public async Task DeleteCategories()
{
#region 除
try
{
using (var context = new EFCoreStoreContext())
{
//var roots =await (from c in context.Categories.AsTracking()
// where c.ParentId == null
// select c).ToListAsync();
var roots = await context.Categories.AsNoTracking().Where(c => c.ParentId == null).ToListAsync();
foreach (var c in roots)
{
await RecursiveDeleteCategory(c, context);
}
};
//1.单独删除BlogImage
//var sroredBlogImage1 = await context.BlogImages.FirstOrDefaultAsync(bi => bi.BlogImageId == 10);
//var blogId1 = sroredBlogImage1.BlogId;
//if (sroredBlogImage1 != null)
//{
// context.BlogImages.Remove(sroredBlogImage1);
// await context.SaveChangesAsync();
//}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
#endregion
}
private async Task RecursiveDeleteCategory(Category currentCategory, EFCoreStoreContext context)
{
var subCategories = await(from c in context.Categories.AsNoTracking()
where c.ParentId == currentCategory.CategoryId
select c).ToListAsync();
foreach (var child in subCategories)
{
await RecursiveDeleteCategory(child, context);
}
try
{
using (EFCoreStoreContext dbContex = new EFCoreStoreContext())
{
var sroredCategory = await dbContex.Categories.SingleOrDefaultAsync(c => c.CategoryId == currentCategory.CategoryId);
if (sroredCategory != null)
{
Console.WriteLine($"正在删:\t\tName:{currentCategory.Name}\tPath:{currentCategory.Path}");
dbContex.Categories.Remove(sroredCategory);
await dbContex.SaveChangesAsync();
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
public async Task AddCategories()
{
var context = new EFCoreStoreContext();
#region 保存
try
{
var category1 = new Category {
Name = "category1", Path = "1", Parent = null
};
context.Categories.Add(category1);
await context.SaveChangesAsync();
var category2 = new Category {
Name = "category2", Path = "1:2", Parent = category1
};
context.Categories.Add(category2);
await context.SaveChangesAsync();
var category3 = new Category {
Name = "category3", Path = "1:3", Parent = category1
};
context.Categories.Add(category3);
await context.SaveChangesAsync();
var category4 = new Category {
Name = "category4", Path = "1:3:4", Parent = category3
};
context.Categories.Add(category4);
await context.SaveChangesAsync();
var category5 = new Category {
Name = "category5", Path = "1:3:5", Parent = category3
};
context.Categories.Add(category5);
await context.SaveChangesAsync();
var category6 = new Category {
Name = "category6", Path = "6", Parent = null
};
context.Categories.Add(category6);
await context.SaveChangesAsync();
var category7 = new Category {
Name = "category7", Path = "6:7", Parent = category6
};
context.Categories.Add(category7);
await context.SaveChangesAsync();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
context.Dispose();
}
#endregion
}
public async Task <IEnumerable <Category> > GetCategories()
{
List <Category> categories = new List <Category>();
using (var context = new EFCoreStoreContext())
{
var roots = await(from c in context.Categories.AsNoTracking()
where c.ParentId == null
select c).ToListAsync();
foreach (var c in roots)
{
await RecursiveCategory(c, categories, context);
}
}
return(categories);
}
public async Task ClearCategories()
{
#region 全部删除
try
{
using (var context = new EFCoreStoreContext())
{
context.Database.OpenConnection();
await context.Database.ExecuteSqlCommandAsync("DELETE FROM Category");
context.Database.CloseConnection();
};
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
#endregion
}
private async Task RecursiveCategory(Category currentCategory, List <Category> categories, EFCoreStoreContext context)
{
categories.Add(currentCategory);
// Console.WriteLine($"Name:{currentCategory.Name}\tPath:{currentCategory.Path}");
var subCategories = await(from c in context.Categories.AsNoTracking()
where c.ParentId == currentCategory.CategoryId
select c).ToListAsync();
foreach (var child in subCategories)
{
