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ActiveRecord

网络活动记录；活动记录模式；三种关系

ActiveRecord

网络释义

ActiveRecord

活动记录

4 基于活动记录(ActiveRecord)的O/R映射以上任何一个特征，采用java领域的相关知识都不难实现。

活动记录模式

...后，我们可以分析如何使用一些很重要的设计模式，例如活动记录模式（ActiveRecord），该模式通过Ruby on Rails平台已 …

三种关系

EasyTime - Ruby学习笔记 ... Single table inheritance：单表继承 ActiveRecord： 三种关系 ActiveRecord::transaction- 事务 ...

例句：

But it would be nice to use Rails on projects having legacy schemas , when ActiveRecord is not always up to the challenge .

但是当 ActiveRecord 并不总能应对挑战时，最好将 Rails 应用于使用老旧模式的项目。

Through some nifty lexical analysis , Active Record is able to determine that the Order class will map to the ORDERS table in the database .

通过一些漂亮的词汇分析，ActiveRecord 能够判断出，Order 类将映射到数据库中的 ORDERS 表。

The only thing I regret is not having implemented some kind of ActiveRecord-like framework between the PHP tier and the database .

我唯一遗憾的是在 PHP 层与数据库之间没有实现某种类似 ActiveRecord 的框架。

I believe that ActiveRecord strikes an effective set of compromises , usually erring on the side of simplicity .

我认为 ActiveRecord 实现了一组有效的妥协，常常选择了简单性。

As well, ActiveRecord associations and validations are redundant specifications of database constraints .

同样，ActiveRecord 的关联和校验对于数据库的约束定义来说也是一种冗余。

ActiveRecord uses primary and foreign keys for a variety of tasks , and both are defined as constraints on your database .

ActiveRecord 会为不同的任务变量使用主键和副键，它们都是作为数据库的约束而定义的。

ActiveRecord's static findById function is an example of a method typically found in an implementation of the active record design pattern .

ActiveRecord 的静态 findById 函数是活动记录设计模式的实现内常见的一个方法的例子。

Active Record users do not always need to change model objects as the data model changes.

ActiveRecord 用户并不总需要随着数据模型的改变而改变模型对象。

If this could be simplified into a single statement , Sequel performs worse if you don't optimize , and better if you do.

如果查询可以简化为一条单独的语句，未进行优化的情况下，Sequel 的执行效果相对要差，反之会优于 ActiveRecord 。

I'm not sure if performance would be a reason to use Sequel over ActiveRecord (or vice versa).

我不确信是否性能是使用 Sequel （或者 ActiveRecord ）的一个原因。

ActiveRecord is innovative in its use of a database 's information schema to dynamically generate table and column mappings .

ActiveRecord 是以一种创新的方式使用数据库的 schema ，并自动创建表格和字段的映射。

As you can see , by default the Patient class simply extends ActiveRecord.

可以看到，默认情况下 Patient 类仅仅扩展了 ActiveRecord 。

This generates an ActiveRecord model, a controller with an appropriate route mapped to it, and several view templates .

这段代码将生成 ActiveRecord 模型、带有相应映射路径的控制器和几个视图模板。

Many ActiveRecord validations directly correspond with database constraints , and DrySQL generates such validations automatically .

许多 ActiveRecord 校验都是与数据库的约束相对应的，并且 DrySQL 会自动生成校验。

With ActiveRecord, I define only the database schema , either in SQL or in a Ruby class called a migration .

通过 ActiveRecord ，我只定义数据库模式：或者用 SQL 或者用称为迁移（migration ）的 Ruby 类。

Rails uses the ActiveRecord library to handle database access and object-relational mapping between database tables and Ruby object models.

Rails 使用 ActiveRecord 库处理数据库访问及数据库表与 Ruby 对象模型之间的对象关系映射。

Attendees will learn about topics ranging from building advanced domain specific languages in Ruby to JRuby to advanced ActiveRecord.

参会者将接触从构建 Ruby 的高级特殊领域语言到 JRuby ，以及高级 ActiveRecord 的相关论题。

Active Record generates the SQL to tell the database to insert the record .

ActiveRecord 产生 SQL 告诉资料库插入一笔资料。

By contrast , Ruby on Rails uses a single model layer using the ActiveRecord design pattern , a controller layer, and a view layer .

相比之下，RubyonRails 包括一个使用 ActiveRecord 设计模式的模型层、一个控制器层和一个视图层。

The other problem with ActiveRecord that transparent persistence solves is subclassing .

透明持久化解决了的 ActiveRecord 的另外一个问题就是子类化。

Other lightweight solutions , such as iBATIS and the Active Record design pattern , don't try to do object-relational mapping at all.

其他轻量级解决方案，例如 iBATIS 和 ActiveRecord 设计模式，根本不会试图进行对象关系映射。

Active Record is an object-relational mapping (ORM) that follows a standard ORM model .

ActiveRecord 是遵照了标准的 ORM 模型的对象关系映射（object-relationalmapping，ORM ）。

The object Contact is the ActiveRecord object -relational mapping that the model provides .

对象 Contact 是模型所提供的 ActiveRecord 对象 -关系映射。

ActiveRecord is not a full object relational mapping layer .

ActiveRecord 并非全对象关系型映射层。

The ActiveRecord class uses the abstract modifier to ensure that coders can't instance an ActiveRecord object .

ActiveRecord 类使用 abstract 修饰符来确保代码不会实例化一个 ActiveRecord 对象。

is also a great introduction to this topic and shows the motivation and theory behind the "relational algebra " in ActiveRecord 3.

也是一个关于此话题的很好的介绍，解释了 ActiveRecord3 中的 “关系代数 ”背后的的动机和理论。

ActiveRecord

ActiveRecord

活动记录

活动记录模式

三种关系

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