訪問數據庫錯誤：“在UPDATE語句中出現語法錯誤。”在c＃中

Question

我有一個datagridview。 我從數據庫中獲取數據並在此gridview中顯示。 但是，當我嘗試通過單擊按鈕更新它時，它顯示錯誤。

            try
            {
                string update = "update Tank_Head set Item_Code='?', Opening_Bal='?', Tank_Description='?', where Tank_Unit='?' and companyID='?'";
                OleDbCommand cmd = new OleDbCommand(update, con);
                cmd.Parameters.AddWithValue("@Item_Code", cbItemEdit.Text);
                cmd.Parameters.AddWithValue("@Opening_Bal", txtOpeningBalanceEdit.Text);
                cmd.Parameters.AddWithValue("@Tank_Description", txtTankDesEdit.Text);
                cmd.Parameters.AddWithValue("@Tank_Unit", txtTankUnitEdit.Text);
                cmd.Parameters.AddWithValue("@companyID", label1.Text);
                i = cmd.ExecuteNonQuery();

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());
            }
            finally
            {
                con.Close();
                if (i != 0)
                {
                    pnlView.Visible = true;
                    pnlEdit.Visible = false;
                }
            }

Answer 1

你在那里有一個流浪逗號：

update Tank_Head set Item_Code='?', Opening_Bal='?', Tank_Description='?', <<< where Tank_Unit='?' and companyID='?'

刪除它，它應該工作正常：

update Tank_Head set Item_Code='?', Opening_Bal='?', Tank_Description='?' where Tank_Unit='?' and companyID='?'

Answer 2

在你的查詢之前有額外的,在where

像這樣替換你的查詢

string update = "update Tank_Head set Item_Code='?', Opening_Bal='?', Tank_Description='?'  where Tank_Unit='?' and companyID='?'";

Answer 3

更新最后一個字段后出現錯誤導致錯誤。 嘗試將語句更改為

string update = "update Tank_Head set Item_Code='?', Opening_Bal='?', Tank_Description='?' where Tank_Unit='?' and companyID='?'";