AllowLength Property
后续版本的 Microsoft SQL Server 将删除该功能。请避免在新的开发工作中使用该功能，并着手修改当前还在使用该功能的应用程序。
The AllowLength property exposes the ability to qualify a data type using a length parameter.
语法
object
.AllowLength
Parts
- object
An expression that evaluates to an object in the Applies To list
Data Type
Boolean
Modifiable
Read-only
Prototype (C/C++)
HRESULT GetAllowLength(LPBOOL pRetVal);
注释
AllowLength is TRUE for data types that accept a length qualification. For example, the property is TRUE for the SystemDatatype object referencing the varchar data type.