/// <summary>
/// 测试 Identity 的处理.
/// </summary>
private static void TestIdeneity()
{
Console.WriteLine("===== 测试父子关系表的 Identity 的处理.");
using (Test context = new Test(connString))
{
test_Identity_tab testMainData = new test_Identity_tab()
{
value = "测试主"
};
test_Identity_tab_Sub testSubData = new test_Identity_tab_Sub()
{
Value = "测试子"
};
testSubData.test_Identity_tab = testMainData;
// 插入.
context.test_Identity_tab.InsertOnSubmit(testMainData);
context.test_Identity_tab_Sub.InsertOnSubmit(testSubData);
Console.WriteLine("Before SubmitChanges testMainData.id = {0}", testMainData.id);
Console.WriteLine("Before SubmitChanges testSubData.id = {0}", testSubData.Id);
context.SubmitChanges();
Console.WriteLine("After SubmitChanges testMainData.id = {0}", testMainData.id);
Console.WriteLine("After SubmitChanges testSubData.id = {0}", testSubData.Id);
}
}
/// <summary>
/// Linq2SQL 基本功能测试
///
/// 基本的 查询 / 插入 / 更新 / 删除 处理.
///
/// </summary>
private static void BaseTest()
{
Test context = new Test(connString);
// 单表查询
var query =
from testMain in context.TestMain
select testMain;
foreach (TestMain main in query)
{
Console.WriteLine("Main[{0}, {1}]", main.Id, main.Value);
}
// 关联查询
var query2 =
from testSub in context.TestSub
where testSub.TestMain.Value == "ONE"
select testSub;
foreach (TestSub sub in query2)
{
Console.WriteLine("Sub[{0}, {1}]", sub.Id, sub.Value);
}
// 插入.
TestMain main3 = new TestMain();
main3.Id = 3;
main3.Value = "Three";
context.TestMain.InsertOnSubmit(main3);
context.SubmitChanges();
Console.WriteLine("INSERT FINISH! --- Please Press Enter Ket");
Console.ReadLine();
// 更新.
var newTestMain =
(from testMain in context.TestMain
where testMain.Id == 3
select testMain).First();
newTestMain.Value = "Three3";
context.SubmitChanges();
Console.WriteLine("UPDATE FINISH! --- Please Press Enter Ket");
Console.ReadLine();
// 单表查询 TOP 2
var queryTop2 =
(from testMain in context.TestMain
orderby testMain.Id descending
select testMain).Take(2);
foreach (TestMain main in queryTop2)
{
Console.WriteLine("Main[{0}, {1}]", main.Id, main.Value);
}
// 删除.
context.TestMain.DeleteOnSubmit(newTestMain);
context.SubmitChanges();
Console.WriteLine("DELETE FINISH! --- Please Press Enter Ket");
Console.ReadLine();
}
/// <summary>
/// 事务处理的测试.
///
/// 隐式创建事务
///
/// </summary>
private static void TransactionTest()
{
// 在我们没有显式的开启事务时，
// DataContext.SubmitChanges在提交时会隐式创建事务
Test context = new Test(connString);
try
{
// 插入.
TestMain main3 = new TestMain();
main3.Id = 3;
main3.Value = "Three";
context.TestMain.InsertOnSubmit(main3);
TestMain main3x = new TestMain();
main3x.Id = 3;
main3x.Value = "Three Err";
context.TestMain.InsertOnSubmit(main3x);
context.SubmitChanges();
}
catch (Exception err)
{
Console.WriteLine(err.ToString());
}
var query =
from testMain in context.TestMain
where testMain.Id == 3
select testMain;
Console.WriteLine("TestMain 表中， id=3 的记录有{0}条 ", query.Count());
}
