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Update README.md

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sunkaixuan 2019-04-29 15:35:52 +08:00 committed by GitHub
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@ -91,9 +91,9 @@ var totalCount = 0;
var page = db.Queryable<Student>().ToPageList(pageIndex, pageSize, ref totalCount);
//page join
var pageJoin = db.Queryable<Student, School>((st, sc) => new object[] {
var pageJoin = db.Queryable<Student, School>((st, sc) =>new JoinQueryInfos(
JoinType.Left,st.SchoolId==sc.Id
}).ToPageList(pageIndex, pageSize, ref totalCount);
)).ToPageList(pageIndex, pageSize, ref totalCount);
//top 5
var top5 = db.Queryable<Student>().Take(5).ToList();
@ -114,36 +114,34 @@ var list7= db.Queryable<Student, School, School>((st, sc, sc2) => st.SchoolId ==
.Select((st, sc, sc2) => new { st.Name, st.Id, schoolName = sc.Name, schoolName2 = sc2.Name }).ToPageList(1,2);
//join 2
var list = db.Queryable<Student, School>((st, sc) => new object[] {
var list = db.Queryable<Student, School>((st, sc) => new JoinQueryInfos(
JoinType.Left,st.SchoolId==sc.Id
})
))
.Where(st=>st.Name=="jack").ToList();
//join 3
var list2 = db.Queryable<Student, School,Student>((st, sc,st2) => new object[] {
var list2 = db.Queryable<Student, School,Student>((st, sc,st2) => new JoinQueryInfos(
JoinType.Left,st.SchoolId==sc.Id,
JoinType.Left,st.SchoolId==st2.Id
})
))
.Where((st, sc, st2)=> st2.Id==1||sc.Id==1||st.Id==1).ToList();
//join return List<ViewModelStudent>
var list3 = db.Queryable<Student, School>((st, sc) => new object[] {
var list3 = db.Queryable<Student, School>((st, sc) => new JoinQueryInfos(
JoinType.Left,st.SchoolId==sc.Id
}).Select((st,sc)=>new ViewModelStudent { Name= st.Name,SchoolId=sc.Id }).ToList();
)).Select((st,sc)=>new ViewModelStudent { Name= st.Name,SchoolId=sc.Id }).ToList();
//join Order By (order by st.id desc,sc.id desc)
var list4 = db.Queryable<Student, School>((st, sc) => new object[] {
var list4 = db.Queryable<Student, School>((st, sc) =>new JoinQueryInfos(
JoinType.Left,st.SchoolId==sc.Id
})
))
.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();
```
### subquery
```cs
var getAll = db.Queryable<Student, School>((st, sc) => new object[] {
JoinType.Left,st.Id==sc.Id})
var getAll = db.Queryable<Student, School>((st, sc) => new JoinQueryInfos(
JoinType.Left,st.Id==sc.Id))
.Where(st => st.Id == SqlFunc.Subqueryable<School>().Where(s => s.Id == st.Id).Select(s => s.Id))
.ToList();