Entity Framework Core Lolita

这是Entity Framework Core的一个轻量的扩展，提供批量更新和删除操作的支持。而且这个库出自中国一位MVP之手，虽然内容是英文，也很简单，相信你也能看懂。

This is a light-weight extension which provides bulk update and delete operations for Entity Framework Core.

View source on GitHub
Download from NuGet

Getting Started

① Add Pomelo.EntityFrameworkCore.Lolita package into your project.json. There are many different special versions for different EF database provider:

Pomelo.EntityFrameworkCore.Lolita.MySql
Pomelo.EntityFrameworkCore.Lolita.SqlServer
Pomelo.EntityFrameworkCore.Lolita.PostgreSQL
Pomelo.EntityFrameworkCore.Lolita.Sqlite

② Configure your DbContext

For ASP.NET Core developers, you can Use lolita extensions when adding the DbContext into services collection:

services.AddDbContext<Models.SampleContext>(x =>
{x.UseMySql(      "server=localhost;database=lolita;uid=root;pwd=yourpwd;");x.UseMySqlLolita();
});

For .NET Core developers, you can override the OnConfiguring of DbContext to use lolita:

protected override void OnConfiguring(                           DbContextOptionsBuilder optionsBuilder){optionsBuilder.UseMySql(         "server=localhost;database=lolita;uid=root;pwd=yourpwd;");optionsBuilder.UseMySqlLolita();    base.OnConfiguring(optionsBuilder);
}

③ There are many different extended methods for updating a column or bulk deleting.

Updating:

db.Posts.Where(x => x.Time <= DateTime.Now).SetField(x => x.IsPinned).WithValue(false).Update();

You can also use the following methods to update a field:

Method	SQL	Hint
WithValue	SET [x] = @value
Plus	SET [x] = [x] + @value	Numeric only
Subtract	SET [x] = [x] - @value	Numeric only
Multiply	SET [x] = [x] * @value	Numeric only
Divide	SET [x] = [x] / @value	Numeric only
Mod	SET [x] = [x] % @value	Numeric only
Prepend	SET [x] = @value + [x]	String only
Append	SET [x] = [x] + @value	String only
AddMilliseconds	SET [x] = DATEADD(ms, @value, [x])	DateTime only
AddSeconds	SET [x] = DATEADD(ss, @value, [x])	DateTime only
AddMinutes	SET [x] = DATEADD(mi, @value, [x])	DateTime only
AddHours	SET [x] = DATEADD(hh, @value, [x])	DateTime only
AddDays	SET [x] = DATEADD(dd, @value, [x])	DateTime only
AddMonths	SET [x] = DATEADD(mm, @value, [x])	DateTime only
AddYears	SET [x] = DATEADD(yy, @value, [x])	DateTime only

Deleting:

db.Users.Where(x => db.Posts.Count(y => y.UserId == x.Id) == 0).Where(x => x.Role == UserRole.Member).Delete();

Contribute

One of the easiest ways to contribute is to participate in discussions and discuss issues. You can also contribute by submitting pull requests with code changes.

License

MIT

全球首发免费的MySql for Entity Framework Core
.NET Core 使用Dapper 操作MySQL
在.NET Core中使用MySQL5.7的JSON类型字段

原文地址：http://www.1234.sh/post/ef-core-lolita

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