Question

您好我试图使用基于开始和结束日期的Hibernate来获取表中的行数但是我得到的不是有效月错误

Session session = sessionFactory.getCurrentSession();         
startDate = "13-02-02 00:00:00";
endDate = "17-02-02 00:00:00";
try{
    String hql = "select Count(*) from mytable where PERIOD_START_DATETIME between '" 
                 + startDate + "' AND '" + endDate + "'";
    Query query = session.createQuery(hql);
    long count=(long) query.uniqueResult();

    return count;
} finally{
     session.close();
}

这是我的表格描述

Name                    NULL     TYPE
NAME                    NOT NULL VARCHAR2(255 CHAR)  
PERIOD_END_DATETIME     NOT NULL TIMESTAMP(6)        
PERIOD_START_DATETIME   NOT NULL TIMESTAMP(6)        
PROD_OFFER_TERM_TYPE_ID NOT NULL NUMBER(19)

Answer 1

使用字符串连接生成SQL查询通常是个坏主意，因为

它对性能有害（导致每次执行时重新解析SQL语句）
它容易受到SQL注入攻击

HQL支持绑定变量/预处理语句，因此这应该有效：

String hql = "select Count(*) from mytable where PERIOD_START_DATETIME between :startdate AND :enddate ";
Query query = session.createQuery(hql);
query.setParameter("startdate", startDate);
query.setParameter("enddate", endDate);

（其中startDate和endDate是实际的java.sql.Timestamp值，而不是字符串）。

Answer 2

由于数据库中的开始/结束时间是SQL TIMESTAMP，您可以将Timestamp对象传入查询，如下所示：

Session session = sessionFactory.getCurrentSession();

final DateFormat df = new SimpleDateFormat("yy-MM-dd");

// omitting the time part will set the time to midnight (00:00:00)
Timestamp start = new Timestamp(df.parse("13-02-02").getTime());
Timestamp end = new Timestamp(df.parse("17-02-02").getTime());

try {
    String hql = 
        "select Count(*) from mytable where PERIOD_START_DATETIME between ? AND ?";
    Query query = session.createQuery(hql)
            .setTimestamp(0, start)
            .setTimestamp(1, end);

    long count = (long) query.uniqueResult();

    return count;
} finally {
    session.close();
}

Answer 3

确保您确实在查询中传递了日期值。您可以使用to_date函数指定日期的格式，因为它在字符串中表示。

select Count(*) 
from mytable 
where PERIOD_START_DATETIME between to_date(startDate,'DD-MM-YYYY HH24:MI:SS') AND to_date(endDate,'DD-MM-YYYY HH24:MI:SS');

Answer 4

select Count(*) 
from mytable 
where PERIOD_START_DATETIME between TO_TIMESTAMP(:startDate, 'YY-MM-DD HH24:MI:SS') AND TO_TIMESTAMP(:endDate, 'YY-MM-DD HH24:MI:SS')

在Hibernate中不是有效月份

4 个答案: