[英]Querying data from Oracle database using java servlet with Netbeans
從index.jsp代碼中,
statement.executeQuery("select * from fus where tester_num like 'hf60' ") ;
示例我希望“ hf60”是一個變量(用戶輸入),其中USER必須從輸入文本中輸入/寫入數據,然后提交並獲取數據,以便結果為
("select * from fus where tester_num like 'userinput' ")
我應該在哪里插入該代碼,是在InsertServlet .java還是在Index.jsp中? 或制作另一個filename.java代碼? 請幫忙。 謝謝;)
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
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);
}
}
如果您堅持使用此設計,我建議您使用JSTL 。 這提供了一組標簽,用於訪問數據,控制邏輯和執行SQL訪問。
請參見有關標准標記庫和SQL標記的Sun教程。 這比將scriptlet嵌入JSP中要好得多。 就是說,我建議這種方法(或片段)僅用於原型或臨時修復。
使用JSTL,您可以將所有scriptlet替換為以下內容:
<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>
您可以在JSP
訪問請求。 因此,如果要像這樣訪問您的JSP
:
test.jsp?q=userinput
您可以在JSP
:
request.getParameter('userinput');
執行此操作時,應將JSP
代碼轉換為至少使用preparedStatement
:
PreparedStatement ps = connection.prepareStatement("select * from fus where tester_num like ?");
ps.setString(1, "%" + request.getParameter('userinput') + "%");
ResultSet resultSet = ps.executeQuery();
正如tvanfosson所說,您應該從視圖邏輯(JSP)中刪除所有數據庫訪問代碼。 您應該只在JSP中顯示信息,讓Servlet完成所有處理。 我也強烈建議您使用Hibernate之類的OMR框架。
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