IS NOT NULL

If active_start_date is not null, the date must be greater than or equal to19900101.

如果active start date不为null，则日期必须大于或等于19900101。

Array is not null, the last entry in the array will be the property descriptor that describes the list property that is another list of items.

数组不为空，则该数组中的最后一项将为属性说明符，它描述作为另一个项列表的列表属性。

Next, check to make sure the username was entered and is not null.

然后，检查并确保输入的用户名不为null。

For example, if you are creating a Customer table and the CustomerID is marked as not null, then when you define the primary key, CustomerID will show as a candidate column.

例如，如果您要创建一个Customer表并且CustomerID被标记为not null，则当您定义主键时，CustomerID将会显示为备选列。

But as we hope we've shown in the table, that really represents an array with a single element whose value is null, not a null array.

但是，正如我们希望的，在表中已经显示，它真正表示的是含有单一元素的数组，元素的值为“零”（null），而不是一个“零”（null）数组。

Error: The input parameter '% s' is not allowed to be null.

错误：输入参数''%1！''不允许为空。

If the thread local username is null, then the_appUsername value is checked and it is used if it is not null.

如果线程本地用户名为空，则检查appUsername值并使用它（如果不为空）。

The first one asserts that the calculator instance object is not null, i.e.it exists.

第一个宣称这个计数器实例对象不是空，就像它实际存在一样。

This field is blank padded and is not null terminated.

该字段用空格填充，且不以空字符结尾。

The uniqueness is ensured on the NOT NULL values.

确保NOT NULL值的惟一性。

A general, good practice is not to allow null ( that is, no value) columns in a relational database, because when you attempt to read such a column, you get a null value exception.

通常，一种优秀的实践就是不要在关系数据库中使用null（即没有值）列，因为当您试图读取这类列时，您将得到一个null值异常。

Initially, this routine checks if the passed inquiry context is not NULL and is for a group member inquiry.

这个例程首先检查传递的查询上下文是否非NULL，以及是否是用于组成员查询的上下文。

If the value is not null, it is converted into an int value

如果值尚未为null，那么它会被转化为一个int值

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。

If this column is not sorted, a null value is returned, and the@ formulas in the agent will not continue executing.

如果该列未进行排序，将返回空值，代理中的@formulas将不再继续执行。

If the input binding parameter is not NULL, then it means that the endpoint resides on a remote host.

如果输入绑定参数不是NULL，就意味着端点在远程主机上。

The third tab in the Twitter panel, Following, first checks whether the following object is not null.

Twitter面板内的第三个选项卡是Following，它先是检查following对象是否为null。

It's shorthand for saying" call the encodeAsHTML() method only if airline is not null; otherwise just return an empty string.")

它可以快捷地表示“只有在airline不为null时才调用encodeAsHTML（）方法，否则返回空字符串”）。

If the customer number is not null, that is, the customer is already known, the left hand path is followed ( 2), and the customer data is retrieved from the customer registration service ( 3).

如果客户编号不为空，即客户是已知客户，则遵循左侧的路径（2），并从客户注册服务中检索客户数据（3）。

The unit test methods first verify that the object provided is not null, and then perform one or more very basic actions on the object.

单元测试方法首先验证所提供的对象不是空的，然后对该对象执行一个或多个非常基础的操作。