/** * Checks if the query possibly performs updates. * * @param ctx database context * @param query query string * @return result of check */ final boolean updates(final Context ctx, final String query) { try { final Performance p = new Performance(); qp(query, ctx); parse(p); return qp.updating; } catch (final QueryException ex) { Util.debug(ex); exception = ex; qp.close(); return false; } }
/** * Evaluates the specified query. * * @param query query * @return success flag */ final boolean query(final String query) { final Performance p = new Performance(); String error; if (exception != null) { error = Util.message(exception); } else { try { long hits = 0; final boolean run = options.get(MainOptions.RUNQUERY); final boolean serial = options.get(MainOptions.SERIALIZE); final int runs = Math.max(1, options.get(MainOptions.RUNS)); for (int r = 0; r < runs; ++r) { // reuse existing processor instance if (r != 0) qp = null; qp(query, context); parse(p); if (r == 0) plan(false); qp.compile(); info.compiling += p.time(); if (r == 0) plan(true); if (!run) continue; final PrintOutput po = r == 0 && serial ? out : new NullOutput(); try (final Serializer ser = qp.getSerializer(po)) { if (maxResults >= 0) { result = qp.cache(maxResults); info.evaluating += p.time(); result.serialize(ser); hits = result.size(); } else { hits = 0; final Iter ir = qp.iter(); info.evaluating += p.time(); for (Item it; (it = ir.next()) != null; ) { ser.serialize(it); ++hits; checkStop(); } } } qp.close(); info.serializing += p.time(); } // dump some query info // out.flush(); // remove string list if global locking is used and if query is updating if (soptions.get(StaticOptions.GLOBALLOCK) && qp.updating) { info.readLocked = null; info.writeLocked = null; } return info(info.toString(qp, out.size(), hits, options.get(MainOptions.QUERYINFO))); } catch (final QueryException | IOException ex) { exception = ex; error = Util.message(ex); } catch (final ProcException ex) { error = INTERRUPTED; } catch (final StackOverflowError ex) { Util.debug(ex); error = BASX_STACKOVERFLOW.desc; } catch (final RuntimeException ex) { extError(""); Util.debug(info()); throw ex; } finally { // close processor after exceptions if (qp != null) qp.close(); } } return extError(error); }
/** Closes the query processor. */ protected void closeQp() { if (qp != null) { qp.close(); qp = null; } }