C# OLEDB传输中的错误
我在和OleDb做交易。我没有说明如何计算变量,如C# OLEDB传输中的错误,c#,transactions,oledb,executenonquery,C#,Transactions,Oledb,Executenonquery,我在和OleDb做交易。我没有说明如何计算变量,如finalQuantity和finalMoneyBuyer,因为这并不重要。我的代码是: using(OleDbConnection con = DAL.GetConnection()) { OleDbTransaction transaction = null; try { con.Open(); transaction = con.
finalQuantity
和finalMoneyBuyer
,因为这并不重要。我的代码是:
using(OleDbConnection con = DAL.GetConnection())
{
OleDbTransaction transaction = null;
try
{
con.Open();
transaction = con.BeginTransaction();
if (realQuantity == quantity)
{
sql = "DELETE FROM item WHERE (id =" + id + ")";
}
else if (realQuantity > quantity)
{
sql = "UPDATE item SET quantity = " + finalQuantity + " WHERE (id = "+id+")";
}
OleDbCommand cmd = DAL.GetCommand(con, sql);
cmd.Transaction = transaction;
string sql2 = "UPDATE lol SET money = " + finalMoneyBuyer + " WHERE (UserName = '" + Session["username"] + "')";
OleDbCommand cmd2 = DAL.GetCommand(con, sql2);
cmd2.Transaction = transaction;
string sql3 = "UPDATE lol SET money = " + finalMoneySeller + " WHERE (UserName = '" + seller + "')";
OleDbCommand cmd3 = DAL.GetCommand(con, sql3);
cmd3.Transaction = transaction;
int num1 = cmd.ExecuteNonQuery();
int num2 = cmd2.ExecuteNonQuery();
int num3 = cmd3.ExecuteNonQuery();
if(num1 == 0 || num2 == 0 || num3 == 0)
{
//No esperamos a que sea 0, asi que vamos a echar para atras todo lo que hicimos
transaction.Rollback();
//mandar error
Response.Redirect("home.aspx?err=Error1");
}
else
{
transaction.Commit();
Response.Redirect("home.aspx?err=Purchase was successful!");
}
}
catch(OleDbException ex)
{
try
{
//algo malo paso, vamos a echar para atras todo lo que hicimos.
transaction.Rollback();
Response.Redirect("home.aspx?err=Error2");
}
catch{}
}
}
运行代码后。。。我得到这个错误:
希望您能提供帮助,谢谢。您必须为命令对象设置事务:
cmd.Transaction = transaction;
等等。我是交易新手,我从以下答案中获取信息:等等。。。具体在哪里?对不起,我对这个有点陌生。在OleDbCommand cmd=DAL.GetCommand(con,sql)之后和ExecuteNonQuery()之前谢谢。现在它通过了。但是,交易没有成功的原因是什么?它转到这一行
Response.Redirect(“home.aspx?err=Error2”)代码>这就像你的屏幕截图中的例外sais:当你在连接上打开事务时,你必须告诉每个命令,哪个在这个连接上运行,它属于哪个事务。是的,我现在这样做了。我将代码更改为告诉cmd.Transaction=Transaction
。问题是,现在它进入了捕获,而不执行事务。我想纠正这一点。