比较Java中的两个日期，一个来自MySQL

我需要比较Java中的两个日期，但从数据库中获取的日期与插入的日期值不同

@Test
public void testCompareHoraHardcore() {
    String sql = "update solicitacao_viagem set "
            + "hora_retorno=?, id_veiculo=?, id_responsavel_solicitacao=?, "
            + "id_responsavel_autorizante=? where id_solicitacao_viagem=? ";
    Timestamp timestamp1 = new Timestamp(System.currentTimeMillis());
    try {
        PreparedStatement stmt = connection.prepareStatement(sql);
        stmt.setTimestamp(1, timestamp1);
        stmt.setInt(2, 90);
        stmt.setInt(3, 337);
        stmt.setInt(4, 337);
        stmt.setInt(5, 91);
        stmt.executeUpdate();
        stmt.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    Timestamp timestamp2 = null;
    try {
        sql = "select * from solicitacao_viagem where id_solicitacao_viagem=?";
        PreparedStatement stmt = connection.prepareStatement(sql);
        stmt.setInt(1, 91);
        stmt.executeQuery();
        ResultSet rs = stmt.executeQuery();
        rs.next();
        timestamp2 = rs.getTimestamp("hora_retorno");
        stmt.close();
    } catch (SQLException e) {
        e.printStackTrace();
    }

    assertEquals(timestamp1.getTime(), timestamp2.getTime());
}

此测试返回：

Testcase: testCompareHoraHardcore(com.model.dao.SolicitacaoViagemDAOTest):  FAILED
expected:<1360553289573> but was:<1360553289000>
junit.framework.AssertionFailedError: expected:<1360553289573> but was:<1360553289000>
at com.model.dao.SolicitacaoViagemDAOTest.testCompareHoraHardcore(SolicitacaoViagemDAOTest.java:349)

Testcase:TestCompareHolaHardcore（com.model.dao.requestacaoviagedaotest）：失败
预期：但是：
junit.framework.AssertionFailedError:应为：但为：
在com.model.dao.requestacoaviemagedaotest.testCompareHoraHardcore上（requestacoaviemagedaotest.java:349）

为什么MySQL要削减最后三个数字

我使用的是MySQL 5.5.22和Java（TM）SE运行时环境（build 1.7.0_11-b21）

“hora_Retrono”列是时间戳

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提前感谢。

根据这一点，MySQL不在时间戳列（或其他日期时间类型）中存储小数秒

MySql将

DATETIME

和

TIMESTAMP

存储到seconds精度。这里有一段引用自

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您必须检查文档，但可能是MySQL以秒为单位存储时间戳，而不是以毫秒为单位…？Thank=d。但我如何存储数据库中的e retrive DateTime值以在Java中进行比较？使用Java Date或将列更改为DATETIME，或两个？您可以将毫秒值四舍五入到最接近的千。

A DATETIME or TIMESTAMP value can include a trailing fractional seconds
part in up to microseconds(6 digits) precision. 

Although this fractional part is recognized, 
it is discarded from values stored into DATETIME or TIMESTAMP columns