C# DBhelpMySQL代码 MysqlDBhelp类代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;

namespace LanFilmSystem
{
    class DBHelpMysql
    {
        //数据库链接字符串
        public static string ConnetStr = "server=;port=3306;user=;password=;database=";
        //数据库链接对象
        public static MySqlConnection Conn = new MySqlConnection(ConnetStr);
        // 初始化数据库链接
        public static void InitConnection()
        {
            // 如果链接对象不存在，则打开链接
            if (Conn == null)
            {
                Conn = new MySqlConnection(ConnetStr);
            }
            // 如果链接对象关闭，则打开链接
            if (Conn.State == System.Data.ConnectionState.Closed)
            {
                Conn.Open();
            }
            // 如果链接中断，则重启链接
            if (Conn.State == System.Data.ConnectionState.Broken)
            {
                Conn.Close();
                Conn.Open();
            }

        }
        // 查询，获取DataReader
        public static MySqlDataReader GetDataReader(string SqlStr)
        {
            InitConnection();
            MySqlCommand cmd = new MySqlCommand(SqlStr, Conn);
            // CommandBehavior.CloseConnection 命令行为，当DataReader对象被关闭时，自动关闭
            // 占用的链接对象
            return cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
        }
        // 查询表
        public static MySqlDataAdapter GetAllInfo(string SqlStr)
        {
            InitConnection();
            MySqlCommand cmd = new MySqlCommand(SqlStr, Conn);
            MySqlDataAdapter da = new MySqlDataAdapter(cmd);
            return da;
        }
        //增、删、改操作
        public static bool ExecuteNonQuery(string sqlStr)
        {
            InitConnection();
            MySqlCommand cmd = new MySqlCommand(sqlStr, Conn);
            int result = cmd.ExecuteNonQuery();
            Conn.Close();
            return result > 0;
        }
        // 执行集合函数
        public static object ExecuteScalar(string sqlStr)
        {
            InitConnection();
            MySqlCommand cmd = new MySqlCommand(sqlStr, Conn);
            object result = cmd.ExecuteScalar();
            Conn.Close();
            return result;
        }
    }
}