Micronaut 数据的计数查询示例 @Query

Question

有人可以举例说明 countQuery 在使用 Micronaut 数据进行显式查询 (@Query) 时实现分页吗？ https://micronaut-projects.github.io/micronaut-data/latest/guide/#explicitQueries

处没有示例

我必须进行如下查询

@Query("From UserRelation where userId = :userId and itemId=:itemId", countQuery = <count query here>)

Answer 1

你可以这样做：

@Query(
  value = "select relation_ from UserRelation relation_ where relation_.userId = :userId and relation_.itemId = :itemId", 
  countQuery = "select count(relation_) from UserRelation relation_ where relation_.userId = :userId and relation_.itemId = :itemId"
)

计数查询将相同，只需更改一处，即SELECT子句中的count()函数。