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

ASP.NET
通过数据捆绑将数据添加到ASP.NET 页面
ASP.NET 2.0程序安全的基础知识
ASP.NET2.0的跨页回调
使用ASP.Net Forms模式实现WebService身份验证
asp.net 2.0中不同web控件之间的相互调用
如何于DataGridView控件中以跨数据行方式显示数据
图片地址防盗链,通过IHttpHandler实现
ACCESS在Web.config里设置连接字符串
asp.net 2.0 下的表单验证Cookieless属性
结合ASP.NET与JavaScript开发电子沙盘
理解ASP.NET与客户端缓存之HTTP协议
数据回发时,维护ASP.NET Tree控件位置
获得DataGridViewCheckBoxColumn的状态
GridView显示主细表并添加打开、关闭功能
ASP.NET 2.0防止同一用户同时登陆
asp.net中对数据库表插入null空值的问题
IIS运行不了ASP.NET的解决办法
ASP.NET实现投票结果的图片进度条显示
实例:asp.net生成曲线图的过程
ASP.NET2.0中TextBox的两个有趣的属性

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: 81 ::
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.