*/
public Set<String> getInvokedTables() throws ParseException {
// Read all SQL statements from input
ZStatement st;
Set<String> tables=new HashSet<String>();
while((st = parser.readStatement()) != null) {
this.sql=st.toString();
if(st instanceof ZQuery) { // An SQL query: query the DB
getInvokedTables((ZQuery)st,tables);
}
break;
}