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How do I print out information with CSV spreadsheet?

I'm currently working on a project with CSV. In the task, I am supposed to type a country name in the tester method, and when I call the tester method, it will print the information of the country. For example, "Germany Chemical 32000." However, no matter what country name I put(I'm sure that country exists in the spreadsheet), it always prints out "NOT FOUND," which I don't understand how. I'm guessing the problem is in the if statement of the countryInfo method. However, I can't find the problem probably due to a lack of domain knowledge, so I hope someone can inform me or give me a hint.
public void tester(){
FileResource fr = new FileResource();
CSVParser parser = fr.getCSVParser();
String GermanyInfo = countryInfo(parser,"Peru");
System.out.println(GermanyInfo);
}
public String countryInfo(CSVParser parser, String country){
String countryInfo = " ";
for (CSVRecord record : parser){
String nation = record.get("Country");
if (nation.contains(country)){
String countryExport = record.get("Exports");
String exportValue = record.get("Value (dollars)");
countryInfo = country + ": " + countryExport + " " + exportValue;
}else{
countryInfo = "NOT FOUND";
}
}
return countryInfo;
}
Debug Process:
Hey guys, after more testing and trying, I found out the problem is really part of the if statement. My for-each loop is running through the parser, one row at a time. The way I have this written, my if statement is checking to see whether that row contains any matching country name in the Country column, but once it finds it, it just keeps going and doesn't stop because I haven't told it to do so. It would find Germany but then move on to the next rows and bypass it until the end of the file, where it will return "not found." In order for me to fix this, I need to have a return statement following the exportValues = record.get line instead of the end of my method, OR simply type in a line that says "break;" after the money line, which will end the loop and then go to the return statement at the bottom.

If you're sure that the country search in your loop works fine, just add the return statement in the right place. I would suggest to change your method like this:
public String countryInfo(CSVParser parser, String country) {
for (CSVRecord record : parser) {
String nation = record.get("Country");
if (nation.contains(country)) {
String countryExport = record.get("Exports");
String exportValue = record.get("Value (dollars)");
return country + ": " + countryExport + " " + exportValue;
}
}
return "NOT FOUND";
}
In this case - as soon as the country is found - the method will return information about it. If no country is found - the method will return String "NOT FOUND"

