c# - 尝试从数据库 GridView 特定用户进行更新 (OleDbCommand)

Question

大家好，我正在处理用户 GridView 数据库更新，我的更新行有问题，它告诉我当我点击更新时，该行更新成功但它并没有真正更新它:(

代码:

1 ASP.net(OleDB)

 protected void AdminBook_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    try
    {
        using (OleDbConnection sqlCon = new OleDbConnection(connectionStr))
        {
            sqlCon.Open();
            string query = "UPDATE Users SET FirstName=@FirstName,LastName=@LastName,UserPass=@UserPass,Gender=@Gender,Birthday=@Birthday,Email=@Email WHERE UserID=@id";
            OleDbCommand sqlCmd = new OleDbCommand(query, sqlCon);
            sqlCmd.Parameters.AddWithValue("@FirstName", (AdminBook.Rows[e.RowIndex].FindControl("txtFirstName") as TextBox).Text.Trim());
            sqlCmd.Parameters.AddWithValue("@LastName", (AdminBook.Rows[e.RowIndex].FindControl("txtLastName") as TextBox).Text.Trim());
            sqlCmd.Parameters.AddWithValue("@UserPass", (AdminBook.Rows[e.RowIndex].FindControl("txtUserPass") as TextBox).Text.Trim());
            sqlCmd.Parameters.AddWithValue("@Gender", (AdminBook.Rows[e.RowIndex].FindControl("txtGender") as TextBox).Text.Trim());
            sqlCmd.Parameters.AddWithValue("@Birthday", (AdminBook.Rows[e.RowIndex].FindControl("txtBirthday") as TextBox).Text.Trim());
            sqlCmd.Parameters.AddWithValue("@Email", (AdminBook.Rows[e.RowIndex].FindControl("txtEmail") as TextBox).Text.Trim());
            sqlCmd.Parameters.AddWithValue("@UserName", (AdminBook.Rows[e.RowIndex].FindControl("txtUserName") as TextBox).Text.Trim());
            sqlCmd.Parameters.AddWithValue("@id", Convert.ToInt32(AdminBook.DataKeys[e.RowIndex].Value.ToString()));
            sqlCmd.ExecuteNonQuery();
            AdminBook.EditIndex = -1;
            PopulateGridView();
            lblSuccessMessage.Text = "עריכת הנתונים התבצעה בהצלחה";
            lblErrorMessage.Text = "";
        }
    }
    catch (Exception ex)
    {
        lblSuccessMessage.Text = "";
        lblErrorMessage.Text = ex.Message;
    }
}

2 HTML(非常短)

    <asp:GridView ID="AdminBook" runat="server" AutoGenerateColumns="False" 
      ShowFooter="True" DataKeyNames="UserID"
            ShowHeaderWhenEmpty="True"

            OnRowCommand="AdminBook_RowCommand" OnRowEditing="AdminBook_RowEditing" OnRowCancelingEdit="AdminBook_RowCancelingEdit"
            OnRowUpdating="AdminBook_RowUpdating" OnRowDeleting="AdminBook_RowDeleting"

            BackColor="White" BorderColor="#999999" BorderStyle="Solid" 
      BorderWidth="1px" CellPadding="3" ForeColor="Black" GridLines="Vertical">

你能看到的图片: Here you can see that it show the success message

请帮助我...因为它使它成功但没有真正在数据库中更新 :(

Answer 1

您查询的主要问题是此参数定义的存在:

sqlCmd.Parameters.AddWithValue("@UserName", (AdminBook.Rows[e.RowIndex].FindControl("txtUserName") as TextBox).Text.Trim());

查询字符串中不存在，它有 7 个参数，而不是 cmd.Parameters.Add() 定义的 8 个参数:

UPDATE Users SET FirstName=@FirstName,LastName=@LastName,UserPass=@UserPass,Gender=@Gender,Birthday=@Birthday,Email=@Email WHERE UserID=@id

注意 OLE DB 不识别命名参数，它只识别 positional parameters (查询参数按其定义顺序处理)。对于代码中的当前顺序，UserName 参数可能被错误地分配为 id，并且由于提供的值与存储在 UserID 中的任何值都不匹配列，则不会更新任何数据。

因此，您应该删除上面提到的行，以便查询参数与它们在查询字符串中的顺序完全匹配:

string query = "UPDATE Users SET FirstName=@FirstName,LastName=@LastName,UserPass=@UserPass,Gender=@Gender,Birthday=@Birthday,Email=@Email WHERE UserID=@id";

OleDbCommand sqlCmd = new OleDbCommand(query, sqlCon);

sqlCmd.Parameters.AddWithValue("@FirstName", (AdminBook.Rows[e.RowIndex].FindControl("txtFirstName") as TextBox).Text.Trim());
sqlCmd.Parameters.AddWithValue("@LastName", (AdminBook.Rows[e.RowIndex].FindControl("txtLastName") as TextBox).Text.Trim());
sqlCmd.Parameters.AddWithValue("@UserPass", (AdminBook.Rows[e.RowIndex].FindControl("txtUserPass") as TextBox).Text.Trim());
sqlCmd.Parameters.AddWithValue("@Gender", (AdminBook.Rows[e.RowIndex].FindControl("txtGender") as TextBox).Text.Trim());
sqlCmd.Parameters.AddWithValue("@Birthday", (AdminBook.Rows[e.RowIndex].FindControl("txtBirthday") as TextBox).Text.Trim());
sqlCmd.Parameters.AddWithValue("@Email", (AdminBook.Rows[e.RowIndex].FindControl("txtEmail") as TextBox).Text.Trim());
sqlCmd.Parameters.AddWithValue("@id", Convert.ToInt32(AdminBook.DataKeys[e.RowIndex].Value.ToString()));

或者在WHERE 子句之前添加UserName 列而不改变参数顺序:

string query = "UPDATE Users SET FirstName=@FirstName,LastName=@LastName,UserPass=@UserPass,Gender=@Gender,Birthday=@Birthday,Email=@Email,
                UserName=@UserName WHERE UserID=@id";