Hi, Here is my code:
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;
public class civil_fst extends JFrame implements ItemListener, ActionListener{
static Connection con;
static Statement stmt;
static ResultSet rs;
static ResultSetMetaData rsMeta;
String query;
String ref="",rollno="";
String[] heads;
int[] stChange;
String[][] cubeData;
int rows, cols, coo;
/** Creates new form civil_fst */
public civil_fst() {
initComponents();
con = null;
stmt = null;
rs = null;
rsMeta=null;
query="SELECT * FROM civilfattnd order by Regd_No";
rows=0;
cols=0;
coo=0;
try
{
Class.forName("com.mysql.jdbc.Driver");
con=DriverManager.getConnection("jdbc:mysql://localhost:3306/student","root","root");
con.setAutoCommit(true);
stmt=con.createStatement();
rs=stmt.executeQuery(query); //execute the query and get resultset(rs)
rsMeta=rs.getMetaData(); //get rs metadata
cols=rsMeta.getColumnCount(); // get number of columns
coo=cols-1;
while(rs.next()) { // get rows in resultset
++rows;
}
heads = new String[cols]; // initialize col heads
for (int i = 0; i < cols; i++) { // getting colums heading in heads[]
int colindex=i+1; // column indexes start from 1
heads[i] = rsMeta.getColumnName(colindex);
}
stChange = new int[rows]; //to save value when status changed
rs=stmt.executeQuery(query); // execure query and get resultset (rs)
cubeData = new String[rows][cols]; // initialize table data
int j=0; int k=0; // function to get resultset data
while(rs.next())
{
if(j<=rows)
{
int h=1;
if(k<=cols)
{
for(int cc=0;cc<cols; cc++)
{
cubeData[j][k]=rs.getString(h);
h++;
k++;
}
}
k=0;h=0;
j++;
}
}
}
catch(Exception ex)
{ System.err.println(ex.getMessage());
ex.printStackTrace(System.err);
}
cp.setLayout(new GridLayout(rows+2,cols)); // 1 additional Row of Col heading, 1 for save btn
//---------------- Adding heading in CP---------------------------------------
for (int i = 0; i < cols; i++) {
JLabel jl = new JLabel(" [ "+heads[i]+" ] ");
jl.setOpaque(true);
jl.setBackground(Color.gray);
jl.setForeground(Color.white);
cp.add(jl);
}
//---------------- Adding data ---------------------------------------
for(int j=0; j<rows; j++){
for(int k=0; k<cols; k++)
{
if(k==(cols-1))
{ ref="-"+j+"."+k;
String status=cubeData[j][k]+ref;
stChange[j]=Integer.parseInt(rollno); // save previously selected status of each // row(student) + array address
Choice jc = new Choice();
jc.add("Present"+ref);
jc.add("Leave"+ref);
jc.add("Absent"+ref);
jc.select(status);
jc.addItemListener(this);
cp.add(jc);
}
else
cp.add(new JLabel(cubeData[j][k]));
rollno=cubeData[j][k];
}
}
addSaveButton();
}
//------------------------SAVE BUTTON-----------------------------------------
public void addSaveButton(){
JButton saveBtn = new JButton(" :::: Save :::: ");
saveBtn.addActionListener(this);
cp.add(saveBtn);
}
//------------------------Item Listener -----------------------------------------
public void itemStateChanged(ItemEvent ie) {
String s = (String)ie.getItem();
String ro = s.substring(s.indexOf("-")+1,s.indexOf("."));
String co = s.substring(s.indexOf(".")+1,s.length());
String stats = s.substring(0,s.indexOf("-"));
int roo = Integer.parseInt(ro);
coo = Integer.parseInt(co);
cubeData[roo][coo]=stats;
}
//------------------------Action Listener-----------------------------------------
public void actionPerformed(ActionEvent ae) {
try{
String create="CREATE TABLE civ_fourth (`Name` VARCHAR(50), `Regd_No` INT, `Status` VARCHAR(20) NOT NULL)";
con=DriverManager.getConnection("jdbc:mysql://localhost:3306/student","root","root");
stmt.executeUpdate(create);
//con.close();
}
catch(Exception ex)
{ System.err.println(ex.getMessage());
ex.printStackTrace(System.err);
}
try{
for(int j=0; j<rows; j++)
{
//String updt = "update civilfattnd set Status= '"+cubeData[j][coo]+"' where Regd_No="+stChange[j];
String ins="INSERT INTO civ_fourth (`Regd_No`, `Status`) VALUES('"+stChange[j]+","+cubeData[j][coo]+")";
con=DriverManager.getConnection("jdbc:mysql://localhost:3306/student","root","root");
//stmt.executeUpdate(updt);
PreparedStatement ps=con.prepareStatement(ins);
}
//this.con.commit();
con.setAutoCommit(true);
System.out.println("Records updated..!");
con.close();
}catch(Exception ex)
{ System.err.println(ex.getMessage());
ex.printStackTrace(System.err);
}
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
cp = new javax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("...:::Civil First Sem:::...");
setBounds(new java.awt.Rectangle(250, 250, 0, 0));
setLocationByPlatform(true);
cp.setBackground(new java.awt.Color(154, 95, 125));
javax.swing.GroupLayout cpLayout = new javax.swing.GroupLayout(cp);
cp.setLayout(cpLayout);
cpLayout.setHorizontalGroup(
cpLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 539, Short.MAX_VALUE)
);
cpLayout.setVerticalGroup(
cpLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 308, Short.MAX_VALUE)
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(cp, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(cp, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new civil_fst().setVisible(true);
}
});
}
But this code create a new table but problem is its not execute the query for insert. I tried a lot but not successes . Please help me
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