jsp连接数据库增删改查
一,创建表
二.将jar包复制导入到lib文件夹下
三.创建工具包连接数据库
package com.bill.util; import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement; public class DBUtil { public static String db_url = "jdbc:mysql://localhost:3306/test?useSSL=false";
public static String db_user = "root";//账号
public static String db_pass = "mm123456";//密码 public static Connection getConn () {
Connection conn = null; try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(db_url, db_user, db_pass);
} catch (Exception e) {
e.printStackTrace();
} return conn;
} public static void close (Statement state, Connection conn) {
if (state != null) {
try {
state.close();
} catch (SQLException e) {
e.printStackTrace();
}
} if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
} public static void close (ResultSet rs, Statement state, Connection conn) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
} if (state != null) {
try {
state.close();
} catch (SQLException e) {
e.printStackTrace();
}
} if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
} }
四.初始化成员函数
package com.bill.been;
public class Bill {
private int id;
private String type;
private String year;
private String month;
private String day;
private String income;
private String pay;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getYear() {
return year;
}
public void setYear(String year) {
this.year = year;
}
public String getMonth() {
return month;
}
public void setMonth(String month) {
this.month = month;
}
public String getDay() {
return day;
}
public void setDay(String day) {
this.day = day;
}
public String getIncome() {
return income;
}
public void setIncome(String income) {
this.income = income;
}
public String getPay() {
return pay;
}
public void setPay(String pay) {
this.pay = pay;
}
public Bill(int id,String type,String year,String month,String day,String income,String pay)
{
this.id=id;
this.type=type;
this.year=year;
this.month=month;
this.day=day;
this.income=income;
this.pay=pay;
}
public Bill(String type,String year,String month,String day,String income,String pay)
{
this.type=type;
this.year=year;
this.month=month;
this.day=day;
this.income=income;
this.pay=pay;
}
}
五.查找数据库 dao层
package com.bill.dao;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List; import com.bill.util.DBUtil;
import com.bill.been.Bill;
@SuppressWarnings("unused")
public class BillDao {
//-----------------------------------------------------------------------------------------------------------------------------
public boolean add(Bill bill) {
String sql = "insert into bill(type,year,month,day,income,pay) values('" + bill.getType() + "','" + bill.getYear() + "','"+bill.getMonth()+"','"+bill.getDay()+"','"+bill.getIncome()+"','"+bill.getPay()+"')";
Connection conn = DBUtil.getConn();//调用方法连接数据库
Statement state = null;
boolean f = false;
int a = 0 ; try { //监视大括号内的代码
state = conn.createStatement();
a = state.executeUpdate(sql);
} catch (Exception e) { //捕获错误
e.printStackTrace();
} finally {
//关闭z 连接
DBUtil.close(state, conn);
} if (a > 0) {
f = true;
}
return f;
} //---------------------------------------------------------------------------------------------------------------------------- public Bill getBillById(int id) {
String sql = "select * from bill where id ='" + id + "'";
Connection conn = DBUtil.getConn();
Statement state = null;
ResultSet rs = null;
Bill bill = null; try {
state = conn.createStatement();
rs = state.executeQuery(sql);
while (rs.next()) {
String type = rs.getString("type");
String year = rs.getString("year");
String month = rs.getString("month");
String day = rs.getString("day");
String income = rs.getString("income");
String pay = rs.getString("pay");
bill = new Bill(id, type, year, month,day,income,pay);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
DBUtil.close(rs, state, conn);
} return bill;
} public List<Bill> dellist() {
String sql = "select * from bill";
