Examples of java.sql.Statement

java.sql.Statement
Interface used for executing static SQL statements and returning their results. By default, an object implementing the Statement interface can returns results as ResultSets. For any given Statement object, only one ResultSet can be open at one time. A call to any of the execution methods of Statement will cause any previously created ResultSet object for that Statement to be closed implicitly.
To have multiple ResultSet objects open concurrently, multiple Statement objects must be used.

        deleteDb("multiConn");
        Connection c1 = getConnection("multiConn");
        Connection c2 = getConnection("multiConn");
        c1.setAutoCommit(false);
        c2.setAutoCommit(false);
        Statement s1 = c1.createStatement();
        s1.execute("DROP TABLE IF EXISTS MULTI_A");
        s1.execute("CREATE TABLE MULTI_A(ID INT, NAME VARCHAR(255))");
        s1.execute("INSERT INTO MULTI_A VALUES(0, '0-insert-A')");
        Statement s2 = c2.createStatement();
        s1.execute("DROP TABLE IF EXISTS MULTI_B");
        s1.execute("CREATE TABLE MULTI_B(ID INT, NAME VARCHAR(255))");
        s2.execute("INSERT INTO MULTI_B VALUES(0, '1-insert-B')");
        c1.commit();
        c2.rollback();
        s1.execute("INSERT INTO MULTI_A VALUES(1, '0-insert-C')");
        s2.execute("INSERT INTO MULTI_B VALUES(1, '1-insert-D')");
        c1.rollback();
        c2.commit();
        c1.close();
        c2.close();

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    assertTrue(rs.next());
    assertEquals(0, rs.getInt(1)); //no rows updated
  }
  
  @Test(expected=TeiidSQLException.class) public void testSystemMatViewsWithRowRefreshNoPk() throws Exception {
    Statement s = conn.createStatement();
    s.executeQuery("select * from (call refreshMatView('TEST.MATVIEW', false)) p");
    //prior to load refresh of a single row returns -1
    s.executeQuery("select * from (call refreshMatViewRow('TEST.MATVIEW', 0)) p");
  }

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    private void testOneConnectionPrepare() throws SQLException {
        deleteDb("manyObjects");
        SysProperties.runFinalize = false;
        Connection conn = getConnection("manyObjects");
        PreparedStatement prep;
        Statement stat;
        int size = getSize(10, 1000);
        for (int i = 0; i < size; i++) {
            conn.getMetaData();
        }
        for (int i = 0; i < size; i++) {
            conn.createStatement();
        }
        stat = conn.createStatement();
        stat.execute("CREATE TABLE TEST(ID INT PRIMARY KEY, NAME VARCHAR)");
        stat.execute("INSERT INTO TEST VALUES(1, 'Hello')");
        for (int i = 0; i < size; i++) {
            stat.executeQuery("SELECT * FROM TEST WHERE 1=0");
        }
        for (int i = 0; i < size; i++) {
            stat.executeQuery("SELECT * FROM TEST");
        }
        for (int i = 0; i < size; i++) {
            conn.prepareStatement("SELECT * FROM TEST");
        }
        prep = conn.prepareStatement("SELECT * FROM TEST WHERE 1=0");

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            assertEquals(3, call.getInt(1));
        }
    }


    private void testPrepare(Connection conn) throws SQLException {
        Statement stat = conn.createStatement();
        CallableStatement call;
        ResultSet rs;
        stat.execute("CREATE TABLE TEST(ID INT, NAME VARCHAR)");
        call = conn.prepareCall("INSERT INTO TEST VALUES(?, ?)");
        call.setInt(1, 1);
        call.setString(2, "Hello");
        call.execute();
        call = conn.prepareCall("SELECT * FROM TEST",
                ResultSet.TYPE_FORWARD_ONLY,
                ResultSet.CONCUR_READ_ONLY);
        rs = call.executeQuery();
        rs.next();
        assertEquals(1, rs.getInt(1));
        assertEquals("Hello", rs.getString(2));
        assertFalse(rs.next());
        call = conn.prepareCall("SELECT * FROM TEST",
                ResultSet.TYPE_FORWARD_ONLY,
                ResultSet.CONCUR_READ_ONLY,
                ResultSet.HOLD_CURSORS_OVER_COMMIT);
        rs = call.executeQuery();
        rs.next();
        assertEquals(1, rs.getInt(1));
        assertEquals("Hello", rs.getString(2));
        assertFalse(rs.next());
        stat.execute("CREATE ALIAS testCall FOR \"" + getClass().getName() + ".testCall\"");
        call = conn.prepareCall("{CALL testCall(?,?,?)}");
        call.setInt("A", 100);
        call.setString(2, "abc");
        long t = System.currentTimeMillis();
        call.setTimestamp("C", new Timestamp(t));

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        testLogMode(2);
    }


    private void testLogMode(int logMode) throws SQLException {
        Connection conn;
        Statement stat;
        ResultSet rs;
        conn = getConnection("transaction");
        stat = conn.createStatement();
        stat.execute("create table test(id int primary key) as select 1");
        stat.execute("set write_delay 0");
        stat.execute("set log " + logMode);
        rs = stat.executeQuery("select value from information_schema.settings where name = 'LOG'");
        rs.next();
        assertEquals(logMode, rs.getInt(1));
        stat.execute("insert into test values(2)");
        stat.execute("shutdown immediately");
        try {
            conn.close();
        } catch (SQLException e) {
            // expected
        }
        conn = getConnection("transaction");
        stat = conn.createStatement();
        rs = stat.executeQuery("select * from test order by id");
        assertTrue(rs.next());
        if (logMode != 0) {
            assertTrue(rs.next());
        }
        assertFalse(rs.next());
        stat.execute("drop table test");
        conn.close();
    }

