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9个常用iptables配置实例 - 更多技术 - 清泛网 - 专注C/C++及内核技术
9个常用iptables配置实例iptables命令可用于配置Linux的包过滤规则，常用于实现防火墙、NAT。咋一看iptables的配置很复杂，掌握规律后，其实用iptables完成指定任务...iptables命令可用于配置Linux的包过滤规则，常用于实现防火墙、NAT。...
Returning IEnumerable vs. IQueryable
... approximately takes 90 seconds to run that block of code against a WebLog table which has 1 million records.
So, all table records are loaded into memory as objects, and then with each .Where() it will be another filter in memory against these objects.
When we use IQueryable instead of IEnumerabl...
Setting up connection string in ASP.NET to SQL SERVER
...tabase using the details verified above in the con string wizzard. Add any table and save the file.
Now go into the web config, and magically, you will see nice clean working connection string there with all the details you need.
{ Below was part of an old post so you can ignore this, I leave i...
What is an AngularJS directive?
...e things like <a href="...">, <img src="...">, <br>, <table><tr><th>. How would you describe what a, href, img, src, br, table, tr, and th are? That's what a directive is.
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What are the pros and cons of performing calculations in sql vs. in your application
shopkeeper table has following fields:
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When to use EntityManager.find() vs EntityManager.getReference() with JPA
...tabase entity and then pass the returned object to be persisted in another table.
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What does “S3 methods” mean in R?
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method calls look like canvas$drawRect("blue"). RC objects are also
mutable: they don’t use R’s usual copy-on-modify semantics, but are
modified in place. This makes them harder to reason about, but allows
them to solve problems that are difficult to solve with S3 or S4.
There...
The JPA hashCode() / equals() dilemma
...ness of the business id in the database. Why having THREE indexes for each table in the database then?
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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...
How do function pointers in C work?
...eritance in C.
Let's say we want to make a subclass of String, say an ImmutableString. In order to make the string immutable, the set method will not be accessible, while maintaining access to get and length, and force the "constructor" to accept a char*:
typedef struct ImmutableString_Struct* Imm...