Examples of java.sql.ResultSet

java.sql.ResultSet
esultSet will be both scrollable and updateable
The ResultSet interface provides a series of methods for retrieving data from columns in the current row, such as getDate, getFloat. The columns are identified either by their index number (starting at 1) or by their name - there are separate methods for both techniques of column addressing. The column names are case insensitive. If several columns have the same name, then the getter methods use the first matching column. This means that if column names are used, it is not possible to guarantee that the name will retrieve data from the intended column - for certainty it is better to use column indexes. Ideally the columns should be read left-to-right and read once only, since not all * databases are optimised to handle other techniques of reading the data.
When reading data, the JDBC driver maps the SQL data retrieved from the database to the Java type implied by the method invoked by the application. The JDBC specification has a table of allowable mappings from SQL types to Java types.
There are also methods for writing data into the ResultSet, such as updateInt, updateString. The update methods can be used either to modify the data of an existing row or to insert new data rows into the ResultSet. Modification of existing data involves moving the Cursor to the row which needs modification and then using the update methods to modify the data, followed by calling the ResultSet.updateRow method. For insertion of new rows, the cursor is first moved to a special row called the Insert Row, data is added using the update methods, followed by calling the ResultSet.insertRow method.
A ResultSet is closed if the Statement object which generated it closed, executed again or is used to retrieve the next result from a sequence of results.

    }


    private void testValue() throws SQLException {
        Connection conn = getConnection("functions");
        Statement stat = conn.createStatement();
        ResultSet rs;
        stat.execute("create alias TO_CHAR for \"" + getClass().getName() + ".toChar\"");
        rs = stat.executeQuery("call TO_CHAR(TIMESTAMP '2001-02-03 04:05:06', 'format')");
        rs.next();
        assertEquals("2001-02-03 04:05:06.0", rs.getString(1));
        stat.execute("drop alias TO_CHAR");
        conn.close();
    }

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        Statement stat = conn.createStatement();


        stat.execute("create schema schema2");
        stat.execute("create alias schema2.func as 'int x() { return 1; }'");
        stat.execute("create view test as select schema2.func()");
        ResultSet rs;
        rs = stat.executeQuery("select * from information_schema.views");
        rs.next();
        assertTrue(rs.getString("VIEW_DEFINITION").indexOf("SCHEMA2.FUNC") >= 0);


        stat.execute("drop view test");
        stat.execute("drop schema schema2");


        conn.close();

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        String createSQL = "CREATE TABLE testGreatest (id BIGINT);";
        stat.execute(createSQL);
        stat.execute("insert into testGreatest values (1)");


        String query = "SELECT GREATEST(id, " + ((long) Integer.MAX_VALUE) + ") FROM testGreatest";
        ResultSet rs = stat.executeQuery(query);
        rs.next();
        Object o = rs.getObject(1);
        assertEquals(Long.class.getName(), o.getClass().getName());


        String query2 = "SELECT GREATEST(id, " + ((long) Integer.MAX_VALUE + 1) + ") FROM testGreatest";
        ResultSet rs2 = stat.executeQuery(query2);
        rs2.next();
        Object o2 = rs2.getObject(1);
        assertEquals(Long.class.getName(), o2.getClass().getName());


        conn.close();
    }

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    }


    private void testSource() throws SQLException {
        Connection conn = getConnection("functions");
        Statement stat = conn.createStatement();
        ResultSet rs;
        stat.execute("create force alias sayHi as 'String test(String name) {\n" +
                "return \"Hello \" + name;\n}'");
        rs = stat.executeQuery("SELECT ALIAS_NAME FROM INFORMATION_SCHEMA.FUNCTION_ALIASES");
        rs.next();
        assertEquals("SAY" + "HI", rs.getString(1));
        rs = stat.executeQuery("call sayHi('Joe')");
        rs.next();
        assertEquals("Hello Joe", rs.getString(1));
        if (!config.memory) {
            conn.close();
            conn = getConnection("functions");
            stat = conn.createStatement();
            rs = stat.executeQuery("call sayHi('Joe')");
            rs.next();
            assertEquals("Hello Joe", rs.getString(1));
        }
        stat.execute("drop alias sayHi");
        conn.close();
    }

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    }


    private void testDynamicArgumentAndReturn() throws SQLException {
        Connection conn = getConnection("functions");
        Statement stat = conn.createStatement();
        ResultSet rs;
        stat.execute("create alias dynamic deterministic for \"" + getClass().getName() + ".dynamic\"");
        setCount(0);
        rs = stat.executeQuery("call dynamic(('a', 1))[0]");
        rs.next();
        String a = rs.getString(1);
        assertEquals("a1", a);
        stat.execute("drop alias dynamic");
        conn.close();
    }

