datacontrol.cs

一个很好的管理系统代码！！！！ 能实现车辆的管理…… 大家用的试下啊

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

/// <summary>
/// DataBase 的摘要说明

/// </summary>
public class DataControl
{
    public DataControl()
	{
		//
		// TODO: 在此处添加构造函数逻辑
		//
	}
    public static SqlConnection createConnection()
    {
        //从webconfig中取得字符串连接方式
        SqlConnection cnn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["String"].ConnectionString);
        return cnn;
    }
    public static DataTable GetData(string SetStr )
    {
        //定义数据库连接 查询并填充DataSet

        SqlConnection tmpCnn = DataControl.createConnection();
        if (tmpCnn.State != 0)
        {
            tmpCnn.Close();
        }
        tmpCnn.Open();
        SqlDataAdapter cmd = new SqlDataAdapter(SetStr, tmpCnn);
        DataSet tmpDataSet = new DataSet();
        cmd.Fill(tmpDataSet);
        return tmpDataSet.Tables[0];
    }

    public static void Execute(string sqlStr)
    {
        //定义数据库连接　　执行数据库的增加　修改和删除数据的功能
        SqlConnection tmpCnn = DataControl.createConnection();
        if (tmpCnn.State != 0)
        {
            tmpCnn.Close();
        }
        tmpCnn.Open();

        SqlCommand cmd = new SqlCommand();
        cmd.CommandText = sqlStr;
        cmd.Connection = tmpCnn;
        cmd.ExecuteNonQuery();
    }

    public static int GetIndex(DropDownList dr,string value)
    {
        //返回指定的编号
        for (int i = 0; i < dr.Items.Count; i++)
        {
            if (dr.Items[i].Text == value)
            {
                return i;
            }
        }
        return 0;
    }

    public static  string GetUserInfo(int id)
    {
        //返回住户信息
        DataTable dt = new DataTable();
        dt = DataControl.GetData("select * from 住户,楼栋 where 住户.楼栋代码=楼栋.楼栋代码 and 住户.住户代码=" + id);
        return dt.Rows[0]["楼栋名称"].ToString() + "-" + dt.Rows[0]["房间号"].ToString() + "-" + dt.Rows[0]["户主"].ToString(); 
    }

}