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PHP连接MySQL报错：Fatal error: Call to undefined function mysql_connec...
PHP连接MySQL报错：Fatal error: Call to undefined function mysql_connect()之解决方法【问题描述】PHP测试连接MySQL的程序如下：<?php$host='localhost';$user_name='root';$password='mysql';$conn=m...【问题描述】
PHP测试连接MySQL的程序如下：
<?php
$host='localh...
Hidden features of Ruby
...
From Ruby 1.9 Proc#=== is an alias to Proc#call, which means Proc objects can be used in case statements like so:
def multiple_of(factor)
Proc.new{|product| product.modulo(factor).zero?}
end
case number
when multiple_of(3)
puts "Multiple of 3"
when multipl...
How to get a variable name as a string in PHP?
...(
[0] => $baz
[1] => baz
)
It works based on the line that called the function, where it finds the argument you passed in. I suppose it could be expanded to work with multiple arguments but, like others have said, if you could explain the situation better, another solution would prob...
How do you get a string from a MemoryStream?
...
Dispose is not called when a variable goes out of scope. Finalize will be called when the GC gets around to it, but Dispose is something that must be called before the variable goes out of scope. I don't call it above because I know the imp...
What is the purpose of a stack? Why do we need it?
...rs like the C# compiler generate CIL, and then at runtime another compiler called the JIT (Just In Time) compiler turns the IL into actual machine code that can execute.
So first let's answer the question "why have MSIL at all?" Why not just have the C# compiler write out machine code?
Because i...
Git - What is the difference between push.default “matching” and “simple”
...l become the default in GIT 2.0
Whereas matching will push all branches locally that have the same name on the remote. (Without regard to your current working branch ). This means potentially many different branches will be pushed, including those that you might not even want to share.
In my pers...
Understanding __get__ and __set__ and Python descriptors
...ith the Temperature class). For example:
temp=Temperature()
temp.celsius #calls celsius.__get__
Accessing the property you assigned the descriptor to (celsius in the above example) calls the appropriate descriptor method.
instance in __get__ is the instance of the class (so above, __get__ would ...
Do the parentheses after the type name make a difference with new?
...erated as opposed to user-defined.
new C - default-initializes C, which calls the default ctor.
new C() - value-initializes C, which calls the default ctor.
So in all versions of C++ there's a difference between new A and new A() because A is a POD.
And there's a difference in behavior betwee...
onMeasure custom view explanation
...als, but each one is a little bit different than the other. Sometimes they call super.onMeasure at the end, sometimes they use setMeasuredDimension and didn't call it. Where is a difference?
...
PostgreSQL: insert from another table
...
Just supply literal values in the SELECT:
INSERT INTO TABLE1 (id, col_1, col_2, col_3)
SELECT id, 'data1', 'data2', 'data3'
FROM TABLE2
WHERE col_a = 'something';
A select list can contain any value expression:
But the expressions in the select list do not have to reference any co...