C#(.NET)数据访问连接、查询、插入等操作的封装类

发布时间：2020-03-17 23:01:23 所属栏目：Asp教程来源：互联网

导读：一个C#（.NET）数据访问连接、查询、插入等操作的封装类

using System;
using System.Data;
using System.Data.SqlClient;
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;

/// <summary>
/// Public 的摘要说明
/// </summary>
public class PublicClass
{   //定义一个公用成员
    public SqlConnection conn;

    public PublicClass()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }
    #region 建立数据库连接
    public void OpenConn()
    {
        String strconn = System.Configuration.ConfigurationManager.AppSettings["sqlconn"].ToString();
        conn = new SqlConnection(strconn);
        if (conn.State.ToString().ToLower() == "open")
        {
            //连接为打开时
        }
        else
        {
            //连接为关闭时
            conn.Open();
        }
    }
    #endregion
    #region 关闭并释放连接
    public void CloseConn()
    {
        if (conn.State.ToString().ToLower() == "open")
        {
            //连接为打开时
            conn.Close();
            conn.Dispose();
        }
    }
    #endregion
    #region 返回DataReader，用于读取数据
    public SqlDataReader DataRead(string sql)
    {
        OpenConn();
        SqlCommand cmd = new SqlCommand(sql, conn);
        SqlDataReader dr = cmd.ExecuteReader();
        return dr;
    }
#endregion
    #region 返回一个数据集
    public DataSet MySqlDataSet(string Sql, string tableName)
    {
        OpenConn();
        SqlDataAdapter da;
        DataSet ds = new DataSet();
        da = new SqlDataAdapter(Sql, conn);
        da.Fill(ds, tableName);
        CloseConn();
        return ds;
    }
    #endregion
    //返回一个数据集
    public DataView MySqlDataSource(string Sql)
    {
        OpenConn();
        SqlDataAdapter da;
        DataSet ds = new DataSet();
        da = new SqlDataAdapter(Sql, conn);
        da.Fill(ds, "temp");
        CloseConn();
        return ds.Tables[0].DefaultView;
    }
    #region 执行一个SQL操作:添加、删除、更新操作

    //执行一个SQL操作:添加、删除、更新操作
    public void MySqlExcute(string sql)
    {
        OpenConn();
        SqlCommand cmd;
        cmd = new SqlCommand(sql, conn);
        cmd.ExecuteNonQuery();
        cmd.Dispose();
        CloseConn();
    }
    #endregion
    #region 执行一个SQL操作:添加、删除、更新操作，返回受影响的行
    //执行一个SQL操作:添加、删除、更新操作，返回受影响的行
    public int MySqlExecuteNonQuery(string sql)
    {
        OpenConn();
        SqlCommand cmd;
        cmd = new SqlCommand(sql, conn);
        int flag = cmd.ExecuteNonQuery();
        return flag;
    }
    #endregion

    public object MySqlExecuteScalar(string sql)
    {
        OpenConn();
        SqlCommand cmd;
        cmd = new SqlCommand(sql, conn);
        object obj = cmd.ExecuteScalar();
        cmd.Dispose();
        CloseConn();
        return obj;
    }

    /// <summary>
    /// 返回DataTable对象
    /// </summary>
    /// <param name="sql">sql语句</param>
    /// <returns></returns>
    public DataTable MySqlDataTable(string sql)
    {
        OpenConn();
        DataSet ds = new DataSet();
        SqlDataAdapter da = new SqlDataAdapter(sql, conn);
        da.Fill(ds, "table");
        CloseConn();
        return ds.Tables["table"];
    }

    /// <summary>
    /// 返回一个数据集的记录数
    /// </summary>
    /// <param name="sql">传递的sql语句必须为一个统计查询</param>
    /// <returns></returns>
    public int MySqlRecordCount(string sql)
    {
        //注：Sql 语句必须是一个统计查询
        OpenConn();
        SqlCommand cmd = new SqlCommand();
        cmd.CommandText = sql;
        cmd.Connection = conn;
        SqlDataReader dr;
        dr = cmd.ExecuteReader();
        int RecordCount = -1;
        while (dr.Read())
        {
            RecordCount = int.Parse(dr[0].ToString());
        }
        CloseConn();
        return RecordCount;
    }

    /// <summary>
    /// 自定义的功能警告
    /// </summary>
    /// <param name="str">弹出信息框内容</param>
    public void SetAlert(string str)
    {
        HttpContext.Current.Response.Write("<script language='JavaScript' type='text/JavaScript'>alert('" + str + "');</script>");

    }
    //返回上一页
    public void AddErro(string message)
    {
        HttpContext.Current.Response.Write("<script>alert('" + message + "');history.back(-1);</script>");
    }

    //关闭窗口
    public void SetCloseWindow()
    {
        HttpContext.Current.Response.Write("<script language='JavaScript' type='text/JavaScript'>window.close();</script>");
    }

    /// <summary>
    /// 地址跳转
    /// </summary>
    /// <param name="str">跳转地址</param>
    public void SetLocation(string str)
    {
        HttpContext.Current.Response.Write("<script language='JavaScript' type='text/JavaScript'>location='" + str + "';</script>");
    }

    public string AjaxSetAlert(string str)
    {
        return "<script language='JavaScript' type='text/JavaScript'>alert('" + str + "');</script>";
    }

    //过滤非法字符
    public string FilterStr(string Str)
    {
        Str = Str.Trim();
        Str = Str.Replace("*", "");
        Str = Str.Replace("=", "");
        Str = Str.Replace("http://www.jb51.net/", "");
        Str = Str.Replace("$", "");
        Str = Str.Replace("#", "");
        Str = Str.Replace("@", "");
        Str = Str.Replace("&", "");
        return Str;
    }

    //Md5加密算法
    public string md5(string str)
    {
        return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "md5").ToLower().Substring(0, 12);
    }
    public string RndNum(int VcodeNum)
    {
        string Vchar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,P,Q,R,S,T,U,W,X";
        string[] VcArray = Vchar.Split(new Char[] { ',' }); //将字符串生成数组
        string VNum = "";
        int temp = -1;

        Random rand = new Random();

        for (int i = 1; i < VcodeNum + 1; i++)
        {
            if (temp != -1)
            {
                rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));
            }

            int t = rand.Next(31);            //数组一般从0开始读取，所以这里为31*Rnd
            if (temp != -1 && temp == t)
            {
                return RndNum(VcodeNum);
            }
            temp = t;
            VNum += VcArray[t];
        }
        return VNum;
    }
}

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