public async Task <bool> UpdateAsync(Author item, CancellationToken cancellationToken = default)
{
using (var context = new BookLibraryContext(this._optionsBuilder.Options))
{
var author = await context.Authors.SingleOrDefaultAsync(o => o.Id == item.Id, cancellationToken);
if (author == null)
{
return(false);
}
item.Adapt(author);
await context.SaveChangesAsync(cancellationToken);
return(true);
}
}
public async Task <bool> DeleteAsync(string id, CancellationToken cancellationToken = default)
{
using (var context = new BookLibraryContext(this._optionsBuilder.Options))
{
var item = await context.Books.SingleOrDefaultAsync(o => o.Id == id, cancellationToken);
if (item == null)
{
return(false);
}
context.Books.Remove(item);
await context.SaveChangesAsync(cancellationToken);
return(true);
}
}
public async Task <bool> BorrowBookAsync(string bookId, int customerId, DateTime startDate, CancellationToken cancellationToken = default)
{
using (var context = new BookLibraryContext(this._optionsBuilder.Options))
{
var item = new BorrowHistory
{
BookId = bookId,
CustomerId = customerId,
StartDate = startDate
};
context.BorrowHistories.Add(item);
if (await context.SaveChangesAsync(cancellationToken) == 1)
{
return(true);
}
}
return(false);
}
public async Task <bool> RemoveAuthorFromBookAsync(string bookId, int authorId, CancellationToken cancellationToken = default)
{
using (var context = new BookLibraryContext(this._optionsBuilder.Options))
{
var relation = await context.Book2Authors.SingleOrDefaultAsync(o => o.BookId == bookId && o.AuthorId == authorId, cancellationToken);
if (relation == null)
{
return(false);
}
context.Remove(relation);
if (await context.SaveChangesAsync(cancellationToken) == 1)
{
return(true);
}
}
return(false);
}
public async Task <bool> InitializeDatabaseAsync()
{
try
{
using (var context = new BookLibraryContext(this._optionsBuilder.Options))
{
this._logger.LogInformation("Check database created");
await context.Database.EnsureCreatedAsync();
this._logger.LogInformation("Database is created");
#region Customer
if (!context.Customers.Any(o => o.Id == 1))
{
context.Customers.Add(new Customer
{
Gender = (int)Gender.Male,
Firstname = "Max",
Surname = "Mustermann",
Street = "Musterweg 1a",
PostalCode = "12345",
City = "Musterstadt",
CountryCode = "DE",
Email = "*****@*****.**",
});
}
if (!context.Customers.Any(o => o.Id == 2))
{
context.Customers.Add(new Customer
{
Gender = (int)Gender.Female,
Firstname = "Erika",
Surname = "Mustermann",
Street = "Musterweg 8c",
PostalCode = "1234",
City = "Musterhausen",
CountryCode = "AT",
Email = "*****@*****.**",
});
}
#endregion
#region Book
var author = new Author {
Name = "Jojo Moyes"
};
var publisher = new Publisher {
Name = "Rowohlt Polaris"
};
var book = new Book
{
Id = "9783499267369",
Title = "Weit weg und ganz nah",
Abstract = "Einmal angenommen... dein Mann hat sich aus dem Staub gemacht.",
BookCount = 1,
};
if (!context.Authors.Any(o => o.Id == 1))
{
context.Authors.Add(author);
}
if (!context.Publishers.Any(o => o.Id == 1))
{
context.Publishers.Add(publisher);
}
//Create ids for publisher and author
await context.SaveChangesAsync();
if (!context.Books.Any(o => o.Id == book.Id))
{
book.PublisherId = publisher.Id;
context.Books.Add(book);
context.Book2Authors.Add(new Book2Author {
AuthorId = author.Id, BookId = book.Id
});
}
#endregion
//Save book
await context.SaveChangesAsync();
return(true);
}
}
catch (Exception exception)
{
this._logger.LogError(exception, nameof(InitializeDatabaseAsync));
}
return(false);
}