await RecursiveCategory(child, categories, context);
}
Console.WriteLine($"Name:{currentCategory.Name}\tPath:{currentCategory.Path}");
}
public async void PhotographTesterOneToOne()
{
var context = new EFCoreStoreContext();
#region 保存
#endregion
try
{
//byte[] thumbBits = new byte[100];
//byte[] fullBits = new byte[2000];
//var photograph1 = new Photograph
//{
// Title = "Photograph1",
// ThumbnailBits = thumbBits,
// PhotographFullImage = new PhotographFullImage { HighResolutionBits = fullBits }
//};
//var photograph2 = new Photograph
//{
// Title = "Photograph2",
// ThumbnailBits = new byte[100],
// PhotographFullImage = new PhotographFullImage { HighResolutionBits = new byte[2000] }
//};
//context.Photographs.Add(photograph1);
//context.Photographs.Add(photograph2);
//await context.SaveChangesAsync();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
#region 更新
Photograph updatePhotograph = null;
try
{
//updatePhotograph = await (from p in context.Photographs.Include(p=> p.PhotographFullImage)
// where p.PhotoId == 1
// select p).FirstOrDefaultAsync();
//if (updatePhotograph != null)
//{
// updatePhotograph.Title= "UpdatedPhotograph1";
// updatePhotograph.PhotographFullImage.HighResolutionBits = new byte[2001];
// context.Entry<Photograph>(updatePhotograph).State = EntityState.Modified;
// await context.SaveChangesAsync();
//}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
#endregion
#region 除
try
{
//var delPhotograph = await context.Photographs.FirstOrDefaultAsync(p => p.PhotoId == 2);
//if (delPhotograph != null)
//{
// context.Photographs.Remove(delPhotograph);
// await context.SaveChangesAsync();
//}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
#endregion
try
{
//var photographs = from p in context.Photographs
// select new { Title = p.Title, ThumbnailBitsLength = p.ThumbnailBits.Length, PhotographFullImage = p.PhotographFullImage.HighResolutionBits.Length };
//foreach (var photo in photographs)
//{
// Console.WriteLine($"Photo: {photo.Title}, ThumbnailSize {photo.PhotographFullImage} bytes");
// Console.WriteLine($"Photo: {0}, ThumbnailSize {photo.ThumbnailBitsLength} bytes");
//}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
context.Dispose();
}
public async void StudentTesterOneToZeroOrOne()
{
var context = new EFCoreStoreContext();
#region 保存
try
{
// //Student和StudentAddress必需一起保存
// var student1 = new Student
// {
// Name = "Student1",
// Address = new StudentAddress { Contry = "Contry1", State = "State1", City = "City1", Address1 = "Address1", Address2 = null, PostCode = null }
// };
// var address2 = new StudentAddress { Contry = "Contry2", State = "State2", City = "City2", Address1 = "Address1", Address2 = null, PostCode = "PostCode2" };
// var student2 = new Student
// {
// Name = "Student2",
// Address = address2
// };
// var student3 = new Student
// {
// Name = "Student3",
// Address = new StudentAddress { Contry = "Contry3", State = "State3", City = "City3", Address1 = "Address3", Address2 = null, PostCode = null }
// };
// var student4 = new Student
// {
// Name = "Student4",
// Address = new StudentAddress { Contry = "Contry4", State = "State4", City = "City4", Address1 = "Address4", Address2 = null, PostCode = null }
// };
//单独保存Student
//Address = new StudentAddress { Contry = "Contry5", State = "State5", City = "City5", Address1 = "Address5", Address2 = null, PostCode = "PostCode5" }
//var student5 = new Student
//{
// Name = "Student5"
//};
//context.Students.Add(student5);
//await context.SaveChangesAsync();
// context.Students.Add(student1);
// context.Students.Add(student2);
// context.Students.Add(student3);
// context.Students.Add(student4);
// await context.SaveChangesAsync();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
#endregion
#region 更新
//Student updateStudent = null;
//try
//{
// updateStudent = await (from stu in context.Students.Include(s => s.Address)
