查询词典 nullable

Null coalescing operator to learn a useful tip/trick on how to work with nullable types that are passed as arguments like this.

关于 nullable 类型的使用请阅读我的另一篇相关文章。

Please notice that nullable has no effect on the containers interface except for is_null( functions.

请留意， nullable 并不影响容器的接口除了 is_null

Columns not marked as nullable will automatically raise exceptions if you attempt to persist an instance with a null value.

如果你试图对没有被标为可空的列赋空值，将会自动抛出异常。

Syntax indicates that UnitPrice property is a nullable value

表达式表明了UnitPrice属性不可为空值

The framework already includes controls for editing string, numbers, enums, date/time with calendars and boolean with checkboxes (of 3 states, if it is nullable), so creating basic forms is only a question of using these types.

该框架已包括编辑字符串，数字，枚举控件，日期/有日历和复选框（3州布尔时间，如果是空），所以创造的基本形式，只是使用这些类型的问题。

Formerly,a sub-select or view could not be optimized very well if it appearedwithin the nullable side of an outer join and contained non-strictexpressions in its result list.

以前，如果外连接可接受空值的那一边是子查询或者视图，并且返回列表里包含不严格的表达式，总是优化的不太好。

Formerly, a sub-select or view could not be optimized very well if it appeared within the nullable side of an outer join and contained non-strict expressions in its result list.

以前，如果外连接可接受空值的那一边是子查询或者视图，并且返回列表里包含不严格的表达式，总是优化的不太好。

The detailed description of the object is not important here, but we must know that the object has the following properties: AddressID, Address1, StateID, and CountryID Nullable(of Integer, and the object can load an Address record from a database with the AddressID.

该对象的详细说明在这里并不重要，但我们必须知道该对象具有以下属性：AddressID，地址，StateID和CountryID，和对象可以加载与AddressID数据库的地址记录。

Fostering the concept of multi-culture firmly and mastering the development of advanced culture correctly are conductive to resisting terrorism, separatism of nationalities and ultraism of religion, which is of great academic theoretical, immediate and profound historical si...

牢固树立多元文化的理念和正确把握先进文化的发展方向，有助于在世界范围内自觉地抵制恐怖主义，民族分裂主义和宗教极端主义。不仅具有重大的学术理论意义，而且也具有重大的现实意义和深远的历史意义。

But if anyone walks in the night, he stumbles, because the light is not in him.

11：10 若在黑夜行走，就必碰跌，因为那光不在他里面。