自己寫的資料庫鏈結類，請高手指點一下。

using system;

using system.collections.generic;
using system.text;
using system.data;
using system.data.oledb;
namespace databaseconn
set}
private oledbconnection connection;
/// /// 資料庫鏈結
/// 
public oledbconnection conn
set}
private oledbcommand command;
/// /// 資料庫命令執行者
/// 
public oledbcommand command
set}
private oledbdataadapter dateadapter;
private oledbdatareader datereader;
/// /// 資料庫讀取器
/// 
public oledbdatareader datereader
set}
private string sql;
/// /// 執行sql
/// 
public string sql
set}
private string error_info;
/// /// 錯誤資訊
/// 
public string errorinfo
set}
/// /// 初始化鏈結
/// 
public connection()
/// /// 初始化鏈結
/// 
/// 資料庫鏈結字串
public connection(string connectionstring)
/// /// 取得datatable
/// 
/// 返回datatable
public datatable getdatatable()
command.commandtype = commandtype.text;
command.commandtext = sql;
dateadapter = new oledbdataadapter();
dateadapter.selectcommand = command;
dateadapter.fill(temp);
//清理oledbcommand.parameters變數。
if (command.parameters.count > 0)
}catch (exception e)
return temp;
}/// /// 取得dataset
/// 
/// 返回dataset
public dataset getdataset()
command.commandtype = commandtype.text;
command.commandtext = sql;
dateadapter = new oledbdataadapter();
dateadapter.selectcommand = command;
dateadapter.fill(temp);
//清理oledbcommand.parameters變數。
if (command.parameters.count > 0)
}catch (exception e)
return temp;
}/// /// 執行sql命令
/// 
/// 返回影響行數
public int executesql()
command.commandtype = commandtype.text;
command.commandtext = sql;
command.connection = connection;
temp = command.executenonquery();
//清理oledbcommand.parameters變數。
if (command.parameters.count > 0)
}catch (exception e)
return temp;
}/// /// 取得第一列第一行
/// 
/// 返回第一列第一行
public object executescalar()
command.commandtype = commandtype.text;
command.commandtext = sql;
command.connection = connection;
temp = command.executescalar();
//清理oledbcommand.parameters變數。
if (command.parameters.count > 0)
}catch (exception e)
return temp;
}/// /// 取得讀取器
/// 
/// 返回讀取器
public object getdatareader()
command.commandtype = commandtype.text;
command.commandtext = sql;
command.connection = connection;
temp = command.executereader();
//清理oledbcommand.parameters變數。
if (command.parameters.count > 0)
}catch (exception e)
return temp;
}/// /// 關閉釋放所有資源鏈結
/// 
public void dispose()
if (datereader != null)
datereader.dispose();
}if (connection != null)
connection.dispose();
}if (command != null)}}
}

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