6098-5/Cowain.Preheat.BLL/ServiceBase.cs

using Cowain.Preheat.Model;
using MySql.Data.MySqlClient;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Linq.Expressions;
using Unity;

namespace Cowain.Preheat.BLL
{
    public class ServiceBase
    {
        public readonly object _lockObj = new object();
        //protected DbContext Context { get; private set; }
        protected IUnityContainer _unityContainer;
        public ServiceBase(IUnityContainer unityContainer)
        {
           //Context = new PreheatEntities();
            _unityContainer = unityContainer;
        }
        //public int  Commit()
        //{
        //    return this.Context.SaveChanges();        
        //}

        public int Delete<T>(int Id) where T : class
        {
            using (var Context = new PreheatEntities())
            {
                T t = Context.Set<T>().Find(Id);//也可以附加
                if (t == null) throw new Exception("t is null");
                Context.Set<T>().Remove(t);
                return Context.SaveChanges();
            }
        }

        public int Delete<T>(T t) where T : class
        {
            using (var Context = new PreheatEntities())
            {
                if (t == null) throw new Exception("t is null");
                Context.Set<T>().Attach(t);
                Context.Set<T>().Remove(t);
                return Context.SaveChanges();
            }          
        }

        public void Delete<T>(IEnumerable<T> tList) where T : class
        {
            using (var Context = new PreheatEntities())
            {
                foreach (var t in tList)
                {
                    Context.Set<T>().Attach(t);
                }
                Context.Set<T>().RemoveRange(tList);
                Context.SaveChanges();
            }       
        }

        public List<T> Find<T>() where T : class
        {
            using (var Context = new PreheatEntities())
            {
                return Context.Set<T>().ToList();
            }            
        }
        public T Find<T>(int id) where T : class
        {
            using (var Context = new PreheatEntities())
            {
                return Context.Set<T>().Find(id);
            }
        }

        public int Insert<T>(T t) where T : class
        {
            using (var Context = new PreheatEntities())
            {
                Context.Set<T>().Add(t);
                return Context.SaveChanges();
            }        
        }

        public int Insert<T>(IEnumerable<T> tList) where T : class
        {
            using (var Context = new PreheatEntities())
            {
                Context.Set<T>().AddRange(tList);
                return Context.SaveChanges();//写在这里  就不需要单独commit  不写就需要 
            }
        }

        public IQueryable<T> Query<T>(Expression<Func<T, bool>> funcWhere) where T : class
        {
            using (var Context = new PreheatEntities())
            {
                return Context.Set<T>().Where<T>(funcWhere);
            }
        }

        public int Update<T>(T t) where T : class
        {
            using (var Context = new PreheatEntities())
            {
                if (t == null) throw new Exception("t is null");
                Context.Set<T>().Attach(t);//将数据附加到上下文，支持实体修改和新实体，重置为UnChanged
                Context.Entry<T>(t).State = EntityState.Modified;
                return Context.SaveChanges();
            }

        }

        public bool Update<T>(IEnumerable<T> tList) where T : class
        {
            using (var Context = new PreheatEntities())
            {
                foreach (var t in tList)
                {
                    Context.Set<T>().Attach(t);
                    Context.Entry<T>(t).State = EntityState.Modified;
                }
                return Context.SaveChanges()> 0 ? true : false;
            }
           
        }
        public int UpdateListParas<T>(IEnumerable<T> tList) where T : class
        {
            using (var Context = new PreheatEntities())
            {
                foreach (var t in tList)
                {
                    Context.Set<T>().Attach(t);
                    Context.Entry<T>(t).State = EntityState.Modified;
                }
                return Context.SaveChanges();
            }
            
        }
        public virtual void Dispose()
        {
            //if (this.Context != null)
            //{
            //    this.Context.Dispose();
            //}
        }
        public int ExecuteNonQuery(string sql)
        {
            using (var Context = new PreheatEntities())
            {
                return Context.Database.ExecuteSqlCommand(sql);
            }
        }
        public DataTable GetDataTable(string sql)
        {
            lock(_lockObj)
            {
                using (var Context = new PreheatEntities())
                {
                    MySqlConnection conn = new MySqlConnection();
                    conn.ConnectionString = Context.Database.Connection.ConnectionString;
                    if (conn.State != ConnectionState.Open)
                    {
                        conn.Open();
                    }
                    MySqlCommand cmd = new MySqlCommand();
                    cmd.Connection = conn;
                    cmd.CommandText = sql;

                    MySqlDataAdapter adapter = new MySqlDataAdapter(cmd);
                    DataTable table = new DataTable();
                    adapter.Fill(table);

                    conn.Close();//连接需要关闭
                    conn.Dispose();
                    return table;
                }                 
            }
           
        }
    }
}