新手,数据库连接问题(高分200)(200分)

  • 主题发起人 主题发起人 wenhong
  • 开始时间 开始时间
W

wenhong

Unregistered / Unconfirmed
GUEST, unregistred user!
我想在WINDOW200中通过JSP连接后台的SQL SERVER200的数据库该怎样进行处理
 
在ASP中通过ADO处理啊
 
<!--首先导入一些必要的packages-->
<!--开始导入packages-->
<%@ page info="database handler"%>
<%@ page import="java.io.*"%>
<%@ page import="java.util.*"%>
<%@ page import="java.sql.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<!--导入结束-->
<%
try
{
//加载驱动程序
//下面的代码为加载JDBD-ODBC驱动程序
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
//建立连接
//第二步是用适当的驱动程序连接到DBMS,看下面的代码:
String url="jdbc:odbc:test";
//"test"是系统dsn名
Connection con=DriverManager.getConnection(url, "administrator", "password");
//"administrator","password"是用户名和口令
//然后创建一个JDBC声明
Statement stmt = con.createStatement();
String query="CREATE TABLE COFFEES" +
"(COF_NAME VARCHAR(32),"+
"SUP_ID INTEGER,"+
"PRICE FLOAT,"+
"SALES INTEGER,"+
"TOTAL INTEGER)";
//执行声明
stmt.executeUpdate(query);
}
catch (Exception e) {}
//输出确认信息
out.println("table coffees created");
%>

 
用JSP和数据库做的购物车的源程序


注意:
1、重新计费部分还没有做好,大家自己动手吧!
2、下一版本将用session做。
//shop_cart.jsp
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page session="true" %>
<%@ page language="java" import="java.sql.*" %>
<jsp:useBean id="bka" scope="page" class="shop.bka" />
<%
String product_type;
String action;
int product_id;
int curpage;
//商品类型
if (request.getParameter("product_type")==null){
product_type="all";
}else
{
product_type=request.getParameter("product_type");
}
//页数和商品类型参数,可以在“继续购物”时返回到上次购物的页面
if (request.getParameter("curpage")==null){
curpage=1;
}else
{
curpage=java.lang.Integer.parseInt(request.getParameter("curpage"));
}
//动作
if (request.getParameter("action")==null){
action="view";
}else
{
action=request.getParameter("action");
}
//商品编号
if (request.getParameter("product_id")==null){
product_id=0;
}else
{
product_id=java.lang.Integer.parseInt(request.getParameter("product_id"));
}
int bbb;
bbb=1;
Integer num = new Integer(bbb);
//商店编号
session.putValue("shop_id",num);
//顾客username
session.putValue("guest_name","asp2001");
String guest_name=(String)session.getValue("guest_name");
Integer shop_id=(Integer)session.getValue("shop_id");

java.lang.String sql;
java.sql.ResultSet rs;

