1. 导出为CSV文件

 /// <summary>/// 将mysql数据保存为csv文件/// </summary>/// <param name="connectionString">数据库连接字符串</param>/// <param name="query">sql语句</param>/// <param name="filePath">文件保存地址</param>/// public static void ExportToCsv(string connectionString, string query, string filePath){using (MySqlConnection conn = new MySqlConnection(connectionString)){using (MySqlCommand cmd = new MySqlCommand(query, conn)){conn.Open();using (MySqlDataReader reader = cmd.ExecuteReader()){using (StreamWriter writer = new StreamWriter(filePath, false, Encoding.UTF8)){// 写入标题  for (int i = 0; i < reader.FieldCount; i++){writer.Write(reader.GetName(i));if (i < reader.FieldCount - 1)writer.Write(",");}writer.WriteLine();// 写入数据  while (reader.Read()){for (int i = 0; i < reader.FieldCount; i++){if (!reader.IsDBNull(i))writer.Write(reader.GetValue(i).ToString().Replace(",", ";")); // 避免逗号冲突  elsewriter.Write("");if (i < reader.FieldCount - 1)writer.Write(",");}writer.WriteLine();}}}}}}

2、导出为xml文件

    /// <summary>/// 将mysql中的数据导出为xml文件/// </summary>/// <param name="connectionString"> 连接字符串</param>/// <param name="query">sql语句</param>/// <param name="filePath">保存csv文件的路径</param>public static void ExportToXml(string connectionString, string query, string filePath){DataSet dataSet = new DataSet();using (MySqlConnection conn = new MySqlConnection(connectionString)){using (MySqlDataAdapter adapter = new MySqlDataAdapter(query, conn)){conn.Open();adapter.Fill(dataSet);// 保存到文件  dataSet.WriteXml(filePath);}}}