I wanted to do multitable search.I have a database in MS Access with 4 tables.So I made 1 more table Index1 which contains the field from all the 4 tables that the user will search.(sort of index/master table). The problem is that the search is not displaying as many records as ideally it should,It displays only few of them. Kindly enlighten me by finding the bug in my code. Thanks in advance !
My code:
//package searchbook;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;
public class SearchBook extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
HttpSession session = request.getSession(true);
List booklist = new ArrayList();
Connection con = null;
String url = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb, *.accdb)};DBQ=" + "C:\\users\\ppreeti\\executive_db.accdb";
String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
String user = "";
String pass = "";
String category = "";
category = request.getParameter("input");
String sqlquery = "select Index1.link_id "
+ "FROM Index1 "
+ " WHERE Index1.index_name LIKE '%" + category + "%' ";
String sqlResult = null;
try {
Class.forName(driver);
con = DriverManager.getConnection(url, user, pass);
try {
Statement st = con.createStatement();
System.out.println("Connection created 1");
ResultSet rs = st.executeQuery(sqlquery);
while (rs.next()) {
sqlResult = rs.getString(1);
}
System.out.println("Result retreived 1");
//System.out.println('"sqlquery"');
} catch (SQLException s) {
System.out.println("SQL statement is not executed! " + s);
}
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("************");
String sqlq = "";
int flag = 0;
/*if(sqlResult.equals("1"))
{
flag=1;
System.out.println("entered if block for section!");
sqlq="select Report.Report_Name,Report.Report_ID,Report.Section_ID,Report.Contact_ID,Report.link_id FROM Report "
+ " where Report.Report_Name LIKE '%"+category+"%' ";
sqlq="select Section.Section_Name , Report.Report_Name , Report.Link, Contact.Contact_Name "
+ "FROM Section , Report , Contact"
+ " WHERE Report.Section_ID=Section.Section_ID and Contact.Contact_ID=Report.Report_ID "
+ "and Section.Section_Name = '"+category+"' ";
} */
if (sqlResult.equals("1")) {
flag = 1;
System.out.println("entered if block for section!");
/*sqlq="select Report.Report_Name,Report.Report_ID,Report.Section_ID,Report.Contact_ID,Report.link_id FROM Report "
+ " where Report.Report_Name LIKE '%"+category+"%' ";*/
sqlq = "select distinct Section.Section_Name , Report.Report_Name , Report.Link, Contact.Contact_Name "
+ "FROM Section , Report , Contact"
+ " WHERE Report.Section_ID=Section.Section_ID and Contact.Contact_ID=Report.Contact_ID and Section.Section_Name LIKE '%" + category + "%' ";
// + "and Section.Section_Name = '"+category+"' ";
}
if (sqlResult.equals("2")) {
flag = 1;
System.out.println("entered if block for report!");
/*sqlq="select Report.Report_Name,Report.Report_ID,Report.Section_ID,Report.Contact_ID,Report.link_id FROM Report "
+ " where Report.Report_Name LIKE '%"+category+"%' ";*/
sqlq = "select distinct Section.Section_Name , Report.Report_Name , Report.Link, Contact.Contact_Name "
+ "FROM Section , Report , Contact"
+ " WHERE Report.Section_ID=Section.Section_ID and Contact.Contact_ID=Report.Contact_ID and Report.Report_Name LIKE '%" + category + "%' ";