Problem with record existence + text field criteria

Basically, a have a sign-up interface THAT should empty fileds and certain conditions and if record exist in data basewhere first it checks if text fields are empty as written below :
private void confirmActionPerformed(java.awt.event.ActionEvent evt) {
// String f= "jdbc:derby://localhost:1527/BStest";
String name=username.getText();
String gender=null;
String passw=String.valueOf(pass.getPassword());
String repassw=String.valueOf(repass.getPassword());
String phone2=phone.getText();
String emaill=email.getText();
boolean checkage=false,checknum=false,checkcap=false,checklaw=false,checkemail=false,checkdomain=false;
boolean checklen=false,checkbfat=false,checkpass=false,checkchar=false,checkgender=false;
boolean checkempty=true;
if(name.isEmpty()){//is text field empty
checkempty=false;
JOptionPane.showMessageDialog(null,"Add a username!");}
if(passw.isEmpty()){//is text field empty
checkempty=false;
JOptionPane.showMessageDialog(null,"Add a Password!");}
if(!repassw.equals(passw)){//confirmed password is the same for password
checkempty=false;
JOptionPane.showMessageDialog(null,"Type password Again!");
}
if(phone2.isEmpty()){//is text field empty
checkempty=false;
JOptionPane.showMessageDialog(null,"Add Phone number !");
}
if(emaill.isEmpty()){//is text field empty
checkempty=false;
JOptionPane.showMessageDialog(null,"Add email please !");
}
if (!m.isSelected()&& !female.isSelected()){//no gender selected
checkempty=false;
JOptionPane.showMessageDialog(null,"Choose a gender !!");}
else if (m.isSelected()&& female.isSelected()){//both selected it shoud be only one
checkempty=false;
JOptionPane.showMessageDialog(null,"Select only One !!");}
if(age.getText().isEmpty()){//is age text field has no input
checkempty=false;
JOptionPane.showMessageDialog(null,"Enter your age !!");}
Secondly checks the criteria for each text field as indicated in the comments below
if (m.isSelected()){// is female or male selected
checkgender=true;
gender="Male";
}
else if (female.isSelected()){
checkgender=true;
gender="Female";
}
int agee =Integer.parseInt(age.getText());
char c,c2=emaill.charAt(0);
String zereofive=phone2.substring(0, 2);//start with 05
String bfat = emaill.substring(0,emaill .indexOf("#"));//digits berfore #
String domain = emaill.substring(emaill .indexOf("#") + 1);//check domain
if(Character.isLetter(c2))//is first char off email iis letter
checkchar=true;
else
JOptionPane.showMessageDialog(null,"Emails only start with letters");
if (phone2.length()==10 && zereofive.equals("05"))//check length of phone number
checklen=true;
else
JOptionPane.showMessageDialog(null,"enter 10 digits for the phone number and starts with 05");
if(bfat.length()>=6 || bfat.length()<=15){//check digits before #
checkemail=true;
}
if(domain.equals("gmail.com") || domain.equals("hotmail.com")){//check domain of email
checkdomain=true;
}
else
JOptionPane.showMessageDialog(null,"Email domain is wrong");
if(agee>=18)//only can register in 18 or above
checkage=true;
else
JOptionPane.showMessageDialog(null,"You can't register because you are under 18. ");
if(passw.length()>7){// password at least 8 digit at least one captial and one small letter
checklen=true;
for (int i=0;i<passw.length();i++){
c=passw.charAt(i);
if(Character.isDigit(c))
checknum=true;
else if (Character.isUpperCase(c))
checkcap=true;
else if (Character.isLowerCase(c))
checklaw=true;
if(checknum && checkcap && checklaw )
checkpass=true;
}}
if(checkpass)//check of all 3 crietria of pass word is coorrect
checkpass=true;
else
JOptionPane.showMessageDialog(null,"password must be at least 8 digits \n at least 1 Upper Case letter \n at least 1 Lower Case letter \n at least 1 number \n");
and lastly stores in the database if criteria is meet and record is not exists
PreparedStatement reg,exist;
String query="INSERT INTO customer (Cu_name, Cu_password, Cu_age, Cu_gender, Cu_email, Cu_phone) VALUES (?, ?, ?, ?, ?, ?)";//enter user info in database
String record_exists="SELECT * FROM customer where Cu_name=? and Cu_password= ? and Cu_age=? and Cu_gender=? and Cu_email=? and Cu_phone=?";
try{
String f= "jdbc:derby://localhost:1527/BStest";
Connection connection = DriverManager.getConnection(
f, "meme", "Moudhi102");
reg=connection.prepareStatement(query);
exist=connection.prepareStatement(record_exists);
reg.setString(1, name);
reg.setString(2, passw);
reg.setInt(3, agee);
reg.setString(4, gender);
reg.setString(5, emaill);
reg.setString(6, phone2);
exist.setString(1, name);
exist.setString(2, passw);
exist.setInt(3, agee);
exist.setString(4, gender);
exist.setString(5, emaill);
exist.setString(6, phone2);
rs=exist.executeQuery();
if(rs==null){
if(checkpass &&checkage && !checkdomain && !checkemail && !checklen && checkchar && !checkgender && checkempty ){//if all criteria justified then add it to database
reg.executeUpdate();
JOptionPane.showMessageDialog(null,"Complete! new user added !! ");
}
}else//else it can't be added
{
JOptionPane.showMessageDialog(null, "Record already exists");
}
}
catch(SQLException ex){
JOptionPane.showMessageDialog(null,ex);
}
the problem is it doesn't show a message if record already exists in database and if I entered empty text in age + phone + email it shows the message that it is empty but in the NetBeans itself shows an error message in the output area like below
at
java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:592)
at java.lang.Integer.parseInt(Integer.java:615)
at event_system.Sign_up.confirmActionPerformed(Sign_up.java:275)
at event_system.Sign_up.access$000(Sign_up.java:20)
at event_system.Sign_up$1.actionPerformed(Sign_up.java:70)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
and doesn't do the coding part of these three fields and show their messages even for password if criteria is not meet and other field inputs are ok is shows a continuous message of record exists and Can't register check/fill you information.Please help me i'm stuck and can't figure it out

