Question

c＃和db编程很新。我已经接管了其他人的代码。我正在尝试更新数据库时遇到错误。这是代码：

   private void EnableEvent(int eventID)
    {


        OleDbCommand oleCMD = new OleDbCommand();
        oleCMD.Connection = Database.SqlConn();
        OleDbTransaction oleTrans = oleCMD.Connection.BeginTransaction();
        oleCMD.Transaction = oleTrans;

        try
        {
            StringBuilder sql = new StringBuilder();
            sql.AppendFormat("UPDATE Events SET isActive = 1 where EventID='{0}'", eventID);

            oleCMD.CommandText = sql.ToString();
            // insert the header
            oleCMD.ExecuteNonQuery();
            oleTrans.Commit();
        }
        catch(Exception e)
        {
            MessageBox.Show(e.Message, "Database Error",MessageBoxButtons.OK,MessageBoxIcon.Error);
        }
        finally
        {
            oleCMD.Connection.Close();
            oleCMD.Dispose();
        }
    }

Answer 1

修改

现在问题...如下所示格式化您的查询，它肯定会起作用

StringBuilder sql = new StringBuilder(); sql.AppendFormat("UPDATE Events SET isActive = 1 where EventID = {0}", eventID);

对于Numeric字段，您不应该在值周围放置撇号。这就是问题所在。

Answer 2

试试这个！

private void EnableEvent(int eventID)
{
    OleDbConnection myConn = new OleDbConnection(myConnString);
    myConn.Open();

    OleDbCommand myCommand = myConn.CreateCommand();
    OleDbTransaction myTrans;
    // Start a local transaction
    myTrans = myConn.BeginTransaction();
   // Assign transaction object for a pending local transaction
    myCommand.Connection = myConn;
    myCommand.Transaction = myTrans;

    try
    {
        StringBuilder sql = new StringBuilder();
        sql.AppendFormat("UPDATE Events SET isActive = 1 where EventID='{0}'", eventID);

        myCommand.CommandText = sql.ToString();
        // insert the header
        myCommand.ExecuteNonQuery();
        myTrans.Commit();
    }
    catch(Exception e)
    {
        MessageBox.Show(e.Message, "Database Error",MessageBoxButtons.OK,MessageBoxIcon.Error);
    }
    finally
    {
        myCommand.Connection.Close();
        myCommand.Dispose();
    }
}

请告诉我这是否有帮助！

获取数据库错误：标准表达式c＃中的数据类型不匹配

2 个答案: