共用方式為

DRIDefault Object

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未來的 Microsoft SQL Server 發行版本將不再提供此功能。請避免在新的開發工作中使用此功能，並計劃修改目前使用此功能的應用程式。

The DRIDefault object represents the properties of a Microsoft SQL Server column DEFAULT constraint.

顯示目前物件的 SQL-DMO 物件模型

Properties

Name Property

Text Property

Methods

Remove Method (Objects)

Script Method

備註

The SQL Server column DEFAULT constraint is used to generate data for the column when none is supplied by the user on INSERT statement execution. With the DRIDefault object, you can:

  • Set the DEFAULT constraint for a SQL Server column.
  • Remove the DEFAULT constraint from a SQL Server column.

The Name property of the DRIDefault object uses the SQL Server data type sysname. Name is optional when using the object to create a DEFAULT constraint for a SQL Server column. If Name is not specified, SQL Distributed Management Objects (SQL-DMO) generates an appropriate value.

When setting the Text property of a DRIDefault object, specify only the text for the default. You do not need to build the constraint clause because SQL-DMO does that. The Text property value must evaluate to a constant. For more information about limitations on the Text property, see the description of the DEFAULT constraint in CREATE TABLE (Transact-SQL).

Delimiters that specify constant strings must be present in the Text property value when specifying string data as part of the property. For example, to specify the string "unknown" as the default, use 'unknown'.

To set a DEFAULT constraint on a new SQL Server column

  1. Create a Table object.

  2. Create a Column object.

  3. Get the DRIDefault object from the new Column object.

  4. Set the Text property of the DRIDefault object to the default for the column.

  5. Add the Column object to the Columns collection of the new Table object.

  6. Add the Table object to the Tables collection of a connected Database object.

To set a DEFAULT constraint on an existing SQL Server column

  1. Get a Table object from the Tables collection of a connected Database object.

  2. Use the BeginAlter method of the Table object to mark the beginning of changes to the SQL Server table.

  3. Get the Column object you want from the Columns collection of the selected Table object.

  4. Get the DRIDefault object from the new Column object.

  5. Set the Text property of the DRIDefault object to the default for the column.

  6. Use the DoAlter method of the Table object to submit changes to the instance of SQL Server.

請參閱

參考

Column Object
Table Object

說明及資訊

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