/**
* Returns a connection and removes it from list with opened connections if requested.
*
* @param ctx query context
* @param del flag indicating if connection has to be removed
* @return connection
* @throws QueryException query exception
*/
private Connection connection(final QueryContext ctx, final boolean del) throws QueryException {
final int id = (int) checkItr(expr[0].item(ctx, input));
final Object obj = ctx.jdbc.get(id);
if (obj == null || !(obj instanceof Connection)) NOCONN.thrw(input, id);
if (del) ctx.jdbc.remove(id);
return (Connection) obj;
}
/**
* Executes a query, update or prepared statement.
*
* @param ctx query context
* @return result
* @throws QueryException query exception
*/
private Iter execute(final QueryContext ctx) throws QueryException {
final int id = (int) checkItr(expr[0].item(ctx, input));
final Object obj = ctx.jdbc.get(id);
if (obj == null) throw NOCONN.thrw(input, id);
// Execute query or prepared statement
return obj instanceof Connection
? executeQuery((Connection) obj, ctx)
: executePrepStmt((PreparedStatement) obj, ctx);
}