The use of these specific columns ensures that the related column values are not inadvertently set to NULL.
这些特定列的使用能够确保相关的列值不会意外设置为NULL。
The "name" column will be a CHAR (30), set to NOT NULL, and have a unique index on it.
“name”列的类型是CHAR(30)，不允许为空，而且根据此列建立了一个索引。
The opendir() and readdir() functions both return NULL if a problem occurs and the errno global variable is set to indicate what went wrong.
在出现问题时，opendir()和readdir()函数都会返回NULL，并且将设置全局变量 errno 的值，以指出所出现的错误。
The above error can occur if the Sybase existing table definition declares one of the columns to be NOT NULL but there is no value for that column in one of the records of the result set.
如果sybase现有表定义声明某一列为NOT NULL，但是在结果集中的某一行记录在那一列没有值，就可能发生上述错误。
To avoid this problem, you can define a complex type to wrap the value type and set the complex type to be null to indicate a null reference.
为了避免这个问题的出现，您可以定义复合类型来封装数值类型，并将这个复合类型置为空来表示空引用。
Columns containing NULL do not match any values when you are creating an inner join and are therefore excluded from the result set.
当创建内部联接时，包含NULL的列不与任何值匹配，因此不包括在结果集内。
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。
The parent container should be using a null layout so you can randomly set the location of your Ball panel.
父容器应使用空布局，你可以随意设置你的球面板的位置。
Through pointer mapping set and fault model, it can detect null pointer dereference faults automatically and increases the testing efficiency.
通过指针映射集和故障模型，可以自动检测空指针引用内存故障，提高了测试效率。
The relation between threshold, weight and matching degree is also discussed. In order to make the querying friendlier, the method to avoid returning null set and corpora is also presented.
研究了权重、阈值和匹配度之间的关系，提出了避免查询结果为空集或全集的方法，使得查询更加人性化。
Prior to the DB2 for I 6.1 release, SQL Update and Insert statements could use an indicator variable with a value of -1 to set a null capable column to the null value.
在DB 2fori 6.1发布之前，SQLUpdate和insert语句能够使用一个值为- 1的指示符变量，将支持空值的列设置为空值。
Here, the namespace is set to namespace, but it could just as easily have been left blank or null if no namespace were wanted.
此处名称空间设置为NAMESPACE，但若不需要名称空间，直接将此处留空即可。
This rule set contains some of the more questionable checks, including assigning null to a variable, multiple return points from a method, and importing from the sun packages.
这个规则集包含一些更有问题的检验，其中包括把null赋值给变量、方法中有多个返回点，以及从sun包导入等。
For items that have two paths to send, there is a null byte after the first path, and it is followed by the second path, with the pathlen field of the message being set to the total length.
对于有两个路径需要发送的项，那么在第一个路径之后有一个null字节，其后紧跟第二个路径，并且消息的pathlen字段被设置为总长度。
It is very important that you have the correct null modem cable with you to set up the debugging environment.
为了设置调试环境，拥有正确的零调制解调器电缆是非常重要的。
If times is a null pointer, the access time and the modification time are both set to the current time.
如果times是一个空指针，访问时间和修改时间被设置为当前时间。
The corresponding field in the business object is automatically set to null.
业务对象中的对应字段将自动设置为空。
If the accept header is null, this means that the client accepts any type, so the default is set.
如果Accept标头为空，这意味着该客户端可接受任何类型，因此设置了缺省值。
Each root either refers to an object on the managed heap or is set to null.
每个根或者引用托管堆中的对象，或者设置为空。
Whenever you are adding an item to a result set, and that item does not contain one of the requested selection properties, null should be returned instead.
在将条目添加进结果集中时，如果条目不包含请求的选择属性之一，那么应该返回null。
This may be in the form of specific set values (for example, all 9's or 'Do Not Use') or blank values (where a blank represents a keystroke distinct from a null value).
这可能以特定的设置值(例如所有的9或‘DoNotUse’)或空白值(一个空白表示一个按键，这不同于一个null值)的形式出现。
This will return null only when focus has been set to "no component."
这样，只有当焦点被设置成“无组件（no component）”时才会返回空。
Additional code could be added to perform a check to see if the new value is a user-defined value indicating that the database value should be set to NULL or the default value defined for the column.
可以添加额外的代码来执行一个检查，检查新值是不是一个用户定义值，用以表明数据库值应该被设置为NULL或针对该列定义的默认值。
However in this case, the link's ref attribute will be set to the value "null," and the link's text content will be hidden unless a flag to show null-link content is set to true.
但是，在这种情况下，这个链接的ref属性会设置为“null”值，而且链接的文本内容会隐藏起来，除非将显示空链接内容的标志设置为true。
For this test, the Ex versions of the strsafe functions set NULL on failure and 0xfe as the fill byte.
在测试中，调用ex版本的strsafe系列函数的程序会在调用失败时把缓冲区设为NULL，并以0xfe作为填充字节，代码如下。
If type is set to null, it defaults to mysqli, or you can change it to mysql.
如果type被设为null，它就会默认为mysqli，也可以将其更改为mysql。
If the pointer for an overlapped operation is set to NULL, DeviceIoControl will work in a blocked (synchronous) way.
如果重叠操作的指针设为NULL，那么DeviceIoControl将以阻塞(同步)方式工作。
The last set includes a colon (:) between the variable name and the substitution operator, which adds the check to see if the variable is NULL, as well.
后一组定义在变量名和替换操作符之间包含一个冒号(：)，这会额外检查变量是否是NULL。
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。
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。
应用推荐