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How can I search a customer by full name?

I'm creating a method wherein a user can search a customer either by first name, last name, or full name. the search bar only shows the result if it's by first or last name but when I try searching a customer by full name the record won't show.
Here's my code:
public int getMatchingCustomerRecords(String keyword) {
int rows = 0;
try {
if (db.startTransaction()) {
String sql = "Select COUNT(firstName OR lastName) AS TOTAL FROM Customer";
String sqlSearch = "";
if (keyword != null) {
sqlSearch = sql + " WHERE firstName LIKE '%" + keyword + "%' AND lastName LIKE '%" + keyword + "%'";
ps = db.getQueryStatement(sqlSearch);
} else {
ps = db.getQueryStatement(sql);
}
rs = ps.executeQuery();
if (rs.next()) {
rows = rs.getInt("TOTAL");
}
}
} catch (SQLException e) {
e.printStackTrace();
}
return rows;
}

Your queries should be:
Select * FROM `Customer`
WHERE `firstName` LIKE '%" + keyword + "%' OR `lastName` LIKE '%" + keyword + "%'"

public int getMatchingCustomerRecords(String keyword) {
int rows = 0;
try {
if (db.startTransaction()) {
String sql = "Select COUNT(firstName OR lastName) AS TOTAL FROM Customer";
String sqlSearch = "";
if (keyword != null) {
String[] keywordArray=keyword.split(" ");
if(keywordArray.length>1) {
// matching full Name
sqlSearch = sql+" WHERE firstName LIKE '%" + keywordArray[0].trim() + "%' AND lastName LIKE '%" + keywordArray[1].trim() + "%'";
}else {
// matching firstName or lastName
sqlSearch = sql+" WHERE firstName LIKE '%" + keywordArray[0].trim() + "%' OR lastName LIKE '%" + keywordArray[0].trim() + "%'";
}
ps = db.getQueryStatement(sqlSearch);
} else {
ps = db.getQueryStatement(sql);
}
rs = ps.executeQuery();
if (rs.next()) {
rows = rs.getInt("TOTAL");
}
}
} catch (SQLException e) {
e.printStackTrace();
}
return rows;
}

public int getMatchingCustomerRecords(String keyword) {
int rows = 0;
try {
if (db.startTransaction()) {
String sql = "Select COUNT(firstName OR lastName) AS TOTAL FROM Customer";
String sqlSearch = "";
if (keyword != null) {
sqlSearch = sql + " WHERE LOCATE(firstName ,'" + keyword + "')>=0 AND LOCATE(lastName ,'" + keyword + "')>=0";
ps = db.getQueryStatement(sqlSearch);
} else {
ps = db.getQueryStatement(sql);
}
rs = ps.executeQuery();
if (rs.next()) {
rows = rs.getInt("TOTAL");
}
}
} catch (SQLException e) {
e.printStackTrace();
}
return rows;
}

How to concatenate Resultset to String variable

I want to get my ItemName columns value to one String separate from commas.
I tried like this.but its not working
String sql = "SELECT `ItemName` FROM `invoicelist` WHERE `InvoiceId` = '"+invoicenum+"' ";
try {
ResultSet rs = CODE.DbAccess.getdata(sql);
while (rs.next()) {
String em = rs.getString("ItemName");
description = em.replace("\n", ",");
System.out.println(description);
}

You should change to this, if you want to do the concatenation in java:
String sql = "SELECT `ItemName` FROM `invoicelist` WHERE `InvoiceId` = '" + invoicenum + "' ";
try {
ResultSet rs = CODE.DbAccess.getdata(sql);
while (rs.next()) {
description += rs.getString("ItemName") + ",";
}
description = description.substring(0, description.length() - 1);
//System.out.println(description);
}
If you want to concatenate in query then you could search for GROUP_CONCAT() function

