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How to execute a raw update sql with dynamic binding in rails
...using it's methods, e.g. for MySQL:
st = ActiveRecord::Base.connection.raw_connection.prepare("update table set f1=? where f2=? and f3=?")
st.execute(f1, f2, f3)
st.close
I'm not sure if there are other ramifications to doing this (connections left open, etc). I would trace the Rails code for a n...
Difference Between One-to-Many, Many-to-One and Many-to-Many?
...ate is the one side and City is the many side. There will be a column state_id in the table cities.
In unidirectional, Person class will have List<Skill> skills but
Skill will not have Person person. In bidirectional, both
properties are added and it allows you to access a Person given a
ski...
How to find if a native DLL file is compiled as x64 or x86?
...
The Magic field of the IMAGE_OPTIONAL_HEADER (though there is nothing optional about the header in Windows executable images (DLL/EXE files)) will tell you the architecture of the PE.
Here's an example of grabbing the architecture from a file.
public ...
Difference between addSubview and insertSubview in UIView class
...array then add in View'slayer
- (void)addSubview:(UIView *)subview
{
[_subviews addObject:subview];
[_layer addSublayer:subview.layer];
}
}
2.While insertSubview add your view as subview then call
[_layer insertSublayer:subview.layer atIndex:index];
- (void)insertSubview:(UIView *)subv...
Declaring abstract method in TypeScript
...defines concrete methods & properties.
*/
class Animal {
private _impl : IAnimal;
public name : string;
/**
* Here comes the clever part: by letting the constructor take an
* implementation of IAnimal as argument Animal cannot be instantiated
* without a valid imp...
How do I have an enum bound combobox with custom string formatting for enum values?
...ethod:
public struct Described<T> where T : struct {
private T _value;
public Described(T value) {
_value = value;
}
public override string ToString() {
string text = _value.ToString();
object[] attr =
typeof(T).GetField(text)
...
Python append() vs. + operator on lists, why do these give different results?
...ut answering the questions asked? People ask why PHP is called PHP and why __lt__ could not be overloaded in Python (nowadays it can). Why-questions are the most essential ones but often the trickiest to answer: they ask for the essence, not for a pointer to the manual. And of course: if you dislike...
How can I check if an ip is in a network in Python?
...otted quad string to long integer"
return struct.unpack('L',socket.inet_aton(ip))[0]
def networkMask(ip,bits):
"Convert a network address to a long integer"
return dottedQuadToNum(ip) & makeMask(bits)
def addressInNetwork(ip,net):
"Is an address in a network"
return ip &...
Reading binary file and looping over each byte
...ns of Python below 2.5. To use it in v 2.5 you'll need to import it:
from __future__ import with_statement
In 2.6 this is not needed.
Python 3
In Python 3, it's a bit different. We will no longer get raw characters from the stream in byte mode but byte objects, thus we need to alter the conditi...
How to dynamic new Anonymous Class?
...odBuilder methodGetBuilder =
typeBuilder.DefineMethod($"get_{name}",
getSetAttr,
propType,
Type.EmptyTypes);
ILGenerator methodGetIL = methodG...