Examples of org.h2.util.Task.execute()

org.h2.util.Task.execute()
Start the thread. @return this

        db.execute("create table test1(a int, b int, c int)");
        db.execute("insert into test0 select x / 100, mod(x / 10, 10), mod(x, 10) from system_range(0, 999)");
        db.execute("update test0 set a = null where a = 9");
        db.execute("update test0 set b = null where b = 9");
        db.execute("update test0 set c = null where c = 9");
        db.execute("insert into test1 select * from test0");


        // this failed at some point
        Prepared p = db.prepare("select * from test0 where b in(" +
                "select a from test1 where a <? and a not in(" +
                "select c from test1 where b <=10 and a in(" +

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                    prep1.setString(j + 1, value);
                }
                assertEquals("seed: " + seed + " " + condition, rs0, rs1);
            }
        }
        db.execute("drop table test0, test1");
    }


    private String getRandomCondition(Random random, ArrayList<String> params,
            String[] columns, String[] compares, String[] values) {
        int comp = 1 + random.nextInt(4);

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        return buff.toString();
    }


    private void testInSelect() {
        Db db = new Db(conn);
        db.execute("CREATE TABLE TEST(A INT, B INT)");
        db.execute("CREATE INDEX IDX ON TEST(A)");
        db.execute("INSERT INTO TEST SELECT X/4, MOD(X, 4) FROM SYSTEM_RANGE(1, 16)");
        db.execute("UPDATE TEST SET A = NULL WHERE A = 0");
        db.execute("UPDATE TEST SET B = NULL WHERE B = 0");
        Random random = new Random();

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    }


    private void testInSelect() {
        Db db = new Db(conn);
        db.execute("CREATE TABLE TEST(A INT, B INT)");
        db.execute("CREATE INDEX IDX ON TEST(A)");
        db.execute("INSERT INTO TEST SELECT X/4, MOD(X, 4) FROM SYSTEM_RANGE(1, 16)");
        db.execute("UPDATE TEST SET A = NULL WHERE A = 0");
        db.execute("UPDATE TEST SET B = NULL WHERE B = 0");
        Random random = new Random();
        long seed = random.nextLong();

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    private void testInSelect() {
        Db db = new Db(conn);
        db.execute("CREATE TABLE TEST(A INT, B INT)");
        db.execute("CREATE INDEX IDX ON TEST(A)");
        db.execute("INSERT INTO TEST SELECT X/4, MOD(X, 4) FROM SYSTEM_RANGE(1, 16)");
        db.execute("UPDATE TEST SET A = NULL WHERE A = 0");
        db.execute("UPDATE TEST SET B = NULL WHERE B = 0");
        Random random = new Random();
        long seed = random.nextLong();
        println("seed: " + seed);

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    private void testInSelect() {
        Db db = new Db(conn);
        db.execute("CREATE TABLE TEST(A INT, B INT)");
        db.execute("CREATE INDEX IDX ON TEST(A)");
        db.execute("INSERT INTO TEST SELECT X/4, MOD(X, 4) FROM SYSTEM_RANGE(1, 16)");
        db.execute("UPDATE TEST SET A = NULL WHERE A = 0");
        db.execute("UPDATE TEST SET B = NULL WHERE B = 0");
        Random random = new Random();
        long seed = random.nextLong();
        println("seed: " + seed);
        for (int i = 0; i < 100; i++) {

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        Db db = new Db(conn);
        db.execute("CREATE TABLE TEST(A INT, B INT)");
        db.execute("CREATE INDEX IDX ON TEST(A)");
        db.execute("INSERT INTO TEST SELECT X/4, MOD(X, 4) FROM SYSTEM_RANGE(1, 16)");
        db.execute("UPDATE TEST SET A = NULL WHERE A = 0");
        db.execute("UPDATE TEST SET B = NULL WHERE B = 0");
        Random random = new Random();
        long seed = random.nextLong();
        println("seed: " + seed);
        for (int i = 0; i < 100; i++) {
            String column = random.nextBoolean() ? "A" : "B";

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                "IN(SELECT " + value + " FROM TEST I WHERE I." + compare + "=?) ORDER BY 1, 2";
            List<Map<String, Object>> a = db.prepare(sql1).set(x).query();
            List<Map<String, Object>> b = db.prepare(sql2).set(x).query();
            assertTrue("seed: " + seed + " sql: " + sql1 + " a: " + a + " b: " + b, a.equals(b));
        }
        db.execute("DROP TABLE TEST");
    }


    private void testGroupSorted() {
        Db db = new Db(conn);
        db.execute("CREATE TABLE TEST(A INT, B INT, C INT)");

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        db.execute("DROP TABLE TEST");
    }


    private void testGroupSorted() {
        Db db = new Db(conn);
        db.execute("CREATE TABLE TEST(A INT, B INT, C INT)");
        Random random = new Random();
        long seed = random.nextLong();
        println("seed: " + seed);
        for (int i = 0; i < 100; i++) {
            Prepared p = db.prepare("INSERT INTO TEST VALUES(?, ?, ?)");

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            p.set(new String[] { null, "0", "1", "2" }[random.nextInt(4)]);
            p.execute();
        }
        int len = getSize(1000, 3000);
        for (int i = 0; i < len / 10; i++) {
            db.execute("CREATE TABLE TEST_INDEXED AS SELECT * FROM TEST");
            int jLen = 1 + random.nextInt(2);
            for (int j = 0; j < jLen; j++) {
                String x = "CREATE INDEX IDX" + j + " ON TEST_INDEXED(";
                int kLen = 1 + random.nextInt(2);
                for (int k = 0; k < kLen; k++) {

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