Question

我在该表中有一个名为eventUserRelationMapping的表，有两个外键Event_id和Ringee_User_id。这个eventUserRelationMapping在UserDO类下没有单独的DO类。在这里我试图让EventUserRelationMapping用于前端使用。如果我得到这个方法，我会得到像这样的错误

Cannot add or update a child row: a foreign key constraint fails (`ringeeapp_dev`.`event_user_relation`, CONSTRAINT `FK_EVT_RINGEE_USER_ID` FOREIGN KEY (`RINGEE_USER_ID`) REFERENCES `ringee_user` (`RINGEE_USER_ID`))

但是插入了该eventUserRelationMApping表中的数据

这是我在DAOImpl中的geteventUserMapping（）方法

Override
    public List<UserDO> getEventUserRelationMapping(UserDO userDO)
            throws UserDataException {
        JdbcTemplate jd = this.getJdbctemplate();
        int isNotDeleted = IRingeeConstants.IS_NOT_DELETED;
      try
      {
          List<UserDO> userDOs = jd.query(GET_EVENT_USER_RELATION_MAPPING, new Object[]  {userDO.getRingeeUserId() , isNotDeleted }, new RowMapper<UserDO>() {
              @Override
                public UserDO mapRow(ResultSet rs, int rowNum) throws SQLException {
                  UserDO userDO = new UserDO();
                  userDO.setEventUserId(rs.getLong(1));
                  userDO.setEventId(rs.getLong(2));
                  userDO.setRingeeUserId(rs.getLong(3));
                  userDO.setAttending(rs.getInt(4));
                  userDO.setDeleted(rs.getInt(5));
                  return userDO;
              }
      });
            return userDOs;
    }catch (DataAccessException dExp) {
        throw new UserDataException("Error while getting eventUserRelationMapping for user " + userDO.getRingeeUserId(), dExp);
    }
}

这是对GET_EVENT_USER_RELATION_MAPPING

的查询

private static final String GET_EVENT_USER_RELATION_MAPPING = "SELECT EVENT_USER_ID, EVENT_ID, RINGEE_USER_ID, IS_ATTENDING, IS_DELETE FROM EVENT_USER_RELATION WHERE RINGEE_USER_ID = ? AND IS_DELETE = ? ";

这是getEventUserRelationMapping的测试用例

@Test
    @Rollback(false)
    public void testgetEventUserRelationMapping() {
        ArrayList<UserDO> userDOs = new ArrayList<>();
        UserDO userDO = getUserDO();
        userDOs.add(userDO);
        UserDO userDO1 = getUserDO1();
        userDOs.add(userDO1);
        EventDO eventDO = getEventDO();
        eventDO.setRingeeUserId(userDO.getRingeeUserId());
        try {
            eventDAOImpl.addEvent(eventDO);
            userDAOImpl.addEventUserRelationMapping(userDOs,
                    eventDO.getEventId());
            List<UserDO> userDOs1 = userDAOImpl
                    .getEventUserRelationMapping(userDO);
            Assert.assertEquals(1, userDOs1);
        } catch (UserDataException uExp) {
            uExp.printStackTrace();
            Assert.fail();
        }

    }

请帮我解决这个问题及其发生的原因

这是事件表的MYSQL查询

CREATE TABLE `event` (
    `EVENT_ID` BIGINT(20) NOT NULL,
    `RINGEE_USER_ID` BIGINT(20) NOT NULL,
    `TEXT` VARCHAR(45) NOT NULL,
    `PLACE` VARCHAR(45) NOT NULL,
    `EVENT_DATE` DATETIME NOT NULL,
    `START_TIME` VARCHAR(10) NULL DEFAULT NULL,
    `END_TIME` VARCHAR(10) NULL DEFAULT NULL,
    `IS_DELETE` TINYINT(1) NULL DEFAULT '0',
    `CREATED_DTTM` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
    `MODIFIED_DTTM` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (`EVENT_ID`),
    INDEX `EVENT_ID` (`EVENT_ID`),
    INDEX `FK_EVENT_RINGEE_USER_ID` (`RINGEE_USER_ID`),
    CONSTRAINT `FK_EVENT_RINGEE_USER_ID` FOREIGN KEY (`RINGEE_USER_ID`) REFERENCES `ringee_user` (`RINGEE_USER_ID`) ON UPDATE NO ACTION ON DELETE NO ACTION
)

这是EVENTUSERRELATION TABLE MYSQL QUERY

CREATE TABLE `event_user_relation` (
    `EVENT_USER_ID` BIGINT(20) NOT NULL DEFAULT '0',
    `EVENT_ID` BIGINT(20) NULL DEFAULT NULL,
    `USER_RELATION_ID` BIGINT(20) NULL DEFAULT NULL,
    `IS_ATTENDING` TINYINT(4) NULL DEFAULT NULL,
    `CREATED_DTTM` TIMESTAMP NULL DEFAULT NULL,
    `MODIFIED_DTTM` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (`EVENT_USER_ID`),
    UNIQUE INDEX `EVENIT_ID_USER_RELATION_ID` (`EVENT_ID`, `USER_RELATION_ID`),
    INDEX `FK_EVT_USR_USR_REL_ID` (`USER_RELATION_ID`),
    CONSTRAINT `FK_EVT_USR_USR_REL_ID` FOREIGN KEY (`USER_RELATION_ID`) REFERENCES `user_relation` (`USER_RELATION_ID`),
    CONSTRAINT `FK_EVT_USR_EVT_ID` FOREIGN KEY (`EVENIT_ID`) REFERENCES `event` (`EVENT_ID`)
)

Answer 1

首先，我在@Test方法中看到错误

Assert.assertEquals（1，userDOs1）; ＆LT; ==＆GT; Assert.assertEquals（1，userDOs1.size（））;

要避免此SQL错误，您需要在表中和连接表中插入数据例如：（tab1，tab2，tab_12）将值插入tab1（提交）将值插入tab2（提交）将值插入tab_12（提交）

如何修复无法添加或更新子行：外键约束失败

1 个答案: