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ActiveRecord

  • Web活动记录；活动记录模式；三种关系

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1.
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。
michael.nona.name|Based on 10 pages
2.
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平台已经变得非常 …
book.51cto.com|Based on 3 pages
3.
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 ...
my4java.itpub.net|Based on 2 pages

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AllAll,活动记录活动记录,活动记录模式活动记录模式,三种关系三种关系
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
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1.
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。
dàn shì dāng ActiveRecord bìng bù zǒng néng yìng duì tiǎo zhàn shí , zuì hǎo jiāng Rails yìng yòng yú shǐ yòng lǎo jiù mó shì de xiàng mù 。
www.ibm.com
2.
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。
tōng guò yì xiē piào liang de cí huì fēn xī , ActiveRecord néng gòu pàn duàn chū , Order lèi jiāng yìng shè dào shù jù kù zhōng de ORDERS biǎo 。
www.ibm.com
3.
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。
wǒ wéi yī yí hàn de shì zài PHP céng yǔ shù jù kù zhī jiān méi yǒu shí xiàn mǒu zhǒng lèi sì ActiveRecord de kuàng jià 。
www.infoq.com
4.
It does not currently include Active Record, the powerful domain model library on which Rails database model objects are built.
当前的版本还未包括ActiveRecord，这是Rails数据库模型对象赖以为根本的强大的领域模型类库。
dāng qián de bǎn běn hái wèi bāo kuò ActiveRecord , zhè shì Rails shù jù kù mó xíng duì xiàng lài yǐ wèi gēn běn de qiáng dà de lǐng yù mó xíng lèi kù 。
www.infoq.com
5.
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。
wǒ rèn wéi ActiveRecord shí xiàn le yī zǔ yǒu xiào de tuǒ xié , cháng cháng xuǎn zé le jiǎn dān xìng 。
www.ibm.com
6.
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。
tóng yàng , ActiveRecord de guān lián hé jiào yàn duì yú shù jù kù de yuē shù dìng yì lái shuō yě shì yī zhǒng rǒng yú 。
www.infoq.com
7.
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 huì wèi bù tóng de rèn wu biàn liàng shǐ yòng zhǔ jiàn hé fù jiàn , tā men dōu shì zuò wéi shù jù kù de yuē shù ér dìng yì de 。
www.infoq.com
8.
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。
ActiveRecord de jìng tài findById hán shù shì huó dòng jì lù shè jì mó shì de shí xiàn nèi cháng jiàn de yī gè fāng fǎ de lì zǐ 。
www.ibm.com
9.
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。
ActiveRecord yòng hù bìng bù zǒng xū yào suí zhe shù jù mó xíng de gǎi biàn ér gǎi biàn mó xíng duì xiàng 。
www.ibm.com
10.
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。
rú guǒ chá xún kě yǐ jiǎn huà wéi yī tiáo dān dú de yǔ jù , wèi jìn xíng yōu huà de qíng kuàng xià , Sequel de zhí xíng xiào guǒ xiāng duì yào chà , fǎn zhī huì yōu yú ActiveRecord 。
www.infoq.com
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