ADO

 

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

namespace ConsoleApp2
{
    public static class SqlHelper
    {
        private static readonly string constr = ConfigurationManager.ConnectionStrings["mysql"].ConnectionString;

        public static int ExecuteNonQuery(string sqlStr, CommandType commandType, params SqlParameter[] pms)
        {
            using (SqlConnection con = new SqlConnection(constr))
            {
                using (SqlCommand cmd = new SqlCommand(sqlStr, con))
                {
                    cmd.CommandType = commandType;
                    if (pms != null)
                        cmd.Parameters.AddRange(pms);

                    con.Open();
                    object a= cmd.ExecuteNonQuery();
                    return 0;
                }
            }
        }

        public static object ExecuteScalar(string sqlStr, CommandType commandType, params SqlParameter[] pms)
        {
            using (SqlConnection con = new SqlConnection(constr))
            {
                using (SqlCommand cmd = new SqlCommand(sqlStr, con))
                {
                    cmd.CommandType = commandType;
                    if (pms != null)
                    {
                        cmd.Parameters.Clear();
                        cmd.Parameters.AddRange(pms);
                    }
                    con.Open();
                    return cmd.ExecuteScalar();
                }
            }

        }


        public static SqlDataReader ExecuteReader(string sqlStr, CommandType commandType, params SqlParameter[] pms)
        {
            SqlConnection con = new SqlConnection(constr);
            using (SqlCommand cmd = new SqlCommand(sqlStr, con))
            {
                cmd.CommandType = commandType;
                if (pms != null)
                {
                    cmd.Parameters.Clear();
                    cmd.Parameters.AddRange(pms);
                }
                try
                {
                    if (con.State == ConnectionState.Closed)
                        con.Open();
                    return cmd.ExecuteReader(CommandBehavior.CloseConnection);
                }
                catch (Exception)
                {
                    if (con.State == ConnectionState.Open)
                    {
                        con.Close();
                        con.Dispose();
                    }
                    throw;
                }
            }
        }

        public static DataTable ExecuteTable(string sqlStr, CommandType commandType, params SqlParameter[] pms)
        {
            DataTable table = new DataTable();
            using (SqlConnection con = new SqlConnection(constr))
            {
                using (SqlDataAdapter adapt = new SqlDataAdapter(sqlStr, con))
                {
                    adapt.SelectCommand.CommandType = commandType;
                    if (pms != null)
                    {
                        adapt.SelectCommand.Parameters.Clear();
                        adapt.SelectCommand.Parameters.AddRange(pms);
                    }
                    con.Open();
                    adapt.Fill(table);
                }
            }
            return table;
        }


    }
}

 

  private static void Insert()
        {
            List<string> list = new List<string>();

            List<SqlParameter> pms = new List<SqlParameter>();
            for (int i = 101; i < 1101; i++)
            {
                string name = "name" + i;
                string pwd = "pwd" + i;
                string str = $"('@{name}','@{pwd}')";
                pms.Add(new SqlParameter($"@{name}",$"@{pwd}"));
                list.Add(str);
            }
            string sqlStr = $"insert into LoginData values {string.Join(",", list)}";
            int ii = SqlHelper.ExecuteNonQuery(sqlStr, System.Data.CommandType.Text,pms.ToArray());
            Console.WriteLine(ii);
        }

        private void Select()
        {
            Console.WriteLine("name:");
            string name = Console.ReadLine();
            Console.WriteLine("密码：");
            string pwd = Console.ReadLine();

            string sqlStr = "select count(0) from LoginData where name=@name and password=@pwd";
            List<SqlParameter> pms = new List<SqlParameter>()
            {
                new SqlParameter("@name",name),
                new SqlParameter("@pwd",pwd)
            };
            object num = SqlHelper.ExecuteScalar(sqlStr, CommandType.Text, pms.ToArray());
            Console.WriteLine(num);
        }