static void Main(string[] args)
{
//-- Poor-man DI - build our dependencies by hand for this demo
//var dbcontextFactory = new UserManagementDbContextFactory("data source=192.168.0.11;initial catalog=DbContextScopeDemo1;persist security info=True;user id=test;password=111111;MultipleActiveResultSets=True;App=EntityFramework");
var dbcontextFactory = new DbContextFactory("server=127.0.0.1;port=3306;AutoEnlist=true;user id=root;password=jooge2012;persistsecurityinfo=True;database=test;oldguids=True");
var dbContextScopeFactory = new DbContextScopeFactory(dbcontextFactory);
var ambientDbContextLocator = new AmbientDbContextLocator();
var userRepository = new UserRepository(ambientDbContextLocator);
var userCreationService = new UserCreationService(dbContextScopeFactory, userRepository);
var userQueryService = new UserQueryService(dbContextScopeFactory, userRepository);
var userEmailService = new UserEmailService(dbContextScopeFactory);
var userCreditScoreService = new UserCreditScoreService(dbContextScopeFactory);
var userClassService = new UserClassService(dbContextScopeFactory);
try
{
Console.WriteLine("This demo application will create a database named DbContextScopeDemo in the default SQL Server instance on localhost. Edit the connection string in UserManagementDbContext if you'd like to create it somewhere else.");
Console.WriteLine("Press enter to start...");
Console.ReadLine();
Console.WriteLine("一个dbScope中使用2个DbContext 创建 a user and userClass Terry+English...");
var user = new User
{
Id = Guid.NewGuid(),
Name = "Terry",
Email = "*****@*****.**",
WelcomeEmailSent = false,
CreatedOn = DateTime.UtcNow
};
using (var dbContextScope = dbContextScopeFactory.Create())
{
dbContextScope.DbContexts.Get <UserManagementDbContext>().Users.Add(user);
userClassService.CreateUserClass(user.Name, "English");
dbContextScope.SaveChanges();
}
Console.WriteLine("检查数据库应该有相应的记录user表 和 userClass表");
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
Console.WriteLine("2个dbcontext 使用事务的情况，");
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
user = new User
{
Id = Guid.NewGuid(),
Name = "Mark",
Email = "*****@*****.**",
WelcomeEmailSent = false,
CreatedOn = DateTime.UtcNow
};
int rowCount = 0;
try
{
using (var s = new TransactionScope())
{
using (var dbContextScope = dbContextScopeFactory.Create())
{
dbContextScope.DbContexts.Get <UserManagementDbContext>().Users.Add(user);
dbContextScope.SaveChanges();
}
rowCount = userClassService.GetRowCount();
userClassService.CreateUserClass(user.Name, "English");
throw new Exception("模拟错误");
s.Complete();
}
}
catch
{
}
var tempUsers = userQueryService.GetUsers(user.Id);
Console.WriteLine("Found {0} persisted users. If this number is 0, we're all good. If this number is not 0, we have a big problem.", tempUsers.Count());
if (rowCount == userClassService.GetRowCount())
{
Console.WriteLine("userClass表的数量没有变化，是正确的，如果变化了就不对了");
}
else
{
Console.WriteLine("userClass表的数量变化了，是不对的。");
}
//-- Demo of typical usage for read and writes
Console.WriteLine("Creating a user called Mary...");
var marysSpec = new UserCreationSpec("Mary", "*****@*****.**");
userCreationService.CreateUser(marysSpec);
Console.WriteLine("Done.\n");
Console.WriteLine("Trying to retrieve our newly created user from the data store...");
var mary = userQueryService.GetUser(marysSpec.Id);
Console.WriteLine("OK. Persisted user: {0}", mary);
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demo of nested DbContextScopes
Console.WriteLine("Creating 2 new users called John and Jeanne in an atomic transaction...");
var johnSpec = new UserCreationSpec("John", "*****@*****.**");
var jeanneSpec = new UserCreationSpec("Jeanne", "*****@*****.**");
userCreationService.CreateListOfUsers(johnSpec, jeanneSpec);
Console.WriteLine("Done.\n");
Console.WriteLine("Trying to retrieve our newly created users from the data store...");
var createdUsers = userQueryService.GetUsers(johnSpec.Id, jeanneSpec.Id);
Console.WriteLine("OK. Found {0} persisted users.", createdUsers.Count());
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demo of nested DbContextScopes in the face of an exception.
