The document contains Java code for connecting to a MySQL database and performing CRUD (create, read, update, delete) operations on a student record table. It includes code to insert, update, display, and delete student records by getting/setting values from text fields and JTables. Database connections are established using JDBC and queries are executed using Statement objects to manipulate student data in the database table.

2. private void jButton3ActionPerformed(java.awt.event.ActionEvent evt)
{
this.setVisible(false);
new DELREC().setVisible(true);
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
this.setVisible(false);
new ADDREC().setVisible(true);
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt)
{
this.setVisible(false);
new MODREC().setVisible(true);
}
private void jButton4ActionPerformed(java.awt.event.ActionEvent evt)
{
this.setVisible(false);
new DISPALL().setVisible(true);
}
private void jButton5ActionPerformed(java.awt.event.ActionEvent evt)
{

3. this.setVisible(false);
new DISPCLS().setVisible(true);
}
private void jButton6ActionPerformed(java.awt.event.ActionEvent evt)
{
this.setVisible(false);
new DISPREPORT().setVisible(true);
}

7. try
{
Class.forName("com.mysql.jdbc.Driver");
Connectioncon= (Connection)
DriverManager.getConnection("jdbc:mysql://localhost:3306/prashant","root","admin");
Statementsmt=(Statement)con.createStatement();
intrl =Integer.parseInt(rol.getText().trim());
Stringcname = na.getText().trim();
Stringcls = cl.getText().trim();
Stringstrm = st.getText().trim();
intpy = Integer.parseInt(ph.getText().trim());
intm=Integer.parseInt(ma.getText().trim());
intc=Integer.parseInt(ch.getText().trim());
intcmp=Integer.parseInt(co.getText().trim());
inte=Integer.parseInt(en.getText().trim());
inttotl=(py+m+c+cmp+e);
floatp=(float)(totl/5);
Stringgd;

8. if(p>=85)
gd="A";
else if(p>=75&& p<85)
gd="B";
else if(p>=65&& p<75)
gd="c";
else
gd="F";
StringstrSQL = "INSERT INTO
student(Roll_No,Name,Class,Stream,Physics,Maths,Chemistry,Computer,English,Total,Grade) VALUES
('"+(rl)+"','"+(cname)+"','"+(cls)+"','"+(strm)+"',"+(py)+","+(m)+","+(c)+","+(cmp)+","+(e)+","+(totl)+",'"+(gd)+"
')";
introwsEffected=smt.executeUpdate(strSQL);
JOptionPane.showMessageDialog(this,"Recordsuccessfullyinserted");
System.out.println(rowsEffected+" rowseffected");
smt.close();
con.close();
}
catch (Exceptione) {
JOptionPane.showMessageDialog(this,e.getMessage());
}
}

11. CODING

12. try
{
Class.forName("com.mysql.jdbc.Driver");
Connection con = (Connection)
DriverManager.getConnection("jdbc:mysql://localhost:3306/prashant","root","a
dmin");
Statement smt= (Statement) con.createStatement();
ResultSet rs=null;
String sna=jTextField1.getText().trim();
int no=Integer.parseInt(jTextField2.getText().trim());
String na=jTextField5.getText().trim();
String cl=jTextField3.getText().trim();
String st=jTextField4.getText().trim();
int py=Integer.parseInt(jTextField6.getText().trim());
int m=Integer.parseInt(jTextField7.getText().trim());
int c=Integer.parseInt(jTextField8.getText().trim());
int co=Integer.parseInt(jTextField9.getText().trim());
int en=Integer.parseInt(jTextField10.getText().trim());
jTextField11.setText(" ");
jTextField12.setText(" ");
int t=(py+m+c+co+en);
jTextField11.setText(" "+t);
int tt=Integer.parseInt(jTextField11.getText().trim());
float p=(float)(tt/5);
String gd;

13. if(p>=85)
gd="A";
else if(p>=75 && p<85)
gd="B";
else if(p>=65 && p<75)
gd="c";
else
gd="F";
jTextField12.setText(""+gd);
String gd1=jTextField12.getText().trim();
String qry="Updatestudentset
roll_no="+(no)+",name='"+(na)+"',class='"+(cl)+"',stream='"+(st)+"',physics="+(p
y)+",maths="+(m)+",chemistry="+(c)+",computer="+(co)+",english="+(en)+",tota
l="+(tt)+",grade='"+(gd1)+"' wherename='"+(sna)+"'";
int r=smt.executeUpdate(qry);
if(r==0)
JOptionPane.showMessageDialog(this,"record doesnotexixts");
else
JOptionPane.showMessageDialog(this,"record Upated");
con.close();
}
catch (Exception e)
{
JOptionPane.showMessageDialog(this,e.getMessage());
e.printStackTrace(); }

