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C++ “virtual” keyword for functions in derived classes. Is it necessary?
... you intend to override a virtual function in a derived class, but make an error in the signature so that it declares a new and different virtual function. This function may be an overload of the base class function, or it might differ in name. Whether or not you use the virtual keyword in the der...
Delimiters in MySQL
...port it will cause it to be sent to the server, which will report a syntax error. For example, using PHP and MySQLi:
$mysqli = new mysqli('localhost', 'user', 'pass', 'test');
$result = $mysqli->query('DELIMITER $$');
echo $mysqli->error;
Errors with:
You have an error in your SQL syntax; ch...
how to permit an array with strong parameters
...s must be at the end of the attributes list, otherwise you'll get a syntax error.)
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Make Https call using HttpClient
...ill need to have a trusted SSL cert or your calls will fail with untrusted error.
EDIT Answer: ClientCertificates with HttpClient
WebRequestHandler handler = new WebRequestHandler();
X509Certificate2 certificate = GetMyX509Certificate();
handler.ClientCertificates.Add(certificate);
HttpClient clie...
Migration: Cannot add foreign key constraint
... however when I migrate my table using artisan i am thrown the following error:
33 Answers
...
Does MySQL foreign_key_checks affect the entire database?
...foreign key (FK) while FOREIGN_KEY_CHECKS are ON, then Mysql will raise an error and refuse to add the FK, because of the broken reference. When you add the foreign key while FOREIGN_KEY_CHECKS are OFF, mysql continues without error. Even when you enable the checks afterwards, there will be no erro...
Mongod complains that there is no /data/db folder
...ify the db-path manually. I wouldn't recommend doing that.
Edit:
the error message you're getting is "Unable to create/open lock file: /data/db/mongod.lock errno:13 Permission denied". The directory you created doesn't seem to have the correct permissions and ownership --
it needs to be writa...
Unioning two tables with different number of columns
...nd followed above answer. But mismatch in the Order of data type caused an error. The below description from another answer will come handy.
Are the results above the same as the sequence of columns in your table? because oracle is strict in column orders. this example below produces an error:
cre...
Web API Put Request generates an Http 405 Method Not Allowed error
Here's the call to the PUT method on my Web API - the third line in the method (I am calling the Web API from an ASP.NET MVC front end):
...
Assigning code to a variable
...lts results = provider.CompileAssemblyFromSource(parameters, code);
Check errors:
if (results.Errors.HasErrors)
{
StringBuilder sb = new StringBuilder();
foreach (CompilerError error in results.Errors)
{
sb.AppendLine(String.Format("Error ({0}): {1}", erro...