[英]Search by the combination of multiple parameters via Native Query
我目前正在研究一種功能,它將允許系統通過6個參數的組合來搜索公共服務收據,這些參數可以為null,這意味着不應使用以下參數過濾收據:accountNumber,amountRangeMin,amountRangeMax,dateRangeMin,dateRangeMax, publicServiceId。 但是,為每個參數組合制作方法都不是一種選擇,我認為必須有更好的方法,一開始我的方法如下:
在我的服務上,我有以下方法:
public Map<String,Object> findPublicServiceReceiptsByParams(Integer accountNumber, BigDecimal amountRangeMin,
BigDecimal amountRangeMax, LocalDate dateRangeMin, LocalDate dateRangeMax, Integer publicServiceId) {
Map<String,Object> publicServiceReceipts = new HashMap<String,Object>();
String accountNumberFilter = !(accountNumber==null) ? accountNumber.toString() : "AccountNumberTableName";
String amountRangeMinFilter = !(amountRangeMin==null) ? amountRangeMin.toString() : "table.AmountColumnName";
String amountRangeMaxFilter = !(amountRangeMax==null) ? amountRangeMax.toString() : "table.AmountColumnName";
String dateRangeMinFilter = !(dateRangeMin==null) ? dateRangeMin.toString() : "Table.ReceiptCreationDateColumn";
String dateRangeMaxFilter = !(dateRangeMax==null) ? dateRangeMax.toString() : "Table.ReceiptCreationDateColumn";
String publicServiceIdFilter = !(publicServiceId==null) ? publicServiceId.toString() : "table.publicServiceIdColumn";
publicServiceReceipts = publicServiceReceiptRepository.findPublicServiceReceiptsByParams(accountNumberFilter,
amountRangeMinFilter, amountRangeMaxFilter, dateRangeMinFilter, dateRangeMaxFilter,
publicServiceIdFilter);
return publicServiceReceipts;
}
然后在我的存儲庫中,我有:
final static String FIND_PUBLIC_SERVICES_BY_ARGS = "Select (Insert whatever logic should go in here to select columns from receipts the where clause is the one that matters)"
+ " WHERE ACT.ACT_AccountNumber=:accountNumberFilter\n"
+ " AND PSE.PSE_Id=:publicServiceIdFilter\n"
+ " AND PSR.PSR_CreateDate BETWEEN :dateRangeMinFilter AND :dateRangeMaxFilter\n"
+ " AND PSR.PSR_Amount BETWEEN :amountRangeMinFilter AND :amountRangeMaxFilter\n"
+ " order by PSR.PSR_CreateDate desc";
@Query(nativeQuery = true, value = FIND_PUBLIC_SERVICES_BY_ARGS)
Map<String, Object> findPublicServiceReceiptsByParams(@Param("accountNumberFilter") String accountNumberFilter,
@Param("amountRangeMinFilter") String amountRangeMinFilter,
@Param("amountRangeMaxFilter") String amountRangeMaxFilter,
@Param("dateRangeMinFilter") String dateRangeMinFilter,
@Param("dateRangeMaxFilter") String dateRangeMaxFilter,
@Param("publicServiceIdFilter") String publicServiceIdFilter);
}
我的理由是,如果參數為null,則意味着使用Web Service的人對該參數都不感興趣,因此,如果發生這種情況,我將該變量設置為Column Name,以使其在WHERE子句中不受影響,並且從理論上講使它生效比較簡單,但是我發現它會以字符串形式發送名稱,因此不會被視為sql語句,這是我的思想上的缺陷,正如我所說,除了為每種組合編寫每種方法外,還必須有其他方法,感謝您的幫助:)。
您應該使用Criteria API ,該API是為創建動態查詢而設計的。 在這種情況下,並不一定要使用命名查詢。 有了它,您可以執行以下操作:
@PersistenceContext
EntityManager em;
List<YourEntity> method(String argument) {
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<YourEntity> cq = cb.createQuery(YourEntity.class);
Root<YourEntity> root = cq.from(YourEntity.class);
List<Predicate> predicates = new ArrayList<>();
if (argument == null) {
predicates.add(cb.equal(root.get("yourAttribute"), argument);
}
// rest of your logic goes here
cq.where(predicates.toArray(new Predicate[]{}));
return em.createQuery(cq).getResultList();
}
我找到了一種解決此問題的方法,我這樣做是這樣的(我將僅顯示本機Query,因為這是我所更改的內容):
DECLARE @actNum varchar(50),@crdNum varchar(50),@pseId varchar(50),@dateMin varchar(50),@dateMax varchar(50),@amountMin varchar(50),@amountMax varchar(50)
SET @actNum = :actNum
SET @crdNum = :crdNum
SET @pseId = :pseId
SET @dateMin = :dateMin
SET @dateMax = :dateMax
SET @amountMin = :amountMin
SET @amountMax = :amountMax
--Whatever Select with joins statement
WHERE ACT.ACT_AccountNumber = CASE WHEN @actNum = 'N/A'
THEN ACT.ACT_AccountNumber
ELSE @actNum END
AND CRD_CardNumber = CASE WHEN @crdNum = 'N/A'
THEN CRD_CardNumber
ELSE @crdNum END
AND PSE.PSE_Id= CASE WHEN @pseId = 'N/A'
THEN PSE.PSE_Id
ELSE @pseId END
AND PSR.PSR_CreateDate >= CASE WHEN @dateMin = 'N/A'
THEN PSR.PSR_CreateDate
ELSE @dateMin END
AND PSR.PSR_CreateDate <= CASE WHEN @dateMax = 'N/A'
THEN PSR.PSR_CreateDate
ELSE @dateMax END
AND PSR.PSR_Amount BETWEEN CASE WHEN @amountMin = 'N/A'
THEN PSR.PSR_Amount
ELSE @amountMin END
AND CASE WHEN @amountMax = 'N/A'
THEN PSR.PSR_Amount
ELSE @amountMax END
ORDER BY PSR.PSR_CreateDate DESC
后端會將參數發送為“ N / A”(如果不應該用於過濾數據)或實際值,這對我來說很好!
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