添加分类例子

添加分类例子:

数据库语句(Oracle):（如父类’A_1’,子类’A_!_2’）

-- Create table
create table TESTCLASS
(
ID NUMBER not null,
CATE_ID VARCHAR2( 50 ),
CATE_PIDVARCHAR2( 50 ),
CATE_NAME VARCHAR2( 50 )
)
tablespace USERS
pctfree 10
initrans 1
maxtrans 255
storage
(
initial 64 K
minextents 1
maxextents unlimited
);
-- Create/Recreate primary, unique and foreign key constraints
alter table TESTCLASS
add constraint TID_PK primary key (ID)
disable;

Index.jsp

<%@ page language = "java" import = "java.util.*" pageEncoding = "UTF-8" %>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+ "://" +request.getServerName()+ ":" +request.getServerPort()+path+ "/" ;

%>

<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" >

< html >

< head >

< base href = " <%= basePath %> " >

< title > 添加分类测试成功 </ title >

< meta http-equiv = "pragma" content = "no-cache" >

< meta http-equiv = "cache-control" content = "no-cache" >

< meta http-equiv = "expires" content = "0" >

< meta http-equiv = "keywords" content = "keyword1,keyword2,keyword3" >

< meta http-equiv = "description" content = "This is my page" >

<!--

<link rel="stylesheet" type="text/css" href="styles.css">

-->

< script language = "javascript" >

var XMLHttpReq; // 创建XMLHttpRequest对象

function createXMLHttpRequest() {

if (window.XMLHttpRequest) { //Mozilla 浏览器

XMLHttpReq = new XMLHttpRequest();

}

else if (window.ActiveXObject) { // IE 浏览器

try {

XMLHttpReq = new ActiveXObject( "Msxml2.XMLHTTP" );

} catch (e) {

try {

XMLHttpReq = new ActiveXObject( "Microsoft.XMLHTTP" );

} catch (e) {}

}

}

}

// 发送请求函数

function sendRequest() {

createXMLHttpRequest();

var url = "optionsServlet" ;

XMLHttpReq.open( "GET" , url);

XMLHttpReq.onreadystatechange = processResponse; // 指定响应函数

XMLHttpReq.send( null ); // 发送请求

}

// 处理返回信息函数

function processResponse() {

if (XMLHttpReq.readyState == 4) { // 判断对象状态

if (XMLHttpReq.status == 200) { // 信息已经成功返回，开始处理信息

display();

setTimeout( "sendRequest()" , 10000); //10 秒后刷新

} else { // 页面不正常

window.alert( " 您所请求的页面有异常。" );

}

}

}

// 显示更新数据信息的函数

function display() {

var optionsText = XMLHttpReq.responseText;

document.getElementById( "selects" ).innerHTML = optionsText;

}

</ script >

</ head >

< body onload = "sendRequest()" >

<!-- 注意：<option>选项改为动态显示就行<option> -->

< center > 添加分类 </ center >

< form action = "test/addShow.jsp" name = "form1" method = "post" >

< table width = "35%" border = "0" align = "center" class = "maintbbg" cellspacing = "1" cellpadding = "0" >

< tr class = "maintbtr3" height = 25 >

< td >

< div align = "right" > 用户分类名： </ div >

</ td >

< td > &nbsp; < input TYPE = "text" NAME = "cate_name" class = "input" ></ td >

&nbsp;

< div id = "selects" name = "selects" ></ div >

</ tr >

< tr >

< td > < input TYPE = "submit" name = " 提交" value = " 提交" /></ td >

</ tr >

</ table >

</ form >

</ body >

</ html >

addShow.jsp

<%@ page language = "java" import = "java.util.*" pageEncoding = "UTF-8" %>

<%@ page import = "cc.yiyao.dbConn.JdbcUtil,java.sql.*" %>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+ "://" +request.getServerName()+ ":" +request.getServerPort()+path+ "/" ;