// + "and Report.Report_Name = '"+category+"' ";
}
if (sqlResult.equals("3")) {
flag = 1;
System.out.println("entered if block for metrics !");
/*sqlq="select Report.Report_Name,Report.Report_ID,Report.Section_ID,Report.Contact_ID,Report.link_id FROM Report "
+ " where Report.Report_Name LIKE '%"+category+"%' "*/
;
sqlq = "select distinct Section.Section_Name , Report.Report_Name , Report.Link, Contact.Contact_Name "
+ "FROM Section , Report , Contact,Metrics"
+ " WHERE Report.Section_ID=Section.Section_ID and Contact.Contact_ID=Report.Contact_ID and Metrics.Report_ID=Report.Report_ID "
+ "and Metrics.Metric_Name LIKE '%" + category + "%' ";
}
if (sqlResult.equals("4")) {
flag = 1;
System.out.println("entered if block for contact name!");
/*sqlq="select Section.Section_Name , Report.Report_Name , Report.Link, Contact.Contact_Name, Metrics.Metric_Name "
+ "FROM Section , Report , Contact, Metrics"
+ " WHERE Report.Section_ID=Section.Section_ID and Metrics.Report_ID=Report.Report_ID "
+ "and Report.Report_ID IN (SELECT Report.Report_ID FROM Report WHERE "
+ "Contact.Contact_ID=Report.Contact_ID and Contact.Contact_Name LIKE '%"+category+"%' and Metrics.Metric_Segment = 'M') ORDER BY Report_Name ";*/
sqlq = "select distinct Section.Section_Name , Report.Report_Name , Report.Link, Contact.Contact_Name "
+ "FROM Section , Report , Contact"
+ " WHERE Report.Section_ID=Section.Section_ID and Contact.Contact_ID=Report.Contact_ID "
+ "and Contact.Contact_Name LIKE '%" + category + "%' ";
}
if (flag == 1) {
try {
Class.forName(driver);
con = DriverManager.getConnection(url, user, pass);
try {
Statement st = con.createStatement();
System.out.println("Connection created");
ResultSet rs = st.executeQuery(sqlq);
System.out.println("Result retreived for 2nd query ");
while (rs.next()) {
List<String> book = new ArrayList<String>();
String Name = rs.getString("Section_Name");
String reportName = rs.getString("Report_Name");
String link = rs.getString("Link");
String contactName = rs.getString("Contact_Name");
/* String metricName=rs.getString("Metric_Name");*/
//String reportId=rs.getString("Report_ID");
book.add(Name);
book.add(reportName);
book.add(link);
book.add(contactName);
/* book.add(metricName);*/
//book.add(reportId);
/* book.add(ind_id);
book.add(ind_name);*/
booklist.add(book);
}
} catch (SQLException s) {
s.printStackTrace();
System.out.println("SQL statement is not executed in 2nd query! " + s);
}
} catch (Exception e) {
e.printStackTrace();
}
}
System.out.println("And it came here lastly !");
request.setAttribute("booklist", booklist);
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/searchbook.jsp");
dispatcher.forward(request, response);
System.out.println("***************************************************************************************");
}
}
Check your logic again. In this loop
while (rs.next()) {
sqlResult = rs.getString(1);
}
you are looping through the first ResultSet, repeatedly assigning
sqlResult = rs.getString(1);
and then doing nothing with it until you hit the end of that while loop, after which you proceed to do some other stuff with the last row fetched by that first query.
Access works different. Use "*" instead of "%" for the like.