// where stu.StudentId == 1
// select stu).FirstOrDefaultAsync();
// if (updateStudent != null)
// {
// updateStudent.Name = "UpdateStudent1";
// updateStudent.Address.Address1 = "UpdateAddress1";
// updateStudent.Address.Address2 = null;
// context.Entry<Student>(updateStudent).State = EntityState.Modified;
// await context.SaveChangesAsync();
// }
//}
//catch (Exception ex)
//{
// Console.WriteLine(ex.Message);
//}
#endregion
#region 除
//try
//{
// var sroredStudent = await context.Students.FirstOrDefaultAsync(stu => stu.StudentId ==2);
// if (sroredStudent != null)
// {
// context.Students.Remove(sroredStudent);
// await context.SaveChangesAsync();
// }
//}
//catch (Exception ex)
//{
// Console.WriteLine(ex.Message);
//}
#endregion
try
{
//var students = from stu in context.Students
// select new { Name = stu.Name, Address = $"{ stu.Address.Contry }-{ stu.Address.State}-{ stu.Address.City}-{ stu.Address.Address1}-{ stu.Address.Address2?? "No Address2"}-{ stu.Address.PostCode?? "No PostCode"}" };
//await students.ForEachAsync(stu =>
//{
// Console.WriteLine($"Name: {stu.Name}");
// Console.WriteLine($"Address: {stu.Address}");
//});
//var students = from stu in context.Students
// select new { Name = stu.Name, Contry = stu.Address.Contry, State = stu.Address.State, City = stu.Address.City, Address1 = stu.Address.Address1, Address2 = stu.Address.Address2, PostCode = stu.Address.PostCode };
//var students = from stu in context.Students.Include(s => s.Address)
// select stu;
//await students.ForEachAsync(stu =>
//{
// Console.WriteLine($"Name: {stu.Name}");
// Console.WriteLine($"{ stu.Address.Contry }-{ stu.Address.State}-{ stu.Address.City}-{ stu.Address.Address1}-{ stu.Address.Address2 ?? "\"No Address2\""}-{ stu.Address.PostCode ?? "\"No PostCode\""}");
//});
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
context.Dispose();
}
public async void BlogOneToZeroOrOneTester()
{
var context = new EFCoreStoreContext();
#region 保存
try
{
#region 1.先保存BlogImage,再保存Blog
//var blogImage2 = new BlogImage { Caption = "Image2", Image = new byte[20] };
//context.BlogImages.Add(blogImage2);
//await context.SaveChangesAsync();
//var blog2 = new Blog
//{
// Title = "Blog2",
// Url = "http://Blog2",
// BlogImage = blogImage2
//};
//context.Blogs.Add(blog2);
//await context.SaveChangesAsync();
#endregion
#region 2.先Blog,再保存BlogImage
//var blog3 = new Blog
//{
// Title = "Blog3",
// Url = "http://www.cnblogs.com/Allen-Li/category/329682.html"
//};
//context.Blogs.Add(blog3);
//await context.SaveChangesAsync();
//var blogImage3 = new BlogImage { Caption = "Image3", Image = new byte[20], BlogId = blog3.BlogId };
//context.BlogImages.Add(blogImage3);
//await context.SaveChangesAsync();
#endregion
#region 3.Blog和BlogImage一起保存
//var blog4 = new Blog
//{
// Title = "Blog4",
// Url = "http://www.cnblogs.com/Gyoung/tag/Entity%20Framework/",
// BlogImage = new BlogImage { Caption = "Image4", Image = new byte[50] }
//};
//var blog5 = new Blog
//{
// Title = "Blog5",
// Url = "http://www.cnblogs.com/Gyoung/tag/Entity%20Framework/",
// BlogImage = new BlogImage { Caption = "Image5", Image = new byte[50] }
//};
//context.Blogs.Add(blog4);
//context.Blogs.Add(blog5);
//await context.SaveChangesAsync();
#endregion
#region 4.单独保存BlogImage
//var blogImage1 = new BlogImage { Caption = "Image1", Image = new byte[200] };
//context.BlogImages.Add(blogImage1);
//await context.SaveChangesAsync();
#endregion
#region 5.单独保存Blog
//var blog1 = new Blog
//{
// Title = "Blog1",
// Url = "http://blog1"
//};
//context.Blogs.Add(blog1);
//await context.SaveChangesAsync();
#endregion
#region 6.Title重复(Unique Constraints)
//var blog6 = new Blog
//{
// Title = "Blog5",
// Url = "http://Blog5/",
// BlogImage = new BlogImage { Caption = "Image4", Image = new byte[50] }
//};
//context.Blogs.Add(blog6);
//await context.SaveChangesAsync();
#endregion
