用C#写的ASP.NET数据库操作类知识

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小海军 2012-01-30 14:26:46

文章标签 职场知识休闲数据库操作 文章分类 数据库

下面是用C#写的ASP.NET数据库操作类：

文本格式复制代码打印?

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;
namespace Mysqlserver
{
/// < summary>
/// SqlServerDataBase 的摘要说明
/// < /summary>
public class SqlServerDataBase
{
private string strError = null;
private int intCount = 0;
public SqlServerDataBase()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
/// < summary>
/// 公开方法DBConn，返回数据库连接
/// < /summary>
/// < returns>< /returns>
public SqlConnection DBconn()
{
string strConn = "Server=(local);Database=GlobalMeetings;Uid=sa;pwd=";
try
{
return new SqlConnection(strConn);
}
catch (Exception)
{
return null;
}
}
/// < summary>
/// 公开属性ErrorMessage，返回错误信息
/// < /summary>
public string ErrorMessage
{
get
{
return strError;
}
}
/// < summary>
/// 根据查询语句从数据库检索数据
/// < /summary>
/// < param name="strSelect">查询语句< /param>
/// < param name="SqlConn">数据库连接< /param>
/// < returns>有数据则返回DataSet对象，否则返回null< /returns>
public DataSet Select(string SelectString, SqlConnection sqlConn)
{
strError = "";
SqlConnection conn;
if (sqlConn == null)
{
conn = DBconn();
}
else
{
conn = sqlConn;
}
try
{
//若数据库连接的当前状态是关闭的，则打开连接
if (conn.State == ConnectionState.Closed)
{
conn.Open();
}
SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
SqlCommand selectCommand = new SqlCommand(SelectString, conn);
selectCommand.CommandType = CommandType.Text;
mySqlDataAdapter.SelectCommand = selectCommand;
DataSet myDS = new DataSet();
mySqlDataAdapter.Fill(myDS);
return myDS;
}
catch (Exception e)
{
strError = "数据检索失败：" + e.Message;
return null;
}
finally
{
if (conn.State != ConnectionState.Closed)
{
conn.Close();
}
}
}
/// < summary>
/// 更新数据库
/// < /summary>
/// < param name="UpdateString">update Sql语句< /param>
/// < param name="SqlConn">数据库连接< /param>
/// < returns>更新成功返回true< /returns>
public bool Update(string UpdateString, SqlConnection SqlConn)
{
return udiDataBase(UpdateString, SqlConn);
}
/// < summary>
/// 从数据库中删除数据
/// < /summary>
/// < param name="DeleteString">delete Sql语句< /param>
/// < param name="SqlConn">数据库连接< /param>
/// < returns>删除成功返回true< /returns>
public bool Delete(string DeleteString, SqlConnection SqlConn)
{
return udiDataBase(DeleteString, SqlConn);
}
/// < summary>
/// 把数据插入数据库
/// < /summary>
/// < param name="InsertString">insert Sql语句< /param>
/// < param name="SqlConn">数据库连接< /param>
/// < returns>插入成功返回true< /returns>
public bool Insert(string InsertString, SqlConnection SqlConn)
{
return udiDataBase(InsertString, SqlConn);
}
/// < summary>
/// 根据Sql语句更新数据库
/// < /summary>
/// < param name="UDIString">更新语句< /param>
/// < param name="SqlConn">数据库连接< /param>
/// < returns>更新成功则返回true< /returns>
public bool udiDataBase(string UDIString, SqlConnection SqlConn)
{
strError = "";
SqlConnection conn;
if (SqlConn == null)
{
conn = DBconn();
}
else
{
conn = SqlConn;
}
try
{
if (conn.State == ConnectionState.Closed)
{
conn.Open();
}
SqlCommand cmd = new SqlCommand(UDIString, conn);
cmd.CommandType = CommandType.Text;
intCount = cmd.ExecuteNonQuery();
return !(intCount < 1);
}
catch (Exception e)
{
strError = "更新数据库失败：" + e.Message;
return false;
}
finally
{
if (conn.State != ConnectionState.Closed)
{
conn.Close();
}
}
}
}
}

ASP.NET数据库操作类写好了，下面是两种调用方法

1、

文本格式复制代码打印?

string strUserPsw = UserPsw.Text.Trim();
string UserPassWord = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(strUserPsw, "MD5");//md5加密
SqlServerDataBase obj = new SqlServerDataBase();
obj.Insert("insert into asUserInfo (UserName,UserPassword,Question,Answer,CreateTime) values('" + UserName.Text.Trim() + "','" + UserPassword + "','" + Question.Text.Trim() + "','" + Answer.Text.Trim() + "','" + DateTime.Now.ToString() + "' )", null);

2、

文本格式复制代码打印?

private bool IsUsernameExist(string strUsername)
{
bool bRet = true;
SqlServerDataBase db = new SqlServerDataBase();
DataSet ds = db.Select("select * from asUserInfo where UserName = '" + strUsername + "'", null);
if (ds == null ds.Tables.Count == 0 ds.Tables[0].Rows.Count == 0)
{
bRet = false;
}
else
{
bRet = true;
}
return bRet;
}