Related
I am trying to write a method in jdbc in order to update some columns in my database (postgresql)
Here is what I have written so far:`
public void showRoomBookings(int clientID) {
Scanner myObj = new Scanner(System.in);
Statement st;
try {
st = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
ResultSet res = st.executeQuery("SELECT rb.\"hotelbookingID\",rb.\"roomID\",rb.\"bookedforpersonID\",rb.checkin,rb.checkout,rb.rate\r\n"
+ "FROM roombooking rb ,hotelbooking hb\r\n"
+ "where rb.\"bookedforpersonID\"=hb.\"bookedbyclientID\"\r\n"
+ "AND hb.\"bookedbyclientID\"="+clientID+"\r\n"
+ "order by rb.\"hotelbookingID\"");
int j=1;
while(res.next()) {
System.out.println(j+")roomID:"+res.getInt(2)
+" bookedforpersonID:"+res.getInt(3)+" checkin:"+res.getDate(4)+" checkout:"+res.getDate(5)
+" rate:"+res.getInt(6));
j++;
}
System.out.println("Enter the number of the room you want to update:");
int answer = myObj.nextInt();
ResultSet res1 = st.executeQuery("Select t2.\"hotelbookingID\",t2.\"roomID\",t2.\"bookedforpersonID\",t2.checkin,t2.checkout,t2.rate\r\n"
+ "From \r\n"
+ "(\r\n"
+ " Select \r\n"
+ " Row_Number() Over (Order By t1.\"hotelbookingID\") As RowNum\r\n"
+ " , *\r\n"
+ " From (\r\n"
+ "SELECT rb.\"hotelbookingID\",rb.\"roomID\",rb.\"bookedforpersonID\",rb.checkin,rb.checkout,rb.rate\r\n"
+ "FROM roombooking rb ,hotelbooking hb\r\n"
+ "where rb.\"bookedforpersonID\"=hb.\"bookedbyclientID\"\r\n"
+ "AND hb.\"bookedbyclientID\"=107\r\n"
+ "order by rb.\"hotelbookingID\"\r\n"
+ " )t1\r\n"
+ ") t2\r\n"
+ "Where RowNum = "+answer);
System.out.println("You chose room: ("+answer+")");
while(res1.next()) {
System.out.println(res1.getInt(1)+" roomID:"+res1.getInt(2)
+" bookedforpersonID:"+res1.getInt(3)+" checkin:"+res1.getDate(4)+" checkout:"+res1.getDate(5)
+" rate:"+res1.getInt(6));
res1.updateInt("rate", 40);
res1.updateRow();
}
res.close();
res1.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
In the first ResultSet res I just project the roombookings bases on the clientID and then with ResultSet res1 I choose one of them. My console looks like this:
The problem here is that when I try to update rate :
res1.updateInt("rate", 40);
res1.updateRow();
I get the following message:
org.postgresql.util.PSQLException: ERROR: syntax error at or near "("
Position: 8 at
postgresql#42.2.20.jre7/org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2553)
at
postgresql#42.2.20.jre7/org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2285)
at
postgresql#42.2.20.jre7/org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:323)
at
postgresql#42.2.20.jre7/org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:481)
at
postgresql#42.2.20.jre7/org.postgresql.jdbc.PgStatement.execute(PgStatement.java:401)
at
postgresql#42.2.20.jre7/org.postgresql.jdbc.PgPreparedStatement.executeWithFlags(PgPreparedStatement.java:164)
at
postgresql#42.2.20.jre7/org.postgresql.jdbc.PgPreparedStatement.executeUpdate(PgPreparedStatement.java:130)
at
postgresql#42.2.20.jre7/org.postgresql.jdbc.PgResultSet.updateRow(PgResultSet.java:1445)
at lol.DbApp.showRoomBookingss(DbApp.java:246) at
lol.DbApp.main(DbApp.java:290)
Here is my postgresql final result(the same as the last line from the console above):
EDIT: SQL CODE:
Select
t2."hotelbookingID",
t2."roomID",
t2."bookedforpersonID",
t2.checkin,
t2.checkout,
t2.rate
From(
Select
Row_Number() Over (
Order By
t1."hotelbookingID"
) As RowNum,
*
From
(
SELECT
rb."hotelbookingID",
rb."roomID",
rb."bookedforpersonID",
rb.checkin,
rb.checkout,
rb.rate
FROM
roombooking rb,
hotelbooking hb
WHERE
rb."bookedforpersonID" = hb."bookedbyclientID"
AND hb."bookedbyclientID" = 107
order by
rb."hotelbookingID"
) t1
) t2
Where
RowNum = 3
group by
t2."hotelbookingID",
t2."roomID",
t2."bookedforpersonID",
t2.checkin,
t2.checkout,
t2.rate
Any help would be valuable.
This is of course parts of a larger code. It will compile with no problem, but when I call this method I get the error
"syntax error near or at "."" at the position of stmt.executeQuery(SQL).
I would really appreciate the help!
private void Component() {
try {
Statement stmt = con.createStatement();
String SQL = "SELECT component.*, stock.amount_of_component, component.price component.component_type "
+ "FROM component JOIN stock "
+ "ON component.id = stock.component_id "
+ "ORDER BY component.component_type";
ResultSet rs = stmt.executeQuery(SQL);
rs.next();
int id = rs.getInt("ID");
int amount_of_component = rs.getInt("Amount");
String name = rs.getString("Name");
double price = rs.getDouble("Price");
String component_type = rs.getString("Type");
System.out.println(" " + id + amount_of_component + " " + name + " " + price + " " + component_type);
} catch (SQLException err)
{
System.out.println(err.getMessage());
}
}
Typo, missing a comma in the query between component.price and component.component_type :
SELECT component.*, stock.amount_of_component, component.price, component.component_type
FROM component JOIN stock
ON component.id = stock.component_id
ORDER BY component.component_type
Edit: To read the whole result set, put this cycle instead of rs.next()
while(result.next()) {
int id = rs.getInt("ID");
int amount_of_component = rs.getInt("Amount");
String name = rs.getString("Name");
double price = rs.getDouble("Price");
String component_type = rs.getString("Type");
System.out.println(" " + id + amount_of_component + " " + name + " " + price + " " + component_type);
}
Edit2: To print the header, you have to do it manually by putting a System.out.println(" id amount_of_component name price component_type "); before the while.
You missed a comma between 'component.price' and 'component.component_type'
Ok so basically I have this code:
resultSet = statement.executeQuery("select * from FEEDBACK.COMMENTS");
writeResultSet(resultSet);
private void writeResultSet(ResultSet resultSet) throws SQLException {
System.out.println("jestem w writeresultset");
// resultSet is initialised before the first data set
while (resultSet.next()) {
// it is possible to get the columns via name
// also possible to get the columns via the column number
// which starts at 1
// e.g., resultSet.getSTring(2);
String id = resultSet.getString("id");
String user = resultSet.getString("IMIE");
String website = resultSet.getString("NAZWISKO");
String summary = resultSet.getString("ADRES");
String date = resultSet.getString("EMAIL");
String comment = resultSet.getString("TELEFON");
String opisso = resultSet.getString("OPIS");
JTextField myOutput = new JTextField(1600);
myOutput.setText("id w bazie danych to " + id + " imie to " + user
+ " nazwisko to " + website + " adres to " + summary + " email to "
+ date + " teelefon to " + comment + " opis to " + opisso);
add(myOutput);
}
}
What I want to achieve is this:
resultSet = statement.executeQuery("select * from FEEDBACK.COMMENTS
where NAZWISKO LIKE " variable );
writeResultSet(resultSet);
I want to search by variable which is already defined, however I'm stuck and have no idea how to do it like that.
Use PreparedStatement:
String nazwisko = ...
String query = "select * from FEEDBACK.COMMENTS where NAZWISKO LIKE ?";
PreparedStatement pstmt = con.prepareStatement(query);
pstmt.setString(1, nazwisko);
ResultSet rs = pstmt.execute();
while (resultSet.next()) {
//...
}
In case you need to use a wildcard for your LIKE, choose one of these:
nazwisko = nazwisko + "%";
nazwisko = "%" + nazwisko;
nazwisko = "%" + nazwisko + "%";
up , there are alot weird errors with your code:
like cannot find symbol variable con or incompatible type boolean cannot be converted to resultset.
