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POHow can I pass the table and field names as database query parameters?
 

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  1. POHow can I pass the table and field names as database query parameters?
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    <p>In the code below, I have a method named <code>Prj_Genrate_idAssgn</code> with formal parameters <code>String table, String Field_Name</code>. How can I can pass the database table name (<code>studentrecords</code>) and field name (<code>Reg_no</code>) as a parameters (<code>String table, String Field_name</code>)?</p> <pre><code>import java.awt.event.*; import javax.swing.*; import java.sql.*; public class dbtable2 extends javax.swing.JFrame implements ActionListener { JFrame frame; // JLabel lname = new JLabel("STUDENT NAME"); JLabel lreg = new JLabel("REGISTER NO"); JLabel lmark1 = new JLabel("MARK1"); JLabel lmark2 = new JLabel("MARK2"); JLabel ltotal = new JLabel("TOTAL"); JButton bsave = new JButton("SAVE"); JButton bupdate = new JButton("UPDATE"); JButton bdelete = new JButton("DELETE"); JTextField tname = new JTextField(20); JTextField treg = new JTextField(20); JTextField tmark1 = new JTextField(20); JTextField tmark2 = new JTextField(20); JTextField ttotal = new JTextField(20); Connection conn = null; CallableStatement calstat = null; Statement st = null; ResultSet rs = null; static String str = "table"; static String str1 = "Field_Name"; PreparedStatement pr = null; public dbtable2() { //setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame = new JFrame(); tmark1.addKeyListener(new TxAdapter()); tmark2.addKeyListener(new TxAdapter()); bsave.addActionListener(this); bupdate.addActionListener(this); bdelete.addActionListener(this); JPanel pnl = new JPanel(); pnl.add(lname); pnl.add(tname); pnl.add(lreg); pnl.add(treg); pnl.add(lmark1); pnl.add(tmark1); pnl.add(lmark2); pnl.add(tmark2); pnl.add(ltotal); pnl.add(ttotal); pnl.add(bsave); pnl.add(bupdate); pnl.add(bdelete); frame.add(pnl); frame.setSize(200, 100); frame.setVisible(true); initconn(); } public Connection initconn() { try { Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection( "jdbc:mysql://localhost:3306/records", "root", "root"); String table = "CREATE TABLE studentrecord(student_name varchar(20)," + "Reg_no int(6) PRIMARY KEY,mark1 int(3), mark2 int(3))"; st = conn.createStatement(); //st.executeUpdate(table); //conn.close(); } catch (Exception e) { System.out.println(e); } return conn; } public void Prj_Genrate_idAssgn(String table, String Field_Name) { try { String max = "select max(" + Field_Name + ") from" + table + ";"; int max1 = Integer.parseInt(max); System.out.println(max1); } catch (Exception e) { System.out.println(e); } } public static void main(String[] args) { dbtable2 dbtable2 = new dbtable2(); dbtable2.Prj_Genrate_idAssgn(str, str1); } } </code></pre>
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