CheckDefaultSyntax Method
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 CheckDefaultSyntax method allows an application to validate the syntax of a Transact-SQL database default prior to creating it.
语法
object
.CheckDefaultSyntax(
Default
)
Parts
- object
Expression that evaluates to an object in the Applies To list.
- Default
A Default object
Prototype (C/C++)
HRESULT CheckDefaultSyntax(LPSQLDMODEFAULT Default);
备注
Database defaults and rules cannot be modified once they are created. They must first be dropped and then recreated. An application can call the CheckDefaultSyntax or CheckRuleSyntax method to validate the syntax of a Transact-SQL database rule prior to its creation.
An application might call the CheckDefaultSyntax or CheckRuleSyntax in a scenario in which a rule or default already exists, and it is necessary to change the definition (specified by the Text property). The application:
- Creates a new rule or default object.
- Sets the Name property of the new object to the name of the existing object.
- Sets the Text property of the new object to define the default or rule.
- Calls CheckDefaultSyntax or CheckRuleSyntax to verify the syntax of the Text property.
- Drops the existing object and recreates it using the new object if CheckDefaultSyntax or CheckRuleSyntax returns TRUE.
- CheckDefaultSyntax returns TRUE if the Transact-SQL syntax is valid.