📄 totalcost.jsp

📁 一本jsp自学教材

💻 JSP

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<%@ page contentType="text/html; charset=GBK" %>
<%@ page language="java" %>
<%@ page import= "javax.naming.* "%> 
<%@ page import= "javax.sql.DataSource "%> 
<%@ page import="java.sql.*" %>
<HTML>
<head>
<title>计算存货持有成本</title>
</head>
<BODY>
<%@include file="includeTop.jsp"%>
<%  
   //表名  
  String tableName="product";    
try{
  Context initCtx = new InitialContext(); 
  Context ctx = (Context) initCtx.lookup("java:comp/env"); 
  //获取连接池对象 
  DataSource ds =(DataSource)ctx.lookup("jdbc/rot"); 
  //创建连接
  Connection conn = ds.getConnection(); 
  Statement stmt = conn.createStatement(); 
  String sql=sql="SELECT * FROM "+tableName;
  ResultSet rs = stmt.executeQuery(sql);  
   float totalcost=0;
   while(rs.next())
    {
      int m=rs.getInt("stock");
      float n=rs.getFloat("price");
      totalcost=totalcost+m*n;
    } 
  out.print("所有存货的总持有资本=");
  out.print((long)totalcost+"元");
  rs.close();   
  stmt.close();   
  conn.close();
 }
catch(SQLException e)
  {
   out.print(e.toString()); 
  }  
%>  
</HTML>
</BODY>

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