在.NET连接MySQL

1、首先上MySQL网站下驱动：http://www.mysql.com/products/connector/

2、安装下载的安装包

3、我们在Visual Studio里创建一个Web Application，然后引入X:/XXXX/MySQL/MySQL Connector Net 6.3.6/Assemblies下的v2.0或v4.0里的DLL文件。

在MySQLHelper里面加入：

using MySql.Data.MySqlClient;

 在Web.config里面加入MySQL数据库的连接字符串：

<connectionStrings><add name="MySqlStr" connectionString="server = localhost; user id = XXXX; password = XXXX; database = XXXX"/></connectionStrings>

 4、封装好的MySQLHelper类

using System;using System.Collections.Generic;using System.Data;using System.Collections;using MySql.Data.MySqlClient;using System.Configuration;namespace DBUtility{/// <summary>/// The SQLHelper class is intended to encapsulate high performance,/// scalable best practices for common uses of SqlClient./// </summary>public abstract class MySQLHelper{	// Read the connection strings from the configuration file	public static readonly string ConnectionStringLocalTransaction = ConfigurationManager.ConnectionStrings["OraConnString1"].ConnectionString;	public static readonly string ConnectionStringInventoryDistributedTransaction = ConfigurationManager.ConnectionStrings["OraConnString2"].ConnectionString;	public static readonly string ConnectionStringOrderDistributedTransaction = ConfigurationManager.ConnectionStrings["OraConnString3"].ConnectionString;	public static readonly string ConnectionStringProfile = ConfigurationManager.ConnectionStrings["OraProfileConnString"].ConnectionString;	public static readonly string ConnectionStringMembership = ConfigurationManager.ConnectionStrings["OraMembershipConnString"].ConnectionString;	//Create a hashtable for the parameter cached	private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());	/// <summary>	/// Execute a database query which does not include a select	/// </summary>	/// <param name="connString">Connection string to database</param>	/// <param name="cmdType">Command type either stored procedure or SQL</param>	/// <param name="cmdText">Acutall SQL Command</param>	/// <param name="commandParameters">Parameters to bind to the command</param>	/// <returns></returns>	public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)	{	// Create a new MySql command	MySqlCommand cmd = new MySqlCommand();	//Create a connection	using (MySqlConnection connection = new MySqlConnection(connectionString))	{		//Prepare the command		PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);		//Execute the command		int val = cmd.ExecuteNonQuery();		cmd.Parameters.Clear();		return val;	}	}	/// <summary>	/// Execute an MySqlCommand (that returns no resultset) against an existing database transaction	/// using the provided parameters.	/// </summary>	/// <remarks>	/// e.g.:	///int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter(":prodid", 24));	/// </remarks>	/// <param name="trans">an existing database transaction</param>	/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>	/// <param name="commandText">the stored procedure name or PL/SQL command</param>	/// <param name="commandParameters">an array of MySqlParamters used to execute the command</param>	/// <returns>an int representing the number of rows affected by the command</returns>	public static int ExecuteNonQuery(MySqlTransaction trans, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)	{	MySqlCommand cmd = new MySqlCommand();	PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);	int val = cmd.ExecuteNonQuery();	cmd.Parameters.Clear();	return val;	}	/// <summary>	/// Execute an MySqlCommand (that returns no resultset) against an existing database connection	/// using the provided parameters.	/// </summary>	/// <remarks>	/// e.g.:	///int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter(":prodid", 24));	/// </remarks>	/// <param name="conn">an existing database connection</param>	/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>	/// <param name="commandText">the stored procedure name or PL/SQL command</param>	/// <param name="commandParameters">an array of MySqlParamters used to execute the command</param>	/// <returns>an int representing the number of rows affected by the command</returns>	public static int ExecuteNonQuery(MySqlConnection connection, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)	{	MySqlCommand cmd = new MySqlCommand();	PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);	int val = cmd.ExecuteNonQuery();	cmd.Parameters.Clear();	return val;	}	/// <summary>	/// Execute a select query that will return a result set	/// </summary>	/// <param name="connString">Connection string</param>	//// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>	/// <param name="commandText">the stored procedure name or PL/SQL command</param>	/// <param name="commandParameters">an array of MySqlParamters used to execute the command</param>	/// <returns></returns>	public static MySqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)	{	//Create the command and connection	MySqlCommand cmd = new MySqlCommand();	MySqlConnection conn = new MySqlConnection(connectionString);	try	{		//Prepare the command to execute		PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);		//Execute the query, stating that the connection should close when the resulting datareader has been read		MySqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);		cmd.Parameters.Clear();		return rdr;	}	catch	{		//If an error occurs close the connection as the reader will not be used and we expect it to close the connection		conn.Close();		throw;	}	}	/// <summary>	/// Execute an MySqlCommand that returns the first column of the first record against the database specified in the connection string	/// using the provided parameters.	