asp.net 数据库操作类

 

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{/// 
/// SqlServerDataBase 的摘要说明/// 
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//}/// 
/// 公开方法DBConn，返回数据库连接/// 
/// public SqlConnection DBconn(){string strConn = "Server=(local);Database=GlobalMeetings;Uid=sa;pwd=";try{return new SqlConnection(strConn);}catch (Exception){return null;}}/// 
/// 公开属性ErrorMessage，返回错误信息/// 
public string ErrorMessage{get{return strError;}}/// 
/// 根据查询语句从数据库检索数据/// 
/// 查询语句/// 数据库连接/// 有数据则返回DataSet对象，否则返回nullpublic 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)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)}}/// 
/// 更新数据库/// 
/// Update Sql语句/// 数据库连接/// 更新成功返回truepublic bool Update(string UpdateString, SqlConnection SqlConn){return udiDataBase(UpdateString, SqlConn);}/// 
/// 从数据库中删除数据/// 
/// Delete Sql语句/// 数据库连接/// 删除成功返回truepublic bool Delete(string DeleteString, SqlConnection SqlConn){return udiDataBase(DeleteString, SqlConn);}/// 
/// 把数据插入数据库/// 
/// Insert Sql语句/// 数据库连接/// 插入成功返回truepublic bool Insert(string InsertString, SqlConnection SqlConn){return udiDataBase(InsertString, SqlConn);}/// 
/// 根据Sql语句更新数据库/// 
/// 更新语句/// 数据库连接/// 更新成功则返回truepublic bool udiDataBase(string UDIString, SqlConnection SqlConn){strError = "";SqlConnection conn;if (SqlConn == null){conn = DBconn();}else{conn = SqlConn;}try{if (conn.State == ConnectionState.Closed)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)}}}}-----------------------------两种调用方法1、 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、 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;}