c# Forbind til Mysql-databasen

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/// <summary>
/// MySQL数据库操作
/// author:hhm
/// date:2012-2-22
/// </summary>
public class MySqlDbHelper
{
#region 私有变量
private const string defaultConfigKeyName = "DbHelper";//连接字符串默认Key
private string connectionString;
private string providerName;
#endregion
#region 构造函数
/// <summary>
/// 默认构造函数(DbHelper)
/// </summary>
public MySqlDbHelper()
{
this.connectionString = ConfigurationManager.ConnectionStrings["DbHelper"].ConnectionString;
this.providerName = ConfigurationManager.ConnectionStrings["DbHelper"].ProviderName;
}
/// <summary>
/// DbHelper构造函数
/// </summary>
/// <param name="keyName">连接字符串名</param>
public MySqlDbHelper(string keyName)
{
this.connectionString = ConfigurationManager.ConnectionStrings[keyName].ConnectionString;
this.providerName = ConfigurationManager.ConnectionStrings[keyName].ProviderName;
}
#endregion
public int ExecuteNonQuery(string sql, params MySqlParameter[] parameters) {
MySqlConnection con = new MySqlConnection(connectionString);
con.Open();
MySqlCommand cmd = new MySqlCommand(sql, con);
foreach (MySqlParameter parameter in parameters)
{
cmd.Parameters.Add(parameter);
}
int res =0;
try
{
res = cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
res = -1;
}
cmd.Dispose();
con.Close();
return res;
}
public object ExecuteScalar(string sql, params MySqlParameter[] parameters)
{
MySqlConnection con = new MySqlConnection(connectionString);
con.Open();
MySqlCommand cmd = new MySqlCommand(sql, con);
foreach (MySqlParameter parameter in parameters)
{
cmd.Parameters.Add(parameter);
}
object res = cmd.ExecuteScalar();
cmd.Dispose();
con.Close();
return res;
}
public DataTable ExecuteDataTable(string sql, params MySqlParameter[] parameters)
{
MySqlConnection con = new MySqlConnection(connectionString);
con.Open();
MySqlCommand cmd = new MySqlCommand(sql, con);
foreach (MySqlParameter parameter in parameters)
{
cmd.Parameters.Add(parameter);
}
DataSet dataset = new DataSet();//dataset放执行后的数据集合
MySqlDataAdapter adapter = new MySqlDataAdapter(cmd);
adapter.Fill(dataset);
cmd.Dispose();
con.Close();
return dataset.Tables[0];
}
}

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