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How do I get a raw, compiled SQL query from a SQLAlchemy expression?
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@cce: you're trying to find the final query. SELECT id WHERE date_added <= %s AND date_added >= %s ORDER BY count DESC IS the final query. Those %s are sent to the database by sqlalchemy -- sqlalchemy NEVER puts the actual data in place of the %s
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What should every developer know about databases? [closed]
...fluence that choice;
The concept of coverage (why you shouldn't just write SELECT *);
The difference between a clustered and non-clustered index;
Why more/bigger indexes are not necessarily better;
Why you should try to avoid wrapping filter columns in functions.
Designers should also be aware of ...
Hibernate throws MultipleBagFetchException - cannot simultaneously fetch multiple bags
...Many(mappedBy="parent", fetch=FetchType.EAGER)
@Fetch(value = FetchMode.SUBSELECT)
private List<Child> childs;
This should fix the issue, related to Hibernate bug HHH-1718
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improve th...
Difference between id and name attributes in HTML
...mitted, there is just the one value in the response - the radio button you selected.
Of course, there's more to it than that, but it will definitely get you thinking in the right direction.
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Case insensitive Query with Spring CrudRepository
With Spring CrudRepository Query; I want to select "DeviceType" entities with it's "name" property. But following query select the entitles on case sensitive manner. How I make it case insensitive way. Thanks.
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mysqli or PDO - what are the pros and cons? [closed]
...ostname;dbname=school", $username, $password)
$stmt = $dbh->query("SELECT * FROM students");
/* MAGIC HAPPENS HERE */
$stmt->setFetchMode(PDO::FETCH_INTO, new Student);
foreach($stmt as $student)
{
echo $student->getFullName().'<br />';
}
$db...
What is the difference between IQueryable and IEnumerable?
...es, meaning the custom query logic it receives, e.g., a predicate or value selector, is in the form of an expression tree instead of a delegate to a method.
IEnumerable<T> is great for working with sequences that are iterated in-memory, but
IQueryable<T> allows for out-of memory things ...
Tricks to manage the available memory in an R session
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I make aggressive use of the subset parameter with selection of only the required variables when passing dataframes to the data= argument of regression functions. It does result in some errors if I forget to add variables to both the formula and the select= vector, but it sti...
Are database triggers evil? [closed]
...lumns wouldn't exist and you'd have to process a function on each row when selecting them. That's likely to kill DBMS performance, far better to create the auto-generated column at insert/update time since that's the only time it changes.
Also, lack of triggers would prevent data rules from being e...
Undoing a commit in TortoiseSVN
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Go to Show Log Screen, select the revision that you want to undo, right click it and select Revert changes from this revision, this will do a reverse-merge.
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