自己封装的ASP.NET的MYSQL的数据库操作类

/**
 * 作者：牛腩
 * 创建时间：2010年3月7日17时35分
 * 类说明：对MYSQL数据库的操作类
 */
using System;
using System.Data;
using MySql.Data.MySqlClient;


namespace Niunan.BYLW.Utility
{
    /// <summary>对MYSQL数据库的操作类
    ///
    /// </summary>
    public class MYSQLHelper
    {
        private MySqlConnection conn = null;
        private MySqlCommand cmd = null;
        private MySqlDataReader sdr = null;


        public MYSQLHelper()
        {
            //string connStr = WebConfigurationManager.ConnectionStrings["connStr"].ToString();
            string connStr = "server=localhost;database=test;uid=root;pwd=123456;charset=utf8";
            conn = new MySqlConnection(connStr);
        }


        /// <summary>创建Command对象
        ///
        /// </summary>
        /// <param name="sql">SQL语句</param>
        public void CreateCommand(string sql)
        {
            conn.Open();
            cmd = new MySqlCommand(sql, conn);
        }


        /// <summary>添加参数
        ///
        /// </summary>
        /// <param name="paramName">参数名称</param>
        /// <param name="value">值</param>
        public void AddParameter(string paramName, object value)
        {
            cmd.Parameters.Add(new MySqlParameter(paramName, value));
        }


        /// <summary>执行不带参数的增删改SQL语句
        ///
        /// </summary>
        /// <param name="cmdText">增删改SQL语句</param>
        /// <param name="ct">命令类型</param>
        /// <returns></returns>
        public bool ExecuteNonQuery()
        {
            int res;
            try
            {
                res = cmd.ExecuteNonQuery();
                if (res > 0)
                {
                    return true;
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (conn.State == ConnectionState.Open)
                {
                    conn.Close();
                }
            }
            return false;
        }


        /// <summary>执行查询SQL语句
        ///
        /// </summary>
        /// <param name="cmdText">查询SQL语句</param>
        /// <returns></returns>
        public DataTable ExecuteQuery()
        {
            DataTable dt = new DataTable();
            using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
            {
                dt.Load(sdr);
            }
            return dt;
        }


        /// <summary>返回查询SQL语句查询出的结果的第一行第一列的值
        ///
        /// </summary>
        /// <returns></returns>
        public string ExecuteScalar()
        {
            string res = "";
            try
            {
                object obj = cmd.ExecuteScalar();
                if (obj != null)
                {
                    res = obj.ToString();
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (conn.State == ConnectionState.Open)
                {
                    conn.Close();
                }
            }
            return res;
        }


    }
}

都是把那个SQLITEHelper的操作类搬过来的，改了MySqlConnection等变量名，对MYSQL来说经常会出现中文乱码，经实验，解决方法：

① 用PHPMYADMIN建立MYSQL数据库的时候记得选择UTF-8的编码

② 在上面的数据库操作类中的连接字符串中记得加上charset=utf8

这样用上面的操作类来插入中文就不会出现乱码了。