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 testMathFunctions() throws SQLException {
        Connection conn = getConnection("functions");
        Statement stat = conn.createStatement();
        ResultSet rs = stat.executeQuery("CALL SINH(50)");
        assertTrue(rs.next());
        assertEquals(Math.sinh(50), rs.getDouble(1));
        rs = stat.executeQuery("CALL COSH(50)");
        assertTrue(rs.next());
        assertEquals(Math.cosh(50), rs.getDouble(1));
        rs = stat.executeQuery("CALL TANH(50)");
        assertTrue(rs.next());
        assertEquals(Math.tanh(50), rs.getDouble(1));
        conn.close();
    }

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//## Java 1.5 begin ##
        Connection conn = getConnection("functions");
        Statement stat = conn.createStatement();
        stat.execute("CREATE ALIAS mean FOR \"" +
                getClass().getName() + ".mean\"");
        ResultSet rs = stat.executeQuery(
                "select mean(), mean(10), mean(10, 20), mean(10, 20, 30)");
        rs.next();
        assertEquals(1.0, rs.getDouble(1));
        assertEquals(10.0, rs.getDouble(2));
        assertEquals(15.0, rs.getDouble(3));
        assertEquals(20.0, rs.getDouble(4));


        stat.execute("CREATE ALIAS mean2 FOR \"" +
                getClass().getName() + ".mean2\"");
        rs = stat.executeQuery(
                "select mean2(), mean2(10), mean2(10, 20)");
        rs.next();
        assertEquals(Double.NaN, rs.getDouble(1));
        assertEquals(10.0, rs.getDouble(2));
        assertEquals(15.0, rs.getDouble(3));


        DatabaseMetaData meta = conn.getMetaData();
        rs = meta.getProcedureColumns(null, null, "MEAN2", null);
        assertTrue(rs.next());
        assertEquals("FUNCTIONS", rs.getString("PROCEDURE_CAT"));
        assertEquals("PUBLIC", rs.getString("PROCEDURE_SCHEM"));
        assertEquals("MEAN2", rs.getString("PROCEDURE_NAME"));
        assertEquals("P2", rs.getString("COLUMN_NAME"));
        assertEquals(DatabaseMetaData.procedureColumnIn, rs.getInt("COLUMN_TYPE"));
        assertEquals("OTHER", rs.getString("TYPE_NAME"));
        assertEquals(Integer.MAX_VALUE, rs.getInt("PRECISION"));
        assertEquals(Integer.MAX_VALUE, rs.getInt("LENGTH"));
        assertEquals(0, rs.getInt("SCALE"));
        assertEquals(DatabaseMetaData.columnNullable, rs.getInt("NULLABLE"));
        assertEquals("", rs.getString("REMARKS"));
        assertEquals(null, rs.getString("COLUMN_DEF"));
        assertEquals(0, rs.getInt("SQL_DATA_TYPE"));
        assertEquals(0, rs.getInt("SQL_DATETIME_SUB"));
        assertEquals(0, rs.getInt("CHAR_OCTET_LENGTH"));
        assertEquals(1, rs.getInt("ORDINAL_POSITION"));
        assertEquals("YES", rs.getString("IS_NULLABLE"));
        assertEquals("MEAN2", rs.getString("SPECIFIC_NAME"));
        assertFalse(rs.next());


        stat.execute("CREATE ALIAS printMean FOR \"" +
                getClass().getName() + ".printMean\"");
        rs = stat.executeQuery(
                "select printMean('A'), printMean('A', 10), " +
                "printMean('BB', 10, 20), printMean ('CCC', 10, 20, 30)");
        rs.next();
        assertEquals("A: 0", rs.getString(1));
        assertEquals("A: 10", rs.getString(2));
        assertEquals("BB: 15", rs.getString(3));
        assertEquals("CCC: 20", rs.getString(4));
        conn.close();
//## Java 1.5 end ##
    }