List<Bill> dellist = new ArrayList<>();
Connection conn = DBUtil.getConn();
Statement state = null;
ResultSet rs = null; try {
state = conn.createStatement();
rs = state.executeQuery(sql);
Bill bean = null;
while (rs.next()) {
int id = rs.getInt("id");
String type2 = rs.getString("type");
String year2 = rs.getString("year");
String month2 = rs.getString("month");
String day2 = rs.getString("day");
String income2=rs.getString("income");
String pay2=rs.getString("pay");
bean = new Bill(id, type2, year2, month2,day2,income2,pay2);
dellist.add(bean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(rs, state, conn);
} return dellist;
} public boolean delete (int id) {
boolean f = false;
String sql = "delete from bill where id='" + id + "'";
Connection conn = DBUtil.getConn();
Statement state = null;
int a = 0; try {
state = conn.createStatement();
a = state.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(state, conn);
} if (a > 0) {
f = true;
}
return f;
}
//--------------------------------------------------------------------------------------------------------------
public List<Bill> modifylist() {
String sql = "select * from bill";
List<Bill> modifylist = new ArrayList<>();
Connection conn = DBUtil.getConn();
Statement state = null;
ResultSet rs = null; try {
state = conn.createStatement();
rs = state.executeQuery(sql);
Bill bean = null;
while (rs.next()) {
int id = rs.getInt("id");
String type2 = rs.getString("type");
String year2 = rs.getString("year");
String month2 = rs.getString("month");
String day2 = rs.getString("day");
String income2=rs.getString("income");
String pay2=rs.getString("pay");
bean = new Bill(id, type2, year2, month2,day2,income2,pay2);
modifylist.add(bean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(rs, state, conn);
} return modifylist;
} public boolean modify(Bill bill) {
String sql = "update bill set type='" + bill.getType() + "', year='" + bill.getYear() + "',month='" + bill.getMonth()
+ "',day='"+bill.getDay()+"',income='"+bill.getIncome()+"',pay='"+bill.getPay()+"'where id='" + bill.getId() + "'";
Connection conn = DBUtil.getConn();
Statement state = null;
boolean f = false;
int a = 0; try {
state = conn.createStatement();
a = state.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(state, conn);
} if (a > 0) {
f = true;
}
return f;
}
//------------------------------------------------------------------------------------------------------------------------------
public List<Bill> search(String type,String year,String month,String day,String income,String pay) {
String sql = "select * from bill where ";
if (type != "") {
sql += "type like '%" + type + "%'";
}
if (year != "") {
sql += "year like '%" + year + "%'";
}
if (month != "") {
sql += "month like '%" + month + "%'";
}
if (day != "") {
sql += "day like '%" + day + "%'";
}if (income != "") {
sql += "income like '%" + income + "%'";
}if (pay != "") {
sql += "pay like '%" + pay + "%'";
}
List<Bill> list = new ArrayList<>();
Connection conn = DBUtil.getConn();
Statement state = null;
ResultSet rs = null; try {
state = conn.createStatement();
rs = state.executeQuery(sql);
Bill bean = null;
while (rs.next()) {
int id = rs.getInt("id");
String type2 = rs.getString("type");
String year2 = rs.getString("year");
String month2 = rs.getString("month");
String day2 = rs.getString("day");
String income2 = rs.getString("income");
String pay2 = rs.getString("pay");
bean = new Bill(id, type2, year2, month2,day2,income2,pay2);
list.add(bean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(rs, state, conn);
} return list;
} }
.六.页面的交互
package com.bill.servlet;
import java.io.IOException;
import java.util.List; import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import com.bill.dao.BillDao;
import com.bill.been.Bill;
@WebServlet("/BillServlet")
public class BillServlet extends HttpServlet{
private static final long serialVersionUID = 1L; public BillServlet() {
