diff --git a/Greed-Loading.md b/Greed-Loading.md index c817f30..776221c 100644 --- a/Greed-Loading.md +++ b/Greed-Loading.md @@ -30,45 +30,45 @@ Select().IncludeMany(a => a.Songs, then => then.Where(song => song.User == "admin")).ToList(); ``` -其实在 then 那里,还可以继续进行向下 Include/IncludeMany。只要你喜欢,向下 100 层都没问题。 +In fact, in `Then`, you can continue to use `Include`/`IncludeMany`. As long as you like it, it’s okay to go down 100 levels. -## 3、变异 +## Mutations -没有配置导航关系,也可以贪婪加载。 +It can also be greedily loaded without configuring the navigation relationship. ```csharp Select().IncludeMany(a => a.TestManys.Where(b => b.TagId == a.Id)); ``` -只查询每项子集合的前几条数据,避免像EfCore加载所有数据导致IO性能低下(比如某商品下有2000条评论)。 +Only query the first few pieces of data in each sub-collection to avoid poor IO performance caused by loading all data like EfCore (for example, there are 2000 comments under a product). ```csharp Select().IncludeMany(a => a.TestManys.Take(10)); ``` -子集合返回部分字段,避免字段过多的问题。 +The sub-collection returns a part of the fields to avoid the problem of too many fields. ```csharp Select().IncludeMany(a => a.TestManys.Select(b => new TestMany { Title = b.Title ... })); ``` -## 4、IncludeMany 扩展方法 +## IncludeMany Extensions -当主数据已存在内存中,子数据怎么加载?所以我们增加了 List\ 扩展方法,示例如下: +When the main data already exists in the memory, how to load the sub-data? So we added the List\ extension method, the example is as follows: ```csharp new List(new[] { song1, song2, song3 }).IncludeMany(fsql, a => a.Tags); ``` -## 5、IncludeMany 两种方式对比 +## Comparison of the Two Ways of IncludeMany -方式一(IncludeMany 扩展方法): +**Way 1: IncludeMany extensions** ```csharp var list111 = fsql.Select() .Page(1, 10) - .ToList(a => new { Id = a.Id }) //查询数据 id - .Select(a => new SysModule { Id = a.Id }).ToList() //内存操作 + .ToList(a => new { Id = a.Id }) //Query data id + .Select(a => new SysModule { Id = a.Id }).ToList() //Memory operation .IncludeMany(fsql, a => a.Permissions, then => then.Include(a => a.Button)); ``` @@ -86,7 +86,7 @@ WHERE ((a."SysModuleId") in ('menu1','menu2')) --- -方式二(直接 IncludeMany + ToList): +**Way 2: Directly IncludeMany + ToList** ```csharp var list222 = fsql.Select() @@ -107,7 +107,7 @@ LEFT JOIN "SysModuleButton" a__Button ON a__Button."Id" = a."SysModuleButtonId" WHERE ((a."SysModuleId") in ('menu1','menu2')) ``` -案例:查询 Vod 表,分类1、分类2、分类3 各10条数据 +Case: Query Vod table, 10 data for each of category 1, category 2, and category 3 ```csharp class Vod { @@ -115,7 +115,7 @@ class Vod { public int TypeId { get; set; } } -//定义临时类,也可以是 Dto 类 +//Define a temporary class, it can also be a DTO class Dto { public int TypeId { get; set; } public List Vods { get; set; } @@ -124,7 +124,7 @@ class Dto { var dto = new [] { 1,2,3 }.Select(a => new Dto { TypeId = a }).ToList(); dto.IncludeMany(fsql, d => d.Vods.Take(10).Where(vod => vod.TypeId == d.TypeId)); -//执行后,dto 每个元素.Vods 将只有 10条记录 +//After execution, each element.Vods of DTO will only have 10 records ``` ## Reference