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        String fileName = getBaseDir() + "/test.txt";
        Properties prop = System.getProperties();
        OutputStream out = IOUtils.openFileOutputStream(fileName, false);
        prop.store(out, "");
        out.close();
        ResultSet rs = stat.executeQuery("SELECT LENGTH(FILE_READ('" + fileName + "')) LEN");
        rs.next();
        assertEquals(IOUtils.length(fileName), rs.getInt(1));
        rs = stat.executeQuery("SELECT FILE_READ('" + fileName + "') PROP");
        rs.next();
        Properties p2 = new Properties();
        p2.load(rs.getBinaryStream(1));
        assertEquals(prop.size(), p2.size());
        rs = stat.executeQuery("SELECT FILE_READ('" + fileName + "', NULL) PROP");
        rs.next();
        String ps = rs.getString(1);
        InputStreamReader r = new InputStreamReader(IOUtils.openFileInputStream(fileName));
        String ps2 = IOUtils.readStringAndClose(r, -1);
        assertEquals(ps, ps2);
        conn.close();
        IOUtils.delete(fileName);

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        deleteDb("functions");
        Connection conn = getConnection("functions");
        Statement stat = conn.createStatement();
        stat.execute("CREATE AGGREGATE MEDIAN FOR \"" + MedianString.class.getName() + "\"");
        stat.execute("CREATE AGGREGATE IF NOT EXISTS MEDIAN FOR \"" + MedianString.class.getName() + "\"");
        ResultSet rs = stat.executeQuery("SELECT MEDIAN(X) FROM SYSTEM_RANGE(1, 9)");
        rs.next();
        assertEquals("5", rs.getString(1));
        conn.close();


        if (config.memory) {
            return;
        }


        conn = getConnection("functions");
        stat = conn.createStatement();
        stat.executeQuery("SELECT MEDIAN(X) FROM SYSTEM_RANGE(1, 9)");
        DatabaseMetaData meta = conn.getMetaData();
        rs = meta.getProcedures(null, null, "MEDIAN");
        assertTrue(rs.next());
        assertFalse(rs.next());
        rs = stat.executeQuery("SCRIPT");
        boolean found = false;
        while (rs.next()) {
            String sql = rs.getString(1);
            if (sql.indexOf("MEDIAN") >= 0) {
                found = true;
            }
        }
        assertTrue(found);

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        assertCallResult("1", stat, "abs(1)");
        assertCallResult("1", stat, "abs(1)");


        stat.execute("CREATE TABLE TEST(ID INT PRIMARY KEY, NAME VARCHAR)");
        stat.execute("CREATE ALIAS ADD_ROW FOR \"" + getClass().getName() + ".addRow\"");
        ResultSet rs;
        rs = stat.executeQuery("CALL ADD_ROW(1, 'Hello')");
        rs.next();
        assertEquals(1, rs.getInt(1));
        rs = stat.executeQuery("SELECT * FROM TEST");
        rs.next();
        assertEquals(1, rs.getInt(1));
        assertEquals("Hello", rs.getString(2));
        assertFalse(rs.next());


        DatabaseMetaData meta = conn.getMetaData();
        rs = meta.getProcedureColumns(null, null, "ADD_ROW", null);
        assertTrue(rs.next());
        assertEquals("FUNCTIONS", rs.getString("PROCEDURE_CAT"));
        assertEquals("PUBLIC", rs.getString("PROCEDURE_SCHEM"));
        assertEquals("ADD_ROW", rs.getString("PROCEDURE_NAME"));
        assertEquals("P2", rs.getString("COLUMN_NAME"));
        assertEquals(DatabaseMetaData.procedureColumnIn, rs.getInt("COLUMN_TYPE"));
        assertEquals("INTEGER", rs.getString("TYPE_NAME"));
        assertEquals(10, rs.getInt("PRECISION"));
        assertEquals(10, rs.getInt("LENGTH"));
        assertEquals(0, rs.getInt("SCALE"));
        assertEquals(DatabaseMetaData.columnNoNulls, rs.getInt("NULLABLE"));
        assertEquals("", rs.getString("REMARKS"));
        assertEquals(null, rs.getString("COLUMN_DEF"));
        assertEquals(0, rs.getInt("SQL_DATA_TYPE"));
        assertEquals(0, rs.getInt("SQL_DATETIME_SUB"));
        assertEquals(0, rs.getInt("CHAR_OCTET_LENGTH"));
        assertEquals(1, rs.getInt("ORDINAL_POSITION"));
        assertEquals("YES", rs.getString("IS_NULLABLE"));
        assertEquals("ADD_ROW", rs.getString("SPECIFIC_NAME"));
        assertTrue(rs.next());
        assertEquals("P3", rs.getString("COLUMN_NAME"));
        assertEquals("VARCHAR", rs.getString("TYPE_NAME"));
        assertFalse(rs.next());


