数据未加载到数据库中

Question

当我调试这个程序时，我通过表单添加数据，并通过下一个和上一个按钮检查数据。表单显示数据，但是当我通过服务器资源管理器打开数据库并检查数据时，数据库中没有数据。我已经多次这样做了。

注意：我尝试更改 COPY TO OUTPUT DIRECTORY 属性，但没有帮助。我也已经在表格中添加了一些数据。

 public partial class Form1 : Form
    {
        DatabaseConnection objConnect;
        string conString;

        DataSet ds;
        DataRow dRow;

        int MaxRows;
        int inc = 0;

        public Form1()
        {
            InitializeComponent();
        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            try
            {
                objConnect = new DatabaseConnection();
                conString = Properties.Settings.Default.Employees1ConnectionString;

                objConnect.Connection_string = conString;
                objConnect.Sql = Properties.Settings.Default.SQL;

                ds = objConnect.Getconnection;
                MaxRows = ds.Tables[0].Rows.Count;

                NavigateRecords();

            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message,"Error");
            }   
        }

        private void NavigateRecords()
        {
            dRow = ds.Tables[0].Rows[inc];
            txtFirstname.Text = dRow.ItemArray.GetValue(1).ToString();
            txtSurname.Text = dRow.ItemArray.GetValue(2).ToString();
            txtJobtitle.Text = dRow.ItemArray.GetValue(3).ToString();
            txtDepartment.Text = dRow.ItemArray.GetValue(4).ToString();
        }

        private void btnNext_Click(object sender, EventArgs e)
        {
            if (inc != MaxRows - 1)
            {
                inc++;
                NavigateRecords();
            }
            else
            {
                MessageBox.Show("No more rows!");
            }
        }

        private void btnPrevious_Click(object sender, EventArgs e)
        {
            if (inc > 0)
            {
                inc--;
                NavigateRecords();
            }
            else 
            {
                MessageBox.Show("First Record!");
            }
        }

        private void btnaddnew_Click(object sender, EventArgs e)
        {
            txtFirstname.Clear();
            txtSurname.Clear();
            txtJobtitle.Clear();
            txtDepartment.Clear();
            btnaddnew.Enabled = false;
            btnsave.Enabled = true;
            btnCancel.Enabled = true;
        }

        private void btnsave_Click(object sender, EventArgs e)
        {
            DataRow row = ds.Tables[0].NewRow();
            row[1] = txtFirstname.Text;
            row[2] = txtSurname.Text;
            row[3] = txtJobtitle.Text;
            row[4] = txtDepartment.Text;

            ds.Tables[0].Rows.Add(row);

            try
            {
                objConnect.Updatedatabase(ds);

                MaxRows = MaxRows + 1;
                inc = MaxRows - 1;

                MessageBox.Show("Database has been updated");
            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message);
            }

            btnaddnew.Enabled = true;
            btnsave.Enabled = false;
            btnCancel.Enabled = false;

        }

        private void btnCancel_Click(object sender, EventArgs e)
        {
            NavigateRecords();
            btnaddnew.Enabled = true;
            btnsave.Enabled = false;
            btnCancel.Enabled = false;
        }


    }` class DatabaseConnection
    {
        private string sql_string;
        private string strCon;
        SqlDataAdapter da_1;

        public string Sql 
        {
            set { sql_string = value; }
        }

        public string Connection_string
        {
            set { strCon = value; }
        }

        public DataSet Getconnection
        {
            get { return MyDataSet(); }
        }

        public DataSet MyDataSet()
        {
            SqlConnection con = new SqlConnection(strCon);

            con.Open();

            da_1 = new SqlDataAdapter(sql_string, con);

            DataSet dat_set = new DataSet();
            da_1.Fill(dat_set, "Table_Data_1");
            con.Close();

            return dat_set;
        }

        public void Updatedatabase(DataSet ds)
        {
            SqlCommandBuilder cb = new SqlCommandBuilder(da_1);
            cb.DataAdapter.Update(ds.Tables[0]);
        }


    }

Answer 1

This可能会帮助您。您需要使用 select 命令配置插入/更新/删除。