;                  m_strPassword = myReader["password"].ToString() ;
                    m_strEmail = myReader["Email"].ToString() ;
                    m_strHomepage = myReader["Homepage"].ToString() ;
                    m_strSignature = myReader["Signature"].ToString() ;
                    bExists = true ;
                }
                else
                {
                    bExists = false ;
                }

                myReader.Close() ;
                myConn.Close() ;
                
            }
            catch(SQLException e)        //如果出现异常
            {

                throw(new Exception("数据库异常:" + e.Message)) ;
                
            }                    

            //返回结果
            return bExists ;            
        }

        //重载，根据用户ID查找用户
        public bool GetUser(int a_intUserID)
        {

            bool bExists = false ;

            MyConnection myConn = new MyConnection() ;
            try
            {
                myConn.Open() ;
                SQLCommand myCommand = new SQLCommand() ;
                myCommand.ActiveConnection = myConn ;
                myCommand.CommandText = "select * from BBSUser where id=" +

a_intUserID.ToString() ;

                SQLDataReader myReader ;
                myCommand.Execute(out myReader) ;
                
                if (myReader.Read())
                {
                    m_intID = (int)myReader["ID"] ;
                    m_strUserName = myReader["UserName"].ToString() ;
                    m_strPassword = myReader["password"].ToString() ;
                    m_strEmail = myReader["Email"].ToString() ;
                    m_strHomepage = myReader["Homepage"].ToString() ;
                    m_strSignature = myReader["Signature"].ToString() ;
                    bExists = true ;
                }
                else
                {
                    bExists = false ;
                }

                myReader.Close() ;
                myConn.Close() ;
                
            }
            catch(SQLException e)        //如果出现异常
            {

                throw(new Exception("数据库异常:" + e.Message)) ;
                
            }                    

            //返回结果
            return bExists ;            
        }

        //新建用户
        public void CreateUser(BBSUser.CreateType a_enumCreateType ,string

a_strUserName ,
                                string a_strPassword ,

string a_strEmail ,
                                string a_strHomepage ,

string a_strSignature)
        {
            //监测参数有效性
            if (a_strUserName.IndexOf("'") != -1 || a_strPassword.IndexOf("'")

!= -1
                || a_strEmail.IndexOf("'") != -1 ||

a_strHomepage.IndexOf("'") != -1
                || a_strSignature.IndexOf("'") != -1)
            {
                throw(new Exception("包含非法字符")) ;
            }

            try
            {
                MyOwnClass.MyConnection myConn = new MyConnection() ;
                SQLCommand myCmd = new SQLCommand() ;

                //判断是新建用户还是修改用户资料
     &

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