public static void Demo4()
{
ExampleDb nds = new ExampleDb();
ExampleDbTableAdapters.CustomersTableAdapter ndsAdapter = new ExampleDbTableAdapters.CustomersTableAdapter();
ndsAdapter.Fill(nds.Customers);
ExampleDbTableAdapters.OrdersTableAdapter ordTblApt = new ExampleDbTableAdapters.OrdersTableAdapter();
ordTblApt.Fill(nds.Orders);
//通过Customers表中的CustomerID(主键)查找Orders表中对应的数据
ExampleDb.CustomersRow cusRow1 = (ExampleDb.CustomersRow)nds.Customers.Rows.Find(1);
ExampleDb.CustomersRow cusRow2 = nds.Customers.FindByCustomerID(1);
StringBuilder sbBuilder = new StringBuilder();
foreach (var rowResult in cusRow1.GetOrdersRows())
{
sbBuilder.Append(rowResult.OrderID + " " + rowResult.OrderDate + " " + rowResult.CustomerID + Environment.NewLine);
}
foreach (var rowResult in cusRow2.GetOrdersRows())
{
sbBuilder.Append(rowResult.OrderID + " " + rowResult.OrderDate + " " + rowResult.CustomerID + Environment.NewLine);
}
//通过Orders表中的CustomerID(外键)查找Customers表中的数据
ExampleDb.OrdersRow ordRowResult = (ExampleDb.OrdersRow)nds.Orders.Rows.Find(1);
sbBuilder.Append(ordRowResult.CustomerID + Environment.NewLine);
sbBuilder.Append(ordRowResult.OrderDate + Environment.NewLine);
//修改数据
ExampleDb.CustomersRow cr = ordRowResult.CustomersRow;
sbBuilder.Append(cr.CustomerID);
sbBuilder.Append(cr.CompanyName);
cr.CompanyName = "name19:44";
ndsAdapter.Update(cr);
Console.WriteLine(cr.CompanyName);
//修改数据
ExampleDb.CustomersRow cusRow = nds.Customers.FindByCustomerID(1);
cusRow.CompanyName = "MyCompanyName";
ndsAdapter.Update(cusRow);
Console.WriteLine(cusRow.CompanyName);
//添加一行数据
ExampleDb.CustomersRow newRow = nds.Customers.AddCustomersRow("aMyName");
ndsAdapter.Update(newRow);
//删除一行数据
ndsAdapter.Delete(4, "aMyName");
MessageBox.Show(sbBuilder.ToString());
}
private static void Demo3()
{
ExampleDb nds = new ExampleDb();
ExampleDbTableAdapters.OrdersTableAdapter ordTblApt = new ExampleDbTableAdapters.OrdersTableAdapter();
ordTblApt.Fill(nds.Orders);
StringBuilder sbBuilder = new StringBuilder();
foreach (ExampleDb.OrdersRow ordRow in nds.Orders.Rows)
{
sbBuilder.Append(ordRow.OrderID + " " + ordRow.CustomerID + " " + ordRow.OrderDate + Environment.NewLine);
}
MessageBox.Show(sbBuilder.ToString());
}
private static void Demo2()
{
ExampleDb nds = new ExampleDb();
ExampleDbTableAdapters.CustomersTableAdapter ndsAdapter = new ExampleDbTableAdapters.CustomersTableAdapter();
ndsAdapter.Fill(nds.Customers);
StringBuilder sbBuilder = new StringBuilder();
foreach (ExampleDb.CustomersRow ct in nds.Customers.Rows)
{
sbBuilder.Append(ct.CustomerID + " " + ct.CompanyName + Environment.NewLine);
}
DataRow row = nds.Customers.Rows.Find(1);
sbBuilder.Append(row["CompanyName"]);
MessageBox.Show(sbBuilder.ToString());
}
public CategoriesController(ExampleDb context)
{
_context = context;
}
public ProductsController(ExampleDb context)
{
_context = context;
}
public orderHistoriesController(ExampleDb context)
{
_context = context;
}
public RegisterController(ExampleDb context)
{
}