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    }


    private void testUUID() throws SQLException {
        Connection conn = getConnection("functions");
        Statement stat = conn.createStatement();
        ResultSet rs;


        stat.execute("create alias xorUUID for \""+getClass().getName()+".xorUUID\"");
        setCount(0);
        rs = stat.executeQuery("call xorUUID(random_uuid(), random_uuid())");
        rs.next();
        Object o = rs.getObject(1);
        assertEquals(UUID.class.toString(), o.getClass().toString());
        stat.execute("drop alias xorUUID");


        conn.close();
    }

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    }


    private void testDeterministic() throws SQLException {
        Connection conn = getConnection("functions");
        Statement stat = conn.createStatement();
        ResultSet rs;


        stat.execute("create alias getCount for \""+getClass().getName()+".getCount\"");
        setCount(0);
        rs = stat.executeQuery("select getCount() from system_range(1, 2)");
        rs.next();
        assertEquals(0, rs.getInt(1));
        rs.next();
        assertEquals(1, rs.getInt(1));
        stat.execute("drop alias getCount");


        stat.execute("create alias getCount deterministic for \""+getClass().getName()+".getCount\"");
        setCount(0);
        rs = stat.executeQuery("select getCount() from system_range(1, 2)");
        rs.next();
        assertEquals(0, rs.getInt(1));
        rs.next();
        assertEquals(0, rs.getInt(1));
        stat.execute("drop alias getCount");
        rs = stat.executeQuery("SELECT * FROM INFORMATION_SCHEMA.FUNCTION_ALIASES WHERE UPPER(ALIAS_NAME) = 'GET' || 'COUNT'");
        assertFalse(rs.next());
        stat.execute("create alias reverse deterministic for \""+getClass().getName()+".reverse\"");
        rs = stat.executeQuery("select reverse(x) from system_range(700, 700)");
        rs.next();
        assertEquals("007", rs.getString(1));
        stat.execute("drop alias reverse");


        conn.close();
    }

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            return;
        }
        Connection conn = getConnection("functions");
        Statement stat = conn.createStatement();
        stat.execute("create table test(id int)");
        ResultSet rs;
        rs = stat.executeQuery("call transaction_id()");
        rs.next();
        assertTrue(rs.getString(1) == null && rs.wasNull());
        stat.execute("insert into test values(1)");
        rs = stat.executeQuery("call transaction_id()");
        rs.next();
        assertTrue(rs.getString(1) == null && rs.wasNull());
        conn.setAutoCommit(false);
        stat.execute("delete from test");
        rs = stat.executeQuery("call transaction_id()");
        rs.next();
        assertTrue(rs.getString(1) != null);
        stat.execute("drop table test");
        conn.close();
    }

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        stat.execute("grant all on test to test");
        conn.close();


        conn = DriverManager.getConnection("jdbc:postgresql://localhost:5535/test", "test", "test");
        stat = conn.createStatement();
        ResultSet rs;


        stat.execute("prepare test(int, int) as select ?1*?2");
        rs = stat.executeQuery("execute test(3, 2)");
        rs.next();
        assertEquals(6, rs.getInt(1));
        stat.execute("deallocate test");


        PreparedStatement prep = conn.prepareStatement("insert into test values(?, ?)");
        ParameterMetaData meta = prep.getParameterMetaData();
        assertEquals(2, meta.getParameterCount());
        prep.setInt(1, 1);
        prep.setString(2, "Hello");
        prep.execute();
        rs = stat.executeQuery("select * from test");
        rs.next();


        ResultSetMetaData rsMeta = rs.getMetaData();
        assertEquals(Types.INTEGER, rsMeta.getColumnType(1));
        assertEquals(Types.VARCHAR, rsMeta.getColumnType(2));


        prep.close();
        assertEquals(1, rs.getInt(1));
        assertEquals("Hello", rs.getString(2));
        assertFalse(rs.next());
        prep = conn.prepareStatement("select * from test where id = ? and name = ?");
        prep.setInt(1, 1);
        prep.setString(2, "Hello");
        rs = prep.executeQuery();
        rs.next();
        assertEquals(1, rs.getInt(1));
        assertEquals("Hello", rs.getString(2));
        assertFalse(rs.next());
        rs.close();
        DatabaseMetaData dbMeta = conn.getMetaData();
        rs = dbMeta.getTables(null, null, "TEST", null);
        rs.next();
        assertEquals("TEST", rs.getString("TABLE_NAME"));
        assertFalse(rs.next());
        rs = dbMeta.getColumns(null, null, "TEST", null);
        rs.next();
        assertEquals("ID", rs.getString("COLUMN_NAME"));
        rs.next();
        assertEquals("NAME", rs.getString("COLUMN_NAME"));
        assertFalse(rs.next());
        rs = dbMeta.getIndexInfo(null, null, "TEST", false, false);
        // index info is currently disabled
        // rs.next();
        // assertEquals("TEST", rs.getString("TABLE_NAME"));
        // rs.next();
        // assertEquals("TEST", rs.getString("TABLE_NAME"));
        assertFalse(rs.next());
        rs = stat.executeQuery("select version(), pg_postmaster_start_time(), current_schema()");
        rs.next();
        String s = rs.getString(1);
        assertTrue(s.indexOf("H2") >= 0);
        assertTrue(s.indexOf("PostgreSQL") >= 0);
        s = rs.getString(2);
        s = rs.getString(3);
        assertEquals(s, "PUBLIC");
        assertFalse(rs.next());


