QueryDSL JPA功能

Question

我用querydsl-JPA和querydsl-SQL 4.1.4

想要運行簡單的SQL

/* Formatted on 04/08/2017 9:46:39 (QP5 v5.300) */ 
SELECT created 
    FROM user_info 
WHERE TRUNC (created) <= TO_DATE ('01.01.2016', 'dd.mm.yyyy') 

我的方法比較日期

protected BooleanExpression dateCompare(DateTimePath<java.util.Date> dateTimePath, Date date) { 
    DateExpression<Date> dbDate = SQLExpressions.datetrunc(DatePart.day, Expressions.asDate(dateTimePath)); 
    DateExpression<Date> compareDate = Expressions. asDate(date); 
    return dbDate.eq(compareDate); 
} 

但我有錯誤

Caused by: java.lang.IllegalArgumentException: An exception occurred while creating a query in EntityManager: 
Exception Description: Syntax error parsing [select transferLog 
from TransferLog transferLog 
where trunc_day(transferLog.transaction) = ?1]. 
[54, 93] The expression is not a valid conditional expression. 
    at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1616) 

如何正確在QueryDSL中使用TRUNC和TO_DATE？

例如在JPA我用這樣的代碼

if (transferFilter.getTransactionEnd() != null) { 
      Expression<Date> transactionEnd = qb.function("TRUNC", Date.class, root.get(TransferLog_.transaction)); 
      Expression<Date> tillDate = qb.function("TO_DATE", Date.class, qb.literal(DateUtils.formatRuDate(transferFilter.getTransactionEnd(), "")), qb.literal("dd.mm.yyyy")); 
      predicates.add(qb.greaterThanOrEqualTo(transactionEnd, tillDate)); 
      } 

我嘗試使用這種

protected BooleanExpression dateCompare(DateTimePath<java.util.Date> dateTimePath, Date date) { 
    DateExpression<Date> dbDate = Expressions.dateTemplate(Date.class, "TRUNC({0})", dateTimePath); 
    DateExpression<Date> compareDate = Expressions.dateTemplate(Date.class, "TO_DATE({0}, {1})", DateUtils.formatRuDate(date), ORACLE_DATE_FORMAT); 
    // DateExpression<Date> dbDate = SQLExpressions.datetrunc(DatePart.day, Expressions.asDate(dateTimePath)); 
    // DateExpression<Date> compareDate = Expressions. asDate(date); 
    return dbDate.eq(compareDate); 
} 

但有錯誤

Caused by: Exception [EclipseLink-0] (Eclipse Persistence Services - 2.6.4.v20160829-44060b6): org.eclipse.persistence.exceptions.JPQLException 
Exception Description: Syntax error parsing [select transferLog 
from TransferLog transferLog 
where TRUNC(transferLog.transaction) = TO_DATE(?1, ?2)]. 
[54, 102] The expression is not a valid conditional expression. 
    at org.eclipse.persistence.internal.jpa.jpql.HermesParser.buildException(HermesParser.java:155) 
    at org.eclipse.persistence.internal.jpa.jpql.HermesParser.validate(HermesParser.java:334) 
    at org.eclipse.persistence.internal.jpa.jpql.HermesParser.populateQueryImp(HermesParser.java:278) 
    at org.eclipse.persistence.internal.jpa.jpql.HermesParser.buildQuery(HermesParser.java:163) 
    at org.eclipse.persistence.internal.jpa.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:142) 
    at org.eclipse.persistence.internal.jpa.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:116) 
    at org.eclipse.persistence.internal.jpa.EJBQueryImpl.<init>(EJBQueryImpl.java:102) 
    at org.eclipse.persistence.internal.jpa.EJBQueryImpl.<init>(EJBQueryImpl.java:86) 
    at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1614) 
    ... 219 more 

Answer 1

我決定這個所以...

protected enum TypeCompare { 
           EQ, 
           GT, 
           GOE, 
           LT, 
           LOE 
    } 
    private final static String ORACLE_DATE_FORMAT = "dd.mm.yyyy"; 

...

protected BooleanExpression dateCompare(DateTimePath<java.util.Date> dateTimePath, Date date, TypeCompare typeCompare) { 
     StringTemplate dbDate = Expressions.stringTemplate("function('TRUNC', {0})", dateTimePath); 
     StringTemplate compareDate = Expressions.stringTemplate("function('TO_DATE', {0}, {1})", DateUtils.formatRuDate(date), ORACLE_DATE_FORMAT); 
     switch (typeCompare) { 
      case EQ: 
       return dbDate.eq(compareDate); 
      case GT: 
       return dbDate.gt(compareDate); 
      case GOE: 
       return dbDate.goe(compareDate); 
      case LT: 
       return dbDate.lt(compareDate); 
      case LOE: 
       return dbDate.loe(compareDate); 
      default: 
       return dbDate.eq(compareDate); 
     } 
    }