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How to 'insert if not exists' in MySQL?
...se
repeated executions will not die due to ‘duplicate
primary key’ errors.
Method 1: using REPLACE
It’s very simple:
REPLACE INTO `transcripts`
SET `ensembl_transcript_id` = 'ENSORGT00000000001',
`transcript_chrom_start` = 12345,
`transcript_chrom_end` = 12678;
If the r...
What is the purpose of the “final” keyword in C++11 for functions?
...ides base::f
};
struct mostderived : derived {
//void f(); // error: cannot override!
};
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Retrieving a random item from ArrayList [duplicate]
...has never been declared as a variable, so it makes sense that it causes an error. But more importantly, you have code after a return statement and this will cause an unreachable code error.
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Difference between 'struct' and 'typedef struct' in C++?
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If you just said:
struct Foo { ... };
Foo x;
you would get a compiler error, because Foo is only defined in the tag namespace.
You'd have to declare it as:
struct Foo x;
Any time you want to refer to a Foo, you'd always have to call it a struct Foo. This gets annoying fast, so you can add...
How can I combine hashes in Perl?
What is the best way to combine both hashes into %hash1? I always know that %hash2 and %hash1 always have unique keys. I would also prefer a single line of code if possible.
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What is the purpose of willSet and didSet in Swift?
Swift has a property declaration syntax very similar to C#'s:
11 Answers
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How can I list ALL DNS records?
Is there any way I can list ALL DNS records for a domain?
8 Answers
8
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Vagrant stuck connection timeout retrying
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The GUI showed me the following error: VT-x/AMD-V hardware acceleration is not available on your system. Your 64-bit quest will fail to detect a 64-bit CPU and will not be able to boot
– SKuijers
Jan 9 '15 at 11:34
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How to set versionName in APK filename using gradle?
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@PHPirate: almost works: Error:(34, 0) Cannot set the value of read-only property 'name'
– Mooing Duck
Dec 10 '17 at 2:11
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How to use background thread in swift?
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I am using your code in xCode 6.0.1 and ios 8.It gives error as "QOS_CLASS_BACKGROUND" return class and it is of type UInt32 and "dispatch_get_global_queue" requires 1st parameter as int so type error is coming.
– Zalak Patel
Oct 29 '14 at 1...