// If any of the provided users failed to get persisted, none should get persisted.
Console.WriteLine("Creating 2 new users called Julie and Marc in an atomic transaction. Will make the persistence of the second user fail intentionally in order to test the atomicity of the transaction...");
var julieSpec = new UserCreationSpec("Julie", "*****@*****.**");
var marcSpec = new UserCreationSpec("Marc", "*****@*****.**");
try
{
userCreationService.CreateListOfUsersWithIntentionalFailure(julieSpec, marcSpec);
Console.WriteLine("Done.\n");
}
catch (Exception e)
{
Console.WriteLine(e.Message);
Console.WriteLine();
}
Console.WriteLine("Trying to retrieve our newly created users from the data store...");
var maybeCreatedUsers = userQueryService.GetUsers(julieSpec.Id, marcSpec.Id);
Console.WriteLine("Found {0} persisted users. If this number is 0, we're all good. If this number is not 0, we have a big problem.", maybeCreatedUsers.Count());
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demo of DbContextScope within an async flow
Console.WriteLine("Trying to retrieve two users John and Jeanne sequentially in an asynchronous manner...");
// We're going to block on the async task here as we don't have a choice. No risk of deadlocking in any case as console apps
// don't have a synchronization context.
var usersFoundAsync = userQueryService.GetTwoUsersAsync(johnSpec.Id, jeanneSpec.Id).Result;
Console.WriteLine("OK. Found {0} persisted users.", usersFoundAsync.Count());
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demo of explicit database transaction.
Console.WriteLine("Trying to retrieve user John within a READ UNCOMMITTED database transaction...");
// You'll want to use SQL Profiler or Entity Framework Profiler to verify that the correct transaction isolation
// level is being used.
var userMaybeUncommitted = userQueryService.GetUserUncommitted(johnSpec.Id);
Console.WriteLine("OK. User found: {0}", userMaybeUncommitted);
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demo of disabling the DbContextScope nesting behaviour in order to force the persistence of changes made to entities
// This is a pretty advanced feature that you can safely ignore until you actually need it.
Console.WriteLine("Will simulate sending a Welcome email to John...");
using (var parentScope = dbContextScopeFactory.Create())
{
var parentDbContext = parentScope.DbContexts.Get <UserManagementDbContext>();
// Load John in the parent DbContext
var john = parentDbContext.Users.Find(johnSpec.Id);
Console.WriteLine("Before calling SendWelcomeEmail(), john.WelcomeEmailSent = " + john.WelcomeEmailSent);
// Now call our SendWelcomeEmail() business logic service method, which will
// update John in a non-nested child context
userEmailService.SendWelcomeEmail(johnSpec.Id);
// Verify that we can see the modifications made to John by the SendWelcomeEmail() method
Console.WriteLine("After calling SendWelcomeEmail(), john.WelcomeEmailSent = " + john.WelcomeEmailSent);
// Note that even though we're not calling SaveChanges() in the parent scope here, the changes
// made to John by SendWelcomeEmail() will remain persisted in the database as SendWelcomeEmail()
// forced the creation of a new DbContextScope.
