總和並顯示在datagridview的數據庫值

Question

我想在使用組datagridview總結和展示價值通過

string connStr = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\Restaurant.accdb;Persist Security Info=False;"; 
string query = "SELECT Column2,SUM(Column1),Receipt No,Date From Total Group By[Column2]"; 
//SELECT Column2 FROM Total GROUP BY [Column2] 
using (OleDbConnection conn = new OleDbConnection(connStr)) 
{ 
    using (OleDbDataAdapter adapter = new OleDbDataAdapter(query, conn)) 
    { 
     DataSet ds = new DataSet(); 
     if (ds != null) 
     { 
      adapter.Fill(ds); 

      dataGridView1.DataSource = ds.Tables[0]; 

當這種形式加載它的自動關閉沒有顯示任何datagrdview

Answer 1

月1日修正您的查詢：

string query = "SELECT Column2,SUM(Column1),[Receipt No],Date From Total Group By [Column2],[Receipt No],Date"; 

和2打開連接：

using (OleDbConnection conn = new OleDbConnection(connStr)) 
      { 
       using (OleDbDataAdapter adapter = new OleDbDataAdapter(query, conn)) 
       { 
        conn.Open(); 
        ... 

編輯： 你的第二查詢應該是：

"SELECT Column3 As [Table No],SUM(Column1) As Price,[Receipt No],Date From Total Where [Receipt No] = '" + textBox1.Text + "' Group By [Column3],[Receipt No],[Date]"; 

Answer 2

請檢查conn.Open（）;似乎失蹤了。

using (OleDbDataAdapter adapter = new OleDbDataAdapter(query, conn)) 
{ 
    conn.Open(); 
    DataSet ds = new DataSet(); 
    if (ds != null) 
    { 
      adapter.Fill(ds); 

      dataGridView1.DataSource = ds.Tables[0]; 
    ...... 

希望這會有所幫助！