dataAdapter与dataSet和dataTable的填充

//（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("\t" + cRow["OrderID"]);
}
//---------------------------