(精华)2020年8月22日 ABP vNext 定制Repository
前一节我们看到了使用缺省Repository的局限性。解决这种局限性有两种办法，一种是在Application层引入EF，这样可以在ApplicationService中使用EF的扩展，如Include等，弥补通用Repository的不足。还有一种办法是编写定制的Repository。我们不希望应用层依赖特定的数据库框架（不远的将来我们会把数据移动到MongoDb），所以我们采用第二种办法。
定制Repository需要两部分代码：在领域层的Repository接口和在特定数据访问层种的实现。我们需要定义两个定制的Repository:ICategoryPoemRepository和IPoemRepository，这两个接口在ZL.AbpNext.Poem.Core项目Repositories目录下：
using System;
using System.Collections.Generic;
using System.Text;
using Volo.Abp.Domain.Repositories;
using ZL.AbpNext.Poem.Core.Poems;
namespace ZL.AbpNext.Poem.Core.Repositories
{
public interface ICategoryPoemRepository : IRepository<CategoryPoem, int>
{
List<Category> GetPoemCategories(int poemid);
List<Core.Poems.Poem> GetPoemsOfCategory(int categoryid);
}
}
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using Volo.Abp.Domain.Repositories;
namespace ZL.AbpNext.Poem.Core.Repositories
{
public interface IPoemRepository : IRepository<Core.Poems.Poem , int>
{
Task<List<Core.Poems.Poem>> GetPagedPoems(int maxResult,int skip,string author,string keyword,string[] categories,out int total);
}
}
对应的实现在ZL.AbpNext.Poem.EF项目中：
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Volo.Abp.Domain.Repositories.EntityFrameworkCore;
using Volo.Abp.EntityFrameworkCore;
using ZL.AbpNext.Poem.Core.Poems;
using ZL.AbpNext.Poem.Core.Repositories;
using ZL.AbpNext.Poem.EF.EntityFramework;
namespace ZL.AbpNext.Poem.EF.Repositories
{
public class CategoryPoemRepository : EfCoreRepository<PoemDbContext, CategoryPoem, int>, ICategoryPoemRepository
{
public CategoryPoemRepository(IDbContextProvider<PoemDbContext> dbContextProvider)
: base(dbContextProvider)
{
}
public List<Category> GetPoemCategories(int poemid)
{
var set = DbContext.Set<CategoryPoem>().Include(o => o.Category).AsQueryable();
var lst = set.Where(p => p.PoemId == poemid).Select(o => o.Category);
return lst.ToList();
}
public List<Core.Poems.Poem> GetPoemsOfCategory(int categoryid)
{
var set = DbContext.Set<CategoryPoem>().Include(o => o.Poem).AsQueryable();
var lst = set.Where(p => p.CategoryId == categoryid).Select(o=>o.Poem);
return lst.ToList();
}
}
}
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Volo.Abp.Domain.Repositories.EntityFrameworkCore;
using Volo.Abp.EntityFrameworkCore;
using ZL.AbpNext.Poem.Core.Repositories;
using ZL.AbpNext.Poem.EF.EntityFramework;
namespace ZL.AbpNext.Poem.EF.Repositories
{
public class PoemRepository : EfCoreRepository<PoemDbContext, Core.Poems.Poem, int>, IPoemRepository
{
public PoemRepository(IDbContextProvider<PoemDbContext> dbContextProvider)
: base(dbContextProvider)
{
}
public Task<List<Core.Poems.Poem>> GetPagedPoems(int maxResult, int skip, string author, string keyword, string[] categories, out int total)
{
var set=DbContext.Set<Core.Poems.Poem>().Include(o=>o.Author).Include(o=>o.PoemCategories).AsQueryable();
if (!string.IsNullOrEmpty(author))
{
set = set.Where(o => o.Author.Name == author);
}
if (!string.IsNullOrEmpty(keyword))
{
set = set.Where(o => o.Title.Contains(keyword) );
}
if (categories != null && categories.Length > 0)
{
foreach (var category in categories)
{
set = set.Where(o => o.PoemCategories.Any(q => q.Category.CategoryName == category));
}
}
total = set.Count();
var lst = set.OrderBy(o => o.Id).PageBy(skip,maxResult).ToListAsync();
return lst;
}
}
}
完整的PoemAppService如下：
using System.Collections.Generic;
using System.Linq;
using Volo.Abp.Application.Dtos;
using Volo.Abp.Application.Services;
using Volo.Abp.Domain.Repositories;
using ZL.AbpNext.Poem.Core.Poems;
using ZL.AbpNext.Poem.Core.Repositories;
namespace ZL.AbpNext.Poem.Application.Poems
{
public class PoemAppService : ApplicationService, IPoemAppService
{
private readonly IPoemRepository _poemRepository;
private readonly IRepository<Category> _categoryRepository;
private readonly IRepository<Poet> _poetRepository;
private readonly ICategoryPoemRepository _categoryPoemRepository;
public PoemAppService(IPoemRepository poemRepository
, IRepository<Category> categoryRepository
