连接MySql 数据库

1.web.config 读取数据

 <add name="SqlConnection" connectionString="server=192.168.1.100;uid=a;pwd=a;database=person" providerName="MySQLProv"/>

2.读取数据库的公共方法

public static string ConnectionString = ConfigurationManager.ConnectionStrings["SqlConnection"].ConnectionString;

/// <summary>
/// 建立数据库联接
/// </summary>
/// <returns></returns>
public MySqlConnection getconn()
{
MySqlConnection myconn = new MySqlConnection(ConnectionString);
return myconn;

}

/// <summary>

///执行SqlCommand

/// </summary>

/// <param name="M_Str_sqlstr"></param>
public MySqlCommand getcom(string M_Str_sqlstr)
{
MySqlConnection myconn = this.getconn();

myconn.Open();

MySqlCommand sqlcom = new MySqlCommand(M_Str_sqlstr, myconn);
sqlcom.ExecuteNonQuery();
//sqlcom.Dispose();
//myconn.Close();

//myconn.Dispose();
return sqlcom;

}
public DataSet getds(string M_str_sqlstr, string M_str_table)
{
MySqlConnection myconn = getconn();
myconn.Open();
MySqlDataAdapter sqlda = new MySqlDataAdapter(M_str_sqlstr, myconn);
DataSet myds = new DataSet();
sqlda.Fill(myds, M_str_table);
return myds;
}

public MySqlDataReader getread(string M_str_sqlstr)
{
MySqlConnection myconn = this.getconn();
MySqlCommand mycmd = new MySqlCommand(M_str_sqlstr, myconn);
myconn.Open();
MySqlDataReader mysqlread = mycmd.ExecuteReader(CommandBehavior.CloseConnection);
return mysqlread;

}

3.读取

如：查询

//查询sql
String sqlSearch = "select * from a";
MySqlCommand mySqlCommand = getcom(sqlSearch);
try
{
using (MySqlDataReader reader = mySqlCommand.ExecuteReader())
{
IList<Systemaccount> list = GetListFromReader(reader);
if (list.Count > 0)
{
return list[0];
}
}
}
catch (Exception ex)
{
//Log Error here;
}
return null;

不过最后设置完以后，出现“Host 'localhost' is not allowed to connect to this MySQL server”

1.首先停止mysql服务，在控制面板---管理工具--服务里面

 直接把mysql数据库下的user表中的host字段为“localhost”的值修改为“%”就可以了

可是我改完之后没有效果，我上网搜索了各种解决方案都不行，一开始我没把服务停止，后来把服务停止后就可以了，不知道是不是这个原因，希望大侠们指点

参照的连接 http://www.blogjava.net/acooly/archive/2008/09/17/229368.html