201819102037 尹凤波
1.创建表单index.jsp
<body> <form method="post" action="register.jsp"> 用户名：<input type="text" name="username"><br> 密码：<input type="text" name="password"><br> 性别：<input type="text" name="gender"><br> 年龄：<input type="text" name="age"><br> <button type="submit">注册</button> </form> </body>2.创建创建JAVABean UserBean.java
package com.media.bean; public class UserBean { private String username; private String password; private int gender; private int age; private int status; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public int getGender() { return gender; } public void setGender(int gender) { this.gender = gender; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public int getStatus() { return status; } public void setStatus(int status) { this.status = status; } }3.创建处理表单register.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <jsp:useBean id="user" class="bean.User"></jsp:useBean> <jsp:setProperty name="user" property="*"></jsp:setProperty> <% Class.forName("com.mysql.jdbc.Driver"); String url="jdbc:mysql://127.0.0.1:3306/book?user=root&password=root"; Connection connection= DriverManager.getConnection(url); String sql="insert into user(username,password,gender,age) values('"+user.getUsername()+"','"+user.getPassword()+"',1,23)"; Statement stmt = connection.createStatement(); int count = stmt.executeUpdate(sql); if(count == 0){ out.print("注册失败"); }else{ out.print("注册成功"); } %> <jsp:getProperty name="user" property="username"/>4.使用Statement实现更改
<%@ page import="java.sql.Connection" %> <%@ page import="java.sql.DriverManager" %> <%@ page import="java.sql.Statement" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <jsp:useBean id="user" class="com.media.bean.UserBean" > </jsp:useBean> <jsp:setProperty name="user" property="*"></jsp:setProperty> <% Class.forName("com.mysql.jdbc.Driver"); String url ="jdbc:mysql://127.0.0.1:3306/book?user=root&password=root"; Connection connection=DriverManager.getConnection(url); Statement stmt=connection.createStatement(); //String sql="insert into user(username,password,gender,age) values('"+user.getUsername()+"','"+user.getPassword()+"',1,23)"; //String sql= "delete from user where id=3"; String sql="update user set status=2 where id=1"; int count=stmt.executeUpdate(sql); if(count==0){ out.print("更新失败"); } else{ out.print("更新成功"); } %>5.使用PreparedStatement实现更改
<%@ page import="java.sql.Connection" %> <%@ page import="java.sql.Driver" %> <%@ page import="java.sql.DriverManager" %> <%@ page import="javax.swing.plaf.nimbus.State" %> <%@ page import="java.sql.Statement" %> <%@ page import="com.mysql.jdbc.PreparedStatement" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <jsp:useBean id="user" class="com.media.bean.UserBean" ></jsp:useBean> <jsp:setProperty name="user" property="*"></jsp:setProperty> <% lass.forName("com.mysql.jdbc.Driver"); String url ="jdbc:mysql://127.0.0.1:3306/book"; Connection connection = DriverManager.getConnection(url,"book","book"); String sql="update user set statius=? where statius=?"; PreparedStatement pstm=connection.prepareStatement(sql); pstm.setString(2,1); %>6.使用Statement实现删除
<%@ page import="java.sql.Connection" %> <%@ page import="java.sql.DriverManager" %> <%@ page import="java.sql.Statement" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <jsp:useBean id="user" class="com.media.bean.UserBean" > </jsp:useBean> <jsp:setProperty name="user" property="*"></jsp:setProperty> <% Class.forName("com.mysql.jdbc.Driver"); String url ="jdbc:mysql://127.0.0.1:3306/book?user=root&password=root"; Connection connection=DriverManager.getConnection(url); Statement stmt=connection.createStatement(); //String sql="insert into user(username,password,gender,age) values('"+user.getUsername()+"','"+user.getPassword()+"',1,23)"; String sql= "delete from user where id=3"; //String sql="update user set status=2 where id=1"; int count=stmt.executeUpdate(sql); if(count==0){ out.print("删除失败"); } else{ out.print("删除成功"); } %>7.使用PreparedStatement实现删除
<% Class.forName("com.mysql.jdbc.Driver")； String url = "jdbc:mysql://localhost:3306/book"； Connection connection = DriverManager.getConnection(url,"root","root"); String sql = "delete from user where id = ? "; PreparedStatement pstm = connection.prepareStatement(sql); pstm.setInt(3); %>
8.使用Statement实现添加
<%@ page import="java.sql.Connection" %> <%@ page import="java.sql.DriverManager" %> <%@ page import="java.sql.Statement" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <jsp:useBean id="user" class="com.media.bean.UserBean" > </jsp:useBean> <jsp:setProperty name="user" property="*"></jsp:setProperty> <% Class.forName("com.mysql.jdbc.Driver"); String url ="jdbc:mysql://127.0.0.1:3306/book?user=root&password=root"; Connection connection=DriverManager.getConnection(url); Statement stmt=connection.createStatement(); String sql="insert into user(username,password,gender,age) values('"+user.getUsername()+"','"+user.getPassword()+"',1,23)"; //String sql= "delete from user where id=3"; //String sql="update user set status=2 where id=1"; int count=stmt.executeUpdate(sql); if(count==0){ out.print("添加失败"); } else{ out.print("添加成功"); } %>9.使用PreparedStatement实现添加
<%@ page import="java.sql.Connection" %> <%@ page import="java.sql.Driver" %> <%@ page import="java.sql.DriverManager" %> <%@ page import="javax.swing.plaf.nimbus.State" %> <%@ page import="java.sql.Statement" %> <%@ page import="com.mysql.jdbc.PreparedStatement" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <jsp:useBean id="user" class="com.media.bean.UserBean" ></jsp:useBean> <jsp:setProperty name="user" property="*"></jsp:setProperty> <% lass.forName("com.mysql.jdbc.Driver")； String url ="jdbc:mysql://127.0.0.1:3306/book"; Connection connection = DriverManager.getConnection(url,"book","book"); String sql = "insert into user(username,password,gender,age) values (?,?,?,?)"; PreparedStatement temt = connection.prepareStatement(sql); temt.setString(1,request.getParameter("username")); temt.setString(2,request.getParameter("password")); temt.setString(3,request.getParameter("gender")); temt.setInt(4,request.getParameter("age")); ResultSet rs = temt.executeQuery(); %>10.使用Statement实现查找
<body> <% Class.forName("com.mysql.jdbc.Driver"); String url ="jdbc:mysql://localhost:3306/book"; Connection connection = DriverManager.getConnection(url,"root","root"); String sql ="select * from user where username =? and password = ?"; PreparedStatement ps =connection.prepareStatement(sql); ps.setString(1,request.getParameter("username")); ps.setString(2,request.getParameter("password")); ResultSet rs =ps.executeQuery(); while (rs.next()){ out.print(rs.getString("username")+"-"+rs.getString(3)+"<br>"); } %> </body>11.使用PreparedStatement实现查找
<%@ page import="java.sql.Connection" %> <%@ page import="java.sql.Driver" %> <%@ page import="java.sql.DriverManager" %> <%@ page import="javax.swing.plaf.nimbus.State" %> <%@ page import="java.sql.Statement" %> <%@ page import="com.mysql.jdbc.PreparedStatement" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <jsp:useBean id="user" class="com.media.bean.UserBean" ></jsp:useBean> <jsp:setProperty name="user" property="*"></jsp:setProperty> <% Statement stmt = connection.createStatement(); String sql = "select * from user where username = '"+request.getParameter("username")+"'"; ResultSet rs = stmt.executeQuery(sql); while (rs.next()){ out.print(rs.getString("username")+"-"+rs.getString(1)+"<br>"); } %>
