[英]Spring Data JPA - repository returns different type
我有一个像这样的CrudRepository
:
public interface TestTableRepository extends CrudRepository<TestTable, Long> {
@Query(
value = "select count(case when field1 = true then 1 end) as field1Count, count(case when field2 = true then 1 end) as field2Count from test_table",
nativeQuery = true
)
List<Integer> selectRowCount();
}
这是我的应用程序中类似查询的简化版本。 什么是最好的返回类型?
正如目前所写,实际返回的类型是List<Object[]>
而不是List<Integer>
。 这怎么可能? 我猜这与 Spring/Hibernate 在运行时构建的查询实现有关。
**The best return type in this case is `Map<String, Object>`.<br/>
To retrieve data from Map you can used alias name. In this case, key field1Count and field2Count will give you count value.**
For Example
@RestController class :
@GetMapping("/getCount")
public String getCounnt() {
Map<String, Object> mp = userRepo.getCount();
int field1CountValue = Integer.parseInt(mp.get("field1Count").toString());
int field2CountValue = Integer.parseInt(mp.get("field2Count").toString());
System.out.println("field1CountValue :"+field1CountValue+" field2CountValue :"+field2CountValue);
return "field1CountValue :"+field1CountValue+" field2CountValue :"+field2CountValue;
}
___________________________________
@Repository Interface
import java.util.Map;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;
public interface UserRepo extends CrudRepository<User, Long>{
@Query(
value = "select count(case when id > 0 then 1 end) as field1Count, "
+ "count(case when id > 15 then 1 end) as field2Count from user",
nativeQuery = true
)
Map<String, Object> getCount();
}
Console :
[Hibernate: select count(case when id > 0 then 1 end) as field1Count, count(case when id > 15 then 1 end) as field2Count from user
field1CountValue :9 field2CountValue :0]
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