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添加新的多表查询语法

hzy
2020-11-04 00:15:07 +08:00
parent f22e29a8d1
commit c2950b4ed1
1 changed files with 8 additions and 0 deletions
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8
多表查询.md

@@ -57,6 +57,14 @@ fsql.Select<Topic>().From<Category, CategoryType>((s, b, c) => s
.LeftJoin(a => b.ParentId == c.Id)) .LeftJoin(a => b.ParentId == c.Id))
.Where((a,b,c) => c.Id > 0) .Where((a,b,c) => c.Id > 0)
.ToList((a,b,c) => new { a,b,c }); .ToList((a,b,c) => new { a,b,c });
//减少定义 a,b,c 写法
fsql.Select<Topic, Category, CategoryType>()
.LeftJoin(w => w.t1.CategoryId == w.t2.Id)
.LeftJoin(w => w.t2.ParentId == w.t3.Id)
.Where(w => w.t3.Id > 0)
.ToList(w => new { w.t1,w.t2,w.t3 });
//SELECT ... //SELECT ...
//FROM `Topic` a //FROM `Topic` a
//LEFT JOIN `Category` b ON a.`CategoryId` = b.`Id` //LEFT JOIN `Category` b ON a.`CategoryId` = b.`Id`