当前位置: 首页 > 图文教程 > 网络编程 > ASP.NET > Edit Method

ASP.NET
Asp.net Ajax--Calendar控件使用
让ASP.NET程序自动为URL加上超级链接
ASP.NET2.0MasterPage技巧总结
asp.net读取数据库乱码的解决完全方案
asp.net中生成缩略图并添加版权
ASP.Net用MD5和SHA1加密的几种方法
asp.net客户端回调功能的实现机制
ASP.NET2.0中控件的简单异步回调
用在JavaScript的RequestHelper
用Java发送图文并茂的HTML邮件
基于.NET平台的分层架构实战(一) 综述
基于.NET平台的分层架构实战(二)需求分析与数据库设计
基于.NET平台的分层架构实战(三)架构概要设计
基于.NET平台的分层架构实战(四)实体类的设计与实现
近期的几个ASP.NET开发经验总结和收集
ASP.NET中的状态管理
asp.net基础知识介绍
对数据访问层第一种实现(Acc+SQL)的重构
.NET初学者推荐课程 asp.net错误代码大全
在.net中如何利用数据工厂实现多数据库的操作

ASP.NET 中的 Edit Method


出处:互联网   整理: 软晨网(RuanChen.com)   发布: 2009-11-03   浏览: 68 ::
收藏到网摘: n/a


Copies the current record from an updatable Recordset object to the copy buffer for subsequent editing.
Syntax
recordset.Edit
The recordset placeholder represents an open, updatable Recordset object that contains the record you want to edit.
Remarks
Once you use the Edit method, changes made to the current record's fields are copied to the copy buffer. After you make the desired changes to the record, use the Update method to save your changes.
The current record remains current after you use Edit.
Caution If you edit a record and then perform any operation that moves to another record, but without first using Update, your changes are lost without warning. In addition, if you close recordset or end the procedure which declares the Recordset or the parent Database or Connection object, your edited record is discarded without warning.
Using Edit produces an error if:

?There is no current record.?The Connection, Database, or Recordset object was opened as read-only.?No fields in the record are updatable.?The Database or Recordset was opened for exclusive use by another user (Microsoft Jet workspace).?Another user has locked the page containing your record (Microsoft Jet workspace).
In a Microsoft Jet workspace, when the Recordset object's LockEdits property setting is True (pessimistically locked) in a multiuser environment, the record remains locked from the time Edit is used until the update is complete. If the LockEdits property setting is False (optimistically locked), the record is locked and compared with the pre-edited record just before it's updated in the database. If the record has changed since you used the Edit method, the Update operation fails with a run-time error if you use OpenRecordset without specifying dbSeeChanges. By default, Microsoft Jet-connected ODBC and installable ISAM databases always use optimistic locking.
In an ODBCDirect workspace, once you edit (and use Update to update) a record抯 primary key field, you can no longer edit fields in that record until you close the Recordset, and then retrieve the record again in a subsequent query.
Note To add, edit, or delete a record, there must be a unique index on the record in the underlying data source. If not, a "Permission denied" error will occur on the AddNew, Delete, or Edit method call in a Microsoft Jet workspace, or an "Invalid argument" error will occur on the Update call in an ODBCDirect workspace.