An object-relational mapping (ORM) case scenario.
对象-关系映射(ORM)案例场景。
See Resources for more information on issues around object-relational mapping.
有关对象关系映射的问题的更多信息，请参见参考资料。
However, for many years, many popular DBMSs have been hybrid object-relational.
不过，许多年来，很多流行的DBMS都是对象和关系的混合体。
Either way, you have to write or generate code to do the object-relational mapping.
无论采取哪种方式，都必须编写或生成代码来进行对象关系映射。
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。
Please note that this article will not go into the general topic of object-relational mapping.
请注意，本文将不深入讨论对象-关系映射这一一般性的主题。
Gone are the days of writing your own object-relational mapping (ORM), logging, or testing framework.
手动编写对象关系映射(ORM)、日志或测试框架的时代已经一去不复返。
The query syntax is part of Erlang itself, while the data model is akin to an object-relational DBMS.
查询语法是Erlang的一部分，数据模型类似于对象-关系数据库管理系统。
It does not store documents as plain text and does not map XML to relational or object-relational tables.
它不将文档存储为纯文本，也不将XML映射到关系或对象关系表。
I'll start by describing what an object-relational mapper (ORM) is and how to create a one-to-many relationship.
我将首先介绍什么是对象关系映射器(object - relationalmapper,ORM)，以及如何创建一对多关系。
The service persists order information in a relational database using an object-relational mapping framework.
服务使用ORM框架将订单信息持久化到关系数据库里。
You can think of XMLBeans as an object-relational (or) mapper — but for XML files rather than relational databases.
可以将XMLBeans看作对象-关系(OR)映射器，但这是针对XML文件而非关系数据库而言的。
Hibernate is one of most popular object-relational mapping (ORM) engines providing data persistence and query services.
Hibernate是最流行的对象关系映射(ORM)引擎之一，它提供了数据持久化和查询服务。
It goes further by mentioning that it could be any type of database: relational (object-relational) or non-relational.
并且还进一步提到可以是任何类型的数据库：关系(对象-关系)或非关系的。
Django comes with its own object-relational mapper (ORM) library that supports dynamic database access through a Python object interface.
Django提供了自己的对象关系型数据映射组件(object - relationalmapper,orm)库，它可以通过Python对象接口支持动态数据库访问。
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。
Part 1 of this two-article series covers several basic best practices for Hibernate and object-relational mapping (ORM) tools in general.
本系列包含两篇文章，第1部分讨论了Hibernate和其他对象-关系映射(ORM)工具的几个基本最佳实践。
Follows the named-query style, targeted to match or exceed the capabilities of existing object-relational mappers and persistence solutions.
遵从命名查询的风格，目标是等同或超过现有对象-关系映射器和持久化解决方案的功能。
then why can't we use XML as our first class data and programming model, given all the problems we learned the hard way with object-relational or OX mapping?
那么，考虑到我们在使用对象关系或OX映射的过程中发现的种种问题，为什么我们不能使用XML作为首选数据与编程模型呢？
This article assumes that you're familiar with basic EJB 3.0 and object-relational (or) mapping concepts (see Resources for more information on both subjects).
本文假设您熟悉EJB 3.0基本概念和对象关系(OR)映射基本概念。(若需了解这两个主题的更多信息，请参阅参考资料)。
Consider an example where a DBA knows the problem is a poor-performing query, but that query was generated by a framework, using an object-relational mapping technology.
考虑这样一个示例：DBA知道问题根源是查询的性能较差，但此查询是由框架生成的，使用了对象关系映射技术。
Another limitation of local transactions is that you cannot use them with traditional object-relational mapping (ORM) frameworks such as Hibernate, TopLink, or OpenJPA.
本地事务的另一个限制是不能将它们与传统的关系对象映射(ORM)框架，比如Hibernate、TopLink或OpenJPA，一起使用。
Unfortunately, because of this, we could not reuse the code we were using from EJB2 CMP ORM, so we needed to manually code the object-relational mapping for the JDBC queries.
不幸的是，我们因此不能重用在 EJB2CMPORM 中使用的代码，所以我们需要手动地编写用于JDBC查询的对象关系映射。
Stonebraker was looking to achieve this capability by applying OO principles in working on an object-relational DBMS (ORDBMS), which resulted in the emergence of Illustra in 1994.
Stonebraker 寻求通过在处理对象关系型 DBMS (ORDBMS) 时应用OO原则来实现该功能，这引发了 1994 年 Illustra的出现。
Proper care must be taken to ensure that object-relational database mappings are correct, and ideally the code should be designed to minimize the changes necessary when requirements change.
必须注意确保对象到关系数据库映射的正确性，理想情况下，应该将代码设计成在需求变更时所需的更改最小。
The Session object provides the programmer with a transient storage layer, much like those found in traditional object-relational mapping tools, and also serves as a link to a particular workspace.
Session对象为程序员提供了一个临时的存储层，它非常像传统的对象关系映射工具中可以看到的层，而且还可以将它看作到特定工作区的连接。
Learning from past support issues, you've noticed that you receive many frantic customer calls related to a problem stemming from incorrect JVM versions and incorrect object-relational mapping (ORM).
从过去的支持问题中，您注意到许多急切的客户电话都与错误的JVM版本和错误的对象关系映射(ORM)所导致的问题有关。
Object-relational mapping for creating models
用于创建模型的对象关系映射
Object-relational mapping is the best solution when you have a legacy schema, perhaps not defined with an object model in mind.
对象关系映射是使用遗留模式(可能定义时没有考虑对象模型)时的最佳解决方案。
There is an object relational mapper out there that is a hidden gem.
那里有一个对象关系映射程序，它是一块隐藏的宝石。
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