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README
Apache-2.0

Fur.ExtensionPack

Build status Nuget (with prereleases)

介绍

针对Fur基础功能的实用拓展包

安装教程

  1. nuget Install-Package Fur.ExtensionPack

使用说明

1. 审计

对于大部分实体,都需要记录实体进入数据库的相关时间,以及操作人员等,目前此扩展包支持实体创建时间和修改时间的自动管理。

使用

将数据库上下文由继承于AppDbContext更改为继承于AuditingDbContext

    [AppDbContext("Sqlite3ConnectionString")]
    public class FurDbContext : AuditingDbContext<FurDbContext>//<=AppDbContext<FurDbContext>
    {
        public FurDbContext(DbContextOptions<FurDbContext> options) : base(options)
        {

        }
        protected override void SavingChangesEvent(object sender, SavingChangesEventArgs e)
        {

        }

    }

然后,在需要自动管理时间的实体添加ICreationTime以及IUpdateTime接口

 public class Person : Entity,ICreationTime,IUpdateTime
    {
        /// <summary>
        /// 构造函数
        /// </summary>
        public Person()
        {
            //此行已经不需要,由系统自动管理
            CreatedTime = DateTime.Now;
            IsDeleted = false;
        }

        /// <summary>
        /// 姓名
        /// </summary>
        [MaxLength(32)]
        public string Name { get; set; }
        。。。
    }

这样就完成了,此实体新建的时候,将会自动更新创建时间,被更新的时候,写入更新时间,以及在更新的时候,防止创建时间被篡改。

2.修正Mapster的行为

Fur使用Mapster作为Map工具,这是一个非常强大且性能不错的库,然后此库有一些小瑕疵,当子实体列表一并被map作为更新的时候,Mapster是先清空列表,然后再插入列表,这样做是正常的,但是对于EF,它会认为这个子实体被完全修改了,从而为每个子实体生成了全量更新的Sql语句,这对于大型复杂实体来说,对性能的影响是致命性的。要解决这个问题的关键,是让Mapster知道,实体的哪个字段作为主键,并且根据主键去查找对应关系,应此本扩展包提供了一个AdaptToTrack拓展方法能够很方便地进行调用。此功能参考了Mapster.EFCore的实现思路。

public async Task Update(PersonInputDto input)
{
  var person = await _personRepository.Entities.Include(u => u.PersonDetail).Include(u => u.Childrens).Include(u => u.Posts).SingleAsync(u => u.Id == input.Id.Value);
//直接Adapt,会清空Children列表然后插入,EF将会捕捉到所有Children被更新
// input.Adapt(person);
//AdaptToTrack会检测Children的主键(Id)的对应关系,来进行Map,EF只会捕捉到被修改过的更新
   input.AdaptToTrack(person);
   await _personRepository.UpdateAsync(person);

}

3.通用Crud接口

只要将对应接口类继承于CurdService,就可能轻松实现增删改查

    public class StudentService : CrudService<StudentDto, Student>, IDynamicApiController
    {

    }

CurdService所有方法都是虚方法,您可以随意覆写,并且包含了一些配置可以设置:
IsFakeDelete:是否为软删除,告诉Delete接口,删除是软删除还是硬删除,默认值根据传入的实体是否带有[FakeDelete]特性来判断。
IsCalculateCount:调用List接口的时候,是否统计查找到结果数,由于此操作会调用Count来计算,因此可能会延长返回时间,默认为True。
除了CreateAsync,UpdateAsync,Find,List,DeleteAsync的方法覆写外,还支持以下方法覆写:
CreateFilterQuery:此接口时用于生成Where表达式用的,默认使用的是System.Linq.Dynamic.Core,你也可以改成你自己的实现。
CreateEntityQuery:在Update和Get方法的时候,对实体Query进行额外的操作,比如添加Include,Join等操作,请注意传入的Query参数已经添加了Where的筛选条件,应此对应复杂的Include需要Load来分段加载也不用担心性能。
CreateListQuery:在使用List方法的时候,对实体Query进行额外的操作,比如添加Include,Join等操作,请注意传入的Query参数已经添加了Where的筛选条件,应此对应复杂的Include需要Load来分段加载也不用担心性能。

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