程式師世界 >> 編程語言 >> 更多編程語言 >> 編程綜合問答 >> 數據庫分類查詢-MVC實現連接數據庫實現按條件查詢

數據庫分類查詢-MVC實現連接數據庫實現按條件查詢

編輯：編程綜合問答

MVC實現連接數據庫實現按條件查詢: mvc結構連接數據庫類色圖書館管理系統但不要那麼復雜的我只要裡面的分類查詢顯示這一塊簡單的就行給例子謝謝大神了哈！！！！

最佳回答：

list頁面相當於V
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

首頁

添加學生

學號: 姓名: name="name"> 班級名稱:

${bj.b_name }
/c:forEach

學號
姓名
性別
生日日期
愛好
班級名稱
操作

${stu.xh}
${stu.name}

男
/c:if

女
/c:if
${stu.birthday}
${stu.favorite}
${stu.b_name}
修改
刪除

/c:forEach

test="${pageNow> 1}">
上頁
/c:if
下頁
/c:if 當前第 /
頁

$(document).ready(function() { $("#pre").click(function() { $("#form").attr('action', 'index.jsp?pageNow=${pageNow-1}'); $("#form").submit(); }); $("#next").click(function() { $("#form").attr('action', 'index.jsp?pageNow=${pageNow+1}'); $("#form").submit(); }); $("#btn").click(function() { $("#form").attr('action', 'index.jsp'); $("#form").submit(); }); });

servlet 相當於C
public class listStudent extends HttpServlet {

private static final long serialVersionUID = -6441193787541923748L;

private StudentService studentService = new StudentServiceImpl();
private BJService bJService = new BJServiceImpl();

/**
 * @Description: 處理doGet方法
 * @param req
 * @param resp
 * @throws ServletException
 * @throws IOException
 * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest,
 *      javax.servlet.http.HttpServletResponse)
 */
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException {

    // 交給doPost處理
    doPost(req, resp);
}

/**
 * @Description: 處理doPost方法
 * @param req
 * @param resp
 * @throws ServletException
 * @throws IOException
 * @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest,
 *      javax.servlet.http.HttpServletResponse)
 */
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException {

    final int pageSize = 3;
    int pageNow = 1;
    int pageCount = 1;
    // 查詢條件封裝成map集合
    Map<String, String> paramsMap = new HashMap<String, String>();

    if (StringUtils.isNotBlank(req.getParameter("xh"))) {
        paramsMap.put("xh", req.getParameter("xh"));
    }
    if (StringUtils.isNotBlank(req.getParameter("name"))) {
        paramsMap.put("name", req.getParameter("name"));
    }
    if (StringUtils.isNotBlank(req.getParameter("b_no"))) {
        paramsMap.put("b_no", req.getParameter("b_no"));
    }
    // 設置當前頁
    if (StringUtils.isNotBlank(req.getParameter("pageNow"))) {
        pageNow = Integer.parseInt(req.getParameter("pageNow"));
    }
    List<Student> listStudent = null;
    List<BJ> listBJ=null;
    try {
        // 根據pageSize,pageNow和parmasMap查詢所有符合條件的學生
        listStudent = studentService.listStudent(pageSize, pageNow,
                paramsMap);
        listBJ=bJService.listAllBJ();
        // 獲取頁數
        pageCount = studentService.getCount(pageSize, paramsMap);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    // 學生數據集合
    req.setAttribute("list", listStudent);
    //班級數據集合
    req.setAttribute("listBJ", listBJ);
    // 總頁數
    req.setAttribute("pageCount", pageCount);
    // 當前頁
    req.setAttribute("pageNow", pageNow);

    req.getRequestDispatcher("/listStudent.jsp").forward(req, resp);
}

javaBean 相當於M
public class Student {

private int xh;// 學號
private String name;// 姓名
private int sex;// 性別，0表示男，1表示女
private String birthday;// 生日
private String favorite;// 愛好
private String b_name;// 班級名稱
private int b_no;//班級號

public int getXh() {
    return xh;
}

public void setXh(int xh) {
    this.xh = xh;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getSex() {
    return sex;
}

public void setSex(int sex) {
    this.sex = sex;
}

public String getBirthday() {
    return birthday;
}

public void setBirthday(String birthday) {
    this.birthday = birthday;
}

public String getFavorite() {
    return favorite;
}

public void setFavorite(String favorite) {
    this.favorite = favorite;
}

public String getB_name() {
    return b_name;
}

public void setB_name(String b_name) {
    this.b_name = b_name;
}

public int getB_no() {
    return b_no;
}

public void setB_no(int b_no) {
    this.b_no = b_no;
}

}