IS NULL IS NOT NULL 是否为空值
param is not null 参数不能为空
Event title is not null 扎堆的标题不能为空
not is null 不为空
If the form input field is not null, set the payload you receive as the widget value, as shown in Listing 14.
如果表单输入字段不为空,将小部件的值设为接收到的负载,如清单14所示。
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。
If the value of the transportTModelKey parameter is not null, then a transport categorization keyedReference is added; its value is the value of the transportTModelKey parameter.
如果 transportTModelKey 参数的值不为空,就添加一个传输类别 keyedReference ;它的值即是 transportTModelKey 参数的值。
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