Java FilteredRowSet.next方法代码示例

import javax.sql.rowset.FilteredRowSet; //导入方法依赖的package包/类
public void testSetFilter() throws Exception {
    FilteredRowSet filteredRowSet = newFilterRowSet();
    rs = st.executeQuery("SELECT * FROM USER_INFO");
    filteredRowSet.populate(rs);

    /*
     * Set Filter: RangeOne
     */
    Predicate range = new RangeOne();
    filteredRowSet.setFilter(range);
    filteredRowSet.beforeFirst();
    int index = 0;
    while (filteredRowSet.next()) {
        index++;
        assertTrue(filteredRowSet.getString(2).indexOf("test") != -1);
    }
    assertEquals(3, index);
    assertSame(range, filteredRowSet.getFilter());

    /*
     * Set another Filter: RangeTwo
     */
    range = new RangeTwo();
    filteredRowSet.setFilter(range);
    filteredRowSet.beforeFirst();
    index = 0;
    boolean isSecondRowFiltered = true;
    while (filteredRowSet.next()) {
        index++;
        if ("test2".equals(filteredRowSet.getString(2))) {
            isSecondRowFiltered = false;
        }
    }
    assertEquals(3, index);
    assertTrue(isSecondRowFiltered);
    assertSame(range, filteredRowSet.getFilter());

    /*
     * Remove Filter
     */
    filteredRowSet.setFilter(null);
    filteredRowSet.beforeFirst();
    index = 0;
    while (filteredRowSet.next()) {
        index++;
        assertEquals(index, filteredRowSet.getInt(1));
    }
    assertEquals(4, index);
    assertNull(filteredRowSet.getFilter());
}
 

import javax.sql.rowset.FilteredRowSet; //导入方法依赖的package包/类
public void testSetFilterOnFilteredRow() throws Exception {
    FilteredRowSet filteredRowSet = newFilterRowSet();
    rs = st.executeQuery("SELECT * FROM USER_INFO");
    filteredRowSet.populate(rs);

    filteredRowSet.next();
    assertEquals(1, filteredRowSet.getRow());
    Predicate range = new RangeOne();
    filteredRowSet.setFilter(range);

    // not filtered
    assertEquals(1, filteredRowSet.getRow());
    assertEquals("hermit", filteredRowSet.getString(2));

    filteredRowSet.updateString(2, "update");
    assertEquals("update", filteredRowSet.getString(2));

    filteredRowSet.next();
    assertEquals(2, filteredRowSet.getRow());
    assertEquals("test", filteredRowSet.getString(2));

    filteredRowSet.previous();
    assertTrue(filteredRowSet.isBeforeFirst());

    try {
        filteredRowSet.getString(2);
        fail("should should SQLException");
    } catch (SQLException e) {
        // expected, Not a valid cursor
    }

    filteredRowSet.setFilter(null);

    assertTrue(filteredRowSet.isBeforeFirst());

    assertTrue(filteredRowSet.next());
    assertEquals("update", filteredRowSet.getString(2));

    filteredRowSet.setFilter(range);
    assertEquals("update", filteredRowSet.getString(2));
    filteredRowSet.updateString(2, "testUpdate");

    filteredRowSet.next();
    assertEquals(2, filteredRowSet.getRow());
    assertEquals("test", filteredRowSet.getString(2));

    filteredRowSet.previous();
    assertEquals(1, filteredRowSet.getRow());
    assertEquals("testUpdate", filteredRowSet.getString(2));

}
 

import javax.sql.rowset.FilteredRowSet; //导入方法依赖的package包/类
public void testFilter_Insert() throws Exception {
    FilteredRowSet filteredRowSet = newFilterRowSet();
    rs = st.executeQuery("SELECT * FROM USER_INFO");
    filteredRowSet.populate(rs);

    Predicate range = new RangeOne();
    filteredRowSet.setFilter(range);

    /*
     * Insert a row. when call updateXXX(), evaluate(Object value, int
     * column) is called to check first.
     */
    filteredRowSet.afterLast();
    filteredRowSet.moveToInsertRow();
    filteredRowSet.updateInt(1, 200);
    try {
        filteredRowSet.updateString("NAME", "test200");
        fail("should throw SQLException");
    } catch (SQLException e) {
        filteredRowSet.updateString("NAME", "insert200");
    }
    filteredRowSet.insertRow();
    filteredRowSet.moveToCurrentRow();

