DAL/ClassService.cs

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using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Model;

namespace DAL
{
    public class ClassService
    {
        //条件模糊查询-同时查询
        public static List<banji> getList(banji ban)
        {
            string sql = $"select * from Classinfo where ClassName like '%{ban.ClassName}%' or ClassCode='{ban.ClassCode}'";
            SqlDataReader dr = DBHelper.getData(sql);

            List<banji> list = new List<banji>();
            banji obj = null;
            while (dr.Read())
            {
                obj = new banji()
                {
                    ClassID = dr.GetInt32(0),
                    ClassName = dr.GetString(1),
                    ClassCode = dr.GetInt32(2)
                };
                list.Add(obj);
            }
            dr.Close();
            return list;
        }
        //条件查询-班级名字
        public static List<banji> getClassName(banji ban)
        {
            string sql = $"select * from Classinfo where ClassName like '%{ban.ClassName}%'";
            SqlDataReader dr = DBHelper.getData(sql);

            List<banji> list = new List<banji>();
            banji obj = null;
            while (dr.Read())
            {
                obj = new banji()
                {
                    ClassID = dr.GetInt32(0),
                    ClassName = dr.GetString(1),
                    ClassCode = dr.GetInt32(2)
                };
                list.Add(obj);
            }
            dr.Close();
            return list;
        }
        //条件查询-班级编码
        public static List<banji> getClassCode(banji ban)
        {
            string sql = $"select * from Classinfo where ClassCode='{ban.ClassCode}'";
            SqlDataReader dr = DBHelper.getData(sql);