93 lines
2.8 KiB
C#
93 lines
2.8 KiB
C#
using CC.Yi.IDAL;
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using CC.Yi.Model;
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using Microsoft.EntityFrameworkCore;
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using System;
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using System.Linq;
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using System.Linq.Expressions;
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namespace CC.Yi.DAL
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{
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public class BaseDal<T> : IBaseDal<T> where T : class, new()
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{
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public DataContext Db;
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public BaseDal(DataContext _Db)
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{
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Db = _Db;
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}
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public IQueryable<T> GetEntities(Expression<Func<T, bool>> whereLambda)
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{
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return Db.Set<T>().Where(whereLambda).AsQueryable();
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}
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public IQueryable<T> GetAllEntities()
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{
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return Db.Set<T>().AsQueryable();
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}
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public int GetCount(Expression<Func<T, bool>> whereLambda)
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{
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return Db.Set<T>().Where(whereLambda).Count();
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}
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public IQueryable<IGrouping<S, T>> GetGroup<S>(Expression<Func<T, bool>> whereLambda, Expression<Func<T, S>> groupByLambda) //分组
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{
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return Db.Set<T>().Where(whereLambda).GroupBy<T, S>(groupByLambda).AsQueryable();
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}
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public IQueryable<T> GetPageEntities<S>(int pageSize, int pageIndex, out int total, Expression<Func<T, bool>> whereLambda, Expression<Func<T, S>> orderByLambda, bool isAsc)
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{
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total = Db.Set<T>().Where(whereLambda).Count();
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if (isAsc)
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{
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var pageData = Db.Set<T>().Where(whereLambda)
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.OrderBy<T, S>(orderByLambda)
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.Skip(pageSize * (pageIndex - 1))
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.Take(pageSize).AsQueryable();
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return pageData;
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}
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else
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{
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var pageData = Db.Set<T>().Where(whereLambda)
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.OrderByDescending<T, S>(orderByLambda)
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.Skip(pageSize * (pageIndex - 1))
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.Take(pageSize).AsQueryable();
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return pageData;
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}
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}
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public T Add(T entity)
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{
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Db.Set<T>().Add(entity);
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//Db.SaveChanges();
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return entity;
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}
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public bool Update(T entity)
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{
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//所有字段均修改
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Db.Entry<T>(entity).State = EntityState.Modified;
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//return Db.SaveChanges() > 0;
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return true;
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}
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public bool Delete(T entity)
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{
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Db.Entry<T>(entity).State = EntityState.Deleted;
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//return Db.SaveChanges() > 0;
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return true;
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}
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public bool Detete(int id)
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{
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var entity = Db.Set<T>().Find(id);//根据id找到实体
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Db.Set<T>().Remove(entity);//由于这里先Find找到了实体，所以这里可以用Remove标记该实体要移除（删除）。如果不是先Find到实体就需要用System.Data.Entity.EntityState.Deleted
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return true;
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}
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}
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}
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