dataAdapter与dataSet和dataTable的填充

对于dataAdapter与dataSet和dataTable的填充，可以分为1对1,1对n，n对n，3种情况。

以SqlDataAdapter为例。

//（1）1对1  
SqlDataAdapter da=new SqlDataAdapter("SqlString",SqlConnection);  
da.fill(dataset,"tableName");  
//（2）1对n  
SqlDataAdapter da=new SqlDataAdapter("SqlString1",SqlConnection);  
da.fill(dataset1,"tableName1");  
//这里重新填充sql语句，填充对象可以使多个dataSet和dataTable。  
da=new SqlDataAdapter("SqlString2",SqlConnection);  
da.fill(dataset2,"tableName2");  
//其他的情况类似，可以依次类推到第n张表或数据集。  
//（3）n对n  
SqlDataAdapter da1=new SqlDataAdapter("SqlString1",SqlConnection);  
da1.fill(dataset1,"tableName1");  
//这里重新填充sql语句，填充对象可以使多个dataSet和dataTable。  
SqlDataAdapter da2=new SqlDataAdapter("SqlString2",SqlConnection);  
da2.fill(dataset2,"tableName2");  

　　

//数据库查询    DataSet 添加多张DateTable
SqlDataAdapter custAdapter = new SqlDataAdapter(
  "SELECT * FROM dbo.Customers", customerConnection);
OleDbDataAdapter ordAdapter = new OleDbDataAdapter(
  "SELECT * FROM Orders", orderConnection);

DataSet customerOrders = new DataSet();

custAdapter.Fill(customerOrders, "Customers");
ordAdapter.Fill(customerOrders, "Orders");


//--以下为应用
DataRelation relation = customerOrders.Relations.Add("CustOrders",
  customerOrders.Tables["Customers"].Columns["CustomerID"],
  customerOrders.Tables["Orders"].Columns["CustomerID"]);

foreach (DataRow pRow in customerOrders.Tables["Customers"].Rows)
{
  Console.WriteLine(pRow["CustomerID"]);
   foreach (DataRow cRow in pRow.GetChildRows(relation))
    Console.WriteLine("	" + cRow["OrderID"]);
}
//---------------------------

　　

参考：

1.  lllljz的专栏    dataAdapter与dataSet和dataTable的填充

2. https://msdn.microsoft.com/zh-cn/library/bh8kx08z.aspx