, IRepository<Poet> poetRepository
, ICategoryPoemRepository categoryPoemRepository)
{
_poemRepository = poemRepository;
_categoryRepository = categoryRepository;
_poetRepository = poetRepository;
_categoryPoemRepository = categoryPoemRepository;
}
public CategoryDto AddCategory(CategoryDto category)
{
var cate = _categoryRepository.FirstOrDefault(o => o.CategoryName == category.CategoryName);
if (cate == null)
{
cate= _categoryRepository.InsertAsync(new Category {
CategoryName = category.CategoryName },true).Result;
}
return ObjectMapper.Map<Category,CategoryDto>(cate);
}
public void AddPoemToCategory(CategoryPoemDto categoryPoem)
{
var categorypoem = _categoryPoemRepository.FirstOrDefault(o => o.CategoryId == categoryPoem.CategoryId && o.PoemId == categoryPoem.PoemId);
if (categorypoem == null)
{
categorypoem = new CategoryPoem {
CategoryId = categoryPoem.CategoryId, PoemId = categoryPoem.PoemId };
_categoryPoemRepository.InsertAsync(categorypoem,true);
}
}
public PoetDto AddPoet(PoetDto poet)
{
var addpoet=_poetRepository.InsertAsync(new Poet
{
Name=poet.Name,
Description=poet.Description
},true).Result;
return new PoetDto
{
Id=addpoet.Id,
Name=addpoet.Name,
Description=addpoet.Description
};
}
public void DeleteCategory(CategoryDto category)
{
if (category.Id > 0)
{
var cat = _categoryRepository.FirstOrDefault(o => o.Id == category.Id);
if (cat != null)
{
_categoryRepository.DeleteAsync(cat, true);
}
}
else if (!string.IsNullOrEmpty(category.CategoryName))
{
var cat = _categoryRepository.FirstOrDefault(o => o.CategoryName == category.CategoryName);
if (cat != null)
{
_categoryRepository.DeleteAsync(cat,true);
}
}
}
public List<CategoryDto> GetAllCategories()
{
return ObjectMapper.Map<List<Category>, List<CategoryDto>>(_categoryRepository.ToList());
}
public List<CategoryPoemDto> GetCategoryPoems()
{
return ObjectMapper.Map<List<CategoryPoem>, List<CategoryPoemDto>>(_categoryPoemRepository.ToList());
}
public PagedResultDto<PoemDto> GetPagedPoems(PagedResultRequestDto dto)
{
var count = _poemRepository.Count();
var lst = _poemRepository.OrderBy(o => o.Id).PageBy(dto).ToList();
return new PagedResultDto<PoemDto>
{
TotalCount = count,
Items = ObjectMapper.Map<List<Core.Poems.Poem>, List<PoemDto>>(lst) //lst.MapTo>()
};
}
public PagedResultDto<PoetDto> GetPagedPoets(PagedResultRequestDto dto)
{
var count = _poetRepository.Count();
var lst = _poetRepository.OrderBy(o => o.Id).PageBy(dto).ToList();
var items = new List<PoetDto>();
return new PagedResultDto<PoetDto>
{
TotalCount = count,
Items = ObjectMapper.Map<List<Poet>, List<PoetDto>>(lst)
};
}
public List<CategoryDto> GetPoemCategories(int poemid)
{
var lst = _categoryPoemRepository.GetPoemCategories(poemid);
return ObjectMapper.Map<List<Category>, List<CategoryDto>>(lst);
}
public List<PoemDto> GetPoemsOfCategory(int categoryid)
{
var lst = _categoryPoemRepository.GetPoemsOfCategory(categoryid);
return ObjectMapper.Map<List<Core.Poems.Poem>, List<PoemDto>>(lst);
}
public void RemovePoemFromCategory(CategoryPoemDto categoryPoem)
{
var categorypoem = _categoryPoemRepository.FirstOrDefault(o => o.CategoryId == categoryPoem.CategoryId && o.PoemId == categoryPoem.PoemId);
if (categorypoem != null)
{
_categoryPoemRepository.DeleteAsync(categorypoem,true);
}
}
public PagedResultDto<PoemDto> SearchPoems(SearchPoemDto dto)
{
int total;
var lst = _poemRepository.GetPagedPoems(dto.MaxResultCount, dto.SkipCount, dto.AuthorName, dto.Keyword,dto.Categories, out total).Result;
return new PagedResultDto<PoemDto> {
TotalCount = total,
Items=ObjectMapper.Map<List<Core.Poems.Poem>, List<PoemDto>>(lst)
};
}
public PagedResultDto<PoetDto> SearchPoets(SearchPoetDto dto)
{
var res = _poetRepository.AsQueryable();
if (!string.IsNullOrEmpty(dto.Keyword))
{
res = res.Where(o => o.Name.Contains(dto.Keyword));
}
var count = res.Count();
var lst = res.OrderBy(o => o.Id).PageBy(dto).ToList();
return new PagedResultDto<PoetDto>
{
TotalCount = count,
Items = ObjectMapper.Map< List < Poet> ,List <PoetDto>>(lst)
};
}
}
}