完整删除

删除

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

namespace Delete1
{
    class Program
    {
        static void Main(string[] args)
        {
            bool has = false;//默认has  false
            Console.Write("请输入要删除的编号：");
            string ucode = Console.ReadLine();

            //先查询有无此数据
            SqlConnection conn = new SqlConnection("server=.;database=Data0504;user=sa;pwd=123;");
            SqlCommand cmd = conn.CreateCommand();

            cmd.CommandText = "select *from Users where Ucode=@a";
            cmd.Parameters.Clear();
            cmd.Parameters.AddWithValue("@a", ucode);

            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if (dr.HasRows)//如果查到数据让has=true
            {
                has = true;
            }
            conn.Close();

            if (has)//如果has=true删除成功
            {
                //执行删除
                Console.WriteLine("删除成功！");
            }
            else
            {
                Console.WriteLine("未查到此编号数据，请确定编号是否正确！");
            }





            Console.ReadLine();
        }
    }
}