        stat.executeQuery("CALL ADD_ROW(2, 'World')");


        stat.execute("CREATE ALIAS SELECT_F FOR \"" + getClass().getName() + ".select\"");
        rs = stat.executeQuery("CALL SELECT_F('SELECT * FROM TEST ORDER BY ID')");
        assertEquals(2, rs.getMetaData().getColumnCount());
        rs.next();
        assertEquals(1, rs.getInt(1));
        assertEquals("Hello", rs.getString(2));
        rs.next();
        assertEquals(2, rs.getInt(1));
        assertEquals("World", rs.getString(2));
        assertFalse(rs.next());


        rs = stat.executeQuery("SELECT NAME FROM SELECT_F('SELECT * FROM TEST ORDER BY NAME') ORDER BY NAME DESC");
        assertEquals(1, rs.getMetaData().getColumnCount());
        rs.next();
        assertEquals("World", rs.getString(1));
        rs.next();
        assertEquals("Hello", rs.getString(1));
        assertFalse(rs.next());


        rs = stat.executeQuery("SELECT SELECT_F('SELECT * FROM TEST WHERE ID=' || ID) FROM TEST ORDER BY ID");
        assertEquals(1, rs.getMetaData().getColumnCount());
        rs.next();
        assertEquals("((1, Hello))", rs.getString(1));
        rs.next();
        assertEquals("((2, World))", rs.getString(1));
        assertFalse(rs.next());


        rs = stat.executeQuery("SELECT SELECT_F('SELECT * FROM TEST ORDER BY ID') FROM DUAL");
        assertEquals(1, rs.getMetaData().getColumnCount());
        rs.next();
        assertEquals("((1, Hello), (2, World))", rs.getString(1));
        assertFalse(rs.next());
        assertThrows(ErrorCode.SYNTAX_ERROR_2, stat).
                executeQuery("CALL SELECT_F('ERROR')");
        stat.execute("CREATE ALIAS SIMPLE FOR \"" + getClass().getName() + ".simpleResultSet\"");
        rs = stat.executeQuery("CALL SIMPLE(2, 1, 1, 1, 1, 1, 1, 1)");
        assertEquals(2, rs.getMetaData().getColumnCount());
        rs.next();
        assertEquals(0, rs.getInt(1));
        assertEquals("Hello", rs.getString(2));
        rs.next();
        assertEquals(1, rs.getInt(1));
        assertEquals("World", rs.getString(2));
        assertFalse(rs.next());


        rs = stat.executeQuery("SELECT * FROM SIMPLE(1, 1, 1, 1, 1, 1, 1, 1)");
        assertEquals(2, rs.getMetaData().getColumnCount());
        rs.next();
        assertEquals(0, rs.getInt(1));
        assertEquals("Hello", rs.getString(2));
        assertFalse(rs.next());


        stat.execute("CREATE ALIAS ARRAY FOR \"" + getClass().getName() + ".getArray\"");
        rs = stat.executeQuery("CALL ARRAY()");
        assertEquals(1, rs.getMetaData().getColumnCount());
        rs.next();
        Array a = rs.getArray(1);
        Object[] array = (Object[]) a.getArray();
        assertEquals(2, array.length);
        assertEquals(0, ((Integer) array[0]).intValue());
        assertEquals("Hello", (String) array[1]);
        ResultSet rs2 = a.getResultSet();
        rs2.next();
        assertEquals(1, rs2.getInt(1));
        assertEquals(0, rs2.getInt(2));
        rs2.next();
        assertEquals(2, rs2.getInt(1));
        assertEquals("Hello", rs2.getString(2));
        assertFalse(rs.next());


        stat.execute("CREATE ALIAS ROOT FOR \"" + getClass().getName() + ".root\"");
        rs = stat.executeQuery("CALL ROOT(9)");
        rs.next();