    /*
     * Although the new row is inserted, it is invalid through
     * evaluate(RowSet rs). Therefore, the inserted row is not visible.
     */
    filteredRowSet.beforeFirst();
    int index = 0;
    while (filteredRowSet.next()) {
        index++;
        assertEquals(index + 1, filteredRowSet.getInt(1));
    }
    assertEquals(3, index);

    /*
     * Remove filter. See the inserted row. Then set again, and commit to
     * database.
     */
    filteredRowSet.setFilter(null);
    assertTrue(filteredRowSet.last());
    assertEquals(200, filteredRowSet.getInt(1));
    assertTrue(filteredRowSet.rowInserted());
    filteredRowSet.setFilter(range);
    filteredRowSet.acceptChanges(conn);
    // check database: the inserted row isn't commited to database
    rs = st.executeQuery("SELECT * FROM USER_INFO");
    index = 0;
    while (rs.next()) {
        index++;
        assertEquals(index, rs.getInt(1));
    }
    assertEquals(4, index);

    /*
     * Remove filter
     */
    filteredRowSet.setFilter(null);
    filteredRowSet.beforeFirst();
    index = 0;
    while (filteredRowSet.next()) {
        index++;
        if (index == 5) {
            /*
             * Though the new row isn't inserted into database, the inserted
             * row lost it's status after acceptChanges().
             */
            assertEquals(200, filteredRowSet.getInt(1));
            assertFalse(filteredRowSet.rowInserted());
        } else {
            assertEquals(index, filteredRowSet.getInt(1));
        }
    }
    assertEquals(5, index);
}
 

import javax.sql.rowset.FilteredRowSet; //导入方法依赖的package包/类
public void testPaging() throws Exception {
    insertMoreData(4);

    FilteredRowSet filteredRowSet = newFilterRowSet();

    filteredRowSet.setCommand("select * from USER_INFO");
    filteredRowSet.setUrl(DERBY_URL);

    filteredRowSet.setPageSize(3);
    filteredRowSet.execute();

    Predicate filter = new OddRowFilter();

    filteredRowSet.setFilter(filter);

    assertEquals("select * from USER_INFO", filteredRowSet.getCommand());

    assertFalse(filteredRowSet.previousPage());

    assertTrue(filteredRowSet.next());
    assertEquals(1, filteredRowSet.getInt(1));

    assertTrue(filteredRowSet.next());
    assertEquals(3, filteredRowSet.getInt(1));

    assertFalse(filteredRowSet.next());
    assertTrue(filteredRowSet.isAfterLast());

    if (!"true".equals(System.getProperty("Testing Harmony"))) {
        // RI need nextPage one more time
        assertTrue(filteredRowSet.nextPage());
    }

    int index = 5;
    while (filteredRowSet.nextPage()) {
        while (filteredRowSet.next()) {
            assertEquals(index, filteredRowSet.getInt(1));
            index += 2;
        }
    }

    assertEquals(9, index);

    filteredRowSet = newFilterRowSet();
    filteredRowSet.setCommand("select * from USER_INFO");
    filteredRowSet.setUrl(DERBY_URL);

    filteredRowSet.setPageSize(3);
    filteredRowSet.execute();

    filteredRowSet.setFilter(filter);

    assertTrue(filteredRowSet.next());
    assertEquals(1, filteredRowSet.getInt(1));

    assertTrue(filteredRowSet.nextPage());
    if (!"true".equals(System.getProperty("Testing Harmony"))) {
        // RI need nextPage one more time
        assertTrue(filteredRowSet.nextPage());
    }

    assertTrue(filteredRowSet.next());

    assertEquals(5, filteredRowSet.getInt(1));

    assertTrue(filteredRowSet.nextPage());

    assertTrue(filteredRowSet.next());
    assertEquals(7, filteredRowSet.getInt(1));

    assertFalse(filteredRowSet.nextPage());

}