I have a problem with writing criteria in java based on sql code, we must use JSON_TABLE function and search by parameters:
select tab1.id
from TABLE1 tab1
left join
TABLE2 param_json on tab1.id = param_json.TABLE_1_ID,
json_table(
param_json.PARAMS_JSON, '$[*]'
COLUMNS (
"paramCode" VARCHAR2(4000) PATH '$.paramCode',
"displayValue" VARCHAR2(4000) PATH '$.displayValue'
)
) jt
where jt."paramCode" = 'param1' and lower(jt."displayValue") like '%value%');
CriteriaBuilder builder = getEntityManager().getCriteriaBuilder();
CriteriaQuery<Long> query = builder.createQuery(Long.class);
Root<Table1> table1Root = query.from(Table1.class);
Join<Table1, Table2> jsonEJBJoin = table1Root.join(Table1_.table2Elements);
//how add json_table function
List<Predicate> whereConditions = new LinkedList<>();
Predicate[] predicates = new Predicate[whereConditions.size()];
//how add where conditions based on json_table function
query.where(whereConditions.toArray(predicates));
query.select(table1Root.get(Table1_.id));
List<Long> resultList = getEntityManager().createQuery(query)
.setMaxResults(10)
.getResultList();
This is hard because you're using a screwdriver as a hammer. The whole point of the Criteria API is to have platform-independent code which doesn't depend on proprietary functions like json_table
.
If you have database access, I think the cleanest way to resolve this is to create a view to hide all the Oracle-specific code from JPA, eg:
create or replace view VIEW1 (TABLE_1_ID, PARAMCODE, DISPLAYVALUE) as
select param_json.TABLE_1_ID, jt.paramCode, jt.displayValue
from TABLE2 param_json,
json_table(
param_json.PARAMS_JSON, '$[*]'
COLUMNS (
paramCode VARCHAR2(4000) PATH '$.paramCode',
displayValue VARCHAR2(4000) PATH '$.displayValue'
)
) jt;
Then you replace Table2 in your JPA code with View1.
If you can't modify the database, I think you'll have to abandon the Criteria API and use a NativeQuery with bind variable parameters, something like:
List<Long> resultList = getEntityManager().createNativeQuery("select tab1.id
from TABLE1 tab1
left join
TABLE2 param_json on tab1.id = param_json.TABLE_1_ID,
json_table(
param_json.PARAMS_JSON, '$[*]'
COLUMNS (
paramCode VARCHAR2(4000) PATH '$.paramCode',
displayValue VARCHAR2(4000) PATH '$.displayValue'
)
) jt
where jt.paramCode = :param1 and lower(jt.displayValue) like :param2))" )
.setParameter("param1", param1)
.setParameter("param2", "%" + value + "%" )
.setMaxResults(10)
.getResultList();
As a side note, I recommend never using the case-sensitive Oracle identifiers (with double quotes). Some Oracle tutorials use them, but they only make things more complicated.
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