当我使用此代码时，我从else子句else {out.println("EROARE");
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page
import="java.sql.*,java.util.*,models.*,database.*,controllers.*"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Inregistrare</title>
</head>
<body>
<%
String user = (String)session.getAttribute("Nick");
String Serie = request.getParameter("Serie");
Class.forName("com.mysql.jdbc.Driver");
try {
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/ppauto","root", "k474lin BLASIC");
Statement st = con.createStatement();
// ResultSet rs;
int i = st.executeUpdate("insert into favorite(IDfav, Producator, Model, Proprietar, An_fabricatie, Combustibil, Culoare, Detalii, User) SELECT Serie, ProducatorM, ModelM, ProprietarM, An_fabricatie, Combustibil, Culoare, Detalii,'"+user+"' from masina where Serie='" + Serie + "'");
if (i > 0) {
// session.setAttribute("Nick", Nick);
response.sendRedirect("succes.jsp");
// out.print("Registration Successfull!"+"<a href='index.jsp'>Go to Login</a>");
} else {
out.println("EROARE");
}
}
catch (Exception ex) {
}
%>
</body>
</html>
当我换行
时int i = st.executeUpdate("insert into favorite(IDfav, Producator, Model, Proprietar, An_fabricatie, Combustibil, Culoare, Detalii, User) SELECT Serie, ProducatorM, ModelM, ProprietarM, An_fabricatie, Combustibil, Culoare, Detalii,'"+user+"' from masina where Serie='" + Serie + "'");
到
int i = st.executeUpdate("insert into favorite(IDfav, Producator, Model, Proprietar, An_fabricatie, Combustibil, Culoare, Detalii, User) SELECT Serie, ProducatorM, ModelM, ProprietarM, An_fabricatie, Combustibil, Culoare, Detalii,'"+user+"' from masina where Serie='17'");
（或DATABASE中的任何数字）它可以工作..
我的问题：如何从表masina列Serie获取数据并使用它，因为来自Serie的每个数字代表一辆汽车而我最喜欢的页面做什么，所以我需要来自serie的数字来添加汽车最喜欢的名单...我不知道你们是否理解我需要的东西，希望你能做到。
这是 cautare.jsp ，我有“收藏夹”
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page
import="java.sql.*,java.util.*,models.*,database.*,controllers.*"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<link href="style.css" rel="stylesheet" type="text/css">
<title>Cauta</title>
</head>
<body>
<div id="content"></div>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="50%"> </td>
<td width="766" valign="top">
<table width="766" border="0" cellspacing="0" cellpadding="0">
<tr>
<td colspan="2" class="top" height="69" valign="top">
<div class="menu">
<a href="indexadmin.jsp">Acasa</a><a href="cautare.jsp">Cauta</a><a href="userCP.jsp">Control Panel</a><a href="logout.jsp">Deconectare</a>
</div>
</td>
</tr>
<tr>
<td>
<h2>Cauta masina</h2>
</td>
</tr>
<tr>
<td>
<form id="filter" method="post">
<label>Producator: </label>
<select name="ProducatorM" id="ProducatorM">
<option value="0">Producator</option>
</select>
<input type="submit" name="cauta" value="Cauta"/>
</form>
</td>
</tr>
<tr>
<td>
<% if (request.getParameter("cauta") != null) {
Masini mc = new Masini();
String p = request.getParameter("ProducatorM");
String m = request.getParameter("ModelM");
String a = request.getParameter("An_fabricatie");
String c = request.getParameter("Combustibil");
String S = request.getParameter("Serie");
Vector <Masina> items = mc.filter(p, m, a, c, S);
Masina m1 = null;
Iterator<Masina> vItr = items.iterator();
System.out.println("items:" + items.size());
%>
<h3 style="margin-top:10px"> Rezultatele cautarii</h3>
<table style="margin-top:10px">
<%
while(vItr.hasNext()) {