}
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demonstration of DbContextScope and parallel programming
Console.WriteLine("Calculating and storing the credit score of all users in the database in parallel...");
userCreditScoreService.UpdateCreditScoreForAllUsers();
Console.WriteLine("Done.");
Console.WriteLine("Trying to retrieve users by where clause.");
var users = userQueryService.GetUserByWhereClause(" WelcomeEmailSent = 1 ");
Console.WriteLine("OK. WelcomeEmailSent user count: {0}", users.Count());
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
}
catch (Exception e)
{
Console.WriteLine(e);
}
Console.WriteLine();
Console.WriteLine("The end.");
Console.WriteLine("Press enter to exit...");
Console.ReadLine();
}
static void Main(string[] args)
{
//-- Poor-man DI - build our dependencies by hand for this demo
var dbContextScopeFactory = new DbContextScopeFactory();
var ambientDbContextLocator = new AmbientDbContextLocator();
var userRepository = new UserRepository(ambientDbContextLocator);
var userCreationService = new UserCreationService(dbContextScopeFactory, userRepository);
var userQueryService = new UserQueryService(dbContextScopeFactory, userRepository);
var userEmailService = new UserEmailService(dbContextScopeFactory);
var userCreditScoreService = new UserCreditScoreService(dbContextScopeFactory);
try
{
Console.WriteLine("This demo application will create a database named DbContextScopeDemo in the default SQL Server instance on localhost. Edit the connection string in UserManagementDbContext if you'd like to create it somewhere else.");
Console.WriteLine("Press enter to start...");
Console.ReadLine();
//-- Demo of typical usage for read and writes
Console.WriteLine("Creating a user called Mary...");
var marysSpec = new UserCreationSpec("Mary", "*****@*****.**");
userCreationService.CreateUser(marysSpec);
Console.WriteLine("Done.\n");
Console.WriteLine("Trying to retrieve our newly created user from the data store...");
var mary = userQueryService.GetUser(marysSpec.Id);
Console.WriteLine("OK. Persisted user: {0}", mary);
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demo of nested DbContextScopes
Console.WriteLine("Creating 2 new users called John and Jeanne in an atomic transaction...");
var johnSpec = new UserCreationSpec("John", "*****@*****.**");
var jeanneSpec = new UserCreationSpec("Jeanne", "*****@*****.**");
userCreationService.CreateListOfUsers(johnSpec, jeanneSpec);
Console.WriteLine("Done.\n");
Console.WriteLine("Trying to retrieve our newly created users from the data store...");
var createdUsers = userQueryService.GetUsers(johnSpec.Id, jeanneSpec.Id);
Console.WriteLine("OK. Found {0} persisted users.", createdUsers.Count());
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demo of nested DbContextScopes in the face of an exception.
// If any of the provided users failed to get persisted, none should get persisted.
Console.WriteLine("Creating 2 new users called Julie and Marc in an atomic transaction. Will make the persistence of the second user fail intentionally in order to test the atomicity of the transaction...");
var julieSpec = new UserCreationSpec("Julie", "*****@*****.**");
var marcSpec = new UserCreationSpec("Marc", "*****@*****.**");
try
{
userCreationService.CreateListOfUsersWithIntentionalFailure(julieSpec, marcSpec);
Console.WriteLine("Done.\n");
}
catch (Exception e)
{
Console.WriteLine(e.Message);
Console.WriteLine();
}
Console.WriteLine("Trying to retrieve our newly created users from the data store...");
var maybeCreatedUsers = userQueryService.GetUsers(julieSpec.Id, marcSpec.Id);
Console.WriteLine("Found {0} persisted users. If this number is 0, we're all good. If this number is not 0, we have a big problem.", maybeCreatedUsers.Count());
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demo of DbContextScope within an async flow
Console.WriteLine("Trying to retrieve two users John and Jeanne sequentially in an asynchronous manner...");
// We're going to block on the async task here as we don't have a choice. No risk of deadlocking in any case as console apps
// don't have a synchronization context.
var usersFoundAsync = userQueryService.GetTwoUsersAsync(johnSpec.Id, jeanneSpec.Id).Result;
Console.WriteLine("OK. Found {0} persisted users.", usersFoundAsync.Count());
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demo of explicit database transaction.
