如何在Hibernate中修復命名查詢錯誤（意外令牌：DAY）？

Question

以下是我的命名查詢，用於查找早於90天的活動：

"DELETE FROM PAActivity pa WHERE pa.status IN (:statusSet) AND cast(pa.datoFinish as date) < cast(DATE_SUB(current_date(), INTERVAL (:noofdays) DAY) as date)"

在編譯期間，它會給出以下Hibernate異常：

ERROR 2018-04-24 11:00:07,579 o.h.h.i.a.ErrorCounter - line 1:243: unexpected token: DAY
ERROR 2018-04-24 11:00:07,579 o.h.h.i.a.ErrorCounter - line 1:243: unexpected token: DAY
line 1:243: unexpected token: DAY
    at org.hibernate.hql.internal.antlr.HqlBaseParser.primaryExpression(HqlBaseParser.java:876)
    at org.hibernate.hql.internal.antlr.HqlBaseParser.atom(HqlBaseParser.java:3472)
    at org.hibernate.hql.internal.antlr.HqlBaseParser.unaryExpression(HqlBaseParser.java:3250) .
.
.
.
.
WARN  2018-04-24 11:00:07,641 o.h.h.i.a.HqlParser - HHH000203: processEqualityExpression() : No expression to process!
ERROR 2018-04-24 11:00:08,094 o.h.i.SessionFactoryImpl - HHH000177: Error in named query: deletePAActivityByProcessIDs
org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token: DAY near line 1, column 243 [DELETE FROM fn.gover.model.PAActivity pa WHERE pa.status IN (:statusSet) AND cast(pa.datoFinish as date) < cast(DATE_SUB(current_date(), INTERVAL (:noofdays) DAY) as date)]
    at org.hibernate.hql.internal.ast.QuerySyntaxException.convert(QuerySyntaxException.java:54)
    at org.hibernate.hql.internal.ast.QuerySyntaxException.convert(QuerySyntaxException.java:47)

Answer 1

我認為問題在於HQL不支持INTERVAL

您可以通過兩種方式解決您的問題。 第一-限制條件

Calendar c = Calendar.getInstance();
c.add(Calendar.DAY_OF_YEAR, -90); 
Criteria criteria = session.createCriteria(Yourclass.class);
criteria.add(Restrictions.ge("datoFinish", c.getTime());
List results = criteria.list();

或者只是像這樣更改查詢：

AND cast(pa.datoFinish as date) < cast(:dateMinus90 as date)

並將參數設置為Calendar的結果

.setParameter("dateMinus90", c.getTime())

第二種方法是繼承方言類並注冊sql函數。 例如對於Oracle。

public class MyOracleDialect extends Oracle10gDialect {
    @Override
    protected void registerFunctions() {
        super.registerFunctions();
        registerFunction("sub_days", new SQLFunctionTemplate(StandardBasicTypes.DATE, " date_sub(?1, INTERVAL ?2 DAY)"));
    } }

然后在休眠道具中應使用此方言。 但是我認為這不是最好的方法。