使用Java Servlet和Netbeans从Oracle数据库查询数据
[英]Querying data from Oracle database using java servlet with Netbeans
问题描述
From index.jsp code, 
从index.jsp代码中，
statement.executeQuery("select * from fus where tester_num like 'hf60' ") ;
Example I want "hf60" to be a variable(userinput), wherein USER must input/write data from input text then submit and get the data so that the result will be 示例我希望“ hf60”是一个变量（用户输入），其中USER必须从输入文本中输入/写入数据，然后提交并获取数据，以便结果为
("select * from fus where tester_num like 'userinput' ")
Where should I insert that code, Is it in InsertServlet .java or in Index.jsp.? 我应该在哪里插入该代码，是在InsertServlet .java还是在Index.jsp中？ or make another filename.java code? 或制作另一个filename.java代码？ Please help. 请帮忙。 Thanks;) 谢谢;）
Index.jsp 的index.jsp
<%@ page import="java.sql.*" %>
<% Class.forName("oracle.jdbc.driver.OracleDriver"); %>
<HTML>
<HEAD>
<TITLE>SHIFT REPORT </TITLE>
</HEAD>
<BODY BGCOLOR=##342D7E>
<CENTER>
<H2><FONT COLOR="#ECD672" FACE="Verdana" >SHIFT REPORT</FONT></H2></CENTER>
<hr>
<%
Connection connection=DriverManager.getConnection ("jdbc:oracle:thin:@oradev2.*****.com:1521:RPADB","shift_admin", //
"shift_admin"
);
Statement statement = connection.createStatement() ;
//**Should I input the codes here?**
ResultSet resultset =
statement.executeQuery("select * from fus where tester_num like 'hf60") ;
%>
<TABLE BORDER="1" BGCOLOR="CCFFFF" width='200%' cellspacing='1' cellpadding='0' bordercolor="black" border='1'>
<TR>
<TH bgcolor='#DAA520'> <font size='2'>RECORD NUMBER</TH>
<TH bgcolor='#DAA520'><font size='2'>TESTER NUMBER</TH>
<TH bgcolor='#DAA520'><font size='2'>DATE</TH>
<TH bgcolor='#DAA520'><font size='2'>TIME</TH>
<TH bgcolor='#DAA520'><font size='2'>SYSTEM TYPE</TH>
<TH bgcolor='#DAA520'><font size='2'>PACKAGE</TH>
<TH bgcolor='#DAA520'><font size='2'>SOCKETS</TH>
<TH bgcolor='#DAA520'><font size='2'>VALIDATED BY</TH>
</TR>
<% while(resultset.next()){ %>
<TR>
<TD> <font size='2'><center><%= resultset.getLong(1) %></center></TD>
<TD> <font size='2'><center><%= resultset.getString(2) %></center></TD>
<TD> <font size='2'><center><%= resultset.getDate(3) %></center></TD>
<TD> <font size='2'><center><%= resultset.getString(4) %></center></TD>
<TD> <font size='2'><center><%= resultset.getString(5) %></center></TD>
<TD> <font size='2'><center><%= resultset.getString(6) %></center></TD>
<TD> <font size='2'><center><%= resultset.getString(7) %></center></TD>
<TD> <font size='2'><center><%= resultset.getString(8) %></center></TD>
</TR>
<% } %>
</TABLE>
</BODY>
</HTML>
InsertServlet.java InsertServlet.java
package fusion.shift.servlets.db;
import java.sql.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class InsertServlet extends HttpServlet {
public void init(ServletConfig config) throws ServletException {
super.init(config);
}
public void destroy() {
}
public boolean processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
String rec_num = request.getParameter("rec_num");
String tester_num = request.getParameter("tester_num");
String t_date = request.getParameter("t_date");
String t_time = request.getParameter("t_time");
String sys_type = request.getParameter("sys_type");
String packages = request.getParameter("package");
String sockets = request.getParameter("sockets");
String sockets = request.getParameter("val");
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
PreparedStatement ps = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
con=DriverManager.getConnection("jdbc:oracle:thin:@oradev2.*****.com:1521:RPADB","shift_admin", //
"shift_admin"
);
String sql;
sql = "INSERT INTO fusion_shiftrpt(RECORD_NUM, TESTER_NUM, T_DATE, T_TIME, SYSTEM_TYPE, PACKAGE, SOCKETS,VAL) VALUES (?,?,?,?,?,?,?,?)";
ps = con.prepareStatement(sql);
stmt = con.createStatement();
ps.setString(1, rec_num);
.0+ ps.setString(2, tester_num);
ps.setString(3, t_date);
ps.setString(4, t_time);
ps.setString(5, sys_type);
ps.setString(6, packages);
ps.setString(7, sockets);
ps.setString(8, val);
ps.executeUpdate();
} catch (SQLException e) {
throw new ServletException(e);
} catch (ClassNotFoundException e) {
throw new ServletException(e);
} finally {
try {
if(rs != null)
rs.close();
if(stmt != null)
stmt.close();
if(ps != null)
ps.close();
if(con != null)
con.close();
} catch (SQLException e) {}
}
return(true);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request,response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request,response);
//String url = request.getRequestURI();
//System.out.println(url);
}
}
3 个解决方案
解决方案1
4 2008-12-02 16:43:43
If you insist on staying with this design, I would suggest that you use JSTL . 如果您坚持使用此设计，我建议您使用JSTL 。 This provides a set of tags for accessing data, controlling logic, and performing SQL access. 这提供了一组标签，用于访问数据，控制逻辑和执行SQL访问。
See the Sun Tutorial on the Standard Tag Library and the SQL tags . 请参见有关标准标记库和SQL标记的Sun教程。 This is a much better approach than embedding scriptlets into your JSP. 这比将scriptlet嵌入JSP中要好得多。 That said, I would recommend this approach (or scriplets) only be used for prototypes or as a very-temporary fix. 就是说，我建议这种方法（或片段）仅用于原型或临时修复。
With JSTL, you could replace all of the scriptlets with something similar to: 使用JSTL，您可以将所有scriptlet替换为以下内容：
<sql:query var="rows" >
select * from fus where tester_num like ?
<sql:param value="${param.user_input}" />
</sql:query>
<table>
<c:forEach var="row" items="${rows}">
<tr>
<td>${row.column1name}</td>
<td>${row.column2name}</td>
<td>${row.column3name}</td>
</tr>
</c:forEach>
</table>
解决方案2
2 2008-11-27 12:14:05
You have access to the request in a JSP . 您可以在JSP访问请求。 So if your JSP were to be accessed like this: 因此，如果要像这样访问您的JSP ：
test.jsp?q=userinput
You could get to it like this in the JSP : 您可以在JSP ：
request.getParameter('userinput');
You should convert your JSP code to at least use a preparedStatement when you do this: 执行此操作时，应将JSP代码转换为至少使用preparedStatement ：
PreparedStatement ps = connection.prepareStatement("select * from fus where tester_num like ?");
ps.setString(1, "%" + request.getParameter('userinput') + "%");
ResultSet resultSet = ps.executeQuery();
解决方案3
0
As tvanfosson said, you should remove all database access code from your view logic (JSP). 正如tvanfosson所说，您应该从视图逻辑（JSP）中删除所有数据库访问代码。 You should just show the info in your JSP, let the Servlet do all the processing. 您应该只在JSP中显示信息，让Servlet完成所有处理。 I also strongly recommend you to use an OMR framework like Hibernate. 我也强烈建议您使用Hibernate之类的OMR框架。
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.