public static void InsertOrUpdateGraph(BloggingContext context, Blog blog)
{
var existingBlog = context.Blogs
.Include(b => b.Posts)
.FirstOrDefault(b => b.BlogId == blog.BlogId);
if (existingBlog == null)
{
context.Add(blog);
}
else
{
context.Entry(existingBlog).CurrentValues.SetValues(blog);
foreach (var post in blog.Posts)
{
var existingPost = existingBlog.Posts
.FirstOrDefault(p => p.PostId == post.PostId);
if (existingPost == null)
{
existingBlog.Posts.Add(post);
}
else
{
context.Entry(existingPost).CurrentValues.SetValues(post);
}
}
}
context.SaveChanges();
}
public static async Task InsertOrUpdateGraphAsync(BloggingContext context, Blog blog)
{
var existingBlog = await context.Blogs
.Include(b => b.Posts)
.FirstOrDefaultAsync(b => b.BlogId == blog.BlogId);
if (existingBlog == null)
{
context.Add(blog);
}
else
{
context.Entry(existingBlog).CurrentValues.SetValues(blog);
foreach (var post in blog.Posts)
{
var existingPost = await existingBlog.Posts
.AsQueryable()
.FirstOrDefaultAsync(p => p.PostId == post.PostId);
if (existingPost == null)
{
existingBlog.Posts.Add(post);
}
else
{
context.Entry(existingPost).CurrentValues.SetValues(post);
}
}
}
await context.SaveChangesAsync();
}
public static void InsertOrUpdate(BloggingContext context, Blog blog)
{
var existingBlog = context.Blogs.Find(blog.BlogId);
if (existingBlog == null)
{
context.Add(blog);
}
else
{
context.Entry(existingBlog).CurrentValues.SetValues(blog);
}
context.SaveChanges();
}
public static async Task InsertOrUpdateAsync(BloggingContext context, Blog blog)
{
var existingBlog = await context.Blogs.FindAsync(blog.BlogId);
if (existingBlog == null)
{
context.Add(blog);
}
else
{
context.Entry(existingBlog).CurrentValues.SetValues(blog);
}
await context.SaveChangesAsync();
}