super();
}
BillDao dao=new BillDao(); protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
String method = req.getParameter("method");
if ("add".equals(method)) {
add(req, resp);
}else if ("getbillbyid".equals(method)) {
getBillById(req, resp);
}else if ("dellist".equals(method)) {
dellist(req,resp);
}else if ("delete".equals(method)) {
delete(req,resp);
}else if ("getbillbyid2".equals(method)) {
getBillById2(req, resp);
}else if ("modifylist".equals(method)) {
modifylist(req,resp);
}else if ("modify".equals(method)) {
modify(req,resp);
}else if ("search".equals(method)) {
search(req,resp);
}
}
//------------------------------------------------------------------------------------------------------
private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
// TODO Auto-generated method stub
String type = req.getParameter("type");
String year = req.getParameter("year");
String month = req.getParameter("month");
String day = req.getParameter("day");
String income = req.getParameter("income");
String pay = req.getParameter("pay"); Bill bill=new Bill(type,year,month,day,income,pay);
if(dao.add(bill)) {
req.setAttribute("message", "保存成功!");
req.getRequestDispatcher("add.jsp").forward(req, resp);
}else {
req.setAttribute("message", "保存失败!");
req.getRequestDispatcher("add.jsp").forward(req, resp);
}
}
//------------------------------------------------------------------------------------------------------ private void getBillById(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
int id = Integer.parseInt(req.getParameter("id"));
Bill bill = dao.getBillById(id);
req.setAttribute("bill", bill);
req.getRequestDispatcher("delete.jsp").forward(req,resp); } private void dellist(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
req.setCharacterEncoding("utf-8");
List<Bill> bills = dao.dellist();
req.setAttribute("bills", bills);
req.getRequestDispatcher("dellist.jsp").forward(req,resp); } private void delete(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
int id = Integer.parseInt(req.getParameter("id"));
dao.delete(id);
req.setAttribute("message", "删除成功");
req.getRequestDispatcher("index.jsp").forward(req,resp);
}
//---------------------------------------------------------------------------------------------------------------------------------
private void getBillById2(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
int id = Integer.parseInt(req.getParameter("id"));
Bill bill = dao.getBillById(id);
req.setAttribute("bill", bill);
req.getRequestDispatcher("modify.jsp").forward(req,resp); } private void modifylist(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
List<Bill> bills = dao.modifylist();
req.setAttribute("bills",bills);
req.getRequestDispatcher("modifylist.jsp").forward(req,resp);
} private void modify(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
int id = Integer.parseInt(req.getParameter("id"));
String type = req.getParameter("type");
String year = req.getParameter("year");
String month = req.getParameter("month");
String day = req.getParameter("day");
String income = req.getParameter("income");
String pay = req.getParameter("pay");
Bill bill = new Bill(id, type, year, month,day,income,pay); dao.modify(bill);
req.setAttribute("message", "修改成功");
req.getRequestDispatcher("BillServlet?method=modifylist").forward(req,resp);
} //--------------------------------------------------------------------------------------------------------------------------------- private void search(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
String type = req.getParameter("type");
String year = req.getParameter("year");
String month = req.getParameter("month");
String day = req.getParameter("day");
String income = req.getParameter("income");
String pay = req.getParameter("pay");
List<Bill> bills = dao.search(type,year,month,day,income,pay);
req.setAttribute("bills", bills);
req.getRequestDispatcher("searchlist.jsp").forward(req,resp);
