public int SaveChanges()
{
var context = DbContentFactory.GetCurrentDbContent();
var saved = false;
while (!saved)
{
try
{
// Attempt to save changes to the database
context.SaveChangesAsync();
saved = true;
}
catch (DbUpdateConcurrencyException ex)
{
foreach (var entry in ex.Entries)
{
var databaseValues = entry.GetDatabaseValues();
// Refresh original values to bypass next concurrency check
entry.OriginalValues.SetValues(databaseValues);
}
}
}
return(1);
}
private void InitData(IServiceProvider serviceProvider)
{
var serviceScope = serviceProvider.GetRequiredService <IServiceScopeFactory>().CreateScope();
var context = serviceScope.ServiceProvider.GetService <DataContext>();
DbContentFactory.Initialize(context);//调用静态类方法注入
}
/// <summary>
/// 拿到当前EF的上下文对象，然后进行把修改实体进行一个整体提交（简单说该方法就是让上下文提交）
/// </summary>
/// <returns></returns>
public int SaveChanges()
{
try
{
return(DbContentFactory.GetCurrentDbContent().SaveChanges());//需要添加对Entity Framework.dll的引用
}
catch (Exception)
{
return(1);
}
}
public static void Main(string[] args)
{
var host = CreateWebHostBuilder(args).Build();
var scope = host.Services.CreateScope();
{
var services = scope.ServiceProvider;
try
{
var context = services.GetRequiredService <Models.DataContext>();
DbContentFactory.Initialize(context);
}
catch (Exception ex)
{
var logger = services.GetRequiredService <ILogger <Program> >();
logger.LogError(ex, "An error occurred while seeding the database.");
}
}
host.Run();
}
public DataContext GetDbContent()
{
return(DbContentFactory.GetCurrentDbContent());
}
//----封装SaveChanages----减少用户与数据库之间的会话----单元工作----批量提交----提高性能
//将提交数据操作从Dal层提升到Bll层
/// <summary>
/// DbContentFactory.GetCurrentContext()获取上下文
/// </summary>
/// <returns></returns>
public int SaveChanges()
{
return(DbContentFactory.GetCurrentContext().SaveChanges());
}