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

ASP.NET
.NET可复用TCP通信层之消息分派器组件
Asp.Net结合JS在图层上显示记录信息
.NET 2.0里使用强类型数据创建多层应用
ADO.NET Entity Framework 试水——并发
.Net开发:ADO.NET实用技巧两则
使用LINQ来简化编程的7个技巧
VC.NET扩展Windows磁盘清理工具的功能
Asp.Net页面执行流程分析
用asp.net程序备份或还原SQLServer
ASP.NET实现页面间值传递的几种方法介绍
技巧实例:如何在.NET中访问MySQL数据库
asp.net中数据校验部分的封装与应用
ASP.NET中前台javascript与后台代码调用
翻译 一些很酷的.Net技巧
ASP.NET常用的26个优化性能方法
了解VB.NET中的常量与枚举功能
.NET FileStreams将DTD插入XML文件中
Windows CE.Net下矩阵键盘开发设计详解
.Net编程接口剖析系列之比较和排序
在.NET中字符串替换的五种方法

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: 183 ::
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.