使用JDBC连接MySQL数据库操作增删改查（非常详细，适合学习，欢迎转载）
目录
1.首先这个Myeclipse的包名以及一些实现的类(这样子写是我的习惯)
2.接下来我们创建数据库(MySQL)
3.在数据库里面添加数据
4.首先是BaseDao,这个是重中之重,注意那个数据库的名字,强调所在的包名
5.这个是实体类,我相信大家都会写,注意所在的包名,注意所在的包名注意所在的包名,重要的事情所三遍
6.接下来我们写BookingDao
7.下面我们写Servlet
1.查询的Servlet
2.添加的Servlet
3.修改的Servlet
4.删除的Servlet
8.再次写JSP页面
1.index.jsp 初始界面
2.insert.jsp 添加页面
3.Update.jsp 修改页面
9. 最后这个是在浏览器中显示的效果,这个是查询效果,查询全表如下
1.查询
2.增加
3.修改(接下里我们把刚才我们添加的数据修改)
4.删除(这个效果可能不是很明显,但为了界面我还是把它给截图下来了)
1.首先这个Myeclipse的包名以及一些实现的类(这样子写是我的习惯)
2.接下来我们创建数据库(MySQL)
3.在数据库里面添加数据
4.首先是BaseDao,这个是重中之重,注意那个数据库的名字,强调所在的包名
package dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class BaseDao {
/***
*
* @author 数据库连接类
*
*/
private String driver ="com.mysql.jdbc.Driver";
private String url="jdbc:mysql://localhost:3306/表名"; ---------自己写数据库表名，只要数据库的表名跟这里的一样就行
private String name="数据库名称"; ----------你自己数据库的名称
private String pwd="密码"; -----------你自己数据库的密码
Connection conn=null;
/***
*
* @return 打开连接
*/
/* public Connection getconn(){
Connection conn=null;
Context ctx;
try {
ctx = new InitialContext();
DataSource ds=(DataSource)ctx.lookup("java:comp/env/jdbc/news");
conn=ds.getConnection();
}catch (Exception e) {
e.printStackTrace();
}
return conn;
} */
protected Connection getconn(){
conn=null;
try {
Class.forName(driver);
conn=DriverManager.getConnection(url,name,pwd);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}
/****
*
* @param 关闭数据库连接
*/
protected void closeAll(Connection conn ,PreparedStatement ps,ResultSet rs){
if(rs!=null)
try {
if(rs!=null)
rs.close();
if(ps!=null)
ps.close();
if(conn!=null)
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/***
*
* @param 增删改方法
* @param 接受 参数为 SQL语句 和 对象数组
* @return 返回受影响行数
*/
public int executeUpdate(String sql ,Object []ob){
conn=getconn();
PreparedStatement ps=null;
try {
ps=prepareStatement(conn,sql,ob);
int i=ps.executeUpdate();
return i;
} catch (SQLException e) {
// TODO Auto-generated catch block
// e.printStackTrace();
return 0;
}finally{
closeAll(conn, ps, null);
}
}
/***
* 查询方法
*/
protected PreparedStatement prepareStatement(Connection conn,String sql,Object []ob){
PreparedStatement ps=null;
try {
int index=1;
ps = conn.prepareStatement(sql);
if(ps!=null&&ob!=null){
for (int i = 0; i < ob.length; i++) {
ps.setObject(index, ob[i]);
index++;
}
}
} catch (SQLException e1) {
e1.printStackTrace();
}
return ps;
}
}5.这个是实体类,我相信大家都会写,注意所在的包名
package entity;
public class Booking {
private int id;
private int categoryId;
private String title;
private String summary;
private String uploaduser;
private String createdate;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getCategoryId() {
return categoryId;
}
public void setCategoryId(int categoryId) {
this.categoryId = categoryId;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getSummary() {
return summary;
}
public void setSummary(String summary) {
this.summary = summary;
}
public String getUploaduser() {
return uploaduser;
}
public void setUploaduser(String uploaduser) {
this.uploaduser = uploaduser;
}
public String getCreatedate() {
return createdate;
}
public void setCreatedate(String createdate) {
this.createdate = createdate;
}
}
6.接下来我们写BookingDao
package dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import entity.Booking;
public class BookingDao extends BaseDao{
public List search(String sql,Object...params){
List list =new ArrayList();
Connection conn=this.getconn();
PreparedStatement pst=null;
ResultSet rs=null;
try {
pst=this.prepareStatement(conn, sql, params);
rs=pst.executeQuery();
while(rs.next()){
