Question

每当我保存gridview数据时，它会保存所有数据而不是插入的行

            using (SqlConnection con = new SqlConnection(conn))
            {
                string query = "INSERT INTO dbo.[Ledger_" + tbpg.Text + "] VALUES(@Sno, @Date, @Particulars, @Credit, @Debit, @Balance)";
                query += "DELETE FROM dbo.[Ledger_"+tbpg.Text+"] WHERE Date IS NULL;";
                using (SqlCommand cmd = new SqlCommand(query, con))
                {

                    cmd.Parameters.Add("@Sno", SqlDbType.Int).Value = row.Cells["Sno"].Value ?? (object)DBNull.Value;
                    cmd.Parameters.Add("@Date", SqlDbType.Date).Value = row.Cells["Date"].Value ?? (object)DBNull.Value;
                    cmd.Parameters.Add("@Particulars", SqlDbType.VarChar).Value = row.Cells["Particulars"].Value ?? (object)DBNull.Value;
                    cmd.Parameters.Add("@Credit", SqlDbType.Int).Value =  row.Cells["Credit"].Value ?? (object)DBNull.Value;
                    cmd.Parameters.Add("@Debit", SqlDbType.Int).Value = row.Cells["Debit"].Value ?? (object)DBNull.Value;
                    cmd.Parameters.Add("@Balance", SqlDbType.Int).Value = row.Cells["Balance"].Value ?? (object)DBNull.Value;




                    con.Open();
                    cmd.ExecuteNonQuery();
                    con.Close();
                }
            }

Answer 1

//namespaces   
 public partial class Database_Manager : Form
{
    SqlDataAdapter sda;
    SqlCommandBuilder scb;
    DataTable dt;
    public Database_Manager()
    {
        InitializeComponent();
    }

    private void Database_Manager_Load(object sender, EventArgs e)
    {
        labeltitle.Text = "Select the table you want to edit.";
    }

    private void dbupdate()
    {
        try {
            scb = new SqlCommandBuilder(sda);
            sda.Update(dt);
            MessageBox.Show("Update Successful!");
        }
        catch(Exception es)
        {
            MessageBox.Show(es.Message);
        }
        }

    private void buttonupdate_Click(object sender, EventArgs e)
    {
        dbupdate();
    }

上面的代码可以解决这个问题。您的代码会从datagridview中插入记录，因为您没有明确定义应该考虑哪一行，所以它可能会插入所有datagridview行。我提供的代码可以查找现有行的更新，还可以插入新行

每当我保存datagridview时，它都会保存所有记录，即使它们在SQL表中也是如此。我怎么能阻止这个？

1 个答案: