Java web 4-9
<%@ page language="java" import="java.sql.*" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>修改编辑页面</title>
</head>
<body>
<%
request.setCharacterEncoding("UTF-8");
String driverName= "com.mysql.jdbc.Driver";
String userName="root";
String userPwd="147258369";
String dbName="students";
String url1="jdbc:mysql://localhost:3306/"+dbName;
String url2="?user="+userName+"&password="+userPwd;
String url3="&useUnicode=true&characterEncoding=UTF-8";
String url=url1+url2+url3;
Class.forName(driverName);
Connection conn=DriverManager.getConnection(url);
String name=request.getParameter("name");
String sex=request.getParameter("sex");
String ww1=request.getParameter("w1");
String ww2=request.getParameter("w2");
String s="1=1 ";
if(!name.equals(""))s=s+"and name='"+name+"'";
if(sex!=null)s=s+"and sex='"+sex+"'";
float w1,w2;
if(!ww1.equals("")){w1=Float.parseFloat(ww1);s=s+"and weight >="+w1;}
if(!ww2.equals("")){w2=Float.parseFloat(ww2);s=s+"and weight <="+w2;}
String sql="delete from students_info where "+s;
PreparedStatement pstmt=conn.prepareStatement(sql);
int n=pstmt.executeUpdate();
if(n==1){%>数据删除操作成功！<br><%}
else{%>数据删除操作失败！ <br><%}
if(pstmt!=null){pstmt.close();}
if(conn!=null){conn.close();}
%>
</body>
</html>