Booking wor=new Booking();
wor.setId(rs.getInt(1));
wor.setCategoryId(rs.getInt(2));
wor.setTitle(rs.getString(3));
wor.setSummary(rs.getString(4));
wor.setUploaduser(rs.getString(5));
wor.setCreatedate(rs.getString(6));
list.add(wor);
}
} catch (SQLException e) {
e.printStackTrace();
}finally{
closeAll(conn, pst, rs);
}
return list;
}
//查询表
public List findAll(){
String sql="SELECT * FROM `Book`";
return search(sql);
}
//添加方法
public int insert(Booking t){
String str="INSERT INTO `book`(categoryId,title,summary,uploaduser,createdate) VALUE(?,?,?,?,?)";
return executeUpdate(str, new Object[]{t.getCategoryId(),t.getTitle(),t.getSummary(),t.getUploaduser(),t.getCreatedate()});
}
//修改方法
public int update(Booking r){
String sql="UPDATE `book` SET `categoryId`=?,`title`=?,`summary`=?,`uploaduser`=?,`createdate`=? WHERE id=?";
return executeUpdate(sql, new Object[]{r.getCategoryId(),r.getTitle(),r.getSummary(),r.getUploaduser(),r.getCreatedate(),r.getId()});
}
//删除方法
public int delete(Booking e){
String sql="DELETE FROM `book` WHERE id=?";
return executeUpdate(sql, new Object[]{e.getId()});
}
}
7.下面我们写Servlet
1.查询的Servlet
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.BookingDao;
import entity.Booking;
public class selectServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public selectServlet() {
super();
}
/**
* Destruction of the servlet.
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet.
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
/**
* The doPost method of the servlet.
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String opr=request.getParameter("opr");
if(opr==null||opr.equals("list")){
//刷新
BookingDao goodsDao=new BookingDao();
List list=goodsDao.findAll();
request.getSession().setAttribute("list", list);
response.sendRedirect("index.jsp");
}
out.flush();
out.close();
}
/**
* Initialization of the servlet.
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
2.添加的Servlet
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.BookingDao;
import entity.Booking;
public class insertServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public insertServlet() {
super();
}
/**
* Destruction of the servlet.
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet.
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
/**
* The doPost method of the servlet.
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
BookingDao rms=new BookingDao();
int categoryId=Integer.parseInt(request.getParameter("categoryId"));
String title=request.getParameter("title");
String summary=request.getParameter("summary");
String uploaduser=request.getParameter("uploaduser");
String createdate=request.getParameter("createdate");
Booking rm=new Booking();
rm.setCategoryId(categoryId);
rm.setTitle(title);
rm.setSummary(summary);
rm.setUploaduser(uploaduser);
rm.setCreatedate(createdate);
int i=rms.insert(rm);
if(i>0){
out.print("true");
//刷新
List listrm=rms.findAll();
request.getSession().setAttribute("list", listrm);
}else{
out.print("false");
}
out.flush();
out.close();
}
/**
* Initialization of the servlet.
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
3.修改的Servlet
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.BookingDao;
import entity.Booking;
public class updateServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public updateServlet() {
super();
}
/**
* Destruction of the servlet.
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet.
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
/**
* The doPost method of the servlet.