}
}
主页面
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>首页</title>
<style>
.a{
font-size: 26px;
margin-top: 20px;
}
</style>
</head>
<body>
<div align="center">
<h1 style="color:bluegreen;">记帐本</h1>
<div class="a">
<a href="add.jsp">账单记录</a>
</div>
<div class="a">
<a href="BillServlet?method=dellist">账单删除</a>
</div>
<div class="a">
<a href="BillServlet?method=modifylist">修改账单</a>
</div>
<div class="a">
<a href="search.jsp">查询账单</a>
</div>
</div>
</body>
</html>
添加
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>记录账单</title>
<style>
.a{
margin-top: 20px;
}
.b{
font-size: 20px;
width: 160px;
color: white;
background-color: greenyellow;
}
</style>
</head>
<body>
<%
Object message = request.getAttribute("message");
if(message!=null && !"".equals(message)){ %>
<script type="text/javascript">
alert("<%=request.getAttribute("message")%>");
</script>
<%} %>
<div align="center">
<h1 style="color: red;">记账</h1> <form action="BillServlet?method=add" method="post" onsubmit="return check()">
<div class="a">
类型<input type="text" id="type" name="type"/>
</div>
<div class="a">
年<input type="text" id="year" name="year" />
</div>
<div class="a">
月<input type="text" id="month" name="month"/>
</div>
<div class="a">
日<input type="text" id="day" name="day"/>
</div>
<div class="a">
收入<input type="text" id="income" name="income"/>
</div>
<div class="a">
支出<input type="text" id="pay" name="pay"/>
</div> <div class="a">
<button type="submit" class="b">保 存</button>
</div>
<div class="a">
<a href="index.jsp" >返回</a>
</div>
</form>
</div> </body>
</html>
删除
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
.a{
margin-top: 20px;
}
.b{
font-size: 20px;
width: 160px;
color: white;
background-color: greenyellow;
}
.tb, td {
border: 1px solid black;
font-size: 22px;
}
</style>
</head>
<body>
<%
Object message = request.getAttribute("message");
if(message!=null && !"".equals(message)){ %>
<script type="text/javascript">
alert("<%=request.getAttribute("message")%>");
</script>
<%} %>
<div align="center">
<h1 style="color: red;">账单信息列表</h1>
<a href="index.jsp">返回主页</a>
<table class="tb">
<tr>
<td>id</td>
<td>账单类型</td>
<td>年</td>
<td>月</td>
<td>日</td>
<td>收入</td>
<td>支出</td>
<td align="center" colspan="2">操作</td>
</tr>
<c:forEach items="${bills}" var="xm">
<tr>
<td>${xm.id}</td>
<td>${xm.type}</td>
<td>${xm.year}</td>
<td>${xm.month}</td>
<td>${xm.day}</td>
<td>${xm.income}</td>
<td>${xm.pay}</td>
<td><a href="BillServlet?method=getbillbyid&id=${xm.id}">删除</a></td>
</tr>
</c:forEach>
</table>
</div>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
.a{
margin-top: 20px;
}
.b{
font-size: 20px;
width: 160px;
color: white;
background-color: greenyellow;
}
.tb, td {
border: 1px solid black;
font-size: 22px;
}
</style>
</head>
<body>
<%
Object message = request.getAttribute("message");
if(message!=null && !"".equals(message)){ %>
<script type="text/javascript">
alert("<%=request.getAttribute("message")%>");
</script>
<%} %> <div align="center">
<h1 style="color: red;">账单信息删除</h1>
<a href="index.jsp">返回主页</a>
<table class="tb">
<tr>
<td>账单类型</td>
<td>${bill.type}</td>
</tr>
<tr>
<td>年</td>
<td>${bill.year}</td>
</tr>
<tr>
<td>月</td>
<td>${bill.month}</td>
</tr>
<tr>
<td>日</td>
<td>${bill.day}</td>
</tr>
<tr>
<td>收入</td>
<td>${bill.income}</td>
</tr>
<tr>
<td>支出</td>
<td>${bill.pay}</td>
</tr>
</table>
<div class="a">
<a onclick="return check()" href="BillServlet?method=delete&id=${bill.id}">删 除</a>
</div>
</div>
<script type="text/javascript">
function check() {
if (confirm("真的要删除吗？")){
return true;
}else{
return false;
}
}
</script>
</body>
</html>
修改
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
.a{
margin-top: 20px;
}
.b{
font-size: 20px;
width: 160px;
color: white;
background-color: greenyellow;
}
.tb, td {
border: 1px solid black;
font-size: 22px;
}
</style>
</head>
<body>
<%
Object message = request.getAttribute("message");
