c# - UPDATE 语句中的语法错误 - C#

Question

我一直在尝试从 GRIDVIEW 将数据更新到 MSACCESS 数据库。但是在执行 ExecuteNonQuery 语句时，我收到一个错误，即 SYNTAX ERROR IN UPDATE STATEMENT。请帮助我..我的问题可能与几个人发布的问题相似..但我的代码与其他人的不同..请快速响应...在下面的代码中，这是 cmd.ExecuteNonQuery 行(); 我在哪里收到错误...请帮助我

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    OleDbConnection con = new OleDbConnection(constr);
    con.Open();    
    string name = GridView1.DataKeys[e.RowIndex].Values["SName"].ToString();
    TextBox day = (TextBox)GridView1.Rows[e.RowIndex].FindControl("TextBox1");
    string com = "update enroll set Day = '?' where SName = '?'";
    OleDbCommand cmd = new OleDbCommand(com, con);
    cmd.Parameters.AddWithValue("@Day", day.Text.ToString());
    cmd.Parameters.AddWithValue("@SName", name.ToString());
    cmd.ExecuteNonQuery();
    con.Close();
    Label3.ForeColor = Color.Green;
    Label3.Text = name + " Details Updated successfully";
    GridView1.EditIndex = -1;
}

Answer 1

改变string com = "update enroll set Day = '?' where SName = '?'";

至

string com = "update enroll set Day = ? where SName = ?";

因为您在前后都有引号，?所以它不会被视为参数