I have tried this: but there is an error when executing
preparedStatement = connect
.prepareStatement("select * from FEEDBACK.COMMENTS where NAZWISKO= ? ; ");
preparedStatement.setString(1, surname3);
while (resultSet.next()) {
String id = resultSet.getString("i
d");
String user = resultSet.getString("IMIE");
String website = resultSet.getString("NAZWISKO");
String summary = resultSet.getString("ADRES");
String date = resultSet.getString("EMAIL");
String comment = resultSet.getString("TELEFON");
String opisso = resultSet.getString("OPIS");
JTextField myOutput = new JTextField(1600);
myOutput.setText("id w bazie danych to " + id + " imie to " + user + " nazwisko to " + website + " adres to " + summary + " email to " + date + " teelefon to " + comment + " opis to " + opisso);
add(myOutput);
}
error:
the query went fine but , the error appears here "while (resultSet.next())"
SEVERE: null
java.lang.NullPointerException
at jdbcexample.Main.readDataBase(Main.java:416)
at jdbcexample.Main$7.mousePressed(Main.java:346)
This is the code:
#Override public void update(){
Statement stmt = null;
String company = "";
try {
Connect conn = new Connect();
stmt = conn.makeStatement();
// This creates the SQL statement to update an existing student.
System.out.println("Update employee"
+ " Set employeeID = employeeID,"
+ " firstName = firstName,"
+ " lastName = lastName,"
+ " paRating = paRating,"
+ " status = status,"
+ " manager = managerr,"
+ " level = level,"
+ " company = company"
+ " WHERE employeeID = " + get EmployeeID()
+ "Limit 1");
stmt.execute("Update employee"
+ " Set employeeID = employeeID,"
+ " firstName = firstName,"
+ " lastName = lastName,"
+ " paRating = paRating,"
+ " status = status,"
+ " manager = managerr,"
+ " level = level,"
+ " company = company"
+ " WHERE employeeID = " + get EmployeeID()
+ "Limit 1");
stmt.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
System.err.println("Unable to update employee in the database.");
} finally {
}
System.out.println("Employee successfully updated to the database.");
}
I am assuming I have missed something simple & obvious that i just can't see.
This query doesn't update anything - it just sets a whole lot of columns to their existing values. If you want to update them to something else, you'd better pass those "something else" values in somehow.
Two things I note, you probably want a space between getEmployeeID() and Limit 1; Also, assuming you're not running with autoCommit enabled, you need to call Connection.commit(). Finally, you should close your connection and statement objects in the finally block.
while i am finding the data the field of TelephoneNo showing the result in float like 54435435.0.even when i inserted this phone no as 54435435 my code is
String findby =cbfind.getSelectedItem().toString();
if(findby.equals("")){
JOptionPane.showMessageDialog(null," SELECT EITHER REGISTRATION NO OR NAME");
return;
}
if(findby.equals("RegNo"))
{
int regno1= Integer.parseInt(cbregn.getSelectedItem().toString());
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
System.out.println("\n Driver loaded");
Connection con=DriverManager.getConnection("jdbc:odbc:wanisamajDB");
Statement stmt=con.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM REGISTRATION1 WHERE RegistrationNo="+regno1);
System.out.println("Hi");
rs.next();
String per = rs.getString("SeniorPerson");
System.out.println("SeniorPerson: " + per );
String reg = rs.getString("RegistrationNo");
System.out.println("RegistrationNo: " + reg);
String nplace = rs.getString("NativePlace");
System.out.println("NativePlace: " + nplace);
String kul = rs.getString("Kul");
System.out.println("Kul: " + kul);
String gtr = rs.getString("Gotra");
System.out.println("Gotra: " + gtr);
String ksami = rs.getString("KulSwami");
System.out.println("KulSwami: " + ksami);
String raddr = rs.getString("ResidensialAddress");