Console.WriteLine("Trying to retrieve user John within a READ UNCOMMITTED database transaction...");
// You'll want to use SQL Profiler or Entity Framework Profiler to verify that the correct transaction isolation
// level is being used.
var userMaybeUncommitted = userQueryService.GetUserUncommitted(johnSpec.Id);
Console.WriteLine("OK. User found: {0}", userMaybeUncommitted);
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demo of disabling the DbContextScope nesting behaviour in order to force the persistence of changes made to entities
// This is a pretty advanced feature that you can safely ignore until you actually need it.
Console.WriteLine("Will simulate sending a Welcome email to John...");
using (var parentScope = dbContextScopeFactory.Create())
{
var parentDbContext = parentScope.DbContexts.Get <UserManagementDbContext>();
// Load John in the parent DbContext
var john = parentDbContext.Users.Find(johnSpec.Id);
Console.WriteLine("Before calling SendWelcomeEmail(), john.WelcomeEmailSent = " + john.WelcomeEmailSent);
// Now call our SendWelcomeEmail() business logic service method, which will
// update John in a non-nested child context
userEmailService.SendWelcomeEmail(johnSpec.Id);
// Verify that we can see the modifications made to John by the SendWelcomeEmail() method
Console.WriteLine("After calling SendWelcomeEmail(), john.WelcomeEmailSent = " + john.WelcomeEmailSent);
// Note that even though we're not calling SaveChanges() in the parent scope here, the changes
// made to John by SendWelcomeEmail() will remain persisted in the database as SendWelcomeEmail()
// forced the creation of a new DbContextScope.
}
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demonstration of DbContextScope and parallel programming
Console.WriteLine("Calculating and storing the credit score of all users in the database in parallel...");
userCreditScoreService.UpdateCreditScoreForAllUsers();
Console.WriteLine("Done.");
}
catch (Exception e)
{
Console.WriteLine(e);
}
Console.WriteLine();
Console.WriteLine("The end.");
Console.WriteLine("Press enter to exit...");
Console.ReadLine();
}
static void Main(string[] args)
{
//-- Poor-man DI - build our dependencies by hand for this demo
IDbScopeFactory dbScopeFactory = new EntityFrameworkScopeFactory();
IAmbientDbLocator ambientDbLocator = new EntityFrameworkAmbientLocator();
IUserRepository userRepository = new UserRepository(ambientDbLocator);
var userCreationService = new UserCreationService(dbScopeFactory, userRepository);
var userQueryService = new UserQueryService(dbScopeFactory, userRepository);
var userEmailService = new UserEmailService(dbScopeFactory);
var userCreditScoreService = new UserCreditScoreService(dbScopeFactory);
try
{
Console.WriteLine("This demo application will create a database named DbContextScopeDemo in the default SQL Server instance on localhost. Edit the connection string in UserManagementDbContext if you'd like to create it somewhere else.");
Console.WriteLine("Press enter to start...");
Console.ReadLine();
//-- Demo of typical usage for read and writes
Console.WriteLine("Creating a user called Mary...");
var marysSpec = new UserCreationSpec("Mary", "*****@*****.**");
userCreationService.CreateUser(marysSpec);
Console.WriteLine("Done.\n");
Console.WriteLine("Trying to retrieve our newly created user from the data store...");
var mary = userQueryService.GetUser(marysSpec.Id);
Console.WriteLine("OK. Persisted user: {0}", mary);
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demo of nested DbScopes
Console.WriteLine("Creating 2 new users called John and Jeanne in an atomic transaction...");
var johnSpec = new UserCreationSpec("John", "*****@*****.**");
var jeanneSpec = new UserCreationSpec("Jeanne", "*****@*****.**");
userCreationService.CreateListOfUsers(johnSpec, jeanneSpec);
Console.WriteLine("Done.\n");
Console.WriteLine("Trying to retrieve our newly created users from the data store...");
var createdUsers = userQueryService.GetUsers(johnSpec.Id, jeanneSpec.Id);
Console.WriteLine("OK. Found {0} persisted users.", createdUsers.Count());
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demo of nested DbScopes in the face of an exception.