Deal with your exception first before even considereing to deal with your other problems since it will prevent the other portions of your code to be run from the point of exception and therefore be the root cause to all your problems at this time.
You can not pass a Null String ("") to the Integer#parseInt() method:
int agee = Integer.parseInt(age.getText());
If the Text Field that is to contain an age is empty then the JTextField#getText() method will return a Null String (""). If you supply this to the Integer#parseInt() method (as you've done in the above code) or anything other than an integer value then a NumberFormatException is generated. You need to take care of this possible condition and the use of a Ternary Operator (aka Conditional Operator) may be all you need:
int agee = age.getText().trim().equals("") ? 0 : Integer.parseInt(age.getText().trim());
This however doesn't cover the fact that a alpha character might accidently be supplied within the Age text field. To cover that problem it may be just better to do:
String theAge = age.trim().getText();
int agee = 0;
// Regular Expression used to ensure a Integer
// Numerical String value was supplied.
if (theAge.matches("\\d+")) {
agee = Integer.parseInt(theAge);
}
In the above line of code, IF the Age text-field contains nothing or blank spaces then the agee variable is supplied a integer 0 value ELSE the Integer.parseInt() method is used with the contents of the Text Field to fill the agee variable.
On a side note:
You utilize a lot of boolean flags for each of your text fields so as to ensure validity and other things. From what I can see you actually don't need any of them since you are checking all fields and your requirements are that all those fields actually be filled:
boolean checkage=false, checknum=false, checkcap=false, checklaw=false,
checkemail=false,checkdomain=false;
boolean checklen=false, checkbfat=false, checkpass=false, checkchar=false,
checkgender=false;
boolean checkempty=true;
I would get rid of all of them and and not use a flag at all. If at any time within your code any one of your Text Fields does not meet validity within the confirmActionPerformed() event then nothing should be read from or written to the database. As the fields are checked for validity and any of those fields fail you simply need to display the fact via Message Box then when the User selects the OK button we set focus on the Text Field currently being checked (age.requestFocus();) then exit the event with a return; statement. Database code can never be reached unless all your text fields passes validity. Your event code might look like this:
private void confirmActionPerformed(java.awt.event.ActionEvent evt) {
// String f= "jdbc:derby://localhost:1527/BStest";
String name = username.getText().trim();
String gender = null;
String passw = String.valueOf(pass.getPassword());
String repassw = String.valueOf(repass.getPassword());
String phone2 = phone.getText().trim();
String emaill = email.getText().trim();
// NAME
//is Name text field empty
if (name.isEmpty()) {
JOptionPane.showMessageDialog(null, "Add a username!");
username.requestFocus();
return;
}
// PASSWORD
//is Password field empty
if (passw.isEmpty()) {
JOptionPane.showMessageDialog(null, "Add a Password!");
pass.requestFocus();
return;
}
/* A Regular Expression is used here to ensure your desired
password rules apply - Minimum of 8 characters in length,
at least 1 Uppercase Letter, at least 1 Lowercase letter,
at least 1 digit. */
if (!passw.matches("^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)[a-zA-Z\\d]{8,}$")) {
JOptionPane.showMessageDialog(null, "Password must be:\n\n"
+ "- At least 8 characters in length,\n"
+ "- Contain at least 1 Uppercase letter,\n"
+ "- Contain at least 1 Lowercase letter,\n"
+ "- Contain at least 1 number.");
pass.requestFocus();
return;
}
// confirmed password is the same for password
if (!repassw.equals(passw)) {
JOptionPane.showMessageDialog(null, "Type password Again!");
repass.requestFocus();
return;
}
// PHONE
//is phone text field empty
if (phone2.isEmpty()) {//is text field empty
JOptionPane.showMessageDialog(null, "Add Phone number !");
phone.requestFocus();
return;
}
// starts with 05
String zereofive = phone2.substring(0, 2);
// check length of phone number
if (phone2.length() != 10 && !zereofive.equals("05")) {
JOptionPane.showMessageDialog(null, "enter 10 digits for the phone number and starts with 05");
phone.requestFocus();
return;
}
// E-MAIL
//is E-Mail text field empty
if (emaill.isEmpty()) {
JOptionPane.showMessageDialog(null, "Add email please !");
email.requestFocus();
return;
}
// E-Mail
char c, c2 = emaill.charAt(0);
String bfat = emaill.substring(0, emaill.indexOf("#"));//digits berfore #
String domain = emaill.substring(emaill.indexOf("#") + 1);//check domain
// is first char off email a letter
if (!Character.isLetter(c2)) {
JOptionPane.showMessageDialog(null, "Emails can only start with letters!");
email.requestFocus();
return;
}
//check digits before #
if (bfat.length() < 6 || bfat.length() > 15) {
JOptionPane.showMessageDialog(null, "Invalid digits in Email address!");
email.requestFocus();
return;
}
//check domain of email
if (!domain.equals("gmail.com") && !domain.equals("hotmail.com")) {
JOptionPane.showMessageDialog(null, "Email domain is wrong!");
email.requestFocus();
return;
}
// GENDER
//no gender selected
if (!m.isSelected() && !female.isSelected()) {
