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(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

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

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