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Unable to cast object of type 'System.DBNull' to type 'System.String`
...
ExecuteScalar will return
null if there is no result set
otherwise the first column of the first row of the resultset, which may be DBNull.
If you know that the first column of the resultset is a string, then to cover all bases you need to check for both null and DBNull. Som...
What's the best way to check if a file exists in C?
... return 0 (success) because the file does not have the read-only attribute set, but you still may not have permission to write to the file.
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Things possible in IntelliJ that aren't possible in Eclipse?
... of the collections rather than the implementation details. For lists and sets, it'll show their contents. For maps, it'll show a list of key-value pairs. It's also possible to set custom displays up.
– deterb
Jun 19 '09 at 16:48
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Run cURL commands from Windows console
...ou are about to use windows cURL, Enter your url after curl command below:
set /p input="curl "
cls
echo %input%
powershell -Command "(new-object net.webclient).DownloadString('%input%')"
pause
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What are the use(s) for tags in Go?
...pe:varchar(100);unique_index"`
Role string `gorm:"size:255"` // set field size to 255
MemberNumber *string `gorm:"unique;not null"` // set member number to unique and not null
Num int `gorm:"AUTO_INCREMENT"` // set num to auto incrementable
Address string `gorm:"i...
don't fail jenkins build if execute shell fails
... put #!/bin/sh so that the script will be executed without option; or do a set +e or anything similar on top of the build step to override this behavior.
Edited: Another thing to note is that, if the last command in your shell script returns non-0 code, the whole build step will still be marked as ...
What is the proper way to re-throw an exception in C#? [duplicate]
...(if say, all the custom logic only applied to adding to the collection, or setting it up). Now, the conditions in which that call would throw are exactly the same conditions in which your collection should throw to match the documentation of ICollection<T>.CopyTo.
Now, you could just not catc...
Interop type cannot be embedded
...u. Just open the Properties tab for the assembly in Visual Studio 2010 and set "Embed Interop Types" to "False".
EDIT: See also Michael Gustus's answer, removing the Class suffix from the types you're using.
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Static methods in Python?
...even is actually right. To answer the original question, then, in order to set up a class method, simply assume that the first argument is not going to be a calling instance, and then make sure that you only call the method from the class.
(Note that this answer refers to Python 3.x. In Python 2.x ...
Spring Boot Remove Whitelabel Error Page
...andler because some exception was thrown in our app (and Spring implicitly sets response code to 500 which is correct); is there an easy way to get hold of that exception here (to include some details in error message returned)?
– Jonik
Feb 20 '15 at 13:07
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