コード例 #1
0
  /**
   * Tests offset and limit clauses for query.
   *
   * @throws Exception If failed.
   */
  public void testOffsetLimit() throws Exception {
    IgniteCache<Integer, Integer> c =
        ignite(0).getOrCreateCache(cacheConfig("ints", true, Integer.class, Integer.class));

    try {
      List<Integer> res = new ArrayList<>();

      Random rnd = new GridRandom();

      for (int i = 0; i < 10; i++) {
        int val = rnd.nextInt(100);

        c.put(i, val);
        res.add(val);
      }

      Collections.sort(res);

      String qry = "select _val from Integer order by _val ";

      assertEqualsCollections(res, columnQuery(c, qry));
      assertEqualsCollections(res.subList(0, 0), columnQuery(c, qry + "limit ?", 0));
      assertEqualsCollections(res.subList(0, 3), columnQuery(c, qry + "limit ?", 3));
      assertEqualsCollections(res.subList(0, 9), columnQuery(c, qry + "limit ? offset ?", 9, 0));
      assertEqualsCollections(res.subList(3, 7), columnQuery(c, qry + "limit ? offset ?", 4, 3));
      assertEqualsCollections(res.subList(7, 9), columnQuery(c, qry + "limit ? offset ?", 2, 7));
      assertEqualsCollections(res.subList(8, 10), columnQuery(c, qry + "limit ? offset ?", 2, 8));
      assertEqualsCollections(res.subList(9, 10), columnQuery(c, qry + "limit ? offset ?", 1, 9));
      assertEqualsCollections(res.subList(10, 10), columnQuery(c, qry + "limit ? offset ?", 1, 10));
      assertEqualsCollections(
          res.subList(9, 10), columnQuery(c, qry + "limit ? offset abs(-(4 + ?))", 1, 5));
    } finally {
      c.destroy();
    }
  }