The expression may be a null value if the parameter is nullable.
如果参数可为空值，则表达式可能为空值。
What if someone inadvertently passes in a null value for the Class parameter?
如果有人不经意地为Class参数传入一个null值会怎么样呢？
I'd like to change the null value from my objects to a reference, if I can.
我想从我的空值改为参考对象，如果我可以。
That means a reference type can have a null pointer, but a value type cannot have a null value.
这意味着引用类型可能有空指针，但是数值类型不能有空值。
The axiom of fuzzy null value join dependency is introduced and its availability is proved.
给出模糊空值连接依赖的公理系统，并且进行了有效性证明。
Click on CustomerRecord , and you will see a non-null value appear as the value in the parameters area.
单击CustomerRecord，您会看到出现一个非空值作为参数区域中的值。
Neither a key nor a value can be null (if a null value in a dictionary is required, use "NSNull" instead).
密钥或值可能是null(如果需要字典中的null值，请使用NSNull替代)。
It's the situation where, for instance, someone passes a null value to a method not coded to handle nulls.
比方说，把null值传入一个并未编写如何处理null值的方法中，这就是一种边界情况。
If the corresponding class, field, or method is not generic, a null value is passed when calling the method.
若相应的类、字段或方法非泛型，则在调用方法时将返回null值。
When you work with strings with a null value, the result of the concatenation depends on the session Settings.
处理具有空值的字符串时，串联结果取决于会话设置。
As Linda stated, the behavior is simple: If someone calls push with a null value, the stack should throw an exception.
正如Linda所说，行为很简单：如果有人对null值调用push，那么栈应该抛出一个异常。
Otherwise, the shell interprets the trailing text as part of your variable name — and most likely returns a null value.
否则，Shell将把尾随文本解释为变量名称的一部分——并且很可能返回一个空值。
This line also traps for a null value and converts it to an empty string to prevent problems during later processing.
这一行代码也会专门处理null值，它将null值转换为一个空字符串以避免后面的处理出现问题。
When I concatenate these fields I am getting some of the fields as null cause as it contains at least one null value field.
当我连接这些字段时，我得到一些字段为空因为它包含至少一个空值字段。
In addition, if you have a table with many columns that aren't typically used, you are also wasting disk space with NULL value fields.
此外，如果您有不常用的含多个列的一个表，您也在通过null值字段浪费磁盘空间。
Without this requirement, the itemNumber column isn't guaranteed to be unique because multiple columns could be assigned a NULL value.
如果没有这个要求，itemnumber列就无法保持惟一，因为多个行都可能被分配null值。
When you want to determine whether a given row includes a comment, you no longer need to check for a null value in the COMMENT column.
确定某一个行是否包含注释时，不再需要检查COMMENT列的null值。
By default, a column can contain a NULL value, but if you don't want that, you can append the "NOT NULL" postfix to the field definition.
默认情况下，列可以包含null值，但是，如果不想这样，可以在字段定义中附加“NOT NULL”后缀。
Listing 3 initializes a new Zend_Soap_Server object in non-WSDL mode, passing a null value as the first argument to the object constructor.
清单3传递一个null值到对象构造函数的第一个参数，以非wsdl模式初始化了一个新的Zend_Soap_Server对象。
If the former is true, then the indicator variable for that column is set to -1 which results in the column being updated with the null value.
如果是前一种情况，那么该列的指示符变量被设置为- 1，这导致该列被更新为空值。
Aiming at incomplete information of indicator system, this paper sets up null value dealing model of indicator system based on rough set.
针对指标体系信息不完备的特定问题，建立了基于粗糙集的指标体系空值处理模型。
An error could occur in the first test and prevent the variable's value from being set, thus resulting in the other tests receiving a null value.
错误可以发生在首个测试期间，并阻止您去设置变量的值，并导致其他的测试接受一个空值。
This is a good start, but you need to provide something other than a null value when the Tree Viewer asks for the column text for a particular item.
那是一个很好的开始，但是当为了一个特殊的条目，TreeViewer需要栏目文本时，您需要提供一些内容，而不仅仅是一个零值。
The target object with all substitutions performed. This property can have a NULL value when an error is encountered in the substitution process.
执行了所有替换的目标对象。在替换过程中遇到错误时，此属性的值可以是NULL。
IllegalArgumentError is thrown every time an argument is not considered valid, for example, when a null value is passed to a method as a parameter.
IllegalArgumentError在每次认为参数无效时抛出，例如，将null值作为参数传递给方法。
For fields without signatures, I'll just use a null value. Finally, the field type is an instance of the TypeDescription class, also shown in Listing 1.
对于没有签名的字段，将只使用null值。
This new validation will enforce NOT null column constraints by rejecting null values, but only in situations where your database would reject a null value.
这种校验会通过拒绝空值，强迫加上非空[notNULL]字段的约束，但是也只有在这种情况下，你的数据库会拒绝空值。
When you attach a unique constraint to a column allowing null values, you ensure that at most one row will have a null value in the constrained column.
当将唯一约束附加到允许空值的列时，请确保在约束的列中最多有一行包含空值。
When you attach a unique constraint to a column allowing null values, you ensure that at most one row will have a null value in the constrained column.
当将唯一约束附加到允许空值的列时，请确保在约束的列中最多有一行包含空值。
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