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How do I drop a foreign key constraint only if it exists in sql server?
...target a foreign key constraint on a specific table, use this:
IF EXISTS (SELECT *
FROM sys.foreign_keys
WHERE object_id = OBJECT_ID(N'dbo.FK_TableName_TableName2')
AND parent_object_id = OBJECT_ID(N'dbo.TableName')
)
ALTER TABLE [dbo.TableName] DROP CONSTRAINT [FK_TableName_TableName2]...
For loop example in MySQL
...+1;
end while;
commit;
end #
delimiter ;
call load_foo_test_data();
select * from foo order by id;
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Where do “pure virtual function call” crashes come from?
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They can result if you try to make a virtual function call from a constructor or destructor. Since you can't make a virtual function call from a constructor or destructor (the derived class object hasn't been constructed or has already been destroyed), it calls the base class versio...
Maximum number of threads in a .NET app?
What is the maximum number of threads you can create in a C# application? And what happens when you reach this limit? Is an exception of some kind thrown?
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Any reason to clean up unused imports in Java, other than reducing clutter?
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One would be that if you remove the class referenced by the import from the classpath, you won't get a silly compiler error that served no purpose. And you won't get false positives when you perform a "where used" search.
Another (but this would be very specific in nature) would be if the u...
NSRange to Range
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@Zaph: since the range comes from the UITextField, which is written in Obj-C against NSString, I suspect that only valid ranges based on the unicode characters in the string would be provided by the delegate callback, and so this is safe to use, but I ha...
Redeploy alternatives to JRebel [closed]
...allows unlimited class redefinitions at runtime. You can add/remove fields and methods and change the super types of a class at runtime. The features of DCEVM may be integrated in a future update of Java as part of JEP 159.
The binaries available on the original site are limited to Java 6u25 and to...
Get selected subcommand with argparse
When I use subcommands with python argparse, I can get the selected arguments.
2 Answers
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iPhone UITextField - Change placeholder text color
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Easy and pain-free, could be an easy alternative for some.
_placeholderLabel.textColor
Not suggested for production, Apple may reject your submission.
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Getting an empty JQuery object
In the following code I set up a change handler on a select box to show and hide some follow up questions based on the value of the selection.
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