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Query optimization

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sunkaixuan
2017-06-16 02:21:29 +08:00
parent d3497faa69
commit 588bce0b5c
7 changed files with 141 additions and 19 deletions
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11
SqlServerTest/Demos/1_Query.cs
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@@ -228,6 +228,17 @@ namespace OrmTest.Demo
.OrderBy(st => st.Id, OrderByType.Desc)
.OrderBy((st, sc) => sc.Id, OrderByType.Desc)
.Select((st, sc) => new ViewModelStudent { Name = st.Name, SchoolId = sc.Id }).ToList();
//The simple use of Join 2 table
var list5 = db.Queryable<Student, School>((st, sc) => st.SchoolId == sc.Id).Select((st,sc)=>new {st.Name,st.Id,schoolName=sc.Name}).ToList();
//join 3 table
var list6 = db.Queryable<Student, School,School>((st, sc,sc2) => st.SchoolId == sc.Id&&sc.Id==sc2.Id)
.Select((st, sc,sc2) => new { st.Name, st.Id, schoolName = sc.Name,schoolName2=sc2.Name }).ToList();
//join 3 table page
var list7= db.Queryable<Student, School, School>((st, sc, sc2) => st.SchoolId == sc.Id && sc.Id == sc2.Id)
.Select((st, sc, sc2) => new { st.Name, st.Id, schoolName = sc.Name, schoolName2 = sc2.Name }).ToPageList(1,2);
}
public static void Funs()
{