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64 lines
2.0 KiB
64 lines
2.0 KiB
using OrmTest.Models;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace OrmTest.Demo
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{
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public class Mapper : DemoBase
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{
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public static void Init()
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{
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var db = GetInstance();
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//auto fill ViewModelStudent3
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var s11 = db.Queryable<Student, School>((st, sc) => st.SchoolId == sc.Id)
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.Select<ViewModelStudent3>().ToList();
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var s12 = db.Queryable<Student, School>((st, sc) => st.SchoolId == sc.Id).Select<ViewModelStudent3>()
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.Mapper((it, cache) =>
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{
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var allSchools = cache.GetListByPrimaryKeys<School>(vmodel => vmodel.SchoolId);
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//sql select shool where id (in（ViewModelStudent3[0].SchoolId , ViewModelStudent3[1].SchoolId...）
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//Equal to allSchools
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//var allSchools2= cache.Get(list =>
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// {
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// var ids=list.Select(i => it.SchoolId).ToList();
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// return db.Queryable<School>().In(ids).ToList();
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//});Complex writing metho
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/*one to one*/
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//Good performance
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it.School = allSchools.FirstOrDefault(i => i.Id == it.SchoolId);
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//Poor performance.
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//it.School = db.Queryable<School>().InSingle(it.SchoolId);
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/*one to many*/
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it.Schools = allSchools.Where(i => i.Id == it.SchoolId).ToList();
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/*C# syntax conversion*/
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it.Name = it.Name == null ? "null" : it.Name;
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}).ToList();
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var s13 = db.Queryable<Student, School>((st, sc) => st.SchoolId == sc.Id).Select<ViewModelStudent3>()
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.Mapper((it, cache) =>
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{
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it.Schools = db.Queryable<School>().Where(i => i.Id == it.SchoolId).ToList();
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}).ToList();
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}
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}
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}
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