This article described three approaches to implementing a surrogate key as primary key.
本文描述了实现作为主键的代理键的三种方法。
Constraints such as primary key - foreign key relationships and uniqueness of values are not possible on particular values of an XML document.
不能对XML文档的特定值执行限制，比如主键—外键关系和值的唯一性。
The descriptor can also provide the same metadata information about the entities as annotations, such as primary key field, and any mappings between objects.
描述符也可以提供与注释相同的有关实体的元数据信息，如主键字段，以及对象之间的任何映射。
That document promoted primary health care as the key to attaining an acceptable level of health for all people in this world.
该宣言促进初级卫生保健，将之作为使世界所有人民的健康水平达到令人满意的水平的关键。
The use of the class as the primary means of abstraction is key to object-oriented framework design.
作为抽象的主要方法，类的使用在面向对象框架设计中是很关键的。
This is just a basic two-column table with the template name as the primary key, so no two templates can have the same name.
这只是一个由两列构成的基本的表，以模板名作为主键，所以任何两个模板都不能具有相同的名称。
The conference adopted the Alma-Ata Declaration, which defined primary health care as the key to achieving the goal of "health for all by the year 2000".
会议通过了《阿拉木图宣言》，确定了初级卫生保健是“到2000年实现人人享有卫生保健”目标的关键。
A dimension table needs a generalized key as the primary key data; this becomes the foreign key in the fact table.
维度表需要作为主键数据的通用键；这将作为事实表的外键。
For the sake of simplicity, consider VARCHAR as the default type for every column that is not a primary or a foreign key.
为了简单起见，考虑把VARCHAR作为除主键和外键外的所有列的默认类型。
We will include this Key as an attribute of AcmeMembership, mark it as a Primary Key, and specify the strategy the Google App Engine runtime will use to populate it automatically with unique values.
我们将会将该Key作为AcmeMembership的属性添加，并将其标记为一个主键，并指定GoogleAppEngine运行时的策略，它将会自动填充上唯一的值。
Given the view's definition, you created a metadata object consisting of four columns and designated one column as the primary key for purposes of your work.
提供了视图定义后，可以创建由4个列组成的元数据对象，并指定一个列为主键以进行以后的工作。
If not specified, the default multiplicity is 0.. n, which means as many mappings as are possible, and which is not relevant here, since a primary key is meant to be unique.
如果没有指明，默认的多重性是从0到n，这表示映射尽可能多，在这里这是无关的，因为主键意味着唯一。
If an error message appears stating that a primary key is not defined, select empno as the primary key.
如果出现一条出错信息，声称没有定义一个主关键字，那么您可以选择empno作为主关键字。
Inter-table relationships, primary key columns, and other information about the target data is specified through the metadata object as well.
表间关系、主键列和其他有关目标数据的信息也是通过元数据对象指定的。
As shown in Figure 16, the bulk load operation results in two of the sample records being sent to the reject link because they violate the unique primary key constraint.
如图16所示，两个示例记录中的批量加载操作结果被发送给拒绝链接，因为它们违反唯一的主键约束。
Beijie is the city's elite primary school, designated as a provincial-level "key" school, boasting the best facilities and the finest teachers.
北街是全市最好的贵族小学，被定为省级“重点”学校，一向以其优越的硬件设施和师资力量而自豪。
As noted previously, of course, the primary key logic found in the application isn't bulletproof.
当然，如前所述，应用程序中的主键逻辑并不是很保险。
As a result, if you rely on database sequences (such as for automatic primary key generation), it's likely that an identical primary key will show up across a set of databases.
因此，如果您依赖于数据库序列(如自动主键生成)，很有可能在一个数据库集中将出现同一个主键。
An alphanumeric part number. This part number is unique and could suffice as the primary key.
字母数字零件号此零件号惟一并且可以用作主键。
Similarly, relational database rows are also unique, so long as they are identified by primary key values.
同样，关系数据库中的行也是惟一的，它们由主键值标识。
Entities that share some attributes, including an identifier (primary key), but not others may be modelled as having a common supertype.
一些实体具有某些共同的属性，比如标识符(主键)，而其他属性不同，这些实体可能具有共同的超类型。
Nettles are key to the survival of butterflies, as they are the primary food source for many caterpillars including those of the comma, tortoiseshell and peacock.
荨麻是蝴蝶生存的关键。它是很多幼虫包括蛱蝶科的如花斑蛱蝶，孔雀蛱蝶等的食物来源。
Products often share only a few attributes, such as a primary key, a name, a short description, and a long description.
产品常常只有很少几个共有的属性，比如主键、名称、短描述和长描述。
We also use a primary key class, constructed from the values comprising the EJB primary key, to make it easy to specify the primary key as a single entity.
我们还使用由组成ejb主键的值构建的主键类使得把主键指定为一个单独的实体很容易。
To enforce that specified keys are unique with respect to the specific time period, specify the primary key constraint BUSINESS_TIME WITHOUT OVERLAPS as the last item with the list of other keys.
要确保指定的键在特定时间段内是惟一的，可以指定主键约束BUSINESS_TIMEWITHOUTOVERLAPS作为包含其他键的列表中的最后一项。
If a primary key is specified in the CREATE TABLE statement, the first column of the primary key is used as the distribution key.
如果在CREATEtable语句中指定了一个主键，那么主键的首列会被用作分配键。
Version 2.0 of the EJB specification defines a primary key class as any class that is a legal value type in RMI-IIOP.
EJB规范的 2.0版将主键类定义成任何是 RMI-IIOP中合法值类型的类。
On the primary key Tasks page, select deptno as the primary key for the Department entity.
在主要关键字Tasks页面中，选择deptno以作为Department实体的主要关键字。
You saw how the findByPrimaryKey causes the container to retrieve a row in a database using the primary key of the EJB component as the primary key of the row in the database.
您已看到了findByPrimaryKey 子句如何让容器使用EJB组件中的主键作为数据库中行的主键来检索数据库中的行。
You saw how the findByPrimaryKey causes the container to retrieve a row in a database using the primary key of the EJB component as the primary key of the row in the database.
您已看到了findByPrimaryKey 子句如何让容器使用EJB组件中的主键作为数据库中行的主键来检索数据库中的行。
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