dbaccess.cs

一个基于.NETFramework架构的图书管理系统

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;

namespace DataAccess
{
    public class DBAccess
    {
        public static int ExecuteSQL(SqlCommand cmd)
        {
            if (cmd == null)
                throw new ArgumentNullException("cmd");
            SqlConnection conn = new SqlConnection(Configuration.ApplicationConfiguration.ConnectionString);
            cmd.Connection = conn;
            //int n=0;
            try
            {
                conn.Open();
                int n = cmd.ExecuteNonQuery();
                return n;
            }
            catch (Exception ex)
            {
                throw new DBException(ex);
            }
            finally
            {
                if (conn.State == ConnectionState.Open)
                {
                    conn.Close();
                }
            }

        }
        public static object GetScalar(SqlCommand cmd)
        {
            if (cmd == null)
                throw new ArgumentNullException("cmd");
            SqlConnection conn = new SqlConnection(Configuration.ApplicationConfiguration.ConnectionString);
            cmd.Connection = conn;
            try
            {
                conn.Open();
                object ob = cmd.ExecuteScalar();
                return ob;
            }
            catch (Exception ex)
            {
                throw new DBException(ex);
            }
            finally
            {
                if (conn.State == ConnectionState.Open)
                {
                    conn.Close();
                }
            }

        }

        public static DataSet QueryData(SqlCommand cmd)
        {
            if (cmd == null)
                throw new ArgumentNullException("cmd");
            SqlConnection conn = new SqlConnection(Configuration.ApplicationConfiguration.ConnectionString);
            cmd.Connection = conn;
            SqlDataAdapter da1 = new SqlDataAdapter(cmd);
            DataSet ds1 = new DataSet();
            try
            {
                da1.Fill(ds1);
                return ds1;
            }
            catch (Exception ex)
            {
                throw new DBException(ex);
            }
            finally
            {
                if (conn.State == ConnectionState.Open)
                {
                    conn.Close();
                }
            }
        }
    }

}