.NET 使用 MySql.Data.dll 动态库操作MySql的帮助类--MySqlHelper

.NET 使用 MySql.Data.dll 动态库操作MySql的帮助类--MySqlHelper

參考演示样例代码，例如以下所看到的：

/// <summary>
	/// MySql 数据库操作类
	/// </summary>
	public class MySqlHelper
	{
		/// <summary>
		/// MysqlConnection
		/// </summary>
		private static MySql.Data.MySqlClient.MySqlConnection MysqlConnection;

		/// <summary>
		/// 获MySql 连接置信息
		/// </summary>
		/// <returns></returns>
		public static MySql.Data.MySqlClient.MySqlConnection GetCon()
		{
			String mysqlConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["Libor_MySql_QuoteCenter_ConnectionString"].ToString();

			if (MysqlConnection == null)
				using (MysqlConnection = new MySql.Data.MySqlClient.MySqlConnection(mysqlConnectionString)) { };

			if (MysqlConnection.State == System.Data.ConnectionState.Closed)
				MysqlConnection.Open();

			if (MysqlConnection.State == System.Data.ConnectionState.Broken)
			{
				MysqlConnection.Close();
				MysqlConnection.Open();
			}

			return MysqlConnection;
		}

		#region 运行MySQL语句或存储过程,返回受影响的行数
		/// <summary>
		/// 运行MySQL语句或存储过程
		/// </summary>
		/// <param name="type">命令类型</param>
		/// <param name="sqlString">sql语句</param>
		/// <param name="pstmt">參数</param>
		/// <returns>运行结果</returns>
		public static int ExecuteNonQuery(CommandType type, String sqlString, MySql.Data.MySqlClient.MySqlParameter[] para)
		{
			try
			{
				using (MySql.Data.MySqlClient.MySqlCommand com = new MySql.Data.MySqlClient.MySqlCommand())
				{
					com.Connection = GetCon();
					com.CommandText = @sqlString;
					com.CommandType = type;
					if (para != null)
						com.Parameters.AddRange(para);

					int val = com.ExecuteNonQuery();
					com.Parameters.Clear();

					return val;
				}
			}
			catch (Exception ex)
			{
				Logger.Error("运行MySQL语句或存储过程,异常！", ex);

				return 0;
			}
			finally
			{
				if (MysqlConnection.State != ConnectionState.Closed)
					MysqlConnection.Close();
			}
		}

		/// <summary>
		/// 运行带事务的SQL语句或存储过程
		/// </summary>
		/// <param name="trans">事务</param>
		/// <param name="type">命令类型</param>
		/// <param name="sqlString">SQL语句</param>
		/// <param name="pstmt">參数</param>
		/// <returns>运行结果</returns>
		public static int ExecuteNonQuery(MySql.Data.MySqlClient.MySqlTransaction trans, CommandType type, String sqlString, MySql.Data.MySqlClient.MySqlParameter[] para)
		{
			try
			{
				using (MySql.Data.MySqlClient.MySqlCommand com = new MySql.Data.MySqlClient.MySqlCommand())
				{
					com.Connection = MysqlConnection;
					com.CommandText = @sqlString;
					com.CommandType = type;
					if (para != null)
						com.Parameters.AddRange(para);
					if (trans != null)
						com.Transaction = trans;

					int val = com.ExecuteNonQuery();
					com.Parameters.Clear();

					return val;
				}
			}
			catch (Exception ex)
			{
				Logger.Error("运行MySQL语句或存储过程2,异常！", ex);

				return 0;
			}
			finally
			{
				if (MysqlConnection.State != ConnectionState.Closed)
					MysqlConnection.Close();
			}
		}
		#endregion

		#region 运行SQL语句或存储过程,返回 DataTable
		/// <summary>
		/// 运行SQL语句或存储过程,返回 DataTable
		/// </summary>
		/// <param name="type">命令类型</param>
		/// <param name="sqlString">SQL语句</param>
		/// <param name="pstmt">參数</param>
		/// <returns>运行结果</returns>
		public static DataTable ExecuteReaderToDataTable(CommandType type, String sqlString, MySql.Data.MySqlClient.MySqlParameter[] para)
		{
			DataTable dt = new DataTable();
			MySql.Data.MySqlClient.MySqlDataReader dr = null;

			try
			{
				using (MySql.Data.MySqlClient.MySqlCommand com = new MySql.Data.MySqlClient.MySqlCommand())
				{
					com.Connection = GetCon();
					com.CommandText = @sqlString;
					com.CommandType = type;
					if (para != null)
						com.Parameters.AddRange(para);

					using (dr = com.ExecuteReader(CommandBehavior.CloseConnection))
					{
						if (dr != null)
							dt.Load(dr);

						com.Parameters.Clear();
					}

					return dt;
				}
			}
			catch (Exception ex)
			{
				Logger.Error("运行SQL语句或存储过程,返回 DataTable,异常！", ex);

				return null;
			}
			finally
			{
				if (dr != null && !dr.IsClosed)
					dr.Close();

				if (MysqlConnection.State != ConnectionState.Closed)
					MysqlConnection.Close();
			}
		}
		#endregion

	}

特别说明：

1、MySql.Data.dll mysql官网提供的组件,下载后加入引用到当前项目就可以使用

2、參数化处理

在SQLServer中參数化处理符号为"@"，參数化演示样例如：

         SqlParameter[] param = {
               new SqlParameter("@TABLEDATA", tableData)
         };

在MySql中參数化处理符号为“?”,參数化示比如：

         MySql.Data.MySqlClient.MySqlParameter[] paras = {
		 new MySql.Data.MySqlClient.MySqlParameter("?LIBOR_NAME",name),
         };

其它參考文章例如以下：

http://www.jb51.net/article/30342.htm