16. String cl = jTextField1.getText().trim();
DefaultTableModel model = (DefaultTableModel) jTable1.getModel();
int rows = model.getRowCount();
if (rows > 0) {
for (int i = 0; i < rows; i++) {
model.removeRow(0);

17. }
}
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection con = (Connection)
DriverManager.getConnection("jdbc:mysql://localhost:3306/prashant", "root", "admin");
Statement stmt = (Statement) con.createStatement();
String query = "SELECT * FROM Student where NAME='" + cl + "'";
ResultSet rs = stmt.executeQuery(query);
while (rs.next()) {
int rl = rs.getInt("roll_no");
String cName = rs.getString("name");
String cls = rs.getString("class");
String st = rs.getString("stream");
int py = rs.getInt("physics");
int m = rs.getInt("maths");
int c = rs.getInt("chemistry");
int co = rs.getInt("computer");
int en = rs.getInt("english");
int tt = rs.getInt("total");
String gd = rs.getString("grade");
System.out.println(rl + "|" + cName + "|" + cl);
model.addRow(new Object[]{rl, cName, cls, st, tt, gd});
}
} catch (Exception e) {

18. JOptionPane.showMessageDialog(this, e.getMessage());
}
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
String cl = jTextField1.getText().trim();
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection con = (Connection)
DriverManager.getConnection("jdbc:mysql://localhost:3306/ashok", "root", "akt");
Statement stmt = (Statement) con.createStatement();
String query = "DELETE FROM Student where NAME='" + cl + "'";
int r = stmt.executeUpdate(query);
if (r == 0) {
JOptionPane.showMessageDialog(this, "RECORD does not Exixts");
} else {
JOptionPane.showMessageDialog(this, "RECORD is Deleted Plz check the List");
}
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e.getMessage());
}
}

20. String query = "SELECT * FROM Student";
try {

21. Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection con = (Connection)
DriverManager.getConnection("jdbc:mysql://localhost:3306/prashant","root","admin");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(query);
while (rs.next()) {
int rl = rs.getInt("roll_no");
String cName = rs.getString("name");
String cl = rs.getString("class");
String st = rs.getString("stream");
int py = rs.getInt("physics");
int m = rs.getInt("maths");
int c = rs.getInt("chemistry");
int co = rs.getInt("computer");
int en = rs.getInt("english");
System.out.println(rl + "|" + cName + "|" + cl);
model.addRow(new Object[] {rl, cName, cl, st,py,m,c,co,en});
}
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e.getMessage());
}
}

23. String cl=jTextField1.getText().trim();

24. DefaultTableModel model = (DefaultTableModel) jTable1.getModel();
int rows = model.getRowCount();
if (rows > 0) {
for (int i = 0; i < rows; i++) {
model.removeRow(0);
}
}
String query = "SELECT * FROM Student where class='"+cl+"'";
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection con = (Connection)
DriverManager.getConnection("jdbc:mysql://localhost:3306/prashant","root","admin");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(query);
while (rs.next()) {
int rl = rs.getInt("roll_no");
String cName = rs.getString("name");
String cls = rs.getString("class");
String st = rs.getString("stream");
int py = rs.getInt("physics");
int m = rs.getInt("maths");
int c = rs.getInt("chemistry");
int co = rs.getInt("computer");
int en = rs.getInt("english");

25. System.out.println(rl + "|" + cName + "|" + cl);
model.addRow(new Object[] {rl, cName, cls, st,py,m,c,co,en});
}
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e.getMessage());
}
}

27. String sna=jTextField1.getText().trim();
String query = "SELECT * FROM Student where name='"+sna+"'";
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection con = (Connection)
DriverManager.getConnection("jdbc:mysql://localhost:3306/prashant","root","admin");
Statement stmt = (Statement) con.createStatement();
ResultSet rs = stmt.executeQuery(query);
while (rs.next()) {
jTextField2.setText(""+rs.getInt("roll_no"));
jTextField3.setText(""+rs.getString("name"));
jTextField4.setText(""+rs.getString("class"));
jTextField5.setText(""+rs.getString("stream"));

28. jTextField6.setText(""+rs.getInt("physics"));
jTextField7.setText(""+rs.getInt("maths"));
jTextField8.setText(""+rs.getInt("chemistry"));
jTextField9.setText(""+rs.getInt("computer"));
jTextField10.setText(""+rs.getInt("english"));
jTextField11.setText(""+rs.getInt("total"));
jTextField12.setText(""+rs.getString("grade"));
float
p=(float)(rs.getInt("physics")+rs.getInt("maths")+rs.getInt("chemistry")+rs.getInt("computer")+rs.ge
tInt("english"))/5;
jTextField13.setText(""+p);
}
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e.getMessage());
}
}