m1 = vItr.next();
%>
<tr>
<td valign="top" style="background:#aaa; padding:5px 10px" width="102"><img width="125" height="80" src="images/cars/<%= m1.getPoza() %>" alt="" /></td>
<td width="600px" valign="top" style="background:#eee; padding:5px 10px">
<div style="font-weight:700; color:#000; font-size:14px">
<b>
<%= m1.getProducatorM() %>
<%= m1.getModelM() %>
<%= m1.getAn_fabricatie() %>
<input type="hidden" name="Serie" value="<%=m1.getSerie()%>">
<%= m1.getCombustibil() %></b>
</div>
<div style="font-size:13px; color:#000; margin-top:10px">
<%= m1.getDetalii() %>
<html lang="en">
<head>
<title>Rate</title>
<link rel="stylesheet" href="jquery.rating.css">
<script src="jquery.js"></script>
<script src="jquery.rating.js"></script>
</head>
<body>
<form>
<input type="radio" name="rating" value="1" class="star">
<input type="radio" name="rating" value="2" class="star">
<input type="radio" name="rating" value="3" class="star">
<input type="radio" name="rating" value="4" class="star">
<input type="radio" name="rating" value="5" class="star">
</form>
<a href="addtofav.jsp">Favorite</a>
</body>
</html>
</div>
</td>
</tr>
<% } %>
</table>
<% } %>
</td>
</tr>
</table>
</td>
<td width="50%"> </td>
</tr>
</table>
</body>
</html>
这是类
package controllers;
import java.sql.ResultSet;
import java.sql.SQLException;
//import java.util.ArrayList;
import java.util.Vector;
import models.Masina;
import database.Config;
import database.Database;
public class Masini {
private Database ppauto;
public Masini() {
super();
ppauto = new Database(Config.driverName, Config.connURL, Config.userName,
Config.password);
//conexiunea la baza de date
ppauto.DBManager();
// db.SetConnection();
}
public String getDenumireP(String DenumireP) {
//selecteaza producatorul cu id-ul denumirep
String prod = "";
String selectQuery = "select * from producator where DenumireP = " + DenumireP;
ResultSet rs1 = ppauto.getResultSet(selectQuery);
try {
if (rs1.next()) {
prod = rs1.getString("Tara");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return prod;
}
public String getDenumire(String Denumire) {
//selecteaza modelul cu id-ul denumire
String mod = "";
String selectQuery = "select * from model where Denumire = " + Denumire;
ResultSet rs2 = ppauto.getResultSet(selectQuery);
try {
if (rs2.next()) {
mod = rs2.getString("Caroserie");
}
if (rs2.next()) {
mod = rs2.getString("Producator");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return mod;
}
public String getNick(String Nick) {
//selecteaza proprietarul cu id-ul nick
String prop = "";
String selectQuery = "select * from proprietar where Nick = " + Nick;
ResultSet rs3 = ppauto.getResultSet(selectQuery);
try {
if (rs3.next()) {
prop = rs3.getString("Password");
}
if (rs3.next()) {
prop = rs3.getString("Nume");
}
if (rs3.next()) {
prop = rs3.getString("Prenume");
}
if (rs3.next()) {
prop = rs3.getString("Telefon");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return prop;
}
public String getSerie(int Serie) {
//selecteaza masina cu id-ul serie
String mas = "";
String selectQuery = "select * from masina where Serie = " + Serie;
ResultSet rs4 = ppauto.getResultSet(selectQuery);
try {
if (rs4.next()) {
mas = rs4.getString("ProducatorM");
}
if (rs4.next()) {
mas = rs4.getString("ModelM");
}
if (rs4.next()) {
mas = rs4.getString("ProprietarM");
}
if (rs4.next()) {