// If any of the provided users failed to get persisted, none should get persisted.
Console.WriteLine("Creating 2 new users called Julie and Marc in an atomic transaction. Will make the persistence of the second user fail intentionally in order to test the atomicity of the transaction...");
var julieSpec = new UserCreationSpec("Julie", "*****@*****.**");
var marcSpec = new UserCreationSpec("Marc", "*****@*****.**");
try
{
userCreationService.CreateListOfUsersWithIntentionalFailure(julieSpec, marcSpec);
Console.WriteLine("Done.\n");
}
catch (Exception e)
{
Console.WriteLine(e.Message);
Console.WriteLine();
}
Console.WriteLine("Trying to retrieve our newly created users from the data store...");
var maybeCreatedUsers = userQueryService.GetUsers(julieSpec.Id, marcSpec.Id);
Console.WriteLine("Found {0} persisted users. If this number is 0, we're all good. If this number is not 0, we have a big problem.", maybeCreatedUsers.Count());
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demo of DbScope within an async flow
Console.WriteLine("Trying to retrieve two users John and Jeanne sequentially in an asynchronous manner...");
// We're going to block on the async task here as we don't have a choice. No risk of deadlocking in any case as console apps
// don't have a synchronization context.
var usersFoundAsync = userQueryService.GetTwoUsersAsync(johnSpec.Id, jeanneSpec.Id).Result;
Console.WriteLine("OK. Found {0} persisted users.", usersFoundAsync.Count());
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demo of explicit database transaction.
Console.WriteLine("Trying to retrieve user John within a READ UNCOMMITTED database transaction...");
// You'll want to use SQL Profiler or Entity Framework Profiler to verify that the correct transaction isolation
// level is being used.
var userMaybeUncommitted = userQueryService.GetUserUncommitted(johnSpec.Id);
Console.WriteLine("OK. User found: {0}", userMaybeUncommitted);
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demo of disabling the DbScope nesting behaviour in order to force the persistence of changes made to entities
// This is a pretty advanced feature that you can safely ignore until you actually need it.
Console.WriteLine("Will simulate sending a Welcome email to John...");
using (var parentScope = dbScopeFactory.Create())
{
var parentDbContext = parentScope.Get<UserManagementDbContext>();
// Load John in the parent DbContext
var john = parentDbContext.Users.Find(johnSpec.Id);
Console.WriteLine("Before calling SendWelcomeEmail(), john.WelcomeEmailSent = " + john.WelcomeEmailSent);
// Now call our SendWelcomeEmail() business logic service method, which will
// update John in a non-nested child context
userEmailService.SendWelcomeEmail(johnSpec.Id);
// Verify that we can see the modifications made to John by the SendWelcomeEmail() method
Console.WriteLine("After calling SendWelcomeEmail(), john.WelcomeEmailSent = " + john.WelcomeEmailSent);
// Note that even though we're not calling SaveChanges() in the parent scope here, the changes
// made to John by SendWelcomeEmail() will remain persisted in the database as SendWelcomeEmail()
// forced the creation of a new DbScope.
}
Console.WriteLine("Press enter to continue...");
Console.ReadLine();
//-- Demonstration of DbScope and parallel programming
Console.WriteLine("Calculating and storing the credit score of all users in the database in parallel...");
userCreditScoreService.UpdateCreditScoreForAllUsers();
Console.WriteLine("Done.");
}
catch (Exception e)
{
Console.WriteLine(e);
}
Console.WriteLine();
Console.WriteLine("The end.");
Console.WriteLine("Press enter to exit...");
Console.ReadLine();
}