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

ASP.NET
asp.net neatUpload 支持大文件上传组件
ASP.net 动态加载控件时一些问题的总结
web用户控件调用.aspx页面里的方法
asp.net 继承自Page实现统一页面验证与错误处理
asp.net 文件下载实现代码
asp.net ToString()格式设置大全
.NET 水晶报表使用代码
c# NameValueCollection类读取配置信息
asp.net 不用组件的URL重写(适用于较大型项目)
.aspx中的命名空间设置实现代码
asp.net access web.config denied
JAVA正则表达式 Pattern和Matcher
asp.net 每天定点执行任务
asp.net fileupload 实现上传
asp.net slickupload 使用方法(文件上传)
asp.net 从客户端中检测到有潜在危险的 Request.Form 值错误解
关于asp.net button按钮的OnClick和OnClientClick事件
asp.net 权限管理分析
c# table 控件用法
asp.net repeater手写分页实例代码

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: 209 ::
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.