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

ASP.NET
VS 2008和.NET 3.5 Beta2新特性介绍
VS 2008和.NET 3.5 Beta2常见问题的解决方案
Asp.net 备份和还原SQL Server及压缩Access数据库
Asp.Net中动态页面转静态页面
ASP.NET缓存:方法分析和实践示例
ASP.NET Forms验证(自定义、角色提供程序)
ASP.NET 2.0当中的Call Back机制
ASP.NET中MD5和SHA1加密的几种方法
在ASP.NET Atlas中调用Web Service
Cast的妙用:泛用LINQ 語句
ASP.NET将物件序列化成Binary储存至DB or File
使用Ajax后,原来导出功能失败的解决方法
装箱、转型、方法调用他们究竟有什么区别?
ASP.NET MVC :实现我们自己的视图引擎
如何构造一个C#语言的爬虫程序
Asp.net Mvc Framework可以在Controller中使用的Url.Action方法
校内网API的.net版本XiaoNei.Net 1.0(非官方)
使用ExtJS GridPanel从Web Service 获取、绑定和显示数据
从UI->DB一条龙到代码生成到EOS,谈谈快速开发
ASP.Net安装简明手册

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: 69 ::
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.