JOptionPane.showMessageDialog(null, "Choose a Gender!!");
return;
}
//both Genders are selected where it shoud be only one
else if (m.isSelected() && female.isSelected()) {
JOptionPane.showMessageDialog(null, "Select only One Gender!!");
return;
}
// is female or male selected
if (m.isSelected()) {
gender = "Male";
}
else if (female.isSelected()) {
gender = "Female";
}
// AGE
//is Age text field empty
String theAge = age.trim().getText();
if (theAge.isEmpty()) {
JOptionPane.showMessageDialog(null, "Enter your age !!");
age.requestFocus();
return;
}
int agee = 0; // Default
// Regular Expression used to ensure a Integer
// Numerical String value was supplied.
if (theAge.matches("\\d+")) {
agee = Integer.parseInt(theAge);
}
// only 18 + can register
if (agee < 18) {
JOptionPane.showMessageDialog(null, "You can't register because you are under 18!");
age.requestFocus();
return;
}
// DATABASE
Connection connection = null;
PreparedStatement reg, exist;
ResultSet rs = null;
String query = "INSERT INTO customer (Cu_name, Cu_password, Cu_age, Cu_gender, Cu_email, Cu_phone) VALUES (?, ?, ?, ?, ?, ?)";//enter user info in database
String record_exists = "SELECT * FROM customer where Cu_name=? and Cu_password= ? and Cu_age=? and Cu_gender=? and Cu_email=? and Cu_phone=?";
try {
String f = "jdbc:derby://localhost:1527/BStest";
connection = DriverManager.getConnection(f, "meme", "Moudhi102");
reg = connection.prepareStatement(query);
exist = connection.prepareStatement(record_exists);
reg.setString(1, name);
reg.setString(2, passw);
reg.setInt(3, agee);
reg.setString(4, gender);
reg.setString(5, emaill);
reg.setString(6, phone2);
exist.setString(1, name);
exist.setString(2, passw);
exist.setInt(3, agee);
exist.setString(4, gender);
exist.setString(5, emaill);
exist.setString(6, phone2);
rs = exist.executeQuery();
if (rs == null) {
reg.executeUpdate();
JOptionPane.showMessageDialog(null, "Complete! new user added !! ");
}
// User Already Exists In Database
else {
JOptionPane.showMessageDialog(null, "User already exists");
}
}
catch (SQLException ex) {
JOptionPane.showMessageDialog(null, ex);
}
finally {
if (reg != null) {
reg.close();
}
if (rs != null) {
rs.close();
}
if (connection != null) {
connection.close();
}
}
}
Age may not necessarily be a good piece of criteria to use in your query WHERE clause when checking database records for a duplicate record of a particular User. It only enforces the fact that each record is only valid for a single year. Things change and Age, E-Mails, Phone Numbers, etc are some of those things that can change often. There is obviously nothing wrong with the concept if only the Name and Password are used for access validity (which should suffice for most cases) and the remaining criteria is merely used for indicating that updating is required to the User data account.
You should consider Supplied Passwords to be hashed and it is the hash that is stored in database. When a User supplies a password then that password is hashed and compared to a hash already stored in database. No one, including yourself should ever know what the password truly is. Only the User should ever know what the password might be. jBCrypt works pretty good for this. To hash a password using this library:
Imports:
import org.mindrot.jbcrypt.BCrypt;
import static org.mindrot.jbcrypt.BCrypt.hashpw;
A Class Member Varaible:
// Define the BCrypt WORKLOAD to use when generating
// password hashes. 10-31 is a valid value.
private static final int WORKLOAD = 12;
To Hash a plaintext password so as to store in database:
/**
* This method can be used to generate a string representing an account
* password suitable for storing in a database. It will be an OpenBSD-style
* crypt(3) formatted hash string of length=60 The BCrypt WORKLOAD is
* specified in the above static variable, a value from 10 to 31. A WORKLOAD
* of 12 is a very reasonably safe default. This automatically handles
* secure 128-bit salt generation and storage within the hash.
*
* #param password_plaintext The account's plaintext password as provided
* during account creation, or when changing an
* account's password.
*
* #return String - a string of length 60 that is the bcrypt hashed password
* in crypt(3) format.
*/
public static String hashPassword(String password_plaintext) {
String salt = BCrypt.gensalt(WORKLOAD);
String hashedPassword = hashpw(password_plaintext, salt);
return hashedPassword;
}
To check a plaintext password with a stored hash from database:
/**
* This method can be used to verify a computed hash from a plaintext (e.g.
* during a login request) with that of a stored hash from a database. The
* password hash from the database must be passed as the second argument.
*
* #param passwordAsPlainText The accounts plaintext password, as provided
* during a login request
*
* #param storedEncryption The accounts stored password hash, retrieved
* from the authorization database
*
* #return boolean - true if the password matches the password of the stored
* hash, false otherwise
*/
/*
public static boolean checkPassword(String passwordAsPlainText, String storedEncryption) {
boolean passwordVerification;
if (null == storedEncryption || !storedEncryption.startsWith("$2a$")) {
throw new java.lang.IllegalArgumentException(
"Invalid encryption provided for comparison");
}
passwordVerification = checkpw(passwordAsPlainText, storedEncryption);
return passwordVerification;
}

