如何使用java避免Mysql数据库中的“数据因列被截断”？

在我的 Java 程序中..Hibernate Bean 类定义一列，例如..

TimtableVO.java

@Column(name="REPEAT_DAYS")
private WeekdayType repeatDays;//hear WeekdayType is Enum Class

在我的服务类中，我使用这个 TimetableVO.java bean 类作为..

这是我的服务类：

public void createEvent(TimetableVO timetableVO) {
    WeekdayType weekday = null;
    for (String day : timetableVO.getTemp().split(",")) {
        weekday = WeekdayType.valueOf(day);
    }
    timetableVO.setRepeatDays(weekday);
    userDAO.createEvent(timetableVO);
}

我的 DAO 类正在插入 timetableVO 对象..

public void createEvent(TimetableVO timetableVO) throws DataAccessException {
    entityManager.persist(timetableVO);
}

但例外总会到来..

Exception: Caused by: java.sql.BatchUpdateException: Data truncated for column 'REPEAT_DAYS' at row 1
    at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2045)
    at coHibernate: insert into EC_TIMETABLE (CLASS_DURATION, COURSE_DURATION, COURSE_FEE, END_DATE, REPEAT_COUNT, REPEAT_DAYS, REPEAT_TYPE, SEARCH_KEY, START_DATE, S_ID) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
m.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1468)
    at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
    ... 65 more
Caused by: java.sql.SQLException: Data truncated for column 'REPEAT_DAYS' at row 1
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)

EDIT:这是我的 WeekdayType 枚举

public enum WeekdayType {
    MONDAY(Calendar.MONDAY), TUESDAY(Calendar.TUESDAY), WEDNESDAY(
    Calendar.WEDNESDAY), THURSDAY(Calendar.THURSDAY), FRIDAY(
    Calendar.FRIDAY), SATURDAY(Calendar.SATURDAY), SUNDAY(
    Calendar.SUNDAY);

    private int day;

    private WeekdayType(int day) {
        this.day = day;
    }

    public int getDay() {
        return day;
    }
}

这可能是由以下原因引起的ENUM在您的表架构中，没有您尝试插入的所有值。就像是：

CREATE TABLE IF NOT EXISTS event (
    weekday_type ENUM(
        'SUNDAY',
        'MONDAY',
        'TUESDAY',
        'WEDNESDAY',
        'THURSDAY',
        'FRIDAY'
    ) NOT NULL
);

然后当你执行像这样的插入时

INSERT INTO event (weekday_type) VALUES ('SATURDAY');

使用 JDBC 你会得到一个异常，例如：Data truncated for column 'weekday_type' at row 1因为你忘记包括SATURDAY在你的表定义中。当插入发生时，该值得到truncated什么也没有。