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Objective-C: difference between id and void *
...Under GC Only or GC Supported modes, the compiler will emit write barriers for references of type id, but not for type void *. When declaring structures, this can be a critical difference. Declaring iVars like void *_superPrivateDoNotTouch; will cause premature reaping of objects if _superPrivat...
How do I search for an object by its ObjectId in the mongo console?
I've found this question answered for C# and Perl, but not in the native interface. I thought this would work:
12 Answers
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javascript find and remove object in array based on key value
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I can grep the array for the id, but how can I delete the entire object where id == 88
Simply filter by the opposite predicate:
var data = $.grep(data, function(e){
return e.id != id;
});
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How can I generate a unique ID in Python? [duplicate]
...
Perhaps uuid.uuid4() might do the job. See uuid for more information.
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JavaScript loop through json array?
...romWho": "hello2@email.se"
}];
You can loop over the Array like this:
for(var i = 0; i < json.length; i++) {
var obj = json[i];
console.log(obj.id);
}
Or like this (suggested from Eric) be careful with IE support
json.forEach(function(obj) { console.log(obj.id); });
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MySQL ON vs USING?
...o. One can join tables ON a column, a set of columns and even a condition. For example:
SELECT * FROM world.City JOIN world.Country ON (City.CountryCode = Country.Code) WHERE ...
USING is useful when both tables share a column of the exact same name on which they join. In this case, one may say:
...
Get img thumbnails from Vimeo?
I want to get a thumbnail image for videos from Vimeo.
23 Answers
23
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Passing an array to a query using a WHERE clause
...s are still a quoted list, so it comes out as "WHERE id IN ( '1,2,3,4' )", for example. You need to quote each identifier separately, or else ditch the quotes inside the parentheses.
– Rob
May 25 '09 at 20:05
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Rails: Why does find(id) raise an exception in rails? [duplicate]
... ids (1, 5, 6), or an array of ids ([5, 6, 10]). If no record can be found for all of the listed ids, then RecordNotFound will be raised.
If you don't want the exception to be raised, use find_by_id, which will return nil if it can't find an object with the specified id. Your example would then b...
How to reset postgres' primary key sequence when it falls out of sync?
...CE((SELECT MAX(id)+1 FROM your_table), 1), false);
COMMIT;
Source - Ruby Forum
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