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
#endregion
#region 更新
//Blog updateBlog = null;
//BlogImage updateBlogImage = null;
//try
//{
// updateBlogImage = await (from bi in context.BlogImages
// where bi.BlogImageId == 3
// select bi).FirstOrDefaultAsync();
// if (updateBlogImage != null)
// {
// updateBlogImage.Caption = "UpdateCaption1";
// updateBlogImage.Image = new byte[110];
// context.Entry<BlogImage>(updateBlogImage).State = EntityState.Modified;
// await context.SaveChangesAsync();
// }
// updateBlog = await (from b in context.Blogs.Include(b => b.BlogImage)
// where b.BlogId == 7
// select b).FirstOrDefaultAsync();
// if (updateBlog != null)
// {
// updateBlog.Title = "UpdateBlog2";
// updateBlog.BlogImage.Caption = "UpdateCaption2";
// updateBlog.BlogImage.Image = new byte[10];
// context.Entry<Blog>(updateBlog).State = EntityState.Modified;
// await context.SaveChangesAsync();
// }
//}
//catch (Exception ex)
//{
// Console.WriteLine(ex.Message);
//}
#endregion
#region 除
try
{
#region 全部删除
//context.Database.OpenConnection();
//await context.Database.ExecuteSqlCommandAsync("DELETE FROM BlogImage");
//await context.Database.ExecuteSqlCommandAsync("DELETE FROM Blog");
//context.Database.CloseConnection();
#endregion
//1.单独删除BlogImage
//var sroredBlogImage1 = await context.BlogImages.FirstOrDefaultAsync(bi => bi.BlogImageId == 10);
//var blogId1 = sroredBlogImage1.BlogId;
//if (sroredBlogImage1 != null)
//{
// context.BlogImages.Remove(sroredBlogImage1);
// await context.SaveChangesAsync();
//}
//2.先删除BlogImage，再删除Blog
//var sroredBlogImage2 = await context.BlogImages.FirstOrDefaultAsync(bi => bi.BlogImageId == 13);
//var blogId2 = sroredBlogImage2.BlogId;
//if (sroredBlogImage2 != null)
//{
// context.BlogImages.Remove(sroredBlogImage2);
// await context.SaveChangesAsync();
// var sroredBlog2 = await context.Blogs.FirstOrDefaultAsync(b => b.BlogId == blogId2);
// if (sroredBlog2 != null)
// {
// context.Blogs.Remove(sroredBlog2);
// await context.SaveChangesAsync();
// }
//}
//3.删除Blog,自动删除BlogImage
//var sroredBlog3 = await context.Blogs.Include(b => b.BlogImage).Where(b => b.BlogId == 2).FirstOrDefaultAsync();
//if (sroredBlog3 != null)
//{
// context.Blogs.Remove(sroredBlog3);
// await context.SaveChangesAsync();
//}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
#endregion
#region 读取
//var task1 = System.Threading.Tasks.Task.Run(async () =>
// {
// var blogs = from b in context.Blogs.Include(b => b.BlogImage)
// select b;
// //var blogs = from b in context.Blogs
// // select new { Title = b.Title, ImageCaptiop = b.BlogImage.Caption, ImageLength = b.BlogImage.Image.Length };
// await blogs.ForEachAsync(blog =>
// {
// Console.WriteLine($"Blog: {blog.Title}");
// string imageCaptiop = blog.BlogImage != null ? blog.BlogImage.Caption : "\"No BlogImage Caption\"";
// int imageLength = blog.BlogImage != null ? blog.BlogImage.Image.Length : 0;
// Console.WriteLine($"ImageCaptiop: { imageCaptiop}, ImageSize {imageLength} bytes");
// });
// });
//var task2 = System.Threading.Tasks.Task.Run(async () =>
//{
// var blogs = from b in context.Blogs
// from bi in context.BlogImages
// where b.BlogId == bi.BlogId
// select b;
// await blogs.ForEachAsync(blog =>
// {
// Console.WriteLine($"Blog: {blog.Title}");
// string imageCaptiop = blog.BlogImage != null ? blog.BlogImage.Caption : "\"No BlogImage Caption\"";
// int imageLength = blog.BlogImage != null ? blog.BlogImage.Image.Length : 0;
// Console.WriteLine($"ImageCaptiop: { imageCaptiop}, ImageSize {imageLength} bytes");
// });
//});
//await System.Threading.Tasks.Task.WhenAll(task1, task2);
#endregion
context.Dispose();
//foreach (var blog in blogs)
//{
// Console.WriteLine($"Blog: {blog.Title}");
// Console.WriteLine($"ImageCaptiop: {blog.ImageCaptiop}, ImageSize {blog.ImageLength} bytes");
//}
}
public DbContextGenerator()
{
EFCoreStoreContext = new EFCoreStoreContext();
}
