Examples with Set org.h2.command.dml.Set used on opensource projects

Example 46 with Set

use of org.h2.command.dml.Set in project h2database by h2database.

the class TestPerfectHash method testMinimal.

private int testMinimal(int size) {
    Random r = new Random(size);
    HashSet<Long> set = new HashSet<>(size);
    while (set.size() < size) {
        set.add((long) r.nextInt());
    }
    LongHash hf = new LongHash();
    byte[] desc = MinimalPerfectHash.generate(set, hf);
    int max = testMinimal(desc, set, hf);
    assertEquals(size - 1, max);
    return desc.length * 8;
}

Example 47 with Set

use of org.h2.command.dml.Set in project h2database by h2database.

the class TestPerfectHash method testMinimalWithString.

private int testMinimalWithString(int size) {
    Random r = new Random(size);
    HashSet<String> set = new HashSet<>(size);
    while (set.size() < size) {
        set.add("x " + r.nextDouble());
    }
    StringHash hf = new StringHash();
    byte[] desc = MinimalPerfectHash.generate(set, hf);
    int max = testMinimal(desc, set, hf);
    assertEquals(size - 1, max);
    return desc.length * 8;
}

Example 48 with Set

use of org.h2.command.dml.Set in project h2database by h2database.

the class TestPerfectHash method testBrokenHashFunction.

private void testBrokenHashFunction() {
    int size = 10000;
    Random r = new Random(10000);
    HashSet<String> set = new HashSet<>(size);
    while (set.size() < size) {
        set.add("x " + r.nextDouble());
    }
    for (int test = 1; test < 10; test++) {
        final int badUntilLevel = test;
        UniversalHash<String> badHash = new UniversalHash<String>() {

            @Override
            public int hashCode(String o, int index, int seed) {
                if (index < badUntilLevel) {
                    return 0;
                }
                return StringHash.getFastHash(o, index, seed);
            }
        };
        byte[] desc = MinimalPerfectHash.generate(set, badHash);
        testMinimal(desc, set, badHash);
    }
}

Example 49 with Set

use of org.h2.command.dml.Set in project h2database by h2database.

the class TestPerfectHash method testMinimal.

private <K> int testMinimal(byte[] desc, Set<K> set, UniversalHash<K> hf) {
    int max = -1;
    BitSet test = new BitSet();
    MinimalPerfectHash<K> hash = new MinimalPerfectHash<>(desc, hf);
    for (K x : set) {
        int h = hash.get(x);
        assertTrue(h >= 0);
        assertTrue(h <= set.size() * 3);
        max = Math.max(max, h);
        assertFalse(test.get(h));
        test.set(h);
    }
    return max;
}

Example 50 with Set

use of org.h2.command.dml.Set in project h2database by h2database.

the class TestRecovery method testCompressedAndUncompressed.

private void testCompressedAndUncompressed() throws SQLException {
    DeleteDbFiles.execute(getBaseDir(), "recovery", true);
    DeleteDbFiles.execute(getBaseDir(), "recovery2", true);
    org.h2.Driver.load();
    Connection conn = getConnection("recovery");
    Statement stat = conn.createStatement();
    stat.execute("create table test(id int primary key, data clob)");
    stat.execute("insert into test values(1, space(10000))");
    stat.execute("set compress_lob lzf");
    stat.execute("insert into test values(2, space(10000))");
    conn.close();
    Recover rec = new Recover();
    rec.runTool("-dir", getBaseDir(), "-db", "recovery");
    Connection conn2 = getConnection("recovery2");
    Statement stat2 = conn2.createStatement();
    String name = "recovery.h2.sql";
    stat2.execute("runscript from '" + getBaseDir() + "/" + name + "'");
    stat2.execute("select * from test");
    conn2.close();
    conn = getConnection("recovery");
    stat = conn.createStatement();
    conn2 = getConnection("recovery2");
    stat2 = conn2.createStatement();
    assertEqualDatabases(stat, stat2);
    conn.close();
    conn2.close();
    DeleteDbFiles.execute(getBaseDir(), "recovery", true);
    DeleteDbFiles.execute(getBaseDir(), "recovery2", true);
}