Java FilteredRowSet.acceptChanges方法代码示例

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

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

    /*
     * Update the third row. Filter has no effect here.
     */
    assertTrue(filteredRowSet.last());
    assertEquals("test4", filteredRowSet.getString(2));
    filteredRowSet.updateString(2, "update4");
    filteredRowSet.updateRow();
    assertEquals("update4", filteredRowSet.getString(2));
    // the updated row becomes not visible through filter
    assertTrue(filteredRowSet.last());
    assertEquals("test3", filteredRowSet.getString(2));

    // commit to database
    filteredRowSet.acceptChanges(conn);
    rs = st
            .executeQuery("SELECT COUNT(*) FROM USER_INFO WHERE NAME = 'update4'");
    assertTrue(rs.next());
    assertEquals(0, rs.getInt(1));

    /*
     * Remove filter
     */
    filteredRowSet.setFilter(null);
    assertTrue(filteredRowSet.last());
    assertEquals("update4", filteredRowSet.getString(2));
    /*
     * The forth row isn't updated to database, and it lost it's status
     * after acceptChanges().
     */
    assertFalse(filteredRowSet.rowUpdated());
}
 

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

    /*
     * Mark the first row as delete.
     */
    assertTrue(filteredRowSet.first());
    assertEquals(1, filteredRowSet.getInt(1));
    filteredRowSet.deleteRow();

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

    assertTrue(filteredRowSet.first());
    assertEquals(2, filteredRowSet.getInt(1));

    filteredRowSet.acceptChanges(conn);
    rs = st.executeQuery("SELECT COUNT(*) FROM USER_INFO WHERE ID = 1");
    assertTrue(rs.next());
    assertEquals(1, rs.getInt(1));

    /*
     * Remove filter
     */
    filteredRowSet.setFilter(null);
    filteredRowSet.acceptChanges(conn);
    rs = st.executeQuery("SELECT COUNT(*) FROM USER_INFO WHERE ID = 1");
    assertTrue(rs.next());
    assertEquals(1, rs.getInt(1));
    /*
     * The first row has been deleted from FilteredRowSet. However, it isn't
     * deleted from database.
     */
    filteredRowSet.setShowDeleted(true);
    assertTrue(filteredRowSet.first());
    assertEquals(2, filteredRowSet.getInt(1));
}
 

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);
}