This function returns a pointer to the value in the environment or NULL if there is no match.
这个函数会返回一个 指向环境中的值的指针，或者如果不匹配则返回 NULL。
If the remote data source cannot handle the null value in a host variable or parameter marker, any function that involves binding a nullable value has to be evaluated locally.
如果远程数据源不能处理主机变量或参数标记符中的NULL，那么任何需要绑定一个可以为空的值的函数都必须在本地计算。
The current implementation, the ibm_db2 driver, does not gracefully handle NULL variables as arguments to the execute function; hence we use an unobtrusive workaround.
当前实现ibm_db2驱动程序不能适当地将NULL变量作为参数来处理，以便执行函数；因此我们使用一个非强制性解决方案。
Note that we specify HANDLESNULLS so that IDS allows our function to return a value when the column value is NULL.
注意，我们指定了HANDLESNULLS，因此，当列值为NULL时，IDS将允许函数返回一个值。
The regmatch(re, text) function compares the regular expression to the text, yielding either Null for no matches or an array of pairs of integers (a two-element array).
regmatch(re,text)函数将比较正则表达式和文本，如果没有匹配的话就生成Null 值，否则生成一个由成对整数组成的数组（双元素数组）。
The NULL argument to spe_context_run would become a third argument to the main function on the spe; there's no need for it in this example.
spe_context_run的NULL参数会成为spe上main函数的第3个参数；因此在这个例子中不需要使用它。
After a quick test of your new structure (namely, it's not NULL), continue to make the call using the call_usermodehelper_exec function.
快速测试新结构(即，非null)后，使用call_usermodehelper_exec函数继续调用。
Each of the inputs to the function should be validated and your requirements should determine the responses to null or empty string inputs.
应验证函数的每个输入并且应由您的要求来确定如何响应null或空的字符串输入。
The constructor function has no parameters and returns an instance of the type with all of its attributes set to null values.
构造函数没有参数，并且返回的类型实例中的所有属性都为空。
If you don't have a window or you don't want to process the timer messages in the window procedure, you must pass NULL to the function in place of a window handle.
如果你没有窗口或者是你不想在窗口过程中处理定时器消息，你必须在函数的窗口句柄的地方传递一空值。
If this function returns NULL, no exception has been raised and the caller should assume no current thread state is available.
如果这个函数返回NULL，没有抛出异常，调用者会假定当前线程状态无效。
The cause of null pointers can be varied, but generally it means that either you haven't initialized an object, or you haven't checked the return value of a function.
由于空指针能够被改变，但通常它意味着你不能初始化一个对象或者你不能检查一个函数中的返回值。
The handle of the window that currently has the Clipboard open if the function is successful; otherwise NULL.
如果函数执行成功，则返回当前打开剪贴板的窗口的句柄；否则返回NULL。
The MAX function returns the highest value in a column. NULL values are not included in the calculation.
使用MAX函数可以将一列中的最大值返回出来。NULL值不包括在内。
A trailing backslash is required. If this parameter is NULL, the function USES the root of the current directory.
需要有反斜线。此参数若为空，函数使用当前目录的根目录。
If the app doesn't want to do anything special for this ID, it returns NULL, and the window function senses this and news up the appropriate default object.
如果程序不需要这个ID，则返回NULL，窗口函数根据返回值创建恰当的默认对象。
For the first version of this function, if this value is NULL, the entire client area is selected and output is still clipped to the window.
在函数的第一种版本中，如果该值为NULL，整个客户区被选中，输出仍剪切到窗口。
As a special case, if fp is NULL, this function causes all output streams to be flushed.
作为特殊情况，如果fp是NULL，这个函数会把所有输出流刷新。
This value is characterized as the unique function that satisfies efficiency, complete symmetry, the quasi-null player property and additivity.
这种价值作为唯一的方程的特点是，满足有效性、完全对称性等特点。
If the function succeeds, the return value is the handle to the hook procedure. If the function fails, the return value is NULL.
如果方法执行成功，返回钩子子程的句柄。如果失败，返回空。
By employing the pole-null representation, we demonstrate that the lateral shift is closely related to the null of the reflection function.
利应用极点-零点描述理论，我们发现光束的位移与光束在该结构中的反射系数函数的零点密切相关。
By employing the pole-null representation, we demonstrate that the lateral shift is closely related to the null of the reflection function.
利应用极点-零点描述理论，我们发现光束的位移与光束在该结构中的反射系数函数的零点密切相关。
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