String sql = "SELECT `ItemName` FROM `invoicelist` WHERE `InvoiceId` = '" + invoicenum + "' ";
try {
ResultSet rs = CODE.DbAccess.getdata(sql);
StringBuilder builder = new StringBuilder(); // used to store string and append data further if you want
while (rs.next()) {
builder.append(rs.getString("ItemName").append(","); // adding data/Item name to builder and appending comma after adding item name
}
if(builder.length() > 0){ // if there's some data inside builder
builder.setLength(builder.length() - 1); // remove last appended comma from builder
}
System.out.println("Command Separated Data" + builder.toString()); // final data of item name
}
Other way is to concate result from SQL itself.(here's a MySQL compatible code)
String sql = "SELECT group_concat(`ItemName`) as items FROM `invoicelist` WHERE `InvoiceId` = '" + invoicenum + "' ";
try {
ResultSet rs = CODE.DbAccess.getdata(sql);
String data = "";
while (rs.next()) {
data = rs.getString("items")
}
System.out.println("Command Separated Data" + data);
}

Best way to print data from two columns of mySQL database to jTextfield one after another

I am trying to make a program in which i read an input from the user i.e. in the textfield named gname and store its value to a string called grammar. Now this input is what sorts my output from the database.
Database looks like this
So when user enters G1 in the textfield it should display records in such a way
A->ab,A-ab,B->b
But it only shows 1st element when i use if(myRs.next) and last one if i use while(myRs.next().
current output is
Here is the code for this:
its all in try catch block
String grammar = gname.getText();
myCon = DriverManager.getConnection("jdbc:mysql://localhost:3306/grammar", "root", "");
JOptionPane.showMessageDialog(rootPane, "Connected to database");
mystmt = myCon.createStatement(
ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
String query = "SELECT starting_symbol, value from starting_symbol where grammar= '" + grammar + "'";
String query2 = "SELECT non_terminals, terminals from input_values where grammar= '" + grammar + "'";
mystmt.addBatch(query);
mystmt.addBatch(query2);
myCon.setAutoCommit(false);
mystmt.addBatch(query);
mystmt.addBatch(query2);
myRs = mystmt.executeQuery(query);
while (myRs.next()) {
String s = myRs.getString("starting_symbol");
String val = myRs.getString("value");
output.setText(s + "-> " + val);
}
myRs = mystmt.executeQuery(query2);
ArrayList<String> list_one = new ArrayList<String>();
ArrayList<String> list_two = new ArrayList<String>();
while (myRs.next()) {
list_one.add(myRs.getString("non_terminals"));
list_two.add(myRs.getString("terminals"));
for (int i = 0; i < list_one.size(); i++) {
output_2.setText(list_one.get(i) + "->" + list_two.get(i));
}
}
Please help me in getting the correct outut

Use StringBuilder Luke
StringBuilder b = new StringBuilder();
while (myRs.next()) {
String s = myRs.getString("starting_symbol");
String val = myRs.getString("value");
if (b.length() > 0) {
b.append(',');
}
b.append(s + "-> " + val);
}
output.setText(b.toString());
And do the same for output_2 field

Your code snippet can be just like the following:
StringBuilder sb = new StringBuilder();
while (myRs.next()) {
if (sb.length() > 0) sb.append(",");
sb.append(myRs.getString("non_terminals"))
.append("->")
.append(myRs.getString("terminals"));
}
Instead of calling output_2.setText multiple times that only set the text to be the last fetch value of non_terminals -> terminals in this case B->b.

