Creating menu in Java

[didi00]

Hi everyone.
So I get the code going now the question is:
How to make a menu in Java code?
For example:
1.create table
2.insert into table
3.select fro table
4.delete table...
Which will you choose: ex.1
and creates table
I mean like switch case in C++

import java.sql.*;

public class dbAccess
{
    public static void main(String[] args)
    {
        try
        {
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            String database = 
              "jdbc:odbc:Driver:myDB";
            Connection conn = DriverManager.getConnection(database, "", "");
            Statement s = conn.createStatement();
            
            // the 1st case: create a table
            String tableName = "myTable" + String.valueOf((int)(Math.random() * 1000.0));
            String createTable = "CREATE TABLE " + tableName + 
                                 " (id Integer, name Text(32))";
            s.execute(createTable); 
            
            // second case: enter value into table
            for(int i=0; i<25; i++)
            {
              String addRow = "INSERT INTO " + tableName + " VALUES ( " + 
                     String.valueOf((int) (Math.random() * 32767)) + ", 'Text Value " + 
                     String.valueOf(Math.random()) + "')";
              s.execute(addRow);
            }
            
            // this should be third case:Fetch table
            String selTable = "SELECT * FROM " + tableName;
            s.execute(selTable);
            ResultSet rs = s.getResultSet();
            while((rs!=null) && (rs.next()))
            {
                System.out.println(rs.getString(1) + " : " + rs.getString(2));
            }
            
            // this should be the 4: drop the table
            String dropTable = "DROP TABLE " + tableName;
            s.execute(dropTable);
            
            // close and cleanup
            s.close();
            conn.close();
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
    }
}

Help anyone???

[gunjannigam]

Hi everyone.
So I get the code going now the question is:
How to make a menu in Java code?
For example:
1.create table
2.insert into table
3.select fro table
4.delete table...
Which will you choose: ex.1
and creates table
I mean like switch case in C++

import java.sql.*;

public class dbAccess
{
    public static void main(String[] args)
    {
        try
        {
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            String database = 
              "jdbc:odbc:Driver:myDB";
            Connection conn = DriverManager.getConnection(database, "", "");
            Statement s = conn.createStatement();
            
            // the 1st case: create a table
            String tableName = "myTable" + String.valueOf((int)(Math.random() * 1000.0));
            String createTable = "CREATE TABLE " + tableName + 
                                 " (id Integer, name Text(32))";
            s.execute(createTable); 
            
            // second case: enter value into table
            for(int i=0; i<25; i++)
            {
              String addRow = "INSERT INTO " + tableName + " VALUES ( " + 
                     String.valueOf((int) (Math.random() * 32767)) + ", 'Text Value " + 
                     String.valueOf(Math.random()) + "')";
              s.execute(addRow);
            }
            
            // this should be third case:Fetch table
            String selTable = "SELECT * FROM " + tableName;
            s.execute(selTable);
            ResultSet rs = s.getResultSet();
            while((rs!=null) && (rs.next()))
            {
                System.out.println(rs.getString(1) + " : " + rs.getString(2));
            }
            
            // this should be the 4: drop the table
            String dropTable = "DROP TABLE " + tableName;
            s.execute(dropTable);
            
            // close and cleanup
            s.close();
            conn.close();
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
    }
}

Help anyone???

If you want a command line based menu, its similar to C++
Use print staements as you do in C++ and take the input
by Using either Scanner or DataInputStream and depending upon the input use switch case as you do in C++ (switch case only take integer input).
If you want GUI based (swing) menu u can use JMenuBar, JMenu and JMenuItem class and their listeners accordinly

[didi00]

Well I want to try with JMenu or something like that. I just want to make (for example) buttons for every case. Can someone give me some code example? And can I make it in the same class? I just want to make it simple and I don't want to make another class. THANKS!!!!!

[idcj]

If you want to use GUI compents like JMenu you will have to write java swing code for that.

Refer the JMenu tutorial for a clear example.

But if you are looking at a quick way for the user to make a selection and invoke it, try the following:

Object[] choices= {"create", "insert", "delete"};
String s = (String)JOptionPane.showInputDialog(
                    frame,
                    "Make a selection:",
                    "Your Menu Choices",
                    JOptionPane.PLAIN_MESSAGE,
                    null,
                    choices,
                    "create");
if ((s != null) && (s.length() > 0)) {
    if (s.equals("create")){
         // write your create code
    } else if (s.equals("delete")){
         // write your delete code
    }else if (s.equals("insert")) {
        // write your insert code
    }
}

[didi00]

Thanks a lot. I'm relatively new in Java and I've never worked with JMenu, but I'll try. If it doesn't work I'll go with the selection part.
THANKS A LOT!!!!!

[didi00]

I have one more question:
How to change this code so I could name the table:
For example create a table: "Table1", because here the table is already named. Also how to add your own data into the table, not random numbers like in this code.

// the 1st case: create a table
            String tableName = "myTable" + String.valueOf((int)(Math.random() * 1000.0));
            String createTable = "CREATE TABLE " + tableName + 
                                 " (id Integer, name Text(32))";
            s.execute(createTable);

and this:

// second case: enter value into table
            for(int i=0; i<25; i++)
            {
              String addRow = "INSERT INTO " + tableName + " VALUES ( " + 
                     String.valueOf((int) (Math.random() * 32767)) + ", 'Text Value " + 
                     String.valueOf(Math.random()) + "')";
              s.execute(addRow);
            }

Help with a little example code please?
THANK YOU!!!!

[gunjannigam]

I have one more question:
How to change this code so I could name the table:
For example create a table: "Table1", because here the table is already named.

// the 1st case: create a table
            String tableName = "myTable" + String.valueOf((int)(Math.random() * 1000.0));
            String createTable = "CREATE TABLE " + tableName + 
                                 " (id Integer, name Text(32))";
            s.execute(createTable);

String tableName = "Table1";

Also how to add your own data into the table, not random numbers like in this code.
and this:

// second case: enter value into table
            for(int i=0; i<25; i++)
            {
              String addRow = "INSERT INTO " + tableName + " VALUES ( " + 
                     String.valueOf((int) (Math.random() * 32767)) + ", 'Text Value " + 
                     String.valueOf(Math.random()) + "')";
              s.execute(addRow);
            }

Help with a little example code please?
THANK YOU!!!!

for(int i=0; i<25; i++)
            {
              int id = 123; // Here you can assign whatever ID you want
              String strid =  String.valueOf(id); 
              String name = "Ram"; //Here you can assign whatever name you want
              String addRow = "INSERT INTO " + tableName + " VALUES ( " + 
                     strid + ", '" + name + "')";
              s.execute(addRow);
            }

[didi00]

THANK YOU!!!!