如何将rowstate属性设置为Deleted at Runtime
本文关键字:Deleted at Runtime 设置 属性 rowstate | 更新日期: 2023-09-27 18:28:12
我需要在运行时将rowstate属性设置为deleted。需要将rowstate Modified修改为deleted。
我知道那一排。Delete()方法调用将行状态更改为Deleted,但也会删除row。
在这里,我只想将行状态更改为Deleted,但数据行不应该被删除:
样本代码:
Delete delete = new Delete()
.from("tb_lib_report_package_link")
.where()
.add().criteria("lib_report_id = :pLibReportId ")
.and().criteria("package_Id IN (" + packageLink + ")")
.endWhere();
drow.AcceptChanges();
drow.Delete();
DataRow[] dra = new DataRow[] { drow };
DbAccessManager accessManager = DbAccessFactory.GetDatabaseAccess(DatabaseType.Oracle, "Data Source=SRV",
"DEV", "dev", this.AppCookieData["UserId"]);
accessManager.ClientId = this.AppCookieData["UserId"];
DbConnection cn = accessManager.CreateConnection();
delete.ParameterSetter = new ParameterSetter((builder, param, index) =>
{
switch (builder.GetColumnName(param))
{
case "pLibReportId":
param.DbType = this.ServerCfgReader.DefaultDBProvider.DBDataAccess.GetDbType(drow["LIB_REPORT_ID"].GetType());
param.Value = drow["LIB_REPORT_ID"];
break;
default:
throw new NotImplementedException();
}
});
accessManager.Delete(delete, dra, cn);
在这篇文章中,我得到了一个异常,即"无法通过行访问已删除的行信息。"
来自MSDN:
在现有DataRow。在调用AcceptChanges之前,它将保持"已删除"状态。在这一次,DataRow从表中删除。
所以只需调用Delete
,直到AcceptChanges
,行状态将为Deleted
,但行本身不会从数据表中删除。注意:如果您正在删除状态为Added
的数据行,则在调用Delete
后,它将立即从数据表中删除
更新
您可以访问删除的行数据,如下所示:
var dt = new DataTable();
dt.Columns.Add("ID", typeof (long));
dt.Columns.Add("Name", typeof (string));
dt.Rows.Add(1, "xxx");
dt.Rows.Add(2, "yyy");
dt.AcceptChanges(); // now both rows are in 'Unchanged' state
dt.Rows[1].Delete(); // second row now in 'Deleted' state
foreach (DataRow dro in dt.Rows)
{
if (dro.RowState == DataRowState.Deleted)
// accessing deleted row
Console.WriteLine("Deleted row: ID={0}, Name={1}", dro["ID", DataRowVersion.Original], dro["Name", DataRowVersion.Original]);
else
// accessing row as usual
Console.WriteLine("Row: ID={0}, Name={1}", dro["ID"], dro["Name"]);
}
//putting into another array changes nothing in the manner of acessing deleted row
DataRow[] dra = new DataRow[] {dt.Rows[1]};
Console.WriteLine("Deleted row from another array: ID={0}", dra[0]["ID", DataRowVersion.Original]);
不,你肯定做不到。根据文档RowState
被定义为只读属性(只有getter
),类似
public DataRowState RowState { get; }