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How to execute raw SQL in Flask-SQLAlchemy app
...r database, but all of the major relational databases support them in some form.
Assuming it's a SELECT query, this will return an iterable of RowProxy objects.
You can access individual columns with a variety of techniques:
for r in result:
print(r[0]) # Access by positional index
print(...
When to use ' (or quote) in Lisp?
...
We'd get (+ 3 2), + is then invoked on 3 and 2 yielding 5. Our original form is now (* 5 3) yielding 15.
Explain quote Already!
Alright. As seen above, all arguments to a function are evaluated, so if you would like to pass the symbol a and not its value, you don't want to evaluate it. Lisp sy...
Setting focus on an HTML input box on page load
...
You could also use:
<body onload="focusOnInput()">
<form name="passwordForm" action="verify.php" method="post">
<input name="passwordInput" type="password" />
</form>
</body>
And then in your JavaScript:
function focusOnInput() {
documen...
What does it mean that Javascript is a prototype based language?
...
Prototypal inheritance is a form of object-oriented code reuse. Javascript is one of the only [mainstream] object-oriented languages to use prototypal inheritance. Almost all other object-oriented languages are classical.
In classical inheritance, th...
The case against checked exceptions
...pty())
and it will be painful to have to wrap in try/catch every time.
Informing the User:
Checked exceptions should be used in cases where you can imagine a useful error message being presented to the end user.
This is the "and what will you do when it happens?" question I raised above. It also...
Inserting HTML elements with JavaScript
...his method works in all modern browsers. For IE 5.5 and below you could perform a check like:: if (document.createDocumentFragment) { create('...'); } else { /* Use innerHTML perhaps */ }
– James
May 2 '09 at 14:41
...
“The remote certificate is invalid according to the validation procedure.” using Gmail SMTP server
...rrors.None)
return true;
else
{
if (System.Windows.Forms.MessageBox.Show("The server certificate is not valid.\nAccept?", "Certificate Validation", System.Windows.Forms.MessageBoxButtons.YesNo, System.Windows.Forms.MessageBoxIcon.Question) == System.Windows.Forms.DialogResult...
Java logical operator short-circuiting
...lse when A is false, no matter what B is. If you use the || and && forms, rather than the | and & forms of these operators, Java will not bother to evaluate the right-hand operand alone. This is very useful when the right-hand operand depends on the left one being true or false in order ...
What is the _references.js used for?
...the intellisense for it. You can add a reference to your custom JS file in form like this:
/// <reference path="MyScriptFile.js" />
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Invoke(Delegate)
...swer to this question lies in how C# Controls work
Controls in Windows Forms are bound to a specific thread and are not
thread safe. Therefore, if you are calling a control's method from a
different thread, you must use one of the control's invoke methods to
marshal the call to the proper ...