大约有 7,700 项符合查询结果（耗时：0.0253秒） [XML]
mysql - how many columns is too many?
...e tables, rows and columns, work within that constraint if you want max performance, mimic your objects for convenience at the sake of performance. So should every piece of information about a person be stored within the same row? no, break them out and group them into different tables (using my ex...
SQL JOIN and different types of JOINs
...n top of it. After all, the mere concept of cross join invalidates these informal and inaccurate Venn diagram visualisations...
– Lukas Eder
Apr 21 '17 at 17:25
1
...
“Code too large” compilation error in Java
...his limit is not fixed? Because it is fixed and required by the class file format specification.
– Joachim Sauer
Mar 9 '10 at 9:43
1
...
Array to String PHP?
...e nested arrays - which can happen with $_POST if you're using array-named form inputs.
– Leith
Oct 24 '16 at 4:47
wit...
In where shall I use isset() and !empty()
...is not an effective way to validate text inputs and text boxes from a HTML form.
17 Answers
...
Why does the CheckBoxFor render an additional input tag, and how can I get the value using the FormC
...pproach that both Ruby on
Rails and MonoRail use.
When you submit a form with a checkbox, the value is only posted if
the checkbox is checked. So, if you leave the checkbox unchecked then
nothing will be sent to the server when in many situations you would
want false to be sent instead....
Passing an array by reference
...yArray)
^ Pass an array. Array decays to a pointer. Thus you lose size information.
void Func(int (*myFunc)(double))
^ Pass a function pointer. The function returns an int and takes a double. The parameter name is myFunc.
...
DropDownList in MVC 4 with Razor
...
You have to be careful as none of the posted solutions perform any kind of server-side validation. Here's an elegant solution that performs both client-side and server-side validation to ensure valid data is posted to the model. stackoverflow.com/a/56185910/3960200
...
Running a Python script from PHP
...t a quick reminder for those trying to use shell_exec on a
unix-type platform and can't seem to get it to work. PHP executes as
the web user on the system (generally www for Apache), so you need to
make sure that the web user has rights to whatever files or
directories that you are trying to...
Python add item to the tuple
...
#1 form
a = ('x', 'y')
b = a + ('z',)
print(b)
#2 form
a = ('x', 'y')
b = a + tuple('b')
print(b)
share
|
improve this an...