數據未加載到數據庫中

Question

當我調試此程序時，我通過表單添加數據，並通過下一個和上一個按鈕檢查數據。表單顯示數據，但是當我通過服務器瀏覽器打開數據庫並檢查數據時，數據庫中沒有數據。我已經多次這樣做了。

注意：我試過更改COPY TO OUTPUT DIRECTORY屬性，但它沒有幫助。我也已經在表格中添加了一些數據。

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可能會幫助你。您需要使用select命令配置插入/更新/刪除。