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CHECK constraint in MySQL is not working
...e MySQL Reference Manual says:
The CHECK clause is parsed but ignored by all storage engines.
Try a trigger...
mysql> delimiter //
mysql> CREATE TRIGGER trig_sd_check BEFORE INSERT ON Customer
-> FOR EACH ROW
-> BEGIN
-> IF NEW.SD<0 THEN
-> SET NEW.SD...
How to detect if a variable is an array
...oundaries as each frame has its own Array object. You can work around this by checking the internal [[Class]] property of the object. To get it, use Object.prototype.toString() (this is guaranteed to work by ECMA-262):
Object.prototype.toString.call(obj) === '[object Array]'
Both methods will onl...
Execute unit tests serially (rather than in parallel)
.... Using shared state (e.g. depending on a static property that is modified by each test) is regarded as bad practice.
Having said that, your question about running xUnit tests in sequence does have an answer! I encountered exactly the same issue because my system uses a static service locator (whic...
How do I add a library project to Android Studio?
...has changed.
My description is focused on adding external library project by hand via Gradle files (for better understanding the process). If you want to add a library via Android Studio creator just check the answer below with visual guide (there are some differences between Android Studio 1.0 and...
Error: free(): invalid next size (fast):
...a memory error. You may be trying to free a pointer that wasn't allocated by malloc (or delete an object that wasn't created by new) or you may be trying to free/delete such an object more than once. You may be overflowing a buffer or otherwise writing to memory to which you shouldn't be writing, ...
github: No supported authentication methods available
...sion is probably accessed through plink and your keys are probably managed by Pageant.
Import the key you need each time you load Pageant. If you followed guides that said "import your key", and saw that it worked, but it doesn't work now, see Chapter 9: Using Pageant for authentication.
One last t...
What is this: [Ljava.lang.Object;?
... an array type then the binary name of the class is returned, as specified by the Java Language Specification (§13.1).
If this class object represents a primitive type or void, then the name returned is the Java language keyword corresponding to the primitive type or void.
If this class ...
Why do we need private subnet in VPC?
...core differentiation between a public and private subnet in VPC is defined by what that subnet's default route is, in the VPC routing tables.
This configuration, in turn, dictates the validity of using, or not using, public IP addresses on instances on that particular subnet.
Each subnet has ex...
How to create a self-signed certificate with OpenSSL
...previously. If you need more security, you should use a certificate signed by a certificate authority (CA).
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CSS Selector “(A or B) and C”?
...its initial version :any(), which works the same way, but will be replaced by :matches(). We just have to wait a little more before using this everywhere (I surely will).
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