ASP.NET C＃-插入复合键

Question

我正在尝试在“编辑帐户”页面上执行更新和插入命令，以便用户可以编辑其信息。 用户登录后，他们将被重定向到“我的帐户”页面，该页面将显示其所有信息。

我的编辑帐户页面如下所示：

修改帐户页面图片

编辑帐户页面将访问数据/将数据插入3个表中：

1. 会员
   

   创建表[dbo]。[成员]
   （[[MemberID] INT IDENTITY（1、1）非空，
   [MemberName] VARCHAR（30）NOT NULL，
   [Phone] BIGINT NOT NULL，
   [电子邮件] VARCHAR（50）非空，
   [用户名] VARCHAR（50）非空，
   [密码] NCHAR（30）非空，
   聚集的主键（[MemberID] ASC））;

2. 地址
   

   创建表[dbo]。[地址]
   （[AddressID] INT IDENTITY（1、1）非空，
   [HouseNumber] VARCHAR（10）NOT NULL，
   [AddressLine1] VARCHAR（30）NOT NULL，
   [AddressLine2] NCHAR（30）NOT NULL，
   [城市] NCHAR（20）非空，
   [PostCode] NCHAR（7）NOT NULL，
   [AddressType] NVARCHAR（MAX）NOT NULL，
   主键群集（[AddressID] ASC））;

3. 地址_会员

   创建表[dbo]。[Address_Member]
   （[MemberID] INT NOT NULL，
   [AddressID] INT NOT NULL，
   聚集了主键（[成员ID] ASC，[地址ID] ASC），
   CONSTRAINT [FK_Address_Member_Address] FOREIGN KEY（[AddressID]）参考[dbo]。[Address]（[AddressID]），CONSTRAINT [FK_Address_Member_Member] FOREIGN KEY（[MemberID]）参考[dbo]。[Member]（[MemberID]））） ;

以下是editaccount.aspx.cs中的代码：

public partial class EditAccount : System.Web.UI.Page
{
    public SqlConnection conn = new SqlConnection("Data Source=(LocalDB)\\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\\Database.mdf;Integrated Security=True");

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            SqlCommand com;
            string str;

            conn.Open();
            str = "SELECT Address.HouseNumber, Address.AddressLine1, Address.AddressLine2, Address.City, Address.PostCode, Address.AddressType, Address_Member.MemberID, Address_Member.AddressID, Member.MemberName, Member.Phone, Member.Email, Member.Username FROM Address INNER JOIN Address_Member ON Address.AddressID = Address_Member.AddressID RIGHT JOIN Member ON Address_Member.MemberID = Member.MemberID WHERE Member.Email = '" + Session["Email"] + "'";
            com = new SqlCommand(str, conn);
            SqlDataReader reader = com.ExecuteReader();

            if (reader.Read())
            {

                TxtEName.Text = reader["MemberName"].ToString();
                LblEUser.Text = reader["Username"].ToString();
                TxtEEmail.Text = reader["Email"].ToString();
                TxtEPhone.Text = reader["Phone"].ToString();
                TxtEType.Text = reader["AddressType"].ToString();
                TxtEHouse.Text = reader["HouseNumber"].ToString();
                TxtEA1.Text = reader["AddressLine1"].ToString();
                TxtEA2.Text = reader["AddressLine2"].ToString();
                TxtECity.Text = reader["City"].ToString();
                TxtEPostcode.Text = reader["PostCode"].ToString();

                reader.Close();
                conn.Close();
            }
        }

    }

    protected void BtnSave_Click(object sender, EventArgs e)
    {
        SqlDataAdapter adapter;

        DataTable dt = new DataTable();
        DataTable dadt = new DataTable();
        DataTable da = new DataTable();



        try
        {
            conn.Open();
            string query = "SELECT Address.HouseNumber, Address.AddressLine1, Address.AddressLine2, Address.City, Address.PostCode, Address.AddressType, Address_Member.MemberID, Address_Member.AddressID, Member.MemberName, Member.Phone, Member.Email, Member.Username FROM Address INNER JOIN Address_Member ON Address.AddressID = Address_Member.AddressID INNER JOIN Member ON Address_Member.MemberID = Member.MemberID WHERE Member.Email = '" + Session["Email"] + "'";
            SqlCommand cmd = new SqlCommand(query, conn);

            adapter = new SqlDataAdapter(cmd);
            adapter.Fill(dt);
            adapter.Fill(dadt);
            adapter.Fill(da);



            if (dt.Rows.Count > 0)
            {
                string membercmd = "UPDATE Member SET MemberName=@MemberName,Email=@Email,Phone=@Phone";
                SqlCommand Member = new SqlCommand(membercmd, conn);

                Member.Parameters.AddWithValue("@MemberName", TxtEName.Text);
                Member.Parameters.AddWithValue("@Email", TxtEEmail.Text);
                Member.Parameters.AddWithValue("@Phone", TxtEPhone.Text);
                Member.ExecuteNonQuery();