How to search a CSV file based on an input field?

I am able to access only few number of lines (41 lines to be proper).after that I am unable to read.
import java.io.File;
import java.util.Scanner;
public class FileReader {
public static void main(String[] args) {
String filePath = "qwe.csv";
System.out.println("Enter the City name to be Searched\n");
Scanner in = new Scanner(System.in);
String searchTerm = in.nextLine();
readRecord(filePath, searchTerm);
}
public static void readRecord( String filePath, String searchTerm ) {
boolean found = false;
String City = ""; String City_Asciis = ""; String Lattitude = "";
String longitude = ""; String Country = "";
String iso_2 = ""; String iso_3 = ""; String Admin_Name = "";
String Capital = ""; String Population = ""; String Id = "";
try {
File file = new File(filePath);
Scanner x = new Scanner (file);
x.useDelimiter("[,\n]"); //to separate the data items
//hasNext - Returns true if the scanner has another token/value in its input
while(x.hasNext() && !found) {
City = x.next();
City_Asciis = x.next();
Lattitude = x.next();
longitude = x.next();
Country = x.next();
iso_2 = x.next();
iso_3 = x.next();
Admin_Name = x.next();
Capital = x.next();
Population = x.next();
Id = x.next();
if (City.equals(searchTerm)) {
found = true;
}
}
if (found) {
System.out.println(" The following details are of city : " + City +"\n The Ascii string would be : "
+ City_Asciis +"\n Its having the lattitude around : "
+ Lattitude + "\n and Longitude of : "+ longitude +"\n It is situated in : "
+ Country +"\n These have iso code like : "+ iso_2 +" and : "+ iso_3 +"\n It comes under : "
+ Admin_Name +" State \n Capital of this city is : "+ Capital +"\n The population is around : "
+ Population +"\n ZIP code is : "+Id+"");
}
else {
System.out.print("Enter the Correct City Name");
}
}
catch(Exception e1){
System.out.print("file not found \n");
e1.printStackTrace();
}
}
}
This code will load the searched city from the file path given, so that given a particular city name print the details of the city.

