In the case where a retrieved column has a value of SQL NULL, then no XPath variable reference expression is assigned to such a value.
如果检索到的列值为SQLNULL，那么不会给此类值分配任何XPath变量引用表达式。
Note that the syntax of using the $treeFarm context attribute reference is identical to the $treeList variable reference examined earlier.
要注意，使用 $treeFarm上下文属性引用的方法和前面分析的 $treeList变量引用一致。
Therefore flow developers should not use routing decisions in which variable reference expressions map onto name columns whose values may be NULL.
因此，流开发人员不应该使用变量引用表达式映射到名称列可能为 NULL 的路由决策。
If you don't declare a tunnel parameter because it is not used in that template, then you don't have to worry about its name clashing with any variable reference in that template.
如果没有在模板中声明通道参数，而模板正好又没使用它的话，就不用担心和模板中的变量引用发生名称冲突。
They hold only one piece of data: a string, a number, the undefined value, a reference to another variable.
它只保存一段数据：一个字符串、一个数字、未定义的值以及对另一个变量的引用。
This means that you can reference this variable only in the test that it is declared but not across other tests.
这意味着您只能在声明它的测试中引用该变量，而不是在其他测试之间引用它。
You can define a variable in one test to capture and store test data and then reference the test variable in a second test.
您可以在一个测试中定义一个变量，以获取和存储测试数据，然后在第二个测试中引用测试变量。
Because implicit objects are declared automatically, we need only use the reference variable associated with a given object to begin calling methods on it.
因为隐式对象是自动声明的，所以我们只需要使用与一个给定对象相关的引用变量来调用其方法。
In the change that follows, it stores a reference to the view part instance in a class variable.
在随后进行更改时，将视图部件实例的引用存储到一个类变量中。
To reference a given DB2 instance from a command line interface, use the environment variable DB2INSTANCE.
要想从命令行接口引用给定的DB2实例，应该使用环境变量DB2INSTANCE。
For example, a keyword can be extended as a unit of weight in a recipe, as a part name in a hardware reference, or as a variable in a programming reference.
比方说，一个关键字可以扩展成菜谱中的重量单位、硬件参考中的部件名称或者编程参考中的变量。
Next time you need to generate the declaration of a local variable, you can go back to this source and use it as reference.
下一次需要生成本地变量的声明时，您可以回到此源，并以此为参考。
The READ privilege is required to reference a global variable and the WRITE privilege is required to modify the value of a global variable.
READ权限用于引用全局变量，而WRITE权限用于修改全局变量的值。
Set the wlm_classification_file environment variable to reference the workload classification document.
设置 wlm_classification_file环境变量以引用工作负载分类文档。
Line 22 instantiates the site variable using two arguments: the first argument contains a reference to an OleFrame, and the second argument contains a string that identifies the ActiveX control.
在第22行上，通过使用两个参数来实例化site变量：第一个参数包含对OleFrame的引用，第二个参数包含标识activex控件的字符串。
To reference Coldfusion variables in a Coldfusion file, you need to add #variablename# around the variable.
为了在Coldfusion文件中引用 Coldfusion变量，必须在该变量的两边加上 #variablename#。
Under the covers, Python creates an integer object and assigns the variable to reference the new object.
在后台，Python将创建一个整数对象，并将对新对象的引用赋值给变量。
That's the reason the second version of the HSQLDB plugin defines a new classpath variable to hold a reference to hsqldb.jar.
这就是为什么在第二版hsqldb插件中定义了一个新的classpath变量来保存对hsqldb . jar的引用。
Spring comes with a variable resolver implementation class that lets you reference Spring managed beans in JSF expressions.
Spring附带了一个变量解析器实现类，允许您在JSF表达式中引用 Spring托管Bean。
You should be familiar with the code used to populate the global flexApp variable with a reference to the Flex application.
您应当十分熟悉用于填充带有Flex 应用程序引用的 flexApp全局变量的代码。
Calling the object reference shown in Listing 9 as a variable automatically calls the __invoke magic method, making the class itself act as a closure.
将清单9中所示的对象引用调用为变量将自动调用__invoke魔术方法，使类本身用作闭包。
The inline refactoring can inline a reference to a variable or method.
Inline重构可以内联对变量或方法的引用。
The convert function takes the variable containing the input string, as well as a reference to the Label widget as parameters, so that it can change the value shown by the Label.
convert以包含有输入字符串的变量以及对Label窗口小部件的引用作为参数，以改变Label所显示的值。
Rule5 USES the rate2 variable to invoke this partner reference.
Rule5使用rate2变量来调用该伙伴引用。
Note that a reference to AppConfig is also passed to the subroutine so other variable changes can be triggered by one single change.
对AppConfig 的引用也被传送到子例程，所以单个更改会触发其它变量更改。
The increment function should be called with a reference to the variable instead of the value of the variable.
应该用变量的引用调用increment函数，而不是使用变量的值。
If you work with large arrays or hashes and use them as arguments to functions, use a reference instead of the variable directly.
如果使用大型数组或hash表，并使用它们作为函数的参数，那么应该使用它们的一个引用，而不应该直接使用它们。
The rule project can reference the CEIEventBOM module and define a variable with type ilog.connector.ibm.runtime.EventContainer to emit CEI events to Process Server.
规则项目可以引用 CEIEventBOM模块并定义一个ilog.connector.ibm.runtime.EventContainer类型的变量，从而把CEI事件发送给 Process Server。
GCC permits the identification of a type through the reference to a variable.
GCC允许通过变量的引用识别类型。
To facilitate this, the plug-in class implements the singleton pattern: It stores a reference to itself in a private class variable.
为了使这一点更方便，插件类实现单模式（singletonpattern）：它在私有类变量中存储一个自身的引用。
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