如何將JSP連接到MS訪問數據庫？

我在使用以下JSP代碼創建表時遇到問題。該錯誤與我的代碼的第17行有關。我已經包含了我得到的錯誤以及我的代碼。任何幫助深表感謝！如何將JSP連接到MS訪問數據庫？

我的代碼

<%@ page import="java.sql.*" %> 
<% 
String url = "jdbc:odbc:productDSN"; 
String username=""; 
String password=""; 
Connection conn=null; 
String classpath = "sun.jdbc.odbc.JdbcOdbcDriver"; 
try{ 
    Class.forName(classpath); 
    conn = DriverManager.getConnection(url,username,password); 
    }catch(Exception exc){ 
    out.println(exc.toString()); 
} 

%> 
<% 
    Statement stm= conn.createStatement(); 
    String query1, query2; 
    query1="CREATE TABLE product(id char(3) PRIMARY KEY,"+ 
      "name varchar(15),model varchar(5), price float,"+ 
      "manufacturerID integer)"; 
    query2="CREATE TABLE manufacturer("+ 
    "manufacturerID integer PRIMARY KEY,"+ 
     "name varchar(15),address varchar(20), city varchar(20),"+ 
     "state varchar(15), zipCode char(5), phone varchar(15))"; 
try{ 
stm.executeUpdate(query1); 
stm.executeUpdate(query2); 

    out.println("Two tables were successfully created."); 
}catch(Exception exc){ 
    out.println("These tables exist already."); 
} 
stm.close(); 
conn.close(); 
%>

錯誤

HTTP Status 500 - 

type Exception report 

message 

description The server encountered an internal error() that prevented it from fulfilling this request. 

exception 

org.apache.jasper.JasperException: An exception occurred processing JSP page /example1.jsp at line 17 

14: 
15: %> 
16: <% 
17:  Statement stm= conn.createStatement(); 
18:  String query1, query2; 
19:  query1="CREATE TABLE product(id char(3) PRIMARY KEY,"+ 
20:   "name varchar(15),model varchar(5), price float,"+ 


Stacktrace: 
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:567) 
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:471) 
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389) 
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
root cause 

java.lang.NullPointerException 
    org.apache.jsp.example1_jsp._jspService(example1_jsp.java:82) 
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433) 
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389) 
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.21 logs. 

Apache Tomcat/7.0.21

來源

2012-04-17 ajj

請注意，請勿使用scriptlets'：'（'http://stackoverflow.com/a/3180202/139010 – 2012-04-17 00:53:39

@ajj您的Datasource'productDSN'指向哪裏，您是否創建了Excel電子表格填充？以及你在哪裏保存了它？ – mykey 2012-04-17 07:56:20

你Connection是NULL

您是否製作DSN？如果沒有，則創建System DSN，然後重試。

來源

2012-04-17 04:28:12

如何將JSP連接到MS訪問數據庫？

回答

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