DBOperate.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

/// <summary>
///DBOperate 的摘要说明
/// </summary>
public class DBOperate
{
    private static SqlConnection con = null;
    private static SqlCommand cmd = null;
    private static SqlDataAdapter da = null;
   // private static SqlDataReader dr = null;
    public static SqlConnection createCon()
    {
        string constr = ConfigurationManager.AppSettings["server"];
        //string constr = ConfigurationManager.ConnectionStrings["connection"].ToString();
        con = new SqlConnection(constr);
        return con;
    }
    public static int execSQL(string sql)
    {
        int rows;
        try
        {
            con = createCon();
            if (con.State != ConnectionState.Open)
                con.Open();
             
            cmd = new SqlCommand(sql, con);
            rows= cmd.ExecuteNonQuery();
            con.Close();
        }
        catch (Exception e)
        {
            throw new Exception(e.Message, e);
        }
        finally
        {
            if (con.State == ConnectionState.Open)
                con.Close();
        }
        return rows;
      
    }

    public static DataSet getDataSet(string sql, string table)
    {
        try
        {
            con = createCon();
            da = new SqlDataAdapter(sql, con);
            DataSet ds = new DataSet();
            da.Fill(ds, table);
            return ds;
        }
        catch (Exception e)
        {
            throw new Exception(e.Message, e);
        }
    }
    public static SqlDataReader getReader(string sql)
    {
        try
        {
            con = createCon();
            if (con.State != ConnectionState.Open)
                con.Open();
            cmd = new SqlCommand(sql, con);
            return cmd.ExecuteReader();
        }
        catch (Exception e)
        {
            throw new Exception(e.Message, e);
        }
    }
}