We Keep Coding

Java - a GUI update button

i am trying to making an update button in my GUI form that can be edit a record in my DB but i missing something that i hope someone to help me
this the code of update method:
public int updateUser(Login user) //int
{
DatabaseConnection dbconn = new DatabaseConnection();
Connection conn = dbconn.getConn();
int rows = 0;
try
{
String sql = "UPDATE LOGIN set USER_NAME = ? , PASSWORD = ? , PRIVILEGE_ID = ?";
PreparedStatement pStm = conn.prepareStatement(sql);
//fill SQL parameters from user: //
pStm.setString(1, user.getUserName());
pStm.setString(2, user.getPassword());
pStm.setInt(3, user.getPrivilegeId());
rows =
pStm.executeUpdate();
}
catch (SQLException ex) {
System.out.println("SQLException: " + ex.getMessage());
}
finally
{
try {
conn.close();
} catch (SQLException ex) {
System.out.println("SQLException: " + ex.getMessage());;
}
}
return rows;
}
code in java swing for update button:
private void updateUserLayerActionPerformed(java.awt.event.ActionEvent evt) {
// 1-get data from user and check it: //
String _name = nameLayer.getText().trim();
String _paswrd = passLayer.getText().trim();
String _prvName = privLayer.getSelectedItem().toString();
//get Privilege_Id from DB:
PrivilegeHandeler prvHndler = new PrivilegeHandeler();
int prvId = prvHndler.getPrivilegeByName(_prvName);
if(_name.length() >0 && _paswrd.length() >0 && prvId> 0)
{
Login user = new Login();
user.setUserName(_name);
user.setPassword(_paswrd);
user.setPrivilegeId(prvId);
//update User: //
loginHandeler loghndlr = new loginHandeler();
int rows =
loghndlr.updateUser(user);
if (rows >0)
{
usrFormErorr.setText("user has been added successfully :)");
nameLayer.setText("");
passLayer.setText("");
privLayer.setSelectedIndex(0);
}
else
{
usrFormErorr.setText("updated failed, try again");
}
}
else
{
usrFormErorr.setText("please, fill the required fields first");
}
}
My problem is this:
1-i am trying to enter an info to edit then update but always get an error updated failed, try again that i made it to get a message when there is a problem
Kindly help. A working code would be very highly appreciated. Thanks in advance.

SQLException: ResultSet closed

I'm trying to execute method which should create a new object with fields from database, and everytime i run this code im getting SQLException: ResultSet closed.
public DatabasedClient getDatabaseClient(int clientDatabaseid){
if(DatabaseClientUtil.isInDatabase(clientDatabaseid)){
return DatabaseClientUtil.getDBClient(clientDatabaseid);
}else{
try{
System.out.println("Trying to find user in db");
ResultSet rs = fbot.getStorage().query("select * from database_name where clientDBId = " + clientDatabaseid);
System.out.println("deb " + rs.getString("nick"));
while (rs.next()) {
DatabasedClient databasedClient = new DatabasedClient(clientDatabaseid);
databasedClient.setUid(rs.getString("uid"));
databasedClient.setNick(rs.getString("nick"));
databasedClient.setLastConnect(rs.getLong("lastConnected"));
databasedClient.setLastDisconnect(rs.getLong("lastDisconnect"));
databasedClient.setTimeSpent(rs.getLong("timeSpent"));
databasedClient.setLongestConnection(rs.getLong("longestConnection"));
return databasedClient;
}
} catch (SQLException e) {
e.printStackTrace();
}
}
return null;
}
}
Im using hikari, here are methods from AbstractStorage class
#Override
public void execute(String query) throws SQLException {
try (Connection connection = getConnection()){
connection.prepareStatement(query).executeUpdate();
}
}
#Override
public ResultSet query(String query) throws SQLException {
try (Connection connection = getConnection()) {
return connection.prepareStatement(query).executeQuery();
}
}
Screenshot from error
I hope someone will help me with this.

I think the exact error you are seeing is being caused by the following line of code:
System.out.println("deb " + rs.getString("nick"));
You are trying to access the result set before you advance the cursor to the first record. Also, your method getDatabaseClient is returning a single object which conceptually maps to a single expected record from the query. Hence, iterating once over the result set would seem to make sense. Taking all this into consideration, we can try the following:
try {
System.out.println("Trying to find user in db");
ResultSet rs = fbot.getStorage().query("select * from database_name where clientDBId = " + clientDatabaseid);
// do not access the result set here
if (rs.next()) {
DatabasedClient databasedClient = new DatabasedClient(clientDatabaseid);
databasedClient.setUid(rs.getString("uid"));
databasedClient.setNick(rs.getString("nick"));
databasedClient.setLastConnect(rs.getLong("lastConnected"));
databasedClient.setLastDisconnect(rs.getLong("lastDisconnect"));
databasedClient.setTimeSpent(rs.getLong("timeSpent"));
databasedClient.setLongestConnection(rs.getLong("longestConnection"));
return databasedClient;
}
} catch (SQLException e) {
e.printStackTrace();
}

How to auto refresh jComboBox data after update?

I have a jComboBox that getting data from MySQL server database.
When I add new data to database, the jComboBox doesn't show it, and I must reopen my program to add the new data to jComboBox.
How can I refresh jComboBox data automatically?
This is my code :
private void dataComboBox(){
try {
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/shop","root","");
Statement stat = con.createStatement();
String sql = "select id from perfume order by id asc";
ResultSet res = stat.executeQuery(sql);
while(res.next()){
Object[] ob = new Object[3];
ob[0] = res.getString(1);
jComboBox5.addItem(ob[0]);
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
private void showCBdata(){
try {
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/shop","root","");
Statement stat = con.createStatement();
String sql = "select name from perfume where id='"+jComboBox5.getSelectedItem()+"'";
ResultSet res = stat.executeQuery(sql);
while(res.next()){
Object[] ob = new Object[3];
ob[0]= res.getString(1);
jTextField8.setText((String) ob[0]);
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
//call method
private void jComboBox5ActionPerformed(java.awt.event.ActionEvent evt) {
showCBdata();
}
can you help me?
thank you..

You can do it in this way it will automatically refresh the combobox
try {
comboBox.removeAllItems();
sql = "SELECT * FROM `table_name`";
rs = stmnt.executeQuery(sql);
while (rs.next()) {
String val = rs.getString("column_name");
comboBox.addItem(val);
}
} catch (SQLException ex) {
Logger.getLogger(DefineCustomer.class.getName()).log(Level.SEVERE, null, ex);
}
removeAllItems(); method will clean the combobox to insure that not to repeat values.
You do not need to create a separate Object to add in jComboBox instead you can add String too.

Inzimam Tariq IT's Code (above):
try {
comboBox.removeAllItems();
sql = "SELECT * FROM `table_name`";
rs = stmnt.executeQuery(sql);
while (rs.next()) {
String val = rs.getString("column_name");
comboBox.addItem(val);
}
} catch (SQLException ex) {
Logger.getLogger(DefineCustomer.class.getName()).log(Level.SEVERE, null, ex);
}
I suggest putting all of this code inside an ActionListener. So that each time there the mouse is entered over the comboBox the above code will run. You should do the following:
public void mouseEntered(MouseEvent e) {
//the above code goes here
}
I suggest using a mouseListener:
https://docs.oracle.com/javase/tutorial/uiswing/events/actionlistener.html
But if you want to look at other ActionListeners you can see them here:
https://docs.oracle.com/javase/tutorial/uiswing/events/actionlistener.html

Once you add a new registry in the DB, do a removeAllItems comboBox.removeAllItems(); and repopulate de combobox,
My example:
jComboLicorerias.removeAllItems();
try {
Conector = Conecta.getConexion();
Statement St = Conector.createStatement();
try (ResultSet Rs = St.executeQuery(Query)) {
while (Rs.next()) {
jComboLicorerias.addItem(Rs.getString("nombreLicoreria"));
}
St.close();
}
} catch (SQLException sqle) {
JOptionPane.showMessageDialog(null, "Error en la consulta.");

Why does Bluemix dashDB operation throws a SqlSyntaxErrorException with SQLCODE=-1667?

I'm getting this error even though I am not trying to edit the table/column:
com.ibm.db2.jcc.am.SqlSyntaxErrorException: The operation failed because the operation is not supported with the type of the specified table. Specified table: "DASH103985.wajihs". Table type: "ORGANIZE BY COLUMN". Operation: "WITH RS".. SQLCODE=-1667, SQLSTATE=42858
#MultipartConfig
public class DemoServlet extends HttpServlet {
private static Logger logger = Logger.getLogger(DemoServlet.class.getName());
private static final long serialVersionUID = 1L;
#Resource(lookup="jdbc/db2")DataSource dataSource;
private String getDefaultText() {
TweetsCombined = new String(" ");
try {
// Connect to the Database
Connection con = null;
try {
System.out.println("Connecting to the database");
} catch (SQLException e) {
TweetsCombined = "first" +e;
}
// Try out some dynamic SQL Statements
Statement stmt = null;
try {
stmt = con.createStatement();
String tableName = "wajihs";// change table name here to one
// chosen in the first website
String columnName = "msgBody";// msgBody is where the tweets
// are stored
String query = "SELECT * FROM \"" + tableName + "\"";
ResultSet rs = stmt.executeQuery(query);
while (rs.next()) {
content = rs.getString(columnName) + ". ";
if (content.toLowerCase().contains("RT".toLowerCase())
|| content.toLowerCase().contains("Repost: ".toLowerCase())) {
// do nothing
}
else {
TweetsCombined.concat(content);
}
}
// Close everything off
// Close the Statement
stmt.close();
// close
con.commit();
// Close the connection
con.close();
} catch (Exception e) {
TweetsCombined = "second" +e;
System.out.println(e.getMessage());
}
} catch (Exception e) {
TweetsCombined = "third" + e;
System.out.println(e);
}
return TweetsCombined;
}

As I explained here, dashDB, with its BLU Acceleration features, has certain limitations compared to DB2 without BLU Acceleration. In your case it is that you can only run queries with the CS isolation level against column-organized tables.
Either change your connection configuration to use CS isolation level or create your table(s) while explicitly specifying ORGANIZE BY ROW.

Error S1000 trying to execute more MySql queries in a Java Application

I have a problem trying to execute more than one query into my Java Application code.
I have a procedure that is called in main and is in the class "Fant":
public void XXX(){
Connectivity con=new Connectivity(); // this class set up the data for the connection to db; if ( !con.connect() ) {
System.out.println("Error during connection.");
System.out.println( con.getError() );
System.exit(0);
}
ArrayList<User> blabla=new ArrayList<User>();
blabla=this.getAllUsers(con);
for (User u:blabla)
{
try {
Connectivity coni=new Connectivity();//start a new connection each time that i perform a query
Statement t;
t = coni.getDb().createStatement();
String query = "Select count(*) as rowcount from berebe.baraba";
ResultSet rs = t.executeQuery(query);
int numPrenotazioni=rs.getInt("rowcount");
rs.close(); //close resultset
t.close(); //close statement
coni.getDb().close(); //close connection
}
}
catch (SQLException e)
{
System.err.println("SQLState: " +
((SQLException)e).getSQLState());
System.err.println("Error Code: " +
((SQLException)e).getErrorCode());
}
}
}
The called function is defined as:
ArrayList<User> getAllUsers(Connectivity con) {
try{
ArrayList<User> userArrayList=new ArrayList<User>();
String query = "Select idUser,bubu,lala,sisi,gogo,gg from berebe.sasasa";
Statement t;
t = con.getDb().createStatement();
ResultSet rs = t.executeQuery(query);
while (rs.next())
{
User utente=new User(....); //user fields got from query
userArrayList.add(utente);
}
rs.close();
t.close();
con.disconnect(); //disconnect the connection
return userArrayList;
} catch (SQLException e) {
}
return null;
}
The main is:
public static void main(String[] argv) {
ArrayList<User> users=new ArrayList<User>();
System.out.println("-------- MySQL JDBC Connection Testing ------------");
Fant style = new Fant();
style.XXX();
}
The query performed into "getAllusers" is executed and into the arraylist "blabla" there are several users; the problem is that the second query that needs the count is never executed.
The MYSQlState given when running is= "S1000" and the SQLERROR is "0".
Probably i'm mistaking on connections issues but i'm not familiar with statements,connections,resultsets.
Thank you.

You might forget to call rs.next() before getting the result form it in XXX()methods as shown below:
ResultSet rs = t.executeQuery(query);
// call rs.next() first here
int numPrenotazioni=rs.getInt("rowcount");