Mega Code Archive
Get hashtable keys from value
<![CDATA[
class keyhash
{
ResultSet rs;
Hashtable hash;
Vector v;
static int i;
Enumeration e;
public static void main(String[] args)
{
keyhash gs = new keyhash();
System.out.println("Hello World!");
gs.getresultset();
}
public void getresultset()
{
Hashtable hash = new Hashtable();
Vector v = new Vector();
boolean connected = dbConnect();
// Establish database connection here
if(connected == true)
{
try{
PreparedStatement getArticles = db.con.prepareStatement
("select * from xx where id = ?"
// sample query
)
String artid;
getArticles.setInt(1, 4);
//This passes integer 4 as a parameter in
//the sql query
rs = getArticles.executeQuery();
while (rs.next() == true)
{
key = rs.getString(1);
value = rs.getString(2);
hash.put(key,value);
//Hashtable populated
}
fillvector(hash,v);
getkeys(v);
rs.close();
}
catch(Exception ex){
ex.printStackTrace();
}
}
}
public void fillvector(Hashtable hash,Vector v)
{
int j=0;
boolean success;
Enumeration e = hash.keys();
while(e.hasMoreElements())
{
String key = (String)(e.nextElement());
String value = (String)hash.get(key);
if(value.matches("*****"))
//Put the value here to retrieve the
// corresponding keys
{
v.addElement(key);
//Add the corresponding keys to the vector
}
}
}
public void getkeys(Vector v)
{
Enumeration ev= v.elements();
while (ev.hasMoreElements())
{
System.out.println(ev.nextElement());
// Print the keys related to a single value
}
}
}
]]>