Before start of result set running multiple sql

I'm currently working on an application for a restaurant. The idea for the code I'm currently working on is that it gets the name from a combobox and inserts a receipt into the database whith the employee number of the person who is working on it. The code whith which I'm trying to do it is:
RestaurantOrder sqlRestaurantOrder = new RestaurantOrder();
ActionListener printReceiptListner;
printReceiptListner = (ActionEvent) -> {
int ID = Integer.parseInt(input1.getText());
try {
SystemManager manager = new SystemManager();
ResultSet rs = manager.stmt.executeQuery(sqlRestaurantOrder.setIdSql(ID));
while (rs.next()) {
double totalPrice = rs.getDouble("sumprice");
if (ID > 0) {
Receipt receiptSql = new Receipt();
String firstName = (String) cb.getSelectedItem();
String checkoutDate = new SimpleDateFormat("yyyyMMdd").format(Calendar.getInstance().getTime());
ResultSet rs2 = manager.stmt.executeQuery(receiptSql.getEmployeeId(firstName));
int employeeId = rs2.getInt("id");
while (rs2.next()) {
Receipt receiptSql2 = new Receipt();
ResultSet rs3 = manager.stmt.executeQuery(receiptSql2.SetStatusReceipt(employeeId, checkoutDate, ID, totalPrice));
while (rs3.next()) {
}
}
}
}
} catch (SQLException k) {
JOptionPane.showMessageDialog(null, k.getMessage());
}
};
The statements are:
public class Receipt {
public String sql;
public String sql2;
public String getEmployeeId(String firstName){
return sql2 = "SELECT id FROM employee WHERE firstName = '" + firstName + "';";
}
public String SetStatusReceipt(int employeeId, String checkoutDate, int id, double totalPrice){
return sql = "INSERT INTO `receipt` (`employeeId`, `price`, `restaurantOrderId`, `checkoutDate`) VALUES (" + employeeId + " , " + totalPrice + ", " + id + ", " + checkoutDate + ");";
};
}
I'm getting the error before start of result set which I looked up what it means but I can't get it fixed at the moment. Help will be appreciated.
If I forgot to post more important code let me know I'll update it

You have to call ResultSet.next() before you are able to access the fields of that ResultSet. So you need to move your assignment of employeeId into your while loop:
while (rs2.next()) {
int employeeId = rs2.getInt("id");
From the documentation of ResultSet.next():
A ResultSet cursor is initially positioned before the first row; the first call to the method next makes the first row the current row; the second call makes the second row the current row, and so on.

Search a JTable using multiple JTextfield

I have a JFrame that has 3 JTextfields and 2 JDatechooser, what I am trying to do is if only one JTextfield has something typed in it and I press the search button, then I will be able to retrieve the data to JTable, but the problem is I have to fill out all JTextFileds and JDatechooser in order to retrieve data. My idea is to ignore null JTextfields and JTdatechooser if only one JTextfield has the keyword I want ?? Any suggestions ?? Thanks in advance,
public ArrayList<BillsRecord> getBillRecordByID(int EmpCode, String Fname, String Lname, String sDate, String eDate) throws SQLException {
String sql = "SELECT B.DATE AS DT, B.EMP_ID, E.FNAME, E.LNAME, MONEY_SENT, RENT, PHONE, GAS, ELECTRICITY, INTERNET, OTHER"
+ " FROM EMPLOYEE E INNER JOIN BILLS B ON E.EMP_ID = B.EMP_ID"
+ " WHERE B.EMP_ID = ? "
+ " OR E.FNAME = ? "
+ " OR E.LNAME = ? "
+ " OR DATE BETWEEN ? AND ? "
+ " ORDER BY B.DATE";
DBConnection con = new DBConnection();
Connection connect = con.getConnection();
PreparedStatement ps = null;
ArrayList<BillsRecord> records = new ArrayList<>();
try {
ps = connect.prepareStatement(sql);
ps.setInt(1, EmpCode);
ps.setString(2, Fname);
ps.setString(3, Lname);
ps.setString(4, sDate);
ps.setString(5, eDate);
ResultSet rs = ps.executeQuery();
if (rs.next()) {
BillsRecord billrec = new BillsRecord();
billrec.setDATE(rs.getString("DT"));
billrec.setEMP_ID(rs.getInt("EMP_ID"));
billrec.setFNAME(rs.getString("FNAME"));
billrec.setLNAME(rs.getString("LNAME"));
billrec.setMONEY_SENT(rs.getDouble("MONEY_SENT"));
billrec.setRENT(rs.getDouble("RENT"));
billrec.setPHONE(rs.getDouble("PHONE"));
billrec.setGAS(rs.getDouble("GAS"));
billrec.setELECTRICITY(rs.getDouble("ELECTRICITY"));
billrec.setINTERNET(rs.getDouble("INTERNET"));
billrec.setOTHER(rs.getDouble("OTHER"));
records.add(billrec);
return records;
}
} catch (SQLException e) {
System.out.println(e.toString());
} finally {
if (ps != null) {
ps.close();
}
if (connect != null) {
connect.close();
}
}
return null;
}
private void search() {
try {
JTextField stxt = ((JTextField) startdatetxt.getDateEditor().getUiComponent());
String sDATE = stxt.getText().trim();
JTextField etxt = ((JTextField) enddatetxt.getDateEditor().getUiComponent());
String eDATE = etxt.getText().trim();
int EMP_ID = Integer.parseInt(this.empidtxt.getText().trim());
String FNAME = this.firstnametxt.getText().trim();
String LNAME = this.lastnametxt.getText().trim();
BillRecordDao billrecdao = new BillRecordDao();
ArrayList<BillsRecord> records = billrecdao.getBillRecordByID(EMP_ID, FNAME, LNAME, sDATE, eDATE);
Object[] tableColumnName = new Object[11];
tableColumnName[0] = "Date";
tableColumnName[1] = "H.License";
tableColumnName[2] = "First Name";
tableColumnName[3] = "Last Name";
tableColumnName[4] = "MONEY SENT";
tableColumnName[5] = "RENT";
tableColumnName[6] = "PHONE";
tableColumnName[7] = "GASE";
tableColumnName[8] = "ELECTRICITY";
tableColumnName[9] = "INTERNET";
tableColumnName[10] = "OTHER";
DefaultTableModel tbd = new DefaultTableModel();
tbd.setColumnIdentifiers(tableColumnName);
this.BillsSummaryTable.setModel(tbd);
Object[] RowRec = new Object[11];
for (int i = 0; i < records.size(); i++) {
RowRec[0] = records.get(i).getDATE();
RowRec[1] = records.get(i).getEMP_ID();
RowRec[2] = records.get(i).getFNAME().toUpperCase();
RowRec[3] = records.get(i).getLNAME().toUpperCase();
RowRec[4] = records.get(i).getMONEY_SENT();
RowRec[5] = records.get(i).getRENT();
RowRec[6] = records.get(i).getPHONE();
RowRec[7] = records.get(i).getGAS();
RowRec[8] = records.get(i).getELECTRICITY();
RowRec[9] = records.get(i).getINTERNET();
RowRec[10] = records.get(i).getOTHER();
tbd.addRow(RowRec);
}
} catch (SQLException e) {
System.out.println(e.toString());
}
}