/// </summary>	/// <remarks>	/// e.g.:	///Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter(":prodid", 24));	/// </remarks>	/// <param name="connectionString">a valid connection string for a SqlConnection</param>	/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>	/// <param name="commandText">the stored procedure name or PL/SQL command</param>	/// <param name="commandParameters">an array of MySqlParamters used to execute the command</param>	/// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>	public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)	{	MySqlCommand cmd = new MySqlCommand();	using (MySqlConnection conn = new MySqlConnection(connectionString))	{		PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);		object val = cmd.ExecuteScalar();		cmd.Parameters.Clear();		return val;	}	}	/// <summary>	/// Execute a MySqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction	/// using the provided parameters.	/// </summary>	/// <param name="transaction">A valid SqlTransaction</param>	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>	/// <param name="commandText">The stored procedure name or PL/SQL command</param>	/// <param name="commandParameters">An array of MySqlParamters used to execute the command</param>	/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>	public static object ExecuteScalar(MySqlTransaction transaction, CommandType commandType, string commandText, params MySqlParameter[] commandParameters)	{	if (transaction == null)		throw new ArgumentNullException("transaction");	if (transaction != null && transaction.Connection == null)		throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");	// Create a command and prepare it for execution	MySqlCommand cmd = new MySqlCommand();	PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);	// Execute the command & return the results	object retval = cmd.ExecuteScalar();	// Detach the SqlParameters from the command object, so they can be used again	cmd.Parameters.Clear();	return retval;	}	/// <summary>	/// Execute an MySqlCommand that returns the first column of the first record against an existing database connection	/// using the provided parameters.	/// </summary>	/// <remarks>	/// e.g.:	///Object obj = ExecuteScalar(conn, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter(":prodid", 24));	/// </remarks>	/// <param name="conn">an existing database connection</param>	/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>	/// <param name="commandText">the stored procedure name or PL/SQL command</param>	/// <param name="commandParameters">an array of MySqlParamters used to execute the command</param>	/// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>	public static object ExecuteScalar(MySqlConnection connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)	{	MySqlCommand cmd = new MySqlCommand();	PrepareCommand(cmd, connectionString, null, cmdType, cmdText, commandParameters);	object val = cmd.ExecuteScalar();	cmd.Parameters.Clear();	return val;	}	/// <summary>	/// Add a set of parameters to the cached	/// </summary>	/// <param name="cacheKey">Key value to look up the parameters</param>	/// <param name="commandParameters">Actual parameters to cached</param>	public static void CacheParameters(string cacheKey, params MySqlParameter[] commandParameters)	{	parmCache[cacheKey] = commandParameters;	}	/// <summary>	/// Fetch parameters from the cache	/// </summary>	/// <param name="cacheKey">Key to look up the parameters</param>	/// <returns></returns>	public static MySqlParameter[] GetCachedParameters(string cacheKey)	{	MySqlParameter[] cachedParms = (MySqlParameter[])parmCache[cacheKey];	if (cachedParms == null)		return null;	// If the parameters are in the cache	MySqlParameter[] clonedParms = new MySqlParameter[cachedParms.Length];	// return a copy of the parameters	for (int i = 0, j = cachedParms.Length; i < j; i++)		clonedParms[i] = (MySqlParameter)((ICloneable)cachedParms[i]).Clone();	return clonedParms;	}	/// <summary>	/// Internal function to prepare a command for execution by the database	/// </summary>	/// <param name="cmd">Existing command object</param>	/// <param name="conn">Database connection object</param>	/// <param name="trans">Optional transaction object</param>	/// <param name="cmdType">Command type, e.g. stored procedure</param>	/// <param name="cmdText">Command test</param>	/// <param name="commandParameters">Parameters for the command</param>	private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, CommandType cmdType, string cmdText, MySqlParameter[] commandParameters)	{	//Open the connection if required	if (conn.State != ConnectionState.Open)		conn.Open();	//Set up the command	cmd.Connection = conn;	cmd.CommandText = cmdText;	cmd.CommandType = cmdType;	//Bind it to the transaction if it exists	if (trans != null)		cmd.Transaction = trans;	// Bind the parameters passed in	if (commandParameters != null)	{		foreach (MySqlParameter parm in commandParameters)		cmd.Parameters.Add(parm);	}	}	/// <summary>	/// Converter to use boolean data type with MySql	/// </summary>	/// <param name="value">Value to convert</param>	/// <returns></returns>	public static string MySqlBit(bool value)	{	if (value)		return "Y";	else		return "N";	}	/// <summary>	/// Converter to use boolean data type with MySql	/// </summary>	/// <param name="value">Value to convert</param>	/// <returns></returns>	public static bool MySqlBool(string value)	{	if (value.Equals("Y"))		return true;	else		return false;	}}}