            }

            if (da.Rows.Count > 0)
            {
                string Addresscmd = "UPDATE Address SET HouseNumber ='" + TxtEHouse.Text + "', AddressLine1 = '" + TxtEA1.Text + "', AddressLine2 = '" + TxtEA2.Text + "', City = '" + TxtECity.Text + "',PostCode = '" + TxtEPostcode.Text + "', AddressType = '" + TxtEType.Text + "'";
                SqlCommand Address = new SqlCommand(Addresscmd, conn);
                Address.ExecuteNonQuery();

            }
            else
            {

                string AddressInsert = "INSERT INTO Address (HouseNumber, AddressLine1, AddressLine2, City, Postcode, AddressType) VALUES (@HouseNumber, @AddressLine1, @AddressLine2, @City, @Postcode, @AddressType)";
                SqlCommand Address1 = new SqlCommand(AddressInsert, conn);
                Address1.Parameters.AddWithValue("@HouseNumber", TxtEHouse.Text);
                Address1.Parameters.AddWithValue("@AddressLine1", TxtEA1.Text);
                Address1.Parameters.AddWithValue("@AddressLine2", TxtEA2.Text);
                Address1.Parameters.AddWithValue("@City", TxtECity.Text);
                Address1.Parameters.AddWithValue("@Postcode", TxtEPostcode.Text);
                Address1.Parameters.AddWithValue("@AddressType", TxtEType.Text);
                Address1.ExecuteNonQuery();

                string AddressMember = "INSERT INTO Address_Member (AddressID,MemberID) VALUES (@AddressID,@MemberID)";
                SqlCommand Address_Member = new SqlCommand(AddressMember, conn);
                Address_Member.ExecuteNonQuery();
            }


                conn.Close();
                Response.Write("<script>alert('Changes saved')</script>");
                Response.Redirect("~/MyAccount.aspx");


        }



        catch (Exception ex)
        {
            Response.Write("<script>alert('Changes not saved')</script>" + ex);
            conn.Close();
        }

    }
}

当我执行插入命令时，会插入新数据，但是我不知道如何将ID插入到Address_Member表中，信息在表中彼此链接，最终显示在我的帐户页面上。

我也收到此错误：System.Data.SqlClient.SqlException（0x80131904）：必须声明标量变量“ @AddressID”

Answer 1

由于未将@AddressID指定为Address_Member的参数，因此会出现错误。

如果将名为@AddressID的参数添加到Address_Member并为其提供有效的值，则该错误应得到解决。

Answer 2

string AddressInsert = "INSERT INTO Address (HouseNumber, AddressLine1, AddressLine2, City, Postcode, AddressType) VALUES (@HouseNumber, @AddressLine1, @AddressLine2, @City, @Postcode, @AddressType)";
SqlCommand Address1 = new SqlCommand(AddressInsert, conn);
Address1.Parameters.AddWithValue("@HouseNumber", TxtEHouse.Text);
Address1.Parameters.AddWithValue("@AddressLine1", TxtEA1.Text);
Address1.Parameters.AddWithValue("@AddressLine2", TxtEA2.Text);
Address1.Parameters.AddWithValue("@City", TxtECity.Text);
Address1.Parameters.AddWithValue("@Postcode", TxtEPostcode.Text);
Address1.Parameters.AddWithValue("@AddressType", TxtEType.Text);
Address1.ExecuteNonQuery();

string AddressMember = "INSERT INTO Address_Member (AddressID,MemberID) VALUES (@AddressID,@MemberID)";
SqlCommand Address_Member = new SqlCommand(AddressMember, conn);
Address_Member.ExecuteNonQuery();

改成

string AddressInsert = @"
    INSERT INTO Address (HouseNumber, AddressLine1, AddressLine2, City, Postcode, AddressType) 
    VALUES (@HouseNumber, @AddressLine1, @AddressLine2, @City, @Postcode, @AddressType);

    declare @AddressID numeric(38,0)= (select SCOPE_IDENTITY()); -- if your column type is different , deal SCOPE_IDENTITY type should be same with your column

    INSERT INTO Address_Member (AddressID,MemberID) VALUES (
    @AddressID,@MemberID )
";
SqlCommand Address1 = new SqlCommand(AddressInsert, conn);
//new (get MemberID)
Address1.Parameters.AddWithValue("@MemberID", dt.Select().SingleOrDefault()["MemberID"]);
//old
Address1.Parameters.AddWithValue("@HouseNumber", TxtEHouse.Text);
Address1.Parameters.AddWithValue("@AddressLine1", TxtEA1.Text);
Address1.Parameters.AddWithValue("@AddressLine2", TxtEA2.Text);
Address1.Parameters.AddWithValue("@City", TxtECity.Text);
Address1.Parameters.AddWithValue("@Postcode", TxtEPostcode.Text);
Address1.Parameters.AddWithValue("@AddressType", TxtEType.Text);
Address1.ExecuteNonQuery();

希望对您有所帮助:)