大约有 5,880 项符合查询结果（耗时：0.0284秒） [XML]
Is effective C++ still effective?
...he details of C++0x, I expected to groan a bit
as I reviewed this book's table of contents with C++0x in mind. Surely
some Items would be inappropriate. But the advice I found proved
sound. Should C++0x developers prefer consts, enums, and inlines to
#defines (Item 2)? They should. Should th...
Rails: How can I set default values in ActiveRecord?
...is. Which is really odd and unfortunate. A sensible preferred method for establishing model attribute defaults upon creation seems like something Rails should already have built in. The only other (reliable) way, overriding initialize, just seems really convoluted for something that should be clear ...
How to calculate age (in years) based on Date of Birth and getDate()
I have a table listing people along with their date of birth (currently a nvarchar(25))
34 Answers
...
How to save all the variables in the current python session?
... -globals() = Return a dictionary representing the current global symbol table.
This is always the dictionary of the current module (inside a function or method,
this is the module where it is defined, not the module from which it is called).
-locals() = Update ...
How can I stop a Postgres script when it encounters an error?
... Yes, and not to forget continuing when it encounters DDL Create table errrors... (version: postrgres 10). Yes, it skips one table and goes onto the others...
– JL Peyret
Jan 23 '19 at 9:30
...
how to add records to has_many :through association in rails
...
'The best way' depends on your needs and what feels most comfortable. Confusion comes from differences ActiveRecord's behavior of the new and create methods and the << operator.
The new Method
new will not add an association record for you. You have to build the House and Agent ...
Using global variables in a function
... natural place for global data:
Each module has its own private symbol table, which is used as the global symbol table by all functions defined in the module. Thus, the author of a module can use global variables in the module without worrying about accidental clashes with a user’s global vari...
LINQPad [extension] methods [closed]
...Customers, @"c:\temp\customers.csv");
This will write the content of the table Customers to the CSV file c:\temp\customers.csv. You can also find a nice example how to use Util.WriteCsv and then display the CSV data in Linqpad's result window here.
Hints:
To get/create a CSV file which is in t...
How to use cURL to get jSON data and decode the data?
...;h1>Total : '.$total.'';
echo $Str;
//You Can Also Make In Table:
foreach ($data as $key => $value)
{
echo ' <td><font face="calibri"color="red">'.$value[type].' </font></td><td><font face="calibri"color="b...
Rails :dependent => :destroy VS :dependent => :delete_all
...s associated elements where delete_all can delete multiple data from self table as DELETE * FROM table where field = 'xyz'
:Dependent possible options:
Controls what happens to the associated objects when their owner is destroyed. Note that these are implemented as callbacks, and Rails executes ...