System.out.println("ResidensialAddress: " + raddr);
String code = rs.getString("PinCode");
System.out.println("PinCode: " + code);
String stdcd = rs.getString("STDcode");
System.out.println("STDcode: " + stdcd);
String teleno = rs.getString("TelephoneNo");
System.out.println("TelephoneNo: " + teleno);
String mno = rs.getString("MobileNo");
System.out.println("MobileNo: " + mno);
String email = rs.getString("Email");
System.out.println("Email: " + email);
String web = rs.getString("Website");
System.out.println("Website: " + web);
String educ = rs.getString("Education");
System.out.println("Education: " + educ);
String brch = rs.getString("Branch");
System.out.println("Branch: " + brch);
String bgrp = rs.getString("BloodGroup");
System.out.println("BloodGroup: " + bgrp);
JOptionPane.showMessageDialog(null, "RECORD FOUND");
cbnm.setSelectedItem(per);
tfplace.setText(nplace);
tfkul.setText(kul);
tfgotra.setText(gtr);
tfswami.setText(ksami);
taraddr.setText(raddr);
tfpcd.setText(code);
tfstdcode.setText(stdcd);
tftele.setText(teleno);
tfmno.setText(mno);
tfemail.setText(email);
tfweb.setText(web);
tfedu.setText(educ);
tfbrch.setText(brch);
cbbldgrp.setSelectedItem(bgrp);
}
catch (Exception e)
{
System.out.println("EXCEPTION " + e);
}
}
if(findby.equals("Name"))
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
System.out.println("\n Driver loaded");
Connection con=DriverManager.getConnection("jdbc:odbc:wanisamajDB");
Statement stmt=con.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM REGISTRATION1 WHERE SeniorPerson='"+cbnm.getSelectedItem().toString()+"'");
System.out.println("Hi");
rs.next();
String per = rs.getString("SeniorPerson");
System.out.println("SeniorPerson: " + per );
String reg = rs.getString("RegistrationNo");
System.out.println("RegistrationNo: " + reg);
String nplace = rs.getString("NativePlace");
System.out.println("NativePlace: " + nplace);
String kul = rs.getString("Kul");
System.out.println("Kul: " + kul);
String gtr = rs.getString("Gotra");
System.out.println("Gotra: " + gtr);
String ksami = rs.getString("KulSwami");
System.out.println("KulSwami: " + ksami);
String raddr = rs.getString("ResidensialAddress");
System.out.println("ResidensialAddress: " + raddr);
String code = rs.getString("PinCode");
System.out.println("PinCode: " + code);
String stdcd = rs.getString("STDcode");
System.out.println("STDcode: " + stdcd);
String teleno = rs.getString("TelephoneNo");
System.out.println("TelephoneNo: " + teleno);
String mno = rs.getString("MobileNo");
System.out.println("MobileNo: " + mno);
String email = rs.getString("Email");
System.out.println("Email: " + email);
String web = rs.getString("Website");
System.out.println("Website: " + web);
String educ = rs.getString("Education");
System.out.println("Education: " + educ);
String brch = rs.getString("Branch");
System.out.println("Branch: " + brch);
String bgrp = rs.getString("BloodGroup");
System.out.println("BloodGroup: " + bgrp);
JOptionPane.showMessageDialog(null, "RECORD FOUND");
cbregn.setSelectedItem(reg);
tfplace.setText(nplace);
tfkul.setText(kul);
tfgotra.setText(gtr);
tfswami.setText(ksami);
taraddr.setText(raddr);
tfpcd.setText(code);
tfstdcode.setText(stdcd);
tftele.setText(teleno);
tfmno.setText(mno);
tfemail.setText(email);
tfweb.setText(web);
tfedu.setText(educ);
tfbrch.setText(brch);
cbbldgrp.setSelectedItem(bgrp);
}
catch (Exception e)
{
System.out.println("EXCEPTION " + e);
}
}//if
I'm going to wager that it's because that's how it's stored in the DB.
Use varchar rather than whatever it is you're using.
The answer you are seeing is most likely due to:
defining the column type for the telephone number to be "float", "double", "decimal", "numeric" or "real", or
defining the column type as "char", "varchar", etc and populating it from a Java float, double or BigDecimal.
In either case, what you are seeing reflects the data stored in the database.