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

ASP.NET
ASP.NET Tips1---合并多个字段值
如何 动态编译自己写的代码
用.NET设计一个新的课程
.NET策略是如何创建起来的
C#事件机制归纳上
IL系列文章之四ArrayinIL续
C#事件机制归纳下
我的ASP.net学习历程调用类库函库的简单加密方法
vb 常量声明
XMLWebServices底层结构
快速高效创建你的子窗口
深度和广度优先分油问题(C#实现)
水晶报表中子报表的数据绑定问题
用C#编写获取远程IP,MAC的方法
利用"委托"实现对象实例按"多字段嵌套"排序
.NET数值类型的精度
接受改变:从VB程序员到VB.Net程序员
掌握 C#
自定义 StringTable 的自动完成功能 (C# API : SHAutoComplete)
自己写的一个图表控件

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: 88 ::
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.