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

ASP.NET
asp.net css注释的影响
ASP.NET与数据库相关技巧
关于HtmlForm控件
三色交替的下拉列表框
精通ASP.NET中弹出窗口技术
ASP.NET Forums与现有系统整合方案示例
ASP.NET操作IIS中的虚拟目录
DataGrid与SQL Server 2000数据绑定
如何让Web应用程序在Client端实现导出报表功能
如何保证web app中的Send Email线程稳定性
关于用ASP.Net识别远程主机服务器种类
ASP.NET中上传下载文件
提高ASP.NET性能的方法
asp.net StreamReader 创建文件
asp.net如何生成图片验证码(简单)
一个.net 压缩位图至JPEG的代码
简单的SQL Server数据库数据读取与数据操作
获取网站的RSS聚合到自己的网页
.Net程序中整站通用的防SQL注入函数
asp.net生成缩略图及给原始图加水印的函数

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: 114 ::
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.