Hibernate讀取數據

在開發中一般都是用hibernate的query來執行sql語句，來訪問數據庫。因爲query是將查詢結果中的每一條記錄都放到bean中（query.setBeanclass就是用來設置這個bean的），然後將這些包含了查詢結果的bean放到list中，並返回。所以我們在開發中只要做以下步驟1。想query傳遞select語句；2。設置bean；3。執行query。這樣就可以得到包含了所有查詢結果的list，取出裏面的bean就可以用了
List list = null;
String strSql = "";
strSql = "Select * From Student";
Query query = session.createQuery(strSql);
query.setBeanclass("在這裏寫一下你bean所在的位置");
list = query.list();
return list;

 

其中的query和session都是經過重新封裝的。這裏提供一個簡單的查詢方法！
Session session=HibernateSessionFactory.currentSession();
Transaction transaction=session.beginTransaction();
Query query=session.createQuery("from Student");
List list=query.list();
transaction.commit();
return list;

 

java code:

Dao類：

public List getUserByName(String userName) {

        List list = new ArrayList();

        String sql = "select * from UserInfo where name =?";

        con = ConnectionManager.getCn();
        try {
            ps = con.prepareStatement(sql);
            ps.setString(1, userName);
            rs = ps.executeQuery();

            while (rs.next()) {
                LoginInfo loginInfo = new LoginInfo();
                loginInfo.setId(rs.getInt("id"));
                loginInfo.setName(rs.getString("name"));
                loginInfo.setPwd(rs.getString("pwd"));
                list.add(loginInfo);
            }

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {

                ConnectionManager.closeRs(rs);
                ConnectionManager.closePs(ps);
                ConnectionManager.closeCn(con);

            } catch (SQLException e) {
                e.printStackTrace();
            }

        }

        return list;

    }




Action 類

Java code

/** * 登錄方法 */ public ActionForward login(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { LoginForm checkform = (LoginForm) form; UserInfoService userInfoService = new UserInfoService(); LoginInfo loginInfo = new LoginInfo(); loginInfo = checkform.getLoginInfo(); boolean bool = userInfoService.Login(loginInfo); if (bool) { request.setAttribute("loginInfo", loginInfo); return new ActionForward("/ok.jsp"); } else { return new ActionForward("/Error.jsp"); } }

Action 類：（存）

/** * 登錄方法 */ public ActionForward login(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { LoginForm checkform = (LoginForm) form; UserInfoService userInfoService = new UserInfoService(); LoginInfo loginInfo = new LoginInfo(); loginInfo = checkform.getLoginInfo(); boolean bool = userInfoService.Login(loginInfo); if (bool) { request.setAttribute("loginInfo", loginInfo); return new ActionForward("/ok.jsp"); } else { return new ActionForward("/Error.jsp"); } }

Jsp 頁面：取值

int allCounts = (Integer) request.getAttribute("allCounts"); List allLogs = (List) request.getAttribute("allLogs");