[英]ASP.NET C# - Insert into compound keys
我正在嘗試在“編輯帳戶”頁面上執行更新和插入命令,以便用戶可以編輯其信息。 用戶登錄后,他們將被重定向到“我的帳戶”頁面,該頁面將顯示其所有信息。
我的編輯帳戶頁面如下所示:
編輯帳戶頁面將訪問數據/將數據插入3個表中:
會員
創建表[dbo]。[成員]
([[MemberID] INT IDENTITY(1、1)非空,
[MemberName] VARCHAR(30)NOT NULL,
[Phone] BIGINT NOT NULL,
[電子郵件] VARCHAR(50)非空,
[用戶名] VARCHAR(50)非空,
[密碼] NCHAR(30)非空,
聚集的主鍵([MemberID] ASC));
地址
創建表[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,
主鍵群集([AddressID] ASC));
地址_會員
創建表[dbo]。[Address_Member]
([MemberID] INT NOT NULL,
[AddressID] INT NOT NULL,
聚集了主鍵([成員ID] ASC,[地址ID] ASC),
CONSTRAINT [FK_Address_Member_Address] FOREIGN KEY([AddressID])參考[dbo]。[Address]([AddressID]),CONSTRAINT [FK_Address_Member_Member] FOREIGN KEY([MemberID])參考[dbo]。[Member]([MemberID]))) ;
以下是editaccount.aspx.cs中的代碼:
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();
}
}
}
當我執行插入命令時,會插入新數據,但是我不知道如何將ID插入到Address_Member表中,信息在表中彼此鏈接,最終顯示在我的帳戶頁面上。
我也收到此錯誤:System.Data.SqlClient.SqlException(0x80131904):必須聲明標量變量“ @AddressID”
由於未將@AddressID指定為Address_Member的參數,因此會出現錯誤。
如果將名為@AddressID的參數添加到Address_Member並為其提供有效的值,則該錯誤應得到解決。
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();
希望對您有所幫助:)
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