DAL/StudentService.cs

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

namespace DAL
{
    public class StudentService
    {
        
        //查重
        public static student getName(int StudentNum)
        {
            string sql = $"select * from Studentinfo where StudentNum='{StudentNum}'";
            SqlDataReader dr = DBHelper.getData(sql);
            student stu = null;
            while (dr.Read())
            {
                stu = new student()
                {
                    StudentID = dr.GetInt32(0),
                    StudentNum = dr.GetInt32(1),
                    StudentName = dr.GetString(2),
                    StudentSex = dr.GetString(3),
                    StudentClass = dr.GetString(4)
                };
            }
            dr.Close();
            return stu;
        }
        //添加
        public static bool Insert(student stu)
        {
            string sql = string.Format("INSERT INTO [dbo].[Studentinfo]([StudentNum] ,[StudentName],[StudentSex],[StudentClass],[StudentPwd]) VALUES('{0}', '{1}','{2}','{3}','{4}')", stu.StudentNum,stu.StudentName,stu.StudentSex,stu.StudentClass,stu.userPwd);
            return DBHelper.updateData(sql);
        }
        //更新
        public static bool updata(student stu)
        {
            string sql = $"UPDATE [dbo].[Studentinfo] SET [StudentNum] = '{stu.StudentNum}',[StudentName] ='{stu.StudentName}',[StudentSex] ='{stu.StudentSex}',[StudentClass] ='{stu.StudentClass}' where StudentID='{stu.StudentID}'";
            return DBHelper.updateData(sql);
        }
        //删除
        public static bool Delete(int id)
        {
            string sql = $"DELETE FROM [dbo].[Studentinfo] WHERE StudentID='{id}'";
            return DBHelper.updateData(sql);
        }
        //条件模糊查询-学号或学生班级
        public static List<student> getList(student stu)
        {
            string sql = $"SELECT [StudentID],[StudentNum],[StudentName],[StudentSex],[StudentClass] FROM [dbo].[Studentinfo] where StudentNum='{stu.StudentNum}'or StudentClass like '%{stu.StudentClass}%'";
            SqlDataReader dr = DBHelper.getData(sql);

            List<student> list = new List<student>();
            student obj = null;
            while (dr.Read())