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performSelector may cause a leak because its selector is unknown
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Solution
The compiler is warning about this for a reason. It's very rare that this warning should simply be ignored, and it's easy to work around. Here's how:
if (!_controller) { return; }
SEL selector = NSSelectorFromString(@"someMethod");
IMP imp = [_controller meth...
How do I update an entity using spring-data-jpa?
...pproach. save() in Spring Data JPA is backed by merge() in plain JPA, therefore it makes your entity managed as described above. It means that calling save() on an object with predefined id will update the corresponding database record rather than insert a new one, and also explains why save() is no...
Pass Array Parameter in SqlCommand
...o SQL commnd in C# like below, but it does not work. Does anyone meet it before?
12 Answers
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Spring 3 RequestMapping: Get path value
...ng.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE is optional and may be NULL or "" for some implementations. request.getRequestURI() returns the same value and is not optional.
– nidalpres
Oct 12 '14 at 0:06
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SQL left join vs multiple tables on FROM line?
...oin criteria, is being deprecated in most modern databases.
It's not just for show, the old syntax has the possibility of being ambiguous when you use both INNER and OUTER joins in the same query.
Let me give you an example.
Let's suppose you have 3 tables in your system:
Company
Department
Empl...
How to make custom error pages work in ASP.NET MVC 4
I want a custom error page shown for 500, 404 and 403. Here's what I have done:
11 Answers
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SQL Server - Return value after INSERT
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No need for a separate SELECT...
INSERT INTO table (name)
OUTPUT Inserted.ID
VALUES('bob');
This works for non-IDENTITY columns (such as GUIDs) too
share
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CSS – why doesn’t percentage height work? [duplicate]
How come a percentage value for height doesn’t work but a percentage value for width does?
6 Answers
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Is a one column table good design? [closed]
...st cases of single column design could benefit from an additional column. For example, State Codes can typically have the Full State name spelled out in a second column. Or a blacklist can have notes associated. But, if your design really does not need that information, then it's perfectly ok to ...
Rails select helper - Default selected value, how?
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without params, options_for_select is better way. It is good for any situation, good for form edit too.
– Adriano Resende
Jun 25 '15 at 13:07
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