Who knows?
Without getting a headache, the code itself looks as though it should work and I personally can't off hand see why your read will only do 41 lines without doing a series of experiments with actual data and not many people really want to do that which is why you've been asked to provide some sample fictitious data.
It could be as simple as the fact that you are satisfying the boolean found variable criteria within the while loop condition and the loop breaks out stopping the read. I would suspect this since you do indicate that the "code will load the searched city from the file path given". I should think that this is not really what you would want for the mere reason that some countries contain the same City names. As a matter of fact, some States, Provinces, or Regions within the same Country can contain same City names. As an example did you know that in the United States alone, there are 88 Cities and Towns named Washington? I know, weird right, especially when you consider that there are only 50 States and 2 Territories. Benjamin Franklin was also one of the Founding Fathers of the United States and there are 35 cities and towns/villages that honorably carry the name of Franklin within that country.
If your data file or database is big enough then I'm sure you would want to display all cities that match your specific search criteria. With that being said perhaps what you need to do is get rid of that && !found condition for the while loop. I personally wouldn't use the Scanner#hasNext() method in the while loop condition either. It's an invitation for disaster since it's more focused towards checking the availability of tokens when used in combination with Scanner#next() rather than actual file lines. Use the Scanner#hasNextLine() in combination with the Scanner#nextLine() method then use the String#split() method to parse the CSV comma (,) delimited data lines one line at a time.
Below I provide a runnable Java code example which demonstrates the above mentioned methods. Your readRecord() method is used but considerably modified to accommodate the following options:
Return a List Interface (List<String>) of City information found
pertaining to the supplied search criteria.
Ignore (skip past) blank or comment lines within the CSV file. Comment lines can start with # or ;.
The option to ignore letter case during the search.
Allow for selection of the desired City Information field to which
the Search Criteria will be applied to. The City Information Fields
are:
City, CityAscii, Latitude, Longitude, Country, ISO2,
ISO3, AdminName, Capital, Population, and ID
Wildcard (? and *) characters can be used when supplying the desired search field so that the entire field name does not need to be provided, for example: lat* for Latitude. So, you can do a City Information search simply based on population if you like instead of a City Name.
Allow for wildcard (? and *) characters to be used within the
supplied search criteria for example: wash*. This tells the method
to search for any city which name starts with Wash like
Washington or Washougal or Washtucna.
Allow for the number of found city instances to be returned.
Below is the runnable code which demonstrates the above mentioned concepts. The code is well commented. There are Regular Expressions used within the code and if you want an explanation of those expressions then copy/paste them into regex101.com.
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class CityInfoRecords {
public static void main(String[] args) {
/* The appplication is started this way so that there
is no need for static methods or variables.
*/
new CityInfoRecords().startApp(args);
}
// Application Start method.
private void startApp(String[] args) {
String ls = System.lineSeparator(); // Not all OS Consoles work well with "\n"
String filePath = "qwe.csv"; // Path and file name of the data file.
Scanner in = new Scanner(System.in);
// Provide the City Info Field to base search from...
System.out.println("Enter the Data Field you want to search by:" + ls
+ "[City, CityAscii, Lattitude, Longitude, Country" + ls
+ "ISO2, ISO3, AdminName, Capital, Population, ID]" + ls
+ "Wildcards (? and *) can be used:");
String searchField = in.nextLine();
// Provide the Search Criteria to find within the supplied City Info Field.
System.out.println(ls + "Enter the search criteria you are looking for" + ls
+ "in " + searchField + ". Wildcards (? and *) are permitted:");
String searchCriteria = in.nextLine();
// Declare a List Interface of String and fill it
// with the call to the readRecord method.
List<String> cityInfoList = readRecord(filePath, searchField, searchCriteria, 0, "N/A");
// Display the returned List to console window.
for (int i = 0; i < cityInfoList.size(); i++) {
System.out.println(cityInfoList.get(i));
}
}
/**
* Returns a List Interface of the City Information found based on the supplied
* search criteria.<br><br>
*
* #param filePath (String) The full path and file name of the data file to read
* containing City information.<br>
*
* #param searchField (String) The City Information Field to based the supplied
* Search Criteria from. Any City Information Field can be supplied here and
* letter case is optional. The wildcard characters (? and *) can also be used
* here so that the entire field name does not need to be supplied, for example:
* <pre>
* lat* for the Latitude field or
* *asc* for the CityAscii field or
* iso? for either the ISO2 or ISO3 fields or simply
* City for the City field.</pre><br>
*
* The <b>?</b> wildcard character specifies any single alphanumeric character,
* as in ?an, which locates "ran," "pan", "can", and "ban".<br><br>
*
* The <b>*</b> wildcard character specifies zero or more of any alphanumeric
* character, as in corp*, which locates "corp", "corporate", "corporation",
* "corporal", and "corpulent".<br>
*
* #param searchCriteria (String) The search criteria string. This can be any
* string you would like to search for within the supplied City Information
* Field. By default letter case is ignored during searches therefore the
* supplied search criteria string does not need to be letter case specific
* however if you want the search to be case specific then set this methods
* optional ignoreLetterCase parameter to false.<br><br>
*
* Wildcard characters (? and *) can also be used within the Search Criteria
* string so as to expand the search to other possibilities, for example if
* the "City" field is supplied and a criteria string like: "wash*" is supplied
* then any city which name starts with "Wash" will have their city information
* returned.<br><br>
*
* The <b>?</b> wildcard character specifies any single alphanumeric character,
* as in ?an, which locates "ran," "pan", "can", and "ban".<br><br>
*
* The <b>*</b> wildcard character specifies zero or more of any alphanumeric
* character, as in corp*, which locates "corp", "corporate", "corporation",
* "corporal", and "corpulent".<br>
*
* #param numberOfFoundToReturn (int) The number of cities who's information
* should be returned. If 0 is supplied then all cities found will be returned.<br>
*
* #param noDataReplacement (String) Sometimes there is no data supplied for a
* specific field within the data file or the file data line may not contain
* the same amount of delimited data. Rather than returning NULL or Null String
* ("") for empty data fields you can supply here what to actually return in
* such a case. "N/A" is a good choice or perhaps: "Nothing Supplied". Whatever
* you like to use can be supplied here.<br>
*
* #param ignoreLetterCase (Optional - Boolean - Default is true) By default
* searches ignore letter case but if you want your search to be letter case
* specific then you can supply boolean false to this optional parameter.<br>
*
* #return (String List Collection) Information for every City found within the
