关于事务,该怎么处理
日期：2014-05-18 浏览次数：20921 次
关于事务
代码如下
以上代买该怎么修正 谢谢！
异常提示：System.Web.Services.Protocols.SoapException: 服务器无法处理请求。 ---> System.InvalidOperationException: 已有打开的与此命令相关联的 DataReader，必须首先将它关闭。
------解决方案--------------------
try{}
catch()
finally
{
关闭数据连接
}
------解决方案--------------------
代码如下
- C# code
myConnection.open()
SqlCommand myCommand = myConnection.CreateCommand();
SqlTransaction myTrans;
myTrans = myConnection.BeginTransaction(IsolationLevel.ReadCommitted);
myCommand.Connection = myConnection;
myCommand.Transaction = myTrans;
try
{
myCommand.CommandType = CommandType.StoredProcedure;
myCommand.CommandText = "A";
myCommand.ExecuteNonQuery();
myCommand.CommandType = CommandType.Text;
myCommand.CommandText = "select str from B where number='111'";
string temp = null;
SqlDataReader rd = myCommand.ExecuteReader();
if (rd.Read())
{
temp = rd.GetString(0).ToString();
}
myCommand.CommandType = CommandType.StoredProcedure;
myCommand.CommandText = "C";
SqlParameter spam1 = new SqlParameter();
spam1.ParameterName = "@code";
spam1.SqlDbType = SqlDbType.VarChar;
spam1.Size = 25;
spam1.Value = temp;
spam1.Direction = ParameterDirection.Input;
myCommand.Parameters.Add(spam1);
myCommand.ExecuteNonQuery();
myTrans.Commit();
}
cacth(Exception)
{
myTrans.Rollback();
}
以上代买该怎么修正 谢谢！
异常提示：System.Web.Services.Protocols.SoapException: 服务器无法处理请求。 ---> System.InvalidOperationException: 已有打开的与此命令相关联的 DataReader，必须首先将它关闭。
------解决方案--------------------
try{}
catch()
finally
{
关闭数据连接
}
------解决方案--------------------
- C# code
myConnection.open()
SqlCommand myCommand = myConnection.CreateCommand();
SqlTransaction myTrans;
myTrans = myConnection.BeginTransaction(IsolationLevel.ReadCommitted);
myCommand.Connection = myConnection;
myCommand.Transaction = myTrans;
try
{
myCommand.CommandType = CommandType.StoredProcedure;
myCommand.CommandText = "A";
myCommand.ExecuteNonQuery();
myCommand.CommandType = CommandType.Text;
myCommand.CommandText = "select str from B where number='111'";
string temp = null;
SqlDataReader rd = myCommand.ExecuteReader();
if (rd.Read())
{
temp = rd[0].ToString();//如果为null不会报错
temp = rd.GetString(0);//如果为null会报错
}
myCommand.CommandType = CommandType.StoredProcedure;
myCommand.CommandText = "C";
SqlParameter spam1 = new SqlParameter();
spam1.ParameterName = "@code";
spam1.SqlDbType = SqlDbType.VarChar;
spam1.Size = 25;
spam1.Value = temp;
spam1.Direction = ParameterDirection.Input;
myCommand.Parameters.Add(spam1);
myCommand.ExecuteNonQuery();
myTrans.Commit();
}
cacth(Exception)
{
myTrans.Rollback();
}finally
{
//关闭数据库
}
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