c#小软件(SaveClassic)开发手记--(3)基础类(数据访问类DataAccess)
好些日子没整理自己的笔记了,实在是自己太忙了。我知道着不是借口,真是很累,根本就没有时间精力去整理这些笔记,现在稍微有点时间,我赶快整理一下思路。我想了想,今天还是把一些基本的类整理一下吧,这些都是我们在平常开发中经常见到的。这些内容,我自己感觉会有些毛病,希望大家帮忙改进一下,谢谢。
一、数据访问类DataAccess
数据访问类是我这个小软件最基础的类,它主要完成的功能就是,实现了对Access数据库的访问操作,具体代码如下。
using System.Data.OleDb;
using System.Data;
using System;
namespace Common
{
public class DataAccess
{
protected static OleDbConnection conn = new OleDbConnection();
protected static OleDbCommand comm = new OleDbCommand();
public static string connstring = "";
public DataAccess()
{
}
private static void openConnection()
{
if (conn.State == ConnectionState.Closed)
{
conn.ConnectionString = @"Provider=Microsoft.Jet.OleDb.4.0;Data Source=" + connstring;
comm.Connection = conn;
try
{
conn.Open();
}
catch (Exception e)
{ throw new Exception(e.Message); }
}
}
private static void closeConnection()
{
if (conn.State == ConnectionState.Open)
{
conn.Close();
conn.Dispose();
comm.Dispose();
}
}
public static void excuteSql(string sqlstr)
{
try
{
openConnection();
comm.CommandType = CommandType.Text;
comm.CommandText = sqlstr;
comm.ExecuteNonQuery();
}
catch (Exception e)
{
throw new Exception(e.Message);
}
finally
{ closeConnection(); }
}//执行sql语句
public static OleDbDataReader dataReader(string sqlstr)
{
OleDbDataReader dr = null;
try
{
openConnection();
comm.CommandText = sqlstr;
comm.CommandType = CommandType.Text;
dr = comm.ExecuteReader(CommandBehavior.CloseConnection);
}
catch
{
try
{
dr.Close();
closeConnection();
}
catch { }
补充:软件开发 , C# ,