* supplied data file which matches the supplied field and search criteria.
*/
public List<String> readRecord(String filePath, String searchField,
String searchCriteria, int numberOfFoundToReturn,
String noDataReplacement, boolean... ignoreLetterCase) {
String ls = System.lineSeparator(); // Not all OS Consoles work well with "\n" (property)
boolean ignoreCase = true; // Ignore letter case when searching (Default - property)
if (ignoreLetterCase.length > 0) {
ignoreCase = ignoreLetterCase[0];
}
boolean found = false; // Flag to indicate data was found (toggles)
int foundCounter = 0; // Indicates number of same data found (increments)
List<String> returnableList = // The List of found city information that will be returned (collection)
new ArrayList<>();
// City Information Variables (data fields)
String city;
String cityAscii;
String latitude;
String longitude;
String country;
String iso2;
String iso3;
String adminName;
String capital;
String population;
String id;
// Open Scanner to read data file...
// Try With Resources is used here to auto close the reader.
try (Scanner fileReader = new Scanner(new File(filePath))) {
// Iterate through data file...
while (fileReader.hasNextLine()) {
// Read file line by line and remove leading or
// trailing whitespaces, tabs, line breaks, etc.
String cityData = fileReader.nextLine().trim();
// Skip blank or comment lines (comment lines can be lines that start with # or ;)
if (cityData.equals("") || cityData.startsWith("#") || cityData.startsWith(";")) {
continue; // Get next file line
}
// Split the read line based on any comma delimited anomaly.
String[] cityInfo = cityData.split(",|,\\s+|\\s+,|\\s+,\\s+");
// The number of data pieces split from data line.
// Not all lines may contain the same amount of data.
int i = cityInfo.length;
/* Ternary is used to fill city information variables
so that data not provided will not be null or null string.
As an Example for the city variabel this is the same as:
if (i >= 1 && !cityInfo[0].equals("")) {
city = cityInfo[0].trim();
}
else {
city = noDataReplacement;
}
*/
city = (i >= 1 && !cityInfo[0].equals("")) ? cityInfo[0].trim() : noDataReplacement;
cityAscii = (i >= 2 && !cityInfo[1].equals("")) ? cityInfo[1].trim() : noDataReplacement;
latitude = (i >= 3 && !cityInfo[2].equals("")) ? cityInfo[2].trim() : noDataReplacement;
longitude = (i >= 4 && !cityInfo[3].equals("")) ? cityInfo[3].trim() : noDataReplacement;
country = (i >= 5 && !cityInfo[4].equals("")) ? cityInfo[4].trim() : noDataReplacement;
iso2 = (i >= 6 && !cityInfo[5].equals("")) ? cityInfo[5].trim() : noDataReplacement;
iso3 = (i >= 7 && !cityInfo[6].equals("")) ? cityInfo[6].trim() : noDataReplacement;
adminName = (i >= 8 && !cityInfo[7].equals("")) ? cityInfo[7].trim() : noDataReplacement;
capital = (i >= 9 && !cityInfo[8].equals("")) ? cityInfo[8].trim() : noDataReplacement;
population = (i >= 10 && !cityInfo[9].equals("")) ? cityInfo[9].trim() : noDataReplacement;
id = (i >= 11 && !cityInfo[10].equals("")) ? cityInfo[10].trim() : noDataReplacement;
// Determine the city data field we want to search in
String regex;
// Were wildcards used in the supplied Search Field string?
if (searchField.contains("?") || searchField.contains("*")) {
// Yes... Prep regex to get proper search field
regex = searchField.replace("?", ".?").replace("*", ".*?").toLowerCase();
}
else {
regex = "(?i)(" + searchField + ")";
}
// Get proper search field data
String field = "";
if ("city".toLowerCase().matches(regex)) {
field = city;
}
else if ("cityAsciis".toLowerCase().matches(regex)) {
field = cityAscii;
}
else if ("lattitude".toLowerCase().matches(regex)) {
field = latitude;
}
else if ("longitude".toLowerCase().matches(regex)) {
field = longitude;
}
else if ("country".toLowerCase().matches(regex)) {
field = country;
}
else if ("iso2".toLowerCase().matches(regex)) {
field = iso2;
}
else if ("iso3".toLowerCase().matches(regex)) {
field = iso3;
}
else if ("adminName".toLowerCase().matches(regex)) {
field = adminName;
}
else if ("capital".toLowerCase().matches(regex)) {
field = capital;
}
else if ("population".toLowerCase().matches(regex)) {
field = population;
}
else if ("id".toLowerCase().matches(regex)) {
field = id;
}
if (field.equals("")) {
System.err.println("Invalid Search Field Name Provided! (" + searchField + ")");
return returnableList;
}
// See if the search criteria contains wildcard characters
// A search can be carried out using wildcards in this method.
if (searchCriteria.contains("?") || searchCriteria.contains("*")) {
// There is...build the required Regular Expression (RegEx) to use.
regex = searchCriteria.replace("?", ".?").replace("*", ".*?");
// See if the data item matches the search criteria ignoring letter case if desired.
// The String.matches() method is used for this and ternary for ignoring letter case.
if (ignoreCase ? field.toLowerCase().matches(regex.toLowerCase()) : field.matches(regex)) {
found = true; // toogle flag to true if there is a match.
}
}
// No wildcard characters in search criteria...
// Ternary is used in condition to handle ignore letter case if desired.
else if (ignoreCase ? field.equalsIgnoreCase(searchCriteria) : field.equals(searchCriteria)) {
found = true; // toogle flag to true if there is a match.
}
// If the 'found' flag has been set to true...
if (found) {
// Add City information to returnable ArrayList
String info = ls + "The following details are of city: " + city + ls
+ "The Ascii string would be: " + cityAscii + ls
+ "It has the approximate Lattitude of: " + latitude + ls
+ "And the approximate Longitude of: " + longitude + ls
+ "It is situated in the country of: " + country + ls
+ "The city has iso codes like: " + iso2 + " and: " + iso3 + ls
+ "The State/Province/Region is: " + adminName + ls
+ "Capital of this city is: " + capital + ls
+ // Didn't know cities had capitals
"The population is approximately: " + population + ls
+ "City general ZIP code is: " + id;
returnableList.add(info); // Add to list
found = false; // Toggle found flag back to false in prep to locate more city data.
foundCounter++; // increment the found counter.
// If the First Instance Only flag is true then...
if (numberOfFoundToReturn > 0 && foundCounter == numberOfFoundToReturn) {
// Break out of the 'while' loop. We don't need anymore cities.
break;
}
}
}
// If the Found Counter was not incremented then
// we didn't find any data in file... Inform User.
if (foundCounter == 0) {
System.err.print(ls + "Can not find City Name (" + searchCriteria
+ ") in data file!" + ls);
}
}
catch (FileNotFoundException ex) {
System.err.print("City Data file not found! (" + filePath + ")" + ls);
}
// Return the List of found data.
return returnableList;
}
}
Create a new Java Application Project and name it CityInfoRecords. Copy and paste the above code over top of the Main Startup class. Run the application, read the console prompts carefully and enter the proper data.
The first prompt asks for a City Information Field name...enter: city.
The second prompt will ask for the search criteria for city...enter a city name in Upper or lower case (it doesn't matter). The city information will be displayed in console but only if that city name is contained within the City field within the data file.
Now run the code again and enter the same data except this time, for the city name just provide the first three letters of a city name and an asterisk (*) and then hit the enter key. Now any city information within your specific City Data File which starts with those supplied three letters will be displayed within the Console Window.
Play with it, try different fields to search from and play with the wildcard characters as well with your supplied field or search criteria data.
Now make readRecord a Class instead of a method which would be better.