if (action.compareTo("add")==0) {
sql="select cart_quantity from shop_cart where cart_shop_id=" + shop_id + " and cart_guest_id='" + guest_name + "' and cart_product_id=" + product_id ;
rs = bka.executeQuery(sql);
if (rs.next()){
int cart_quantity;
cart_quantity=java.lang.Integer.parseInt(rs.getString("cart_quantity"))+1;
sql="update shop_cart set cart_quantity=" + cart_quantity + " where cart_shop_id=" + shop_id + " and cart_guest_id='" + guest_name + "' and cart_product_id=" + product_id ;
rs = bka.executeQuery(sql);}
else
{
sql="insert into shop_cart (cart_shop_id,cart_guest_id,cart_product_id,cart_quantity) values ('" + shop_id + "','" + guest_name + "','" + product_id + "',1)";
rs = bka.executeQuery(sql);
}
}
if (action.compareTo("clear")==0) {
sql="delete from shop_cart where cart_shop_id=" + shop_id + " and cart_guest_id='" + guest_name + "'";
rs = bka.executeQuery(sql);
}
if (action.compareTo("delete")==0) {
sql="delete from shop_cart where cart_shop_id=" + shop_id + " and cart_guest_id='" + guest_name + "' and cart_product_id=" + product_id ;
rs = bka.executeQuery(sql);
}
%>
<div align="center"><center>
<table border="0" cellpadding="0" cellspacing="0" width="610"
height="2">
<tr>
<td><form method="POST"
action="shop_cart.jsp?action=update&amp;product_type=<%=product_type%>&amp;curp
age=<%=curpage%>">
<table border="0" cellpadding="0" cellspacing="0" width="610"
height="2">
<tr>
<td width="122" height="7"><div align="center"><center><table
border="1" cellpadding="2" cellspacing="0" width="100%" bordercolorlight="#FFB468"
bordercolordark="#FFFFFF" bgcolor="#FFB468">
<tr>
<td width="100%"><div
align="center"><center><p>购物车</td>
</tr>
</table>
</center></div></td>
<td width="122" height="7" style="border: medium"
align="center"><div align="center"><center><table
border="1" cellpadding="2" cellspacing="0" width="100%"
bordercolorlight="#FFB468"
bordercolordark="#FFFFFF" bgcolor="#FFB468">
<tr>
<td width="100%"><div align="center"><center><p><a
href="shop_list.jsp?shop_id=<%=shop_id%>&amp;product_type=<%=product_type%>
&amp;curpage=<%=curpage%>">继续购物</a></td>
</tr>
</table>
</center></div></td>
<td width="122" height="7" style="border: medium"
align="center"><div align="center"><center><table
border="1" cellpadding="2" cellspacing="0" width="100%"
bordercolorlight="#FFB468"
bordercolordark="#FFFFFF" bgcolor="#FFB468">
<tr>
<td width="100%"><div align="center"><center><p><a
href="javascript:do
cument.forms[0].submit()">重新计费</a></td>
</tr>
</table>
</center></div></td>
<td width="122" height="7" style="border: medium"
align="center"><div align="center"><center><table
border="1" cellpadding="2" cellspacing="0" width="100%"
bordercolorlight="#FFB468"
bordercolordark="#FFFFFF" bgcolor="#FFB468">
<tr>
<td width="100%"><div align="center"><center><p><a href="shop_cart.jsp?action=clear&amp;product_type=<%=product_type%>&amp;curpage=<%=curpage%>">清空购物车</a></td>
</tr>
</table>
</center></div></td>
<td width="122" height="7" style="border: medium" align="center"><div align="center"><center><table
border="1" cellpadding="2" cellspacing="0" width="100%" bordercolorlight="#FFB468"
bordercolordark="#FFFFFF" bgcolor="#FFB468">
<tr>
<td width="100%"><div align="center"><center><p><a href="shop_order.asp">确认购买</a></td>
</tr>
</table>
</center></div></td>
</tr>
<tr align="center">
<td width="610" height="1" colspan="5"><div align="center"><center>
<table border="1" cellpadding="2" cellspacing="0" width="100%" bgcolor="#FDFEE2" bordercolorlight="#FFB468" bordercolordark="#FFFFFF" height="40">
<tr>
<td width="20%" height="8" align="left">商品名称</td>
<td width="10%" height="8" align="left">市场价</td>
<td width="10%" height="8" align="left">优惠价</td>
<td width="10%" height="8" align="left">数量</td>
<td width="14%" height="8" align="left">小计</td>
<td width="12%" height="8" align="left">定金比例</td>
<td width="17%" height="8" align="left">定金小计</td>
<td width="17%" height="8" align="left">删除</td>
</tr>
<%
sql="select shop_product.product_id,shop_product.product_name,shop_product.product_price,shop_product.product_discount,shop_cart.cart_quantity,shop_product.product_first from shop_cart,shop_product where shop_cart.cart_shop_id=" + shop_id + " and shop_cart.cart_guest_id='" + guest_name + "' and shop_cart.cart_product_id=shop_product.product_id";
rs = bka.executeQuery(sql);
int total;
int total_first;
total=0;
total_first=0;
String product_name;
int product_price;
int product_discount;
int product_first;
int cart_quantity;
if (rs.next()){
while (rs.next()) {
product_id=java.lang.Integer.parseInt(rs.getString(1));
product_name=rs.getString(2);
product_price=java.lang.Integer.parseInt(rs.getString(3));
product_discount=java.lang.Integer.parseInt(rs.getString(4));
cart_quantity=java.lang.Integer.parseInt(rs.getString(5));
product_first=java.lang.Integer.parseInt(rs.getString(6));
%>
<tr>
<td width="10%" height="1" align="left"><%=product_name%></td>
<td width="10%" height="1" align="left"><%=product_price%></td>
<td width="10%" height="1" align="left"><%=product_discount%></td>
<td width="10%" height="1" align="left"><input type="text" name="<%= "t" + product_id %>" size="3" value="<%=cart_quantity%>"></td>
<td width="14%" height="1" align="left"><%=product_discount*cart_quantity%></td>
<td width="12%" height="1" align="left"><%=product_first + "%"%></td>
<td width="17%" height="1" align="left"><%=product_first*product_discount*cart_quantity/100.0%></td>
<td width="17%" height="1"><div align="center"><center><p><a href="shop_cart.jsp?action=delete&amp;product_id=<%=product_id%>">delete</a></td>
</tr>
<%
total=total+product_discount*cart_quantity;
total_first=total_first+product_discount*cart_quantity*product_first/100;
}
%>
<tr align="center">
<td width="72%" colspan="6" height="16"><div align="right"><p>总计</td>
<td width="36%" colspan="2" height="16"><div align="left"><%=total%></td>
</tr>
<tr align="center">
<td width="72%" colspan="6" height="16"><div align="right"><p>定金总计</td>
<td width="36%" colspan="2" height="16"><div align="left"><%=total_first%></td>
</tr>
<tr align="center">
<td width="72%" colspan="6" height="16"><div align="right"><p>结余</td>
<td width="36%" colspan="2" height="16"><div align="left"><%=total-total_first%></td>
</tr>
</table>
</center></div>
<%
}else
{
%>
<p align="center">购物车为空!</p>
<%
}
%>

