Question

我有一个包含id和date列的表。 目前，每个具有不同日期的ID有10条记录。我想为每个ID 获取最新的3条记录。当我在命令行上运行查询时，它按预期工作并返回正好3条记录。但是当我使用 Spring JDBC Template运行相同的查询时，它会返回每个id 的所有10条记录。我的查询如下： -

SELECT
  `ranked`.`ID`,
  `ranked`.`DATE`
FROM
  (SELECT
    `stk`.`id` AS ID,
    `stk`.`date` AS DATE,
    @id_rank := IF(@current_id = `stk`.`id`,@id_rank + 1,1) AS id_rank,
    @current_id := `stk`.`id`
  FROM
    stack stk
  ORDER BY `stk`.`id` ASC,
    `stk`.`date` DESC) ranked
WHERE ranked.id_rank <= 3

我的Java代码是这样的： -

public static final String ID_FILTER_QUERY = "SELECT `ranked`.`ID`, `ranked`.`DATE` FROM "
            + "(SELECT `stk`.`id` AS ID, `stk`.`date` AS DATE, @id_rank := IF(@current_id = `stk`.`id`,@id_rank + 1,1) AS id_rank,"
            + "@current_id := `stk`.`id` FROM stack stk ORDER BY `stk`.`id` ASC, `stk`.`date` DESC) ranked WHERE ranked.id_rank <= 3";

public List<StackDTO> getStackGroupById() {

    return jdbcTemplate.query(Queries.ID_FILTER_QUERY, new IdMapper());
}

是否有其他方法可以获取每个ID或每组的最后3条记录？

Spring Jdbc模板在查询中带有变量的意外行为

0 个答案: