MySQL Record display in JTable


Create one Project > give name MYSQL_data_display_JTable
As we will be connecting to MySQL database , so we need to add mysql-connector.jar to connect to MySQL database. We will keep our MySQL data management code in a class my_mysal.java. Inside this class there is a method my_db_select() to collect records from MySQL table. This method my_db_select() will return an array with 4 rows of data and each having 5 columns. So we will declar one 2-D array first.
String[][] data = new String[4][5]; // [rows][columns]
We will connect to MySQL database and read details here on how to connect to MySQL and execute query. We will collect 4 rows only by using LIMIT query.
SELECT * FROM STUDENT LIMIT 0,4
Using this query we will get a record set of having first 4 rows of data from our student table.
We will loop through this record set to store each row data in our 2-D array data.
	int i=0;
	while(rs.next())  {
	 for(int j=0;j<5;j++) {
	 //System.out.print(rs.getString(j+1));
	 data[i][j]=rs.getString(j+1);
	 }
	 //System.out.println();
	 i=i+1;
	}
Once our data array is populated with rows , we can return the same to our main calling method.
return data;
In our JTable.java file we have already added one JTable. Learn more on how to add JTable here.

Now we will create one object of class my_mysql.java to access the object my_db_select() to get the data.
String[] column= {"ID","Name","Class","Mark","Sex"};
my_mysql obj=new my_mysql(); // Object is created

//Collect the data using the object obj.my_db_select()  with column 
jt1 = new javax.swing.JTable(obj.my_db_select(),column);
We have given the data input by using obj.my_db_select(). This runs the my_db_select() method of my_mysql.java class to get the 2-D array of 4 records.
Displaying records in JTable

JTable.java

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JScrollPane;

public class JTable extends JFrame {

	private JPanel contentPane;
	private javax.swing.JTable jt1;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					JTable frame = new JTable();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
public JTable() {
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	setBounds(100, 100, 400, 305);
	contentPane = new JPanel();
	contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
	setContentPane(contentPane);
	contentPane.setLayout(null);
		
	JScrollPane scrollPane = new JScrollPane();
	scrollPane.setBounds(10, 64, 366, 107);
	contentPane.add(scrollPane);
	//My_test obj=new My_test();// with test data
	my_mysql obj=new my_mysql();
		
	String[] column= {"ID","Name","Class","Mark","Sex"};
	
//jt1=new javax.swing.JTable(obj.my_test_select(),column);//test data
	jt1 = new javax.swing.JTable(obj.my_db_select(),column);
	scrollPane.setViewportView(jt1);
	}
}

my_mysql.java

import java.sql.*;
public class my_mysql {

public  String[][] my_db_select() {
////////////
String[][] data = new String[4][5]; // [rows][columns]
	
try{  
	Class.forName("com.mysql.jdbc.Driver");  
	Connection con=DriverManager.getConnection(  
	"jdbc:mysql://localhost:3306/my_tutorial","root","test");  
	Statement st=con.createStatement();  
	
  ResultSet rs=st.executeQuery("SELECT * FROM STUDENT LIMIT 0,4"); 
// Looping to store result in returning array data // 
	int i=0;
	while(rs.next())  {
	 for(int j=0;j<5;j++) {
	 //System.out.print(rs.getString(j+1));
	 data[i][j]=rs.getString(j+1);
	 }
	 //System.out.println();
	 i=i+1;
	}
// Below lines to check data before returning. // 	
/*		
 for (int x=0;x<data.length;x++) {
	 for (int y=0;(data[x]!= null && y <data[x].length);y++) {
		 System.out.print(data[x][y] + " ");
	 }
	 System.out.println();
 }
*/
con.close();  
}catch(Exception e){ System.out.println(e);} 
//////////////////////////////

return data;
	}
}




swing


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