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    private void testConcurrentSelectForUpdate() throws SQLException {
        deleteDb("transaction");
        Connection conn = getConnection("transaction");
        conn.setAutoCommit(false);
        Statement stat = conn.createStatement();
        stat.execute("create table test(id int primary key, name varchar)");
        stat.execute("insert into test values(1, 'Hello'), (2, 'World')");
        conn.commit();
        PreparedStatement prep = conn.prepareStatement("select * from test for update");
        prep.execute();
        Connection conn2 = getConnection("transaction");
        conn2.setAutoCommit(false);

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    private void testForUpdate() throws SQLException {
        deleteDb("transaction");
        Connection conn = getConnection("transaction");
        conn.setAutoCommit(false);
        Statement stat = conn.createStatement();
        stat.execute("create table test(id int primary key, name varchar)");
        stat.execute("insert into test values(1, 'Hello'), (2, 'World')");
        conn.commit();
        PreparedStatement prep = conn.prepareStatement("select * from test where id = 1 for update");
        prep.execute();
        // releases the lock
        conn.commit();
        prep.execute();
        Connection conn2 = getConnection("transaction");
        conn2.setAutoCommit(false);
        Statement stat2 = conn2.createStatement();
        if (config.mvcc && Constants.VERSION_MINOR >= 3) {
            stat2.execute("update test set name = 'Welt' where id = 2");
        }
        assertThrows(ErrorCode.LOCK_TIMEOUT_1, stat2).
                execute("update test set name = 'Hallo' where id = 1");
        conn2.close();
        conn.close();

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    }


    private void testRollback() throws SQLException {
        deleteDb("transaction");
        Connection conn = getConnection("transaction");
        Statement stat = conn.createStatement();
        stat.execute("create table test(id int)");
        stat.execute("create index idx_id on test(id)");
        stat.execute("insert into test values(1), (1), (1)");
        if (!config.memory) {
            conn.close();
            conn = getConnection("transaction");
            stat = conn.createStatement();
        }
        conn.setAutoCommit(false);
        stat.execute("delete from test");
        conn.rollback();
        ResultSet rs;
        rs = stat.executeQuery("select * from test");
        assertResultRowCount(3, rs);
        rs = stat.executeQuery("select * from test where id = 1");
        assertResultRowCount(3, rs);
        conn.close();


        conn = getConnection("transaction");
        stat = conn.createStatement();
        stat.execute("create table master(id int) as select 1");
        stat.execute("create table child1(id int references master(id) on delete cascade)");
        stat.execute("insert into child1 values(1), (1), (1)");
        stat.execute("create table child2(id int references master(id)) as select 1");
        if (!config.memory) {
            conn.close();
            conn = getConnection("transaction");
        }
        stat = conn.createStatement();
        assertThrows(ErrorCode.REFERENTIAL_INTEGRITY_VIOLATED_CHILD_EXISTS_1, stat).
                execute("delete from master");
        conn.rollback();
        rs = stat.executeQuery("select * from master where id=1");
        assertResultRowCount(1, rs);
        rs = stat.executeQuery("select * from child1");
        assertResultRowCount(3, rs);
        rs = stat.executeQuery("select * from child1 where id=1");
        assertResultRowCount(3, rs);
        conn.close();
    }

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    }


    private void testRollback2() throws SQLException {
        deleteDb("transaction");
        Connection conn = getConnection("transaction");
        Statement stat = conn.createStatement();
        stat.execute("create table test(id int)");
        stat.execute("create index idx_id on test(id)");
        stat.execute("insert into test values(1), (1)");
        if (!config.memory) {
            conn.close();
            conn = getConnection("transaction");
            stat = conn.createStatement();
        }
        conn.setAutoCommit(false);
        stat.execute("delete from test");
        conn.rollback();
        ResultSet rs;
        rs = stat.executeQuery("select * from test where id = 1");
        assertResultRowCount(2, rs);
        conn.close();


        conn = getConnection("transaction");
        stat = conn.createStatement();
        stat.execute("create table master(id int) as select 1");
        stat.execute("create table child1(id int references master(id) on delete cascade)");
        stat.execute("insert into child1 values(1), (1)");
        stat.execute("create table child2(id int references master(id)) as select 1");
        if (!config.memory) {
            conn.close();
            conn = getConnection("transaction");
        }
        stat = conn.createStatement();
        assertThrows(ErrorCode.REFERENTIAL_INTEGRITY_VIOLATED_CHILD_EXISTS_1, stat).
                execute("delete from master");
        rs = stat.executeQuery("select * from master where id=1");
        assertResultRowCount(1, rs);
        rs = stat.executeQuery("select * from child1 where id=1");
        assertResultRowCount(2, rs);
        conn.close();
    }

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    private void testSetTransaction() throws SQLException {
        deleteDb("transaction");
        Connection conn = getConnection("transaction");
        conn.setAutoCommit(false);
        Statement stat = conn.createStatement();
        stat.execute("create table test(id int)");
        stat.execute("insert into test values(1)");
        stat.execute("set @x = 1");
        conn.commit();
        assertSingleValue(stat, "select id from test", 1);
        assertSingleValue(stat, "call @x", 1);


        stat.execute("update test set id=2");
        stat.execute("set @x = 2");
        conn.rollback();
        assertSingleValue(stat, "select id from test", 1);
        assertSingleValue(stat, "call @x", 2);


        conn.close();

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