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("/", "");
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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