课上

实现增删改查
首先是增加和删除
建立Java Bean文件
user.java

 

 

 

 建立index.jsp 

建立连接jsp文件 register.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<jsp:useBean id="user" class="com.name.user">

</jsp:useBean>

<jsp:setProperty name="user" property="*"></jsp:setProperty>

<%
    //user userbean = new user();
    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 = "delete from user where id=12";

    Statement stmt = connection.createStatement();

    int count = stmt.executeUpdate(sql);

    if(count == 0){
        out.print("删除成功");
    }else{
        out.print("删除失败");
    }

%>

改和删