数据库操作部分
程序用到两个表:
1 shop_cart表
cart_id int 购物车编号 自动编号
cart_shop_id nvarchar 商店编号
cart_product_id nvarchar 商品编号
cart_quantity int 商品数量
临时存放购物车数据
2 shop_product表
product_id int 商品编号 自动编号
shop_id nvarchar 商店编号
product_name nvarchar 商品名称
product_bb nvarchar 商品介绍
product_price int 市场价
product_discount int 优惠价
product_img img 图片
product_status nvarchar 状态
product_first int 定金比例
product_type nvanchar 商品类型
存放商品资料
使用bka.java制成的javabean:bka.class可以提供对数据库的操作。
另外,需在控制面板的系统DSN中注册bka.dsn,
从而可使JSP通过JDBC-ODBC来调用sql数据库。
在页面中调用javabean,基本上可采用以下方式:

<%@ page language="java" import="java.sql.*" %>
<jsp:useBean id="RegisterBean" scope="page" class="shop.bka" />
<%
String sql="select * from xxx";
ResultSet rs = RegisterBean.executeQuery(sql);
if(rs.next()) {
rs.close();
RegisterBean.closeStmt();
session.putValue("register_message","duplicate name found!");
}
%>
注意应在使用后将rs关闭。

以下是bka.java的源程序。注意在使用前需用javac加以编译成为class文件即javabean.
--shop/bka.java--

package shop;
import java.sql.*;
public class bka {
String sDBDriver = "sun.jdbc.odbc.JdbcOdbcDriver";
String sConnStr = "jdbc:odbc:bka";
Connection conn = null;
ResultSet rs = null;
public bka() {
try {
Class.forName(sDBDriver);
}
catch(java.lang.ClassNotFoundException e) {
System.err.println("bka(): " + e.getMessage());
}
}
public ResultSet executeQuery(String sql) {
rs = null;
try {
conn = DriverManager.getConnection(sConnStr,"xxx","yyy");
Statement stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
}
catch(SQLException ex) {
System.err.println("aq.executeQuery: " + ex.getMessage());
}
return rs;
}
}

 
以上两段代码对你学习jsp有帮助。
我开始的时候就是这样学习的。
 
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
用这样的方法来加载数据库驱动程序已经是老的方法了~~
 
java.sql.Connection对象的每个实例都代表一个单独是数据库连接,通过调用javax.sql.DataSource
类实例的有关方法可以访问数据库连接。
Connection myConn=null;
try {
Context ctx=new InitialContext();
javax.sql.DataSource ds=(javax.sql.DataSource) ctx.lookup("examples-dataSource-demoPool");
java.sql.Connection myConn=ds.getConnection();
} catch (SqlException sqle) {
//Handle the exception
}
上述代码首先查询WebLogic Server的JNDI名字服务,JNDI会告诉我们访问的数据源在什么地方,
然后创建一个java.sql.Connection类的实例,并把ds.getConnection()方法返回的对象赋值给它。
这个方法是获取数据库连接的最好的方法。还有其它一些过时的方法,由于效率不高,不应当
继续使用。例如,应尽量避免使用DriverManager方法。遗憾的是,许多JDBC教科书中还在经常使用这种方法:
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con=DriverManager.getConnection(url, "administrator", "password");
 
DriverManager方法的问题是:
它是一个同步执行的类,这意味着在一个给定的时间内,只有一个线程可以运行。而我们应当尽量使用
多线程的DataSource技术。
 
谢谢各位的回答,现在给分
 
后退
顶部