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        deleteDb("functions");
        Connection conn = getConnection("functions");
        Statement stat = conn.createStatement();
        // with white space
        stat.execute("CREATE ALIAS PARSE_INT2 FOR \"java.lang.Integer.parseInt(java.lang.String, int)\"");
        ResultSet rs;
        rs = stat.executeQuery("CALL PARSE_INT2('473', 10)");
        rs.next();
        assertEquals(473, rs.getInt(1));
        stat.execute("DROP ALIAS PARSE_INT2");
        // without white space
        stat.execute("CREATE ALIAS PARSE_INT2 FOR \"java.lang.Integer.parseInt(java.lang.String,int)\"");
        stat.execute("DROP ALIAS PARSE_INT2");
        conn.close();

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    private void testSchemaSearchPath() throws SQLException {
        deleteDb("functions");
        Connection conn = getConnection("functions");
        Statement stat = conn.createStatement();
        ResultSet rs;
        stat.execute("CREATE SCHEMA TEST");
        stat.execute("SET SCHEMA TEST");
        stat.execute("CREATE ALIAS PARSE_INT2 FOR \"java.lang.Integer.parseInt(java.lang.String, int)\";");
        rs = stat.executeQuery("SELECT ALIAS_NAME FROM INFORMATION_SCHEMA.FUNCTION_ALIASES WHERE ALIAS_SCHEMA ='TEST'");
        rs.next();
        assertEquals("PARSE_INT2", rs.getString(1));
        stat.execute("DROP ALIAS PARSE_INT2");


        stat.execute("SET SCHEMA PUBLIC");
        stat.execute("CREATE ALIAS TEST.PARSE_INT2 FOR \"java.lang.Integer.parseInt(java.lang.String, int)\";");
        stat.execute("SET SCHEMA_SEARCH_PATH PUBLIC, TEST");


        rs = stat.executeQuery("CALL PARSE_INT2('-FF', 16)");
        rs.next();
        assertEquals(-255, rs.getInt(1));
        rs = stat.executeQuery("SELECT ALIAS_NAME FROM INFORMATION_SCHEMA.FUNCTION_ALIASES WHERE ALIAS_SCHEMA ='TEST'");
        rs.next();
        assertEquals("PARSE_INT2", rs.getString(1));
        rs = stat.executeQuery("CALL TEST.PARSE_INT2('-2147483648', 10)");
        rs.next();
        assertEquals(-2147483648, rs.getInt(1));
        rs = stat.executeQuery("CALL FUNCTIONS.TEST.PARSE_INT2('-2147483648', 10)");
        rs.next();
        assertEquals(-2147483648, rs.getInt(1));
        conn.close();
    }

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    private void testArrayParameters() throws SQLException {
        deleteDb("functions");
        Connection conn = getConnection("functions");
        Statement stat = conn.createStatement();
        ResultSet rs;
        stat.execute("create alias array_test AS "
                + "$$ Integer[] array_test(Integer[] in_array) "
                + "{ return in_array; } $$;");


        PreparedStatement stmt = conn.prepareStatement("select array_test(?) from dual");
        stmt.setObject(1, new Integer[] { 1, 2 });
        rs = stmt.executeQuery();
        rs.next();
        assertEquals(Integer[].class.getName(), rs.getObject(1).getClass().getName());


        CallableStatement call = conn.prepareCall("{ ? = call array_test(?) }");
        call.setObject(2, new Integer[] { 2, 1 });
        call.registerOutParameter(1, Types.ARRAY);
        call.execute();

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        conn.close();
    }


    private void assertCallResult(String expected, Statement stat, String sql) throws SQLException {
        ResultSet rs = stat.executeQuery("CALL " + sql);
        rs.next();
        String s = rs.getString(1);
        assertEquals(expected, s);
    }

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     * @param name the text
     * @return the count
     */
    public static int addRow(Connection conn, int id, String name) throws SQLException {
        conn.createStatement().execute("INSERT INTO TEST VALUES(" + id + ", '" + name + "')");
        ResultSet rs = conn.createStatement().executeQuery("SELECT COUNT(*) FROM TEST");
        rs.next();
        int result = rs.getInt(1);
        rs.close();
        return result;
    }

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