        conn.setAutoCommit(false);
        stat.execute("delete from test");
        conn.rollback();
        stat.execute("update test set name = 'Hallo'");
        conn.commit();
        rs = stat.executeQuery("select * from test order by id");
        rs.next();
        assertEquals(1, rs.getInt(1));
        assertEquals("Hallo", rs.getString(2));
        assertFalse(rs.next());


        rs = stat.executeQuery("select id, name, pg_get_userbyid(id) from information_schema.users order by id");
        rs.next();
        assertEquals(rs.getString(2), rs.getString(3));
        assertFalse(rs.next());
        rs.close();


        rs = stat.executeQuery("select currTid2('x', 1)");
        rs.next();
        assertEquals(1, rs.getInt(1));


        rs = stat.executeQuery("select has_table_privilege('TEST', 'READ')");
        rs.next();
        assertTrue(rs.getBoolean(1));


        rs = stat.executeQuery("select has_database_privilege(1, 'READ')");
        rs.next();
        assertTrue(rs.getBoolean(1));




        rs = stat.executeQuery("select pg_get_userbyid(-1)");
        rs.next();
        assertEquals(null, rs.getString(1));


        rs = stat.executeQuery("select pg_encoding_to_char(0)");
        rs.next();
        assertEquals("SQL_ASCII", rs.getString(1));


        rs = stat.executeQuery("select pg_encoding_to_char(6)");
        rs.next();
        assertEquals("UTF8", rs.getString(1));


        rs = stat.executeQuery("select pg_encoding_to_char(8)");
        rs.next();
        assertEquals("LATIN1", rs.getString(1));


        rs = stat.executeQuery("select pg_encoding_to_char(20)");
        rs.next();
        assertEquals("UTF8", rs.getString(1));


        rs = stat.executeQuery("select pg_encoding_to_char(40)");
        rs.next();
        assertEquals("", rs.getString(1));


        rs = stat.executeQuery("select pg_get_oid('\"WRONG\"')");
        rs.next();
        assertEquals(0, rs.getInt(1));


        rs = stat.executeQuery("select pg_get_oid('TEST')");
        rs.next();
        assertTrue(rs.getInt(1) > 0);


        rs = stat.executeQuery("select pg_get_indexdef(0, 0, false)");
        rs.next();
        assertEquals("", rs.getString(1));


        rs = stat.executeQuery("select id from information_schema.indexes where index_name='IDX_TEST_NAME'");
        rs.next();
        int indexId = rs.getInt(1);


        rs = stat.executeQuery("select pg_get_indexdef("+indexId+", 0, false)");
        rs.next();
        assertEquals("CREATE INDEX PUBLIC.IDX_TEST_NAME ON PUBLIC.TEST(NAME, ID)", rs.getString(1));
        rs = stat.executeQuery("select pg_get_indexdef("+indexId+", null, false)");
        rs.next();
        assertEquals("CREATE INDEX PUBLIC.IDX_TEST_NAME ON PUBLIC.TEST(NAME, ID)", rs.getString(1));
        rs = stat.executeQuery("select pg_get_indexdef("+indexId+", 1, false)");
        rs.next();
        assertEquals("NAME", rs.getString(1));
        rs = stat.executeQuery("select pg_get_indexdef("+indexId+", 2, false)");
        rs.next();
        assertEquals("ID", rs.getString(1));


        conn.close();
    }

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        Connection conn = getConnection("functions");
        Statement stat = conn.createStatement();
        stat.execute("create alias no_op for \""+getClass().getName()+".noOp\"");
        PreparedStatement prep = conn.prepareStatement("select * from dual where no_op(1.6)=?");
        prep.setBigDecimal(1, new BigDecimal("1.6"));
        ResultSet rs = prep.executeQuery();
        assertTrue(rs.next());


        stat.execute("create aggregate agg_sum for \""+getClass().getName()+"\"");
        rs = stat.executeQuery("select agg_sum(1), sum(1.6) from dual");
        rs.next();
        assertEquals(1, rs.getMetaData().getScale(2));
        assertEquals(32767, rs.getMetaData().getScale(1));
        stat.executeQuery("select * from information_schema.function_aliases");
        conn.close();
    }

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