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How to do an instanceof check with Scala(Test)
...r needs. I would recommend it in those cases because it gives you the typecasting for free and leaves less room for error.
Example:
OuterType foo = blah
foo match {
case subFoo : SubType => {
subFoo.thingSubTypeDoes // no need to cast, use match variable
}
case subFoo => {
// ...
Best way to get identity of inserted row?
...
Add
SELECT CAST(scope_identity() AS int);
to the end of your insert sql statement, then
NewId = command.ExecuteScalar()
will retrieve it.
share
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How to avoid the “divide by zero” error in SQL?
...of the first argument. This altered example works fine: SELECT 1 / NULLIF(CAST(NULL AS INT), 0). In real life, you are going to supply a table column to NULLIF() rather than a NULL constant. Since table columns have known datatypes, this also works fine: SELECT 1 / NULLIF(SomeNullableColumn, 0) F...
Python: changing value in a tuple
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It seems unnecessary and memory inefficient to recast into a list and use a temporary variable. You can just unpack into a tuple with the same name and while unpacking update whatever needs updating.
– Brian Spiering
Oct 5 '18 at 3:23
...
When restoring a backup, how do I disconnect all active connections?
...O
@spid
WHILE @@FETCH_STATUS = 0
BEGIN
SET @SQLCommand = 'KILL ' + CAST(@spid AS VARCHAR)
EXECUTE(@SQLCommand)
FETCH NEXT FROM UserCursor INTO
@spid
END
CLOSE UserCursor
DEALLOCATE UserCursor
GO
shar...
Boolean literals in PowerShell
...ace, e.g. in a conditional statement. And in those cases you don't need to cast at all. if ($s.Length) { ... } is perfectly fine, for example.
– Joey
Oct 1 '14 at 12:41
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Read and write a String from text file
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You don't have to cast the errors as NSError, or even use "catch let error." You can just do catch and you get the error variable for free.
– cuomo456
Nov 18 '16 at 0:36
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Why use ICollection and not IEnumerable or List on many-many/one-many relationships?
...e advantage of this when generating foreach code. If the List<T> is cast to IEnumrable<T> before the foreach, the IEnumerable<T>.GetEnumerator() method will return a heap-allocated object, rendering the optimization impossible.
– supercat
May...
How to create a HashMap with two keys (Key-Pair, Value)?
... a 100% sure whether private access level works correctly in any case when casting the Object to a Key.
If you wonder about the finals, I declare anything as final which value is set on instancing and never changes - and therefore is an object constant.
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PHP convert XML to JSON
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I figured it out. json_encode handles objects differently than strings. I cast the object to a string and it works now.
foreach($xml->children() as $state)
{
$states[]= array('state' => (string)$state->name);
}
echo json_encode($states);
...