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Differences between Perl and PHP [closed]
...han @foo or %foo.
(related to the previous point) Perl has separate symbol table entries for scalars, arrays, hashes, code, file/directory handles and formats. Each has its own namespace.
Perl gives access to the symbol table, though manipulating it isn't for the faint of heart. In PHP, symbol table...
Can I force a page break in HTML printing?
I'm making a HTML report that is going to be printable, and it has "sections" that should start in a new page.
10 Answers
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How can I avoid running ActiveRecord callbacks?
... in any way, consider using a "shadow object" pointing to your existing db table. Like so:
class ImportedPerson < ActiveRecord::Base
self.table_name = 'people'
end
This works with every version of Rails, is threadsafe, and completely eliminates all validations and callbacks with no modificat...
Truncate all tables in a MySQL database in one command?
Is there a query (command) to truncate all the tables in a database in one operation? I want to know if I can do this with one single query.
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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
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Extending the User model with custom fields in Django
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Since Django 1.5 you may easily extend the user model and keep a single table on the database.
from django.contrib.auth.models import AbstractUser
from django.db import models
from django.utils.translation import ugettext_lazy as _
class UserProfile(AbstractUser):
age = models.PositiveInteg...
CASCADE DELETE just once
...esql database on which I want to do a few cascading deletes. However, the tables aren't set up with the ON DELETE CASCADE rule. Is there any way I can perform a delete and tell Postgresql to cascade it just this once? Something equivalent to
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Drop all the tables, stored procedures, triggers, constraints and all the dependencies in one sql st
...way in which I can clean a database in SQl Server 2005 by dropping all the tables and deleting stored procedures, triggers, constraints and all the dependencies in one SQL statement?
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...LINUX字段的值是disabled，如果不是则改为disabled。
service iptables stop
service ip6tables stop
service NetworkManager stop
chkconfig iptables off
chkconfig ip6tables off
chkconfig NetworkManager off
2.2.4 hosts 文件配置
vi /etc/hosts
127.0.0.1 localhost localho...
Can I store images in MySQL [duplicate]
...need to save as a blob, LONGBLOB datatype in mysql will work.
Ex:
CREATE TABLE 'test'.'pic' (
'idpic' INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
'caption' VARCHAR(45) NOT NULL,
'img' LONGBLOB NOT NULL,
PRIMARY KEY ('idpic')
)
As others have said, its a bad practice but it can be don...