作业帮This SqlTransaction has completed; it is no longer usable.C# 报出的错误,不解,望指教
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This SqlTransaction has completed; it is no longer usable.C# 报出的错误,不解,望指教
This SqlTransaction has completed; it is no longer usable.C# 报出的错误,不解,望指教
This SqlTransaction has completed; it is no longer usable.C# 报出的错误,不解,望指教
This Transaction has completed; it is no longer usable根源分析
1 链接对象没有打开Transaction
如：XXXTransaction transaction=conn.BeginXXXTransaction();
2 在Command对象中未设置Transaction
可以在new XXXCommand（sqlStr,conn,transaction）,也可以用XXXCommand对象的引用打开
com.XXXTransaction=transaction;
3 获取在本conn连接中参入了其他conn
例如：
OleDbConnection conn = DBUtilFactory.getConnection("Access");
updateStr = sb.ToString();
updateStr = updateStr.Substring(0,updateStr.LastIndexOf(",")) + " where id=" + id;
OleDbCommand com = new OleDbCommand(updateStr,conn,ts);
com.ExecuteNonQuery();
ts.Commit();
DataTable table = accessOper.sendData(conn,tableName,id);
dt.Merge(table,false,MissingSchemaAction.Ignore);
count++;
在调用accessOper.sendData（）时,两次数据库操作的conn（链接对象）是同一个.
it is no longer usable 错了。
此SQL交易已经完成，它已不再可用