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What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
...s (also rows). In other words, Car → Wheel is a 1-to-many relationship.
Now, let's say you need to iterate through all the cars, and for each one, print out a list of the wheels. The naive O/R implementation would do the following:
SELECT * FROM Cars;
And then for each Car:
SELECT * FROM Wheel W...
library not found for -lPods
...ace file, not the .xcodeproj. This way in addition to your project, Xcode knows about the project in the Pods/ directory and how to build libPods.a.
– Jonathan Tran
Jul 8 '13 at 0:59
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Error: Tablespace for table xxx exists. Please DISCARD the tablespace before IMPORT
...rphaned .idb file was created in the dir...very strange...I really do not know what to assume.
– Dimitris Papageorgiou
Jul 21 '15 at 11:17
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JavaScript inheritance: Object.create vs new
... objects from this
var myObject = Object.create( base );
// myObject will now link to "base" via the prototype chain internally
So this is another concept, a more "object oriented" way of inherting. There is no "constructor function" out of the box using Object.create() for instance. But of cours...
“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”
...nting MERGE was made in 2005, but there's no progress or plan as far as I know. bugs.mysql.com/bug.php?id=9018
– Bill Karwin
Jul 16 '12 at 2:23
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Javascript communication between browser tabs/windows [duplicate]
...ame browser? For example, when Tab 2 starts audio playback, Tab 1 somehow knows about this and can pause it's player.
10 An...
Remove non-utf8 characters from string
...sses all this issues. It´s called Encoding::toUTF8().
You dont need to know what the encoding of your strings is. It can be Latin1 (ISO8859-1), Windows-1252 or UTF8, or the string can have a mix of them. Encoding::toUTF8() will convert everything to UTF8.
I did it because a service was giving m...
Webview load html from assets directory
...
wv.loadUrl("file:///android_asset/aboutcertified.html"); // now it will not fail here
}
}
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Tests not running in Test Explorer
...fine. All tests are running, all tests are showing the right test outcome. Now a coworker told me, that the tests are not running on his machine using the Visual Studio test explorer. They are not working either on my machine, so i can exclude some local missing files or something.
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What are the differences between Generics in C# and Java… and Templates in C++? [closed]
...s not an object, and there's no underlying virtual machine which needs to know about a Person class. There's no boxing or unboxing, and functions don't have to belong to classes, or indeed anything.
Because of this, the C++ compiler places no restrictions on what you can do with templates - basicall...