Basically, you need to create a variable/dynamic query based on the available values
Now, you can do this using something like StringBuilder or even storing each query element in a List or array, but you always end up with the "trailing OR" problem (you need to know when you've got to the last element and not append the "OR" to the String or remove the trailing "OR" from the resulting String). While not difficult, it's just a pain.
However, if you're using Java 8, you can use StringJoiner!
StringJoiner sj = new StringJoiner(" OR ");
String sql = "SELECT B.DATE AS DT, B.EMP_ID, E.FNAME, E.LNAME, MONEY_SENT, RENT, PHONE, GAS, ELECTRICITY, INTERNET, OTHER"
+ " FROM EMPLOYEE E INNER JOIN BILLS B ON E.EMP_ID = B.EMP_ID"
+ " WHERE ";
List values = new ArrayList();
// EmpCode MUST be a Integer, so it can be null
if (EmpCode != null) {
sj.add("B.EMP_ID = ?");
values.add(EmpCode);
}
if (FName != null) {
sj.add("E.FNAME = ?");
values.add(FName);
}
if (LName != null) {
sj.add("E.LNAME = ?");
values.add(LName);
}
if (sDate != null && eDate != null) {
sj.add("DATE BETWEEN ? AND ?");
values.add(sDate);
values.add(eDate);
}
sql += sj.toString();
Connection connect = null;
try (PreparedStatement ps = connect.prepareStatement(sql)) {
for (int index = 0; index < values.size(); index++) {
ps.setObject(index + 1, values.get(index));
}
try (ResultSet rs = ps.executeQuery()) {
if (rs.next()) {
//...
}
}
} catch (SQLException exp) {
exp.printStackTrace();
}
You might also like to have a look at The try-with-resources Statement and have a read through Code Conventions for the Java TM Programming Language, it will make it easier for people to read your code and for you to read others