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Old 06-29-2004, 01:08 AM   #1
keikun_naruchan
LQ Newbie
 
Registered: Feb 2004
Distribution: Suse, LFS(Linux From Scratch)
Posts: 20

Rep: Reputation: 0
Exclamation java prog with database


hi,

im creating a Java program that connects through a microsoft access database.. my plan is that I could manipulate the data through java.. I would like to view, add, edit and delete data.. so far im finished with view and delete but.. I seem to have a problem with my delete.. It doesn't seem to delete alphanumeric values (such as A1 or, A)

the following is my code.. anyone could you please help me..

I would appreciate suggestions from anyone of you..

Scenario:

if I input numbers for the emp_no to be deleted it works
but if I input alphanumeric for emp_no it doesn't work
emp_no is a field in my database it is the primary key and is of text data type..

Thanks in advance..

import java.sql.*;
import javax.sql.*;
import java.io.*;
import java.lang.*;
import java.util.*;

public class JDBCtest2
{
public static void Selection()
{
System.out.println("***********Employee Records Management************" + '\n');
System.out.println("What do you wish to do?");
System.out.println("Legend:");
System.out.println("To View Records: Enter v or V");
System.out.println("To Add a New Record: Enter a or A");
System.out.println("To Delete Records: Enter d or D");
System.out.println("To Quit Program: Enter q or Q");
System.out.print("Enter Choice:");
}
public static void main(String[] args) throws Exception
{
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
char input, rec_num;
String INPUT, record_num;
int x = 0, numinput;

try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String dataSourceName = "emp2ODBC";
String dbURL = "jdbcdbc:" + dataSourceName;
Connection con = DriverManager.getConnection(dbURL, "","");
Statement s = con.createStatement();

Selection();
//choice = stdin.readLine();
input = (char)System.in.read();
INPUT = in.readLine();

while(input!='Q' || input != 'q')
{
//if(choice.equalsIgnoreCase("v"))
if(input == 'v' || input == 'V')
{
System.out.println("");
s.execute("select * from employee");


System.out.println("Employee Records" + '\n');

//s.execute("select emp_title from Employee");
ResultSet rs = s.getResultSet();

// if rs == null, then there is no ResultSet to view
if (rs != null)

// this will step through our data row-by-row
while ( rs.next() )
{
//OUTPUT TO SCREEN

//System.out.println("Record Number: " + rs.getString(1) );
System.out.println("Employee Number: " + rs.getString("emp_no") );
System.out.println("Employee Name: " + rs.getString("emp_name") );
System.out.println("Employee Title: " + rs.getString("emp_title") );
System.out.println("Employee Department: " + rs.getString("emp_dept") );
System.out.println("Employee Contact Number: " + rs.getString("emp_contactno") + '\n');
}

System.out.println("End of Record");
System.out.println("-----------------------------------");
x=0;
Selection();
input = (char)System.in.read();
INPUT = in.readLine();

//break;
}
else if(input == 'd' || input == 'D')
{
System.out.print("Enter the Employee Number you wish to delete: ");

INPUT = in.readLine();
//input = (char)System.in.read();
//INPUT = in.readLine();
//rec_num = (char)System.in.read();
//record_num = in.readLine();
System.out.println("Input = " + INPUT);
//numinput = Integer.parseInt(record_num);
s.execute("delete * from employee where emp_no LIKE "+ INPUT +"");
//WHERE `id` IN (142,156,168)
s.execute("select * from employee");

System.out.println('\n' + "Remaining Employee Records" + '\n');
ResultSet rs = s.getResultSet();
if (rs != null)

while ( rs.next() )

{
//OUTPUT TO SCREEN
//x=x+1;

System.out.println("Employee Number: " + rs.getString("emp_no") );
System.out.println("Employee Name: " + rs.getString("emp_name") );
System.out.println("Employee Title: " + rs.getString("emp_title") );
System.out.println("Employee Department: " + rs.getString("emp_dept") );
System.out.println("Employee Contact Number: " + rs.getString("emp_contactno") + '\n');
}

System.out.println("End of Record");
System.out.println("-----------------------------------");
x=0;

Selection();
input = (char)System.in.read();
INPUT = in.readLine();
}
else if(input == 'q' || input == 'Q')
{
System.out.println('\n' + "EXITING PROGRAM..." + '\n');
System.exit(0);
}
else if(input == 'a' || input == 'A')
{
System.out.println('\n' + "asasasEXITING PROGRAM..." + '\n');
Selection();
input = (char)System.in.read();
INPUT = in.readLine();
}
else
{
System.out.println('\n' + "WARNING!!!" + '\n' + "You have entered incorrect command!" + '\n');
Selection();
input = (char)System.in.read();
INPUT = in.readLine();
}

}
// close the Statement to let the database know we're done with it
s.close();
// close the Connection to let the database know we're done with it
con.close();
}
catch (Exception err)
{
System.out.println("WARNING!!!: " + err);
//Selection();
//System.exit(0);
}
}
}
 
Old 06-29-2004, 04:15 PM   #2
coolman0stress
Member
 
Registered: Jun 2003
Location: Toronto, Ontario, Canada
Posts: 288

Rep: Reputation: 30
Some things that came to mind:

* try putting a single quote around your parameter:
"delete * from employee where emp_no LIKE ' "+ INPUT +"'"
* instead of throwing Exception from main, set up a try and catch around that particular block to check for possible errors (such as malformed sql statements).
 
  


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