tomcat5.0+MS Access数据库连接问题连接问题。。解决问题就结贴。谢谢
tomcat5.0通过JDBC-ODBC bridge和MS Access数据库连接问题。首先建立一个Access数据库faq.mdb,其中的表faqs有字段id(自动增量型,并设为主关键字)、subject(文字型,长度200)、answers(备注型)。这个表中可以存放一些编程知识的常见问题及答案,
然后,在Control Panel(控制面板)的ODBC Datasource模块中加入System DSN,取名faq,并指向faq.mdb。 创建一个JavaBean,名为faq.java,并保存在jswdk-1.0.1webpagesWEB-INFjspeans est目录下。faq.java 的内容如下:
package test;
import java.sql.*;
public class faq {
String sDBDriver = "sun.jdbc.odbc.JdbcOdbcDriver";
String sConnStr = "jdbc:odbc:faq";
Connection conn = null;
ResultSet rs = null;
public faq() {
try {
Class.forName(sDBDriver);
}
catch(java.lang.ClassNotFoundException e) {
System.err.println("faq(): " + e.getMessage());
}
}
public ResultSet executeQuery(String sql) {
rs = null;
try {
conn = DriverManager.getConnection(sConnStr);
Statement stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
}
catch(SQLException ex) {
System.err.println("aq.executeQuery: " + ex.getMessage());
}
return rs;
}
}
编译faq.java以后生成faq.class,在jswdk-1.0.1webpages est目录下创建JSP文件faq.jsp,其内容如下:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>我的FAQ !</title>
</head>
<body>
<p><b>这是我的FAQ!</b></p>
<%@ page language="java" import="java.sql.*" %>
<jsp:useBean id="workM" scope="page" class="test.faq" />
<%
ResultSet RS = workM.executeQuery("SELECT * FROM faqs");
String tt;
while (RS.next()) {
tt = RS.getString("Answer");
out.print("<LI>" + RS.getString("Subject") + "</LI>");
out.print("<pre>" + tt + "</pre>");
}
RS.close();
%>
在浏览器的地址栏中键入http://localhost:8080/test/faq.jsp,faq.jsp调用JavaBean,从数据库中读出内容并输出.
结果提示如下,不知道什么原因:谢谢
HTTP Status 500 -
--------------------------------------------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Column not found
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:673)
org.apache.jsp.faq_jsp._jspService(faq_jsp.java:84)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
root cause
java.sql.SQLException: Column not found
sun.jdbc.odbc.JdbcOdbcResultSet.findColumn(Unknown Source)
sun.jdbc.odbc.JdbcOdbcResultSet.getString(Unknown Source)
org.apache.jsp.faq_jsp._jspService(faq_jsp.java:72)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
note The full stack trace of the root cause is available in the Tomcat logs.
--------------------------------------------------------------------------------