FOR CONNECTING JAVA(FRONTEND) WITH ANY BACKEND(MYSQL)

1. For database name “fahad” in mysql.
For table name “stu” under database “fahad”.

2. CONNECTIVITY CODING:
importjava.sql.*;
importjavax.swing.JOptionPane;
try
{
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connectioncon=(Connection)
DriverManager.getConnection("jdbc:mysql://localhost:3306/mannan","root","sds");
StringSQL="select* fromstu";

3. Statementstmt=con.createStatement();
ResultSetrs=stmt.executeQuery(SQL);
while(rs.next())
{
}
intANo=Integer.parseInt(jTextField1.getText());
StringSName=jTextField2.getText();
StringSclass=jTextField3.getText();
StringstrSQL="insertintostu(rno,sname,sclass) values('"+(ANo)+"','"+(SName)+"','"+(Sclass)+"')";
introweff=stmt.executeUpdate(strSQL);
JOptionPane.showMessageDialog(rootPane,"One row inserted");
con.close();
}
catch(Exceptione){
JOptionPane.showMessageDialog(this,e.getMessage());
}

4. MODIFY RECORD:
importjava.sql.*;
importjavax.swing.JOptionPane;
try
{
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connectioncon=(Connection)
DriverManager.getConnection("jdbc:mysql://localhost:3306/mannan","root","sds");
Statementst=con.createStatement();
intr=Integer.parseInt(jTextField1.getText());
Stringq="select* fromstu where rno='"+(r)+"'";
ResultSetrs=st.executeQuery(q);

5. while(rs.next())
{
intrno=rs.getInt("rno");
Stringsn=rs.getString("sname");
Stringsc=rs.getString("sclass");
jTextField2.setText(""+sn);
jTextField3.setText(""+sc);
}
con.close();
}
catch(Exceptione){
JOptionPane.showMessageDialog(this,e.getMessage());
}
}
private voidjButton2ActionPerformed(java.awt.event.ActionEventevt) {
try
{
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connectioncon=(Connection)
DriverManager.getConnection("jdbc:mysql://localhost:3306/mannan","root","sds");
Statementst=con.createStatement();

6. intr=Integer.parseInt(jTextField1.getText());
Stringsn=jTextField2.getText();
Stringsc=jTextField3.getText();
Stringq="update stusetsname='"+(sn)+"',sclass='"+(sc)+"'whererno='"+(r)+"'";
introw=st.executeUpdate(q);
JOptionPane.showMessageDialog(rootPane,"recordupdated");
con.close();
}
catch(Exceptione){
JOptionPane.showMessageDialog(this,e.getMessage());
}
DISPLAYING RECORDIN TABLE:
importjava.sql.*;

7. importjavax.swing.JOptionPane;
importjavax.swing.table.*;
try
{
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connectioncon=(Connection)
DriverManager.getConnection("jdbc:mysql://localhost:3306/mannan","root","sds");
Statementstmt=con.createStatement();
Stringq="select* fromstu";
ResultSetrs=stmt.executeQuery(q);
DefaultTableModel m=(DefaultTableModel)jTable1.getModel();
introws=m.getRowCount();
if (rows>0)
{
for(inti=0;i<rows;i++)
{
m.removeRow(0);
}
}
while (rs.next())
{
Stringr=rs.getString("rno");

8. Stringsn=rs.getString("sname");
Stringsc=rs.getString("sclass");
m.addRow(newObject[]{r,sn,sc});
}
con.close();
} catch(Exceptione){
JOptionPane.showMessageDialog(this,e.getMessage());
}
DELETINGA RECORD:
importjava.sql.*;
importjavax.swing.JOptionPane;
try

9. {
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connectioncon=(Connection)
DriverManager.getConnection("jdbc:mysql://localhost:3306/mannan","root","sds");
//StringSQL="select*fromstu";
Statementstmt=con.createStatement();
intr=Integer.parseInt(jTextField1.getText());
Stringq="delete fromstuwhere rno='"+(r)+"'";
introw=stmt.executeUpdate(q);
JOptionPane.showMessageDialog(rootPane,"recorddeleted");
con.close();
}
catch(Exceptione){
JOptionPane.showMessageDialog(this,e.getMessage());
}