mas = rs4.getString("An_fabricatie");
}
if (rs4.next()) {
mas = rs4.getString("Combustibil");
}
if (rs4.next()) {
mas = rs4.getString("Culoare");
}
if (rs4.next()) {
mas = rs4.getString("Detalii");
}
if (rs4.next()) {
mas = rs4.getString("Poza");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return mas;
}
// selecteaza 4 anunturi pentru afisare pe prima pagina - random
public Vector<Masina> getForHomepage() {
Vector<Masina> results = null ;
Masina m = null;
String ProducatorM;
String ModelM;
String ProprietarM;
String An_fabricatie;
String Combustibil;
String Culoare;
String Detalii;
String Poza;
try {
String selectQuery = "select * from masina order by rand() limit 4";
ResultSet rs = ppauto.getResultSet(selectQuery);
System.out.println(rs);
try {
results = new Vector<Masina>();
while (rs.next()) {
int Serie = rs.getInt("Serie");
System.out.println("Serie:" + Serie);
ProducatorM = rs.getString("ProducatorM");
ModelM = rs.getString("ModelM");
ProprietarM = rs.getString("ProprietarM");
An_fabricatie = rs.getString("An_fabricatie");
Combustibil = rs.getString("Combustibil");
Culoare = rs.getString("Culoare");
Detalii = rs.getString("Detalii");
Poza = rs.getString("Poza");
m = new Masina(Serie, ProducatorM, ModelM, ProprietarM,
An_fabricatie, Combustibil, Culoare, Detalii, Poza);
results.add(m);
}
} catch (SQLException e) {
// e.printStackTrace();
}
} catch (Exception e) {
}
return results;
}
//realizeaza cautarea
public Vector<Masina> filter(String p, String m, String a, String c, String S) {
String[] conditions = new String[4];
int index = 0;
if (!p.equals("0")) {
conditions[index] = " ProducatorM = '" + p + "'" ;
index++;
}
if (!m.equals("0")) {
conditions[index] = " ModelM = '" + m + "'" ;
index++;
}
if (!a.equals("0")) {
conditions[index] = " An_fabricatie = '" + a + "'";
index++;
}
if (!c.equals("0")) {
conditions[index] = " Combustibil = '" + c + "'" ;
}
String sconditions = "";
int k = conditions.length;
if (k == 0)
return null;
StringBuilder out = new StringBuilder();
out.append(conditions[0]);
for (int x = 1; x < index; ++x) {
out.append(" and ").append(conditions[x]);
}
sconditions = out.toString();
// System.out.println(conditions);
Vector<Masina> results = null;
Masina m1 = null;
String ProducatorM;
String ModelM;
String ProprietarM;
String An_fabricatie;
String Combustibil;
String Culoare;
String Detalii;
String Poza;
try {
String selectQuery = " select * from masina ";
if (sconditions != "") {
selectQuery += " where " + sconditions;
}
System.out.println(selectQuery);
ResultSet rs = ppauto.getResultSet(selectQuery);
System.out.println(rs);
try {
results = new Vector<Masina>();
while (rs.next()) {
int Serie = rs.getInt("Serie");
System.out.println("Serie:" + Serie);
ProducatorM = rs.getString("ProducatorM");
ModelM = rs.getString("ModelM");
ProprietarM = rs.getString("ProprietarM");
An_fabricatie = rs.getString("An_fabricatie");
Combustibil = rs.getString("Combustibil");
Culoare = rs.getString("Culoare");
Detalii = rs.getString("Detalii");
Poza = rs.getString("Poza");
m1 = new Masina(Serie, ProducatorM, ModelM, ProprietarM,
Combustibil, An_fabricatie, Culoare, Detalii, Poza);
results.add(m1);
}
} catch (SQLException e) {
// e.printStackTrace();
}
} catch (Exception e) {
}
return results;
}
}
答案 0 :(得分：0)
我可以回答为什么当我<0时你得到“EROAR”。通过更改该行，您将在调用方法后获得不同的返回值。由于我们无法看到您的方法，我们无法帮助您。
我真的不明白你想要什么。遗憾。