if(message!=null && !"".equals(message)){ %>
<script type="text/javascript">
alert("<%=request.getAttribute("message")%>");
</script>
<%} %>
<div align="center">
<h1 style="color: red;">账单信息列表</h1>
<a href="index.jsp">返回主页</a>
<table class="tb">
<tr>
<td>id</td>
<td>账单类型</td>
<td>年</td>
<td>月</td>
<td>日</td>
<td>收入</td>
<td>支出</td>
<td align="center" colspan="2">操作</td>
</tr>
<c:forEach items="${bills}" var="item">
<tr>
<td>${item.id}</td>
<td>${item.type}</td>
<td>${item.year}</td>
<td>${item.month}</td>
<td>${item.day}</td>
<td>${item.income}</td>
<td>${item.pay}</td>
<td><a href="BillServlet?method=getbillbyid2&id=${item.id}">修改</a></td>
</tr>
</c:forEach>
</table>
</div>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
.a{
margin-top: 20px;
}
.b{
font-size: 20px;
width: 160px;
color: white;
background-color: greenyellow;
}
</style>
</head>
<body>
<%
Object message = request.getAttribute("message");
if(message!=null && !"".equals(message)){ %>
<script type="text/javascript">
alert("<%=request.getAttribute("message")%>");
</script>
<%} %>
<div align="center">
<h1 style="color: cyan;">记账信息修改</h1>
<a href="index.jsp">返回主页</a>
<form action="BillServlet?method=modify" method="post" onsubmit="return check()">
<div class="a">
账单类型<input type="text" id="type" name="type" value="${bill.type}"/>
</div>
<div class="a">
年<input type="text" id="year" name="year" value="${bill.year}"/>
</div>
<div class="a">
月<input type="text" id="month" name="month" value="${bill.month}"/>
</div>
<div class="a">
日<input type="text" id="day" name="day" value="${bill.day}"/>
</div>
<div class="a">
收入<input type="text" id="income" name="income" value="${bill.income}"/>
</div>
<div class="a">
支出<input type="text" id="pay" name="pay" value="${bill.pay}"/>
</div> <input type="hidden" id="id" name="id" value="${bill.id}"/>
<div class="a">
<button type="submit" class="b">修 改</button>
</div>
</form>
</div> </body>
</html>
查找
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
.a{
margin-top: 20px;
}
.b{
font-size: 20px;
width: 160px;
color: white;
background-color: greenyellow;
}
</style>
</head>
<body>
<div align="center">
<h1 style="color: cyan;">账单信息查询</h1>
<a href="index.jsp">返回主页</a>
<form action="BillServlet?method=search" method="post" onsubmit="return check()">
<div class="a">
账单类型<input type="text" id="type" name="type"/>
</div>
<div class="a">
年<input type="text" id="year" name="year" />
</div>
<div class="a">
月<input type="text" id="month" name="month" />
</div>
<div class="a">
日<input type="text" id="day" name="day" />
</div>
<div class="a">
收入<input type="text" id="income" name="income" />
</div>
<div class="a">
支出<input type="text" id="pay" name="pay" />
</div>
<div class="a">
<button type="submit" class="b">查 询</button>
</div>
</form>
</div>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
.a{
margin-top: 20px;
}
.b{
font-size: 20px;
width: 160px;
color: white;
background-color: greenyellow;
}
.tb, td {
border: 1px solid black;
font-size: 22px;
}
</style>
</head>
<body>
<div align="center">
<h1 style="color: red;">账单信息列表</h1>
<a href="index.jsp">返回主页</a>
<table class="tb">
<tr>
<td>id</td>
<td>粘单类型</td>
<td>年</td>
<td>月</td>
<td>日</td>
<td>收入</td>
<td>支出</td>
</tr>
<!-- forEach遍历出adminBeans -->
<c:forEach items="${bills}" var="item" varStatus="status">
<tr>
<td>${item.id}</td>
<td><a>${item.type}</a></td>
<td>${item.year}</td>
<td>${item.month}</td>
<td>${item.day}</td>
<td>${item.income}</td>
<td>${item.pay}</td>
</tr>
</c:forEach>
</table>
</div>
</body>
</html>
jsp连接数据库增删改查的更多相关文章
- JavaWeb后端jsp之增删改查
今日主题:JavaWeb后端jsp之增删改查 实体类: Student.java: package cn.itcast.model.entity; public class Student { pri ...
- eclipce连接数据库增删改查
1.在mysql中新建一个名为course的数据库,并在其中新建一个course数据表,包含四个字段,id,name,teacher,classname如图(注意:将id设为自动递增,否则后面新增会出 ...
- php连接数据库增删改查----多条件查询
关于查询,可以直接写在主页面上 来进行查询 首先,先建立一个表单 <form method="post" action="crud.php"> &l ...
