Develop Reference

jtextfiled not retrieving the value picked from combobox

I want retrieve the value picked from combo box to jtextfield. As per my UI combobox is in 4th. So I coded:
pst.setString(4, (String)cmbPaySub.getSelectedItem());
and the error pop-up:
Parameter index out of range.(4> number of parameters, which is 1".
I tried by coding;
pst.setString(1, (String)cmbPaySub.getSelectedItem());
Neither error will pop-up and value also not picking up.
private void cmbPaySubActionPerformed(java.awt.event.ActionEvent evt) {
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/sipnena", "root", "");
String sql="select * from payments where cmbSubject=?";
PreparedStatement pst=con.prepareStatement(sql);
pst.setString(4, (String)cmbPaySub.getSelectedItem());
ResultSet rs=pst.executeQuery();
while(rs.next()){
txtFee.setText(rs.getString("Fee"));
}
}
catch(Exception e){
JOptionPane.showMessageDialog(null, e);
}
}
Kindly help me to retrieve the value to the jtextfield.

When reading the result you're replacing the entire text by the result's value in a loop so only the last value will show:
while(rs.next()){
txtFee.setText(rs.getString("Fee"));
}
You should concatenate all the values, and then set the text:
StringBuilder text = new StringBuilder();
while(rs.next()){
text.append(rs.getString("Fee"));
text.append("\n");
}
txtFee.setText(text.toString());

com.microsoft.sqlserver.jdbc.SQLServerException :The value is not set for the parameter number 4

I am facing the above-mentioned error in the following code. Please help me to fix this.
private void But_AddIncomeActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
try{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
String url="jdbc:sqlserver://localhost:1433;databasename=DB_Project;user=User;Password=password";
Connection con= DriverManager.getConnection(url);
String query = "insert into tbl_Reg(FullName,CNIC,Email_Address,Pswd,Adrs,PhoneNo)values(?,?,?,?,?,?)";
PreparedStatement pst=con.prepareStatement(query);
pst.setString (1,((JTextField)DateChooser.getDateEditor().getUiComponent()).getText());
pst.setString(2,Amnt_TF.getText());
pst.setString(3,Src_TF.getText());
pst.execute();
JOptionPane.showMessageDialog(null,"Income Detail Updated");
}
catch(Exception e){
JOptionPane.showMessageDialog(null,e);
}
}

Your query has 6 parameters (6 ? in SQL) but you set only 3 (with setString() method).
You need to set all 6 to avoid this exception.

Error with Oracle 10g auto-incremented sequence

I created a sequence in Oracle 10g because I have to increase case_number field auto_incremently. But I'm getting an error.
private void button_saveandsubmitActionPerformed(java.awt.event.ActionEvent evt) {
con = JavaConnectDB.ConnectDB();
try{
String sql="insert into FIR_form values(case_number_sequence,?,?,?,?,?,?,?,?,?,?,?)";
pst = (OraclePreparedStatement) con.prepareStatement(sql);
pst.setString(1,text_date.getText());
pst.setString(2,text_district.getText());
pst.setString(3,text_subject.getText());
pst.setString(4,text_description.getText());
pst.setString(5,text_cfullname.getText());
pst.setString(6,text_fhname.getText());
pst.setString(7,text_caddress.getText());
pst.setString(8,text_contact.getText());
pst.setString(9,text_suspectfullname.getText());
pst.setString(10,text_suspectaddress.getText());
pst.setString(11,text_suspectdescription.getText());
rs = (OracleResultSet) pst.executeQuery();
if(rs.next()){
JOptionPane.showMessageDialog(null, "the FIR has been added successfully!!!");
con.close();
this.dispose();
}
else{
JOptionPane.showMessageDialog(null, "enter all fields appropriately first!!!");
}
con.close();
}catch(Exception e){
JOptionPane.showMessageDialog(null, "An error occured. try again later !!!");
}
}

The field in the table will not auto-populate because you have defined a sequence. You must either reference the sequence.nextval in your insert statement to insert the value, or add a trigger to the table to populate the column from the sequence.
See this post for an example:

Java sql execute with more variable

I have a frame with 50 label, i can select them, for example i select A1,A2,A3,A4 the program save these in string (String=A1;A2;A3;A4) and i want to call in this query
try{
String sql= "UPDATE Teremszekek SET Állapot='Foglalt' where Terem='1' and Szék='A1' and DKód='1' ";
PreparedStatement pst=conn.prepareStatement(sql);
pst.execute();
}catch(Exception e){
System.out.println(e);
}
}
Állapot=condition(available,unavailable) Terem=room(index of room) Szék=chair DKód=Date code
How can i write that if i choose, A1,A2,A3,A4 etc label then it paste to query
//i select them at the same time

If I understand your question in the right way, this should be your solution:
String sql= "UPDATE Teremszekek SET Állapot='Foglalt' where Terem='1' and Szék=? and DKód='1' ";
pst.setString(1, yourValue);

Updating Values Netbeans

I am trying to Update my data from my netbeans to sqlite. there is no problem with the query but when I run the program a message box will appear "java.sql.SQLException:query does not return results". What seems to be the problem?
try{
String value1=txtId.getText();
String value2=txtFirst.getText();
String value3=txtLast.getText();
String value4=txtUser.getText();
String value5=txtPass.getText();
String sql="Update account set id='"+value1+"', fname='"+value2+"', lname='"+value3+"',username='"+value4+"', password='"+value5+"' where id='"+value1+"' ";
pst=conn.prepareStatement(sql);
rs=pst.executeQuery();
JOptionPane.showMessageDialog(null,"Data Updated");
}
catch(SQLException e){
JOptionPane.showMessageDialog(null,e);
}

int updateCount = pst.executeUpdate();
Instead of executeQuery.

Update query:
st.executeUpdate("update reservation set busname='"+jTextField10.getText()+"',busno='"+jTextField9.getText()+"',cusname='"+jTextField8.getText()+"',noofpass='"+jTextField7.getText()+"',amount='"+jTextField6.getText()+"' where cusname='"+jTextField8.getText()+"' ");

You can also try:
String strQuery = ("update visitor set name='"+jTextField10.getText()+"',bus_no='"+jTextField9.getText()+"',cus_name='"+jTextField8.getText()+"',Date='"+jTextField7.getText()+"',amount='"+jTextField6.getText()+"' where _ID='"+jTextField8.getText()+"' ");