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

ASP.NET
获取字符串数组的最后一段字符
asp.net遍历目录文件夹和子目录所有文件
ASP.NET 中文显示之两种解决方法
asp.net替换和恢复html特殊字符
asp.net简化接收参数值的函数
asp.net验证一个字符串是否符合指定的正则表达式
asp.net求3位不同数字的组合数
C#(.NET)数据访问连接、查询、插入等操作的封装类
在ASP.NET2.0中通过Gmail发送邮件的代码
asp.net下配置数据源时出现: 未将对象引用设置到对象的实例。
asp.net gridview强制换行
asp.net gridview多页时的批量删除
未处理的事件"PageIndexChanging" 之解决方案
gridview调整单元格宽度的方法
aspx如果引用cs中的变量的方法
asp.net导出EXCEL的功能代码
asp.net注册Javascript的方法
Asp.Net 文件操作基类
Asp.Net+XML操作基类(修改,删除,新增,创建)
asp.net 获取指定文件夹下所有子目录及文件(树形)

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: 190 ::
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.