通常，源表的主键值是一个很好的选择。
Usually, the primary key field of the source table makes a good choice.
获取由主键值指定的行。
Gets the row that contains the specified primary key values.
它们为ID属性使用数据库生成的主键值。
They use database-generated primary key values for the ID attribute.
第四，调用KeyManger来获得主键值。
同样，关系数据库中的行也是惟一的，它们由主键值标识。
Similarly, relational database rows are also unique, so long as they are identified by primary key values.
注意，这假设从不更新键列；一旦一行存在了，它的主键值就不变了。
Note that this assumes that key columns are never updated; once a row exists, it is immutably tied to its primary-key value.
进一步地指定独一的主键值（标为 @Id注释），取决于生成值的数据库。
To specify further that the unique key attribute (marked with @Id annotation) will rely on your database to generate its value.
Find方法会查询你的Employee表中的记录，看谁的主键值为18。
The find method will query your Employees table for the record whose primary key is 18.
如果将要在下载流中包含一行，则在删除列表中不能包含与此行主键值相同的行。
If a row is to be included in the download stream, you need not include a row with the same primary key in the delete list.
在图3中，您要使用ChangeColumn对话框窗口来编辑已存在表格的主键值。
In Figure 3, you were modifying the primary key of an existing table using the Change Column dialog window.
使用该表来分析一个用例，角色与用例根据主键值来进行定型：简单的，平均的，或者复杂的。
To analyze a use case by using this table, the actors and use cases are stereotyped with keys: simple, average, or complex.
您还可以选择，定义主键值，来在定义表格和添加主键值列本身时使用identity值生成。
Alternatively, you could define the primary key to use Identity value generation at the time you were defining the table and adding the primary key column itself.
使用DB 2IdentityValueGeneration功能来创建独特主键值的表格。
Tables that use the DB2 Identity value Generation capability to create unique primary keys values.
INSERT_UPDATE将新的输入数据添加到表中，或者用具有匹配主键值的输入数据更新现有的行。
INSERT_UPDATE adds new input data to the table, or updates existing rows with input data that has matching primary key values.
简单地运行两次会产生错误，因为相同的星星名称（作为表的主键）使用了两次，则会由于重复的主键值导致错误。
Simply running it twice will produce an error, because the same star names (which are the primary key for the table) are used again, causing an error with duplicate primary key values.
设置主键值以使用IdentityValueGeneration功能，有一些很有意思需要注意的地方。
Setting the primary key to use the Identity Value Generation function has some other interesting things to be aware of.
解决方案 有：sharding （基于主键值讲数据表分散到多个数据库中），复制，利用弱语义一致性的简化数据库。
Solutions include sharding (splitting up a table across multiple databases based on the primary key), replication, and usage of simplified databases with weakened consistency semantics.
例如，在从主键序列表中检索并缓存下一批可用的键值时。
An example would be retrieving and caching the next available batch of keys from a primary key sequence table.
否则，从序列获取一个新的键值，用它作为维表中新条目的主键和事实表中的外键。
Otherwise, a new key value is taken from the sequence and used for both, a new entry in the dimension table and as a foreign key in the fact table.
第三步：用合适的分离标记替换rawdata . xml中的主键以及外键值。
Step 3: Replace the primary and foreign key values in rawdata.xml with appropriately abstracted tokens.
insertJSON需要两个输入参数：主键的惟一键值与json格式的行数据。
InsertJSON expects two input parameters: the unique key value for primary key and the row data in JSON format.
由于每一行都具有唯一的主键，因此任何两行都不会共用同一键值。
Because each row has a unique primary key, no two rows share the same key value.
由于每一行都具有唯一的主键，因此任何两行都不会共用同一键值。
Because each row has a unique primary key, no two rows share the same key value.
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