CustomService如何用DBHelper

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using LyqModels;
using System.Data.SqlClient;
using System.Data.Common;
using System.Data;

namespace LyqDAL
{
   public class CustomService
    {
       public static bool Add( Custom custom)
       {
           string sql = "INSERT INTO custom (id, cname, departID, age, ename, password) VALUES (@id, @cname, @departID, @age, @ename, @password) ";
           Dictionary<string, object> dic = new Dictionary<string, object>();
           dic.Add("@id", custom.id);
           dic.Add("@cname", custom.cname);
           dic.Add("@departID", custom.departID);
           dic.Add("@age", custom.age);
           dic.Add("@ename", custom.ename);
           dic.Add("@password", custom.password);
           return DBHelper.ExecuteNonQuery(sql, dic) > 0 ? true : false;


       }
       public static bool Delete(int id)
       {

           string sql = " DELETE FROM custom WHERE id = @id ";
           Dictionary<string, object> dic = new Dictionary<string, object>();
           dic.Add("@id", id);

           return DBHelper.ExecuteNonQuery(sql, dic) > 0 ? true : false;
       }
       public static bool Modify(Custom custom )
       {
           string sql = "UPDATE custom SET cname = @cname, departID = @departID, age = @age, ename = @ename, password = @password WHERE id = @id; ";
           Dictionary<string, object> dic = new Dictionary<string, object>();
           dic.Add("@id", custom.id);
           dic.Add("@cname", custom.cname);
           dic.Add("@departID", custom.departID);
           dic.Add("@age", custom.age);
           dic.Add("@ename", custom.ename);
           dic.Add("@password", custom.password);
           return DBHelper.ExecuteNonQuery(sql, dic) > 0 ? true : false;
       }
       public static List<Custom> GetAllCustom()
       {
           string sql ="select * from custom";
           DataTable dt = DBHelper.GetDataSet(sql);
           List<Custom> list = new List<Custom>();
           foreach (DataRow dr in dt.Rows)
           {
               Custom  custom= new Custom();
               custom.id = (int)dr["id"];
               custom.cname = (string)dr["cname"];
               custom.ename = (string)dr["ename"];
               custom.age = (int)dr["age"];
               custom.departID = (int)dr["departID"];
               custom.password = (string)dr["password"];
               list.Add(custom);

           }
           return list;




       }
       public static List<Custom> GetCustom(int id,string cname,string ename,int departID,int age,string password)
       {


           string sql = "SELECT * FROM custom WHERE 1=1";

           if (departID>-1)
           {
                sql += "and departID=@departID";

               if (id > 0)
               {
                   sql += " or id=@id";

               }

               else if (!Equals(cname, ""))
              {
                  sql += " or cname like '%'+@cname+'%'";

              }
               else if (age>0)
              {
               sql += " or age=@age";
              }

               else if (!Equals(ename, ""))
              {
                   sql += " or ename like '%'+@ename+'%'";

              }
              else if (!Equals(password, ""))
              {
                   sql += " or password like '%'+@password+'%'";

              }
           }


           SqlParameter[] arr = new SqlParameter[]
           {
               new SqlParameter("@id", id),
               new SqlParameter("@cname", cname),
               new SqlParameter("@departID", departID),
               new SqlParameter("@age", age),
               new SqlParameter("@ename", ename),
               new SqlParameter("@password", password),

           };

           DataTable dt = DBHelper.GetDataTable(sql, arr);
           List<Custom> list = new List<Custom>();
           foreach (DataRow dr in dt.Rows)
           {
               Custom custom= new Custom();
               custom.id = (int)dr["id"];
               custom.cname = (string)dr["cname"];
               custom.departID = (int)dr["departID"];
               custom.age = (int)dr["age"];
               custom.ename = (string)dr["ename"];
               custom.password = (string)dr["password"];

               list.Add(custom);

           }
           return list;

       }
    }
}