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
BookingDao booking=new BookingDao();
int id=Integer.parseInt(request.getParameter("id"));
int categoryId=Integer.parseInt(request.getParameter("categoryId"));
String title=request.getParameter("title");
String summary=request.getParameter("summary");
String uploaduser=request.getParameter("uploaduser");
String createdate=request.getParameter("createdate");
Booking rm=new Booking();
rm.setId(id);
rm.setCategoryId(categoryId);
rm.setTitle(title);
rm.setSummary(summary);
rm.setUploaduser(uploaduser);
rm.setCreatedate(createdate);
int i=booking.update(rm);
if(i>0){
//刷新
List listrm=booking.findAll();
request.getSession().setAttribute("list", listrm);
out.print("");
}else{
out.print("");
}
out.flush();
out.close();
}
/**
* Initialization of the servlet.
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
4.删除的Servlet
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.BookingDao;
import entity.Booking;
public class deleteServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public deleteServlet() {
super();
}
/**
* Destruction of the servlet.
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet.
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
/**
* The doPost method of the servlet.
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
BookingDao rms=new BookingDao();
Booking rm=new Booking();
int id=Integer.parseInt(request.getParameter("id"));
rm.setId(id);
int i=rms.delete(rm);
if(i>0){
List listrm=rms.findAll();
request.getSession().setAttribute("list", listrm);
out.print("");
}else{
out.print("");
}
out.flush();
out.close();
}
/**
* Initialization of the servlet.
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
} 8.配置web.xml
This is the description of my J2EE component
This is the display name of my J2EE component
selectServlet
servlet.selectServlet
This is the description of my J2EE component
This is the display name of my J2EE component
insertServlet
servlet.insertServlet
This is the description of my J2EE component
This is the display name of my J2EE component
updateServlet
servlet.updateServlet
This is the description of my J2EE component
This is the display name of my J2EE component
deleteServlet
servlet.deleteServlet
This is the description of my J2EE component
This is the display name of my J2EE component
idServlet
servlet.idServlet
selectServlet
/selectServlet
insertServlet
/insertServlet
updateServlet
/updateServlet
deleteServlet
/deleteServlet
idServlet
/idServlet
index.jsp
需要注意的是下面段，在上面是web.xml中比较下面，
9.再次写JSP页面
1.index.jsp 初始界面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
电子图书列表 书品编号 书名 摘要 上传人 上传时间 操作
${gd.categoryId}
${gd.title}
${gd.summary}
${gd.uploaduser}
${gd.createdate }
2.insert.jsp 添加页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
3.Update.jsp 修改页面
(1)这个是修改的主要
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
(2)这个idServlet是我后面出现的BUG,我现在只能给又加了一个Servlet
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class idServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public idServlet() {
super();
}
/**
* Destruction of the servlet.
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet.
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
/**
* The doPost method of the servlet.
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
int id=Integer.parseInt(request.getParameter("id"));
request.getSession().setAttribute("idid", id);
response.sendRedirect("Update.jsp");
out.flush();
out.close();
}
/**
* Initialization of the servlet.
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
9. 最后这个是在浏览器中显示的效果,这个是查询效果,查询全表如下
1.查询
2.增加
3.修改(接下里我们把刚才我们添加的数据修改)
4.删除(这个效果可能不是很明显,但为了界面我还是把它给截图下来了)
我把刚才我们上面操作的添加和修改给删除掉看看效果!
最后，项目运行地址：http://localhost:8080/ebookentry-JDBC/index.jsp 看你的端口是808几了。
好了,这个项目也算了做完了，是个完整的,虽然在往数据库传数据的时候出现了中文乱码，但是我会去调这个BUG的，但至少功能实现了。
以上就是这个项目了，虽然在有些地方大家看到的效果不是很明显，如果本篇文章看了对大家有帮助，麻烦大家点个赞，谢谢，如果对本篇有疑问有出现报错的地方或者是其他问题，加我QQ3506346737(备注：CSDN博客+QQ名字)，很期待您的好友申请，也很期待大家对本篇文章的一些改进建议，谢谢
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