%>

<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" >

< html >

< head >

< base href = " <%= basePath %> " >

< title > My JSP 'addShow.jsp' starting page </ title >

< meta http-equiv = "pragma" content = "no-cache" >

< meta http-equiv = "cache-control" content = "no-cache" >

< meta http-equiv = "expires" content = "0" >

< meta http-equiv = "keywords" content = "keyword1,keyword2,keyword3" >

< meta http-equiv = "description" content = "This is my page" >

<!--

<link rel="stylesheet" type="text/css" href="styles.css">

-->

</ head >

< body >

<%

Connection conn = JdbcUtil.getConnection();

conn.setAutoCommit( false );

Statement stmt = conn.createStatement();

String dbCate_id = "" ; // 将来数据库中插入的字段

String temp_cateid = "" ;

String cate_pid = request.getParameter( "cate_pid" );

String sqlSel = "select * from testClass where cate_pid = '" +cate_pid+ "' order by id desc" ; //( 实际上只要返回一条记录,不过oracle不能用top1

ResultSet rs = null ;

rs= stmt.executeQuery(sqlSel);

if (rs.next()){ // 有相同类别的数据,取出最大值，再加上1;

temp_cateid = rs.getString( "cate_id" );

// 分离出数字,后再加1,如A_2_1,分离出最后一个数字，再加1。

int k = temp_cateid.lastIndexOf( "_" );

// 获得最后一部分的数字

String strLastPart = temp_cateid.substring(k+1,temp_cateid.length());

out.println( "strLastPart=" +strLastPart);

// 获得字符串的前一部分

String strFirstPart = temp_cateid.substring(0,k+1);

out.println( "strFirstPart=" +strFirstPart);

// 将最后的数字加1,最后合起来

dbCate_id = strFirstPart + (Integer.parseInt(strLastPart)+1);

out.println( "dbCate_id" +dbCate_id);

} else {

// 没有相同类别的数据，初始化开始值

if (!cate_pid.equals( "0" )){ // 没有相同类别的数据(开始的子类别为父类别+”_1"，初始化开始值(select 中以"0"为开始,没有相同类别又等于0说明数据库中都没有数据)

dbCate_id = cate_pid+ "_1" ;

} else { // 说明数据库未插入 //select 中以"0"为开始,没有相同类别又等于0说明数据库中都没有数据

dbCate_id = "A_1" ;

}

}

String className = request.getParameter( "cate_name" );

String sql = "insert into testClass values (5,'" +dbCate_id+ "','" +cate_pid+ "','" +className+ "')" ;

stmt.executeUpdate(sql);

conn.commit();

conn.setAutoCommit( true );

out.println( "dbCate_id2" +dbCate_id);

if (stmt!= null ) {

stmt.close();

}

if (conn!= null ) {

conn.close();

}

%>

</ body >

</ html >

Servlet:

package test;

import java.io.IOException;

import java.io.PrintWriter;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class RefreshOptionsServlet extends HttpServlet {

public RefreshOptionsServlet() {

super();

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html;charset=gb2312");

response.setHeader("Cache-Control", "no-cache");//注意设置页面不缓存，不然就看不到刷新的效果了！！

PrintWriter out = response.getWriter();

StringBuffer optionsText = new StringBuffer("");

Connection conn = null;

try {

Class.forName("oracle.jdbc.driver.OracleDriver");

conn = DriverManager.getConnection(

"jdbc:oracle:thin:@localhost:1521:Oracle1",

"system",

"system"

);

Statement stmt = conn.createStatement();

String sql = "select * from testClass";//sql = "select * from testClass where cate_pid = 0";

ResultSet rs = null;

rs = stmt.executeQuery(sql);

String cate_pid = ""; //父编号

String cate_name = ""; //名称

String cate_id = ""; //编号

String sql2 = "select * from testClass where cate_pid='";

optionsText = optionsText.append("<select name='cate_pid'><option value='0'>无</option>");

while(rs.next()){

cate_id = rs.getString("cate_id");

cate_name = rs.getString("cate_name");

cate_pid = rs.getString("cate_pid");

optionsText = optionsText.append("<option value='"+cate_id+"'>"+cate_name+"</option>");

}

} catch (ClassNotFoundException e) {

e.p

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• 2007-08-02 16:41
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