Auto Increment ID break the Sequence

My program has an auto incremented ID with the format of ITM001, ITM002.... But after ITM009, ITM0010 the sequence is broken and goes back to ITM001. Because of that I'm getting ITM0010 as next item ID instead of ITM0011. Please help me to understand how should I write the query to continue the sequence.
ITM001
**ITM0010**
ITM002
ITM003
ITM004
ITM005
ITM006
ITM007
ITM008
ITM009
Connection conn = DBConnection.conn();
String sql = "select itemId from ItemMain";
ResultSet res = DBHandller.getData(sql, conn);
if (res.last()) {
String lastid = res.getString("itemId");
return lastid;
}
return null;
/////////////////////////////////////////////////////////////////////////////
String itemID = ItemController.getItemID();
String[] split = itemID.split("ITM",0);
int num = Integer.parseInt(split[1]);
itemID = "ITM00"+ (num+1);
txtitemID.setText(itemID);

The problem is that you're using split on 0, and there are several 0's in your String after you increment, for instance:
String[] split = itemID.split("ITM",0);
int num = Integer.parseInt(split[1]);
String second = "ITM00" + (num + 1);
System.out.println(second);
System.out.println(Arrays.toString(second.split("0")));
This will output:
[ITM, , 1]
Since the last 0 will also be split.
Something like:
String itemID = "ITM009";
int num = Integer.parseInt(itemID.substring(itemID.indexOf("0")));
String second = "ITM0" + String.format("%02d", num + 1);
System.out.println(second);
Will give you what you want probably, but you need to figure out how many digits you want your key to have and adapt accordingly.

You are implicitly sorting on a VARCHAR field.
SELECT a.a FROM (
SELECT 'a001' [a]
UNION ALL
SELECT 'a009' [a]
UNION ALL
SELECT 'a0010' [a]
) a ORDER BY a
a001
a0010
a009
The last id you pick up will always be 009 so the next one you create will always be 0010.
If you front padded the "10" with 1 "0" instead of two the implicit ascending sorting would be correct. "001 ... 009, 010"

After extracting data from html using a for loop, how do I insert one by one into a database?

I have extracted multiple data from an HTML using Jsoup and now I am trying to insert one by one into a derby db using JDBC on netbeans.
Here is my code:
public String nameOf() {
String nameStr = null;
String nameResults = "";
for(int j=100;j<=110;j++) {
refNum = j;
//System.out.println("Reference Number: " + refNum);
try {
//crawl and parse HTML from definition and causes page
Document docDandC = Jsoup.connect("http://www.abcd.edu/encylopedia/article/000" + refNum + ".htm").get();
// scrape name data
Elements name = docDandC.select("title");
nameStr = name.get(0).text();
//System.out.println(nameStr);
nameResults += nameStr + " ";
} catch (Exception e) {
//System.out.println("Reference number " + refNum + " does not exist.");
}
}
return nameResults;
So this method takes the names of diseases from 10 different HTMLs. What I am trying to do is to insert one name at a time to a derby db that I have created using JDBC. I have everything set up and all I have left to do is to insert each name in the corresponding name field of a table named DISEASE (which has fields: id, name, etc).
nameResults += nameStr + " ";
This part worries me as well since some diseases can have multiple words. Maybe I should use a list of some sort?
Please help! Thanks in advance.

Something like:
public List<String> nameOf() {
...
List<String> nameResults = new ArrayList<String>();
...
nameResults.add(nameStr);
...
return nameResults;