- java连接数据库增删改查公共方法
package dao; import java.io.IOException; import java.sql.CallableStatement; import java.sql.Connecti ...
- C#连接数据库 增删改查
- java+jsp+sqlserver实现简单的增删改查操作 连接数据库代码
1,网站系统开发需要掌握的技术 (1)网页设计语言,html语言css语言等 (2)Java语言 (3)数据库 (4)等 2,源程序代码 (1) 连接数据库代码 package com.jaovo.m ...
- 数据库中的记录通过servlet回显到jsp页面中（连接数据库或者查询參照:对数据进行增删改查）
我们常常会用到通过图书的名称来查询图书那么这种话我们也就会使用到从数据库中搜索出数据而且载入到自己的Jsp页面中 这种话我们须要将从数据库中获取到的数据放进响应中然后通过%=request.getAt ...
- 最简单的jsp+servlet的增删改查代码
package ceet.ac.cn.dao; import java.sql.Connection; import java.sql.PreparedStatement; import java.s ...
- web项目总结——通过jsp+servlet实现对oracle的增删改查功能
1.DAO模式 分包:依次建立 entity:实体包,放的是跟oracle数据库中表结构相对应的对象的属性,也就是这个对象有什么 dao:增删改查接口,实现增删改查的具体方法 service:同dao ...
随机推荐
- EF Core For Oracle11中Find FirstOrDefault等方法执行失败
问题描述 最近在使用ef core连接oracle的发现Find.FirstOrDefault.Skip Task分页等等方法执行失败.使用的是docker安装的oracle11,错误如下图: 解决办 ...
- python数据类型（第三弹）
本文着重介绍python语言的两种数据类型——列表和元组 列表 相比于整型.浮点型等数据类型,列表是一个复合数据类型,它更像一个容器,可以容纳多种不同类型的数据. 如上图:列表a中装进去了字符串&qu ...
- Html介绍,如何用代码展示我制作的第一个网页？
一般来说,第一次制作个人网页的朋友们,首句基本都是你好,全世界hello world 代码展示如下: <!DOCTYPE HTML> <html> <head> & ...
- JS DOM创建节点
DOM节点操作之增删改查 document.write() 可以向文档中添加节点 但是有个致命问题,会把文档原有的节点全部清空 因此不推荐使用 <!DOCTYPE html> <ht ...
- Android实战项目——家庭记账本（五）
今天博客写的有点晚(好像算是昨天的了),有一点小bug刚刚改完.今天完成的任务有: 1.统计页的布局和功能 2.主页碎片的图表功能 实现效果如下: 其中,统计 ...
- 洛谷P1056 排座椅
洛谷P1056 排座椅 洛谷传送门 题目描述 上课的时候总会有一些同学和前后左右的人交头接耳,这是令小学班主任十分头疼的一件事情.不过,班主任小雪发现了一些有趣的现象,当同学们的座次确定下来之后,只有 ...
- Linux分区类型EXT2、EXT3、EXT4详解
一.EXT2与EXT3 Linux之前缺省情况下使用的文件系统为Ext2,ext2文件系统的确高效稳定.但是,随着Linux系统在关键业务中的应用,Linux文件系统的弱点也渐渐显露出来了:其中系统缺 ...
- python 学习笔记之手把手讲解如何使用原生的 urllib 发送网络请求
urllib.urlopen(url[,data[,proxies]]) : https://docs.python.org/2/library/urllib.html python 中默认自带的网络 ...
- ng-起步
目前,无论你使用什么前端框架,都必然要使用到各种 NodeJS 工具,Angular 也不例外.与其它框架不同,Angular 从一开始就走的"全家桶"式的设计思路,因此 @ang ...
- LeetCode：26删除有序数组中相同的数.(Python3)
给定一个排序数组,你需要在原地删除重复出现的元素,使得每个元素只出现一次,返回移除后数组的新长度. 不要使用额外的数组空间,你必须在原地修改输入数组并在使用 O(1) 额外空间的条件下完成. 示例 1 ...