within its table. Note that although the ctid can be used to locate the row version very quickly, a row's ctid will change if it is updat...