Question

我正在对Spring Application进行查询，该查询将基于此查询选择数据库中的数据：

SELECT * FROM
    (
        SELECT a.*, rownum r__
        FROM
        (
            SELECT * FROM SUBSCRIPTIONS WHERE status = 'active' and is_blocked = 'N'
        ) a
        WHERE rownum < ((1 * 3) + 1 )
    )
WHERE r__ >= (((1-1) * pageSize) + 1)

目标是仅对结果进行分页。

当我在数据库查询窗口中执行代码时，得到了预期的结果，但是当直接在Java代码中执行时，通常会出现此错误：

原因：org.springframework.jdbc.BadSqlGrammarException： PreparedStatementCallback;错误的SQL语法[SELECT * FROM（SELECT a。*，rownum r__ FROM（SELECT * FROM SUBSCRIPTIONS WHERE status ='active'和is_blocked ='N'）WHERE rownum < （（？*？）+ 1））在哪里r__> =（（（？-1）*？）+ 1）]];嵌套异常为 java.sql.SQLException：无效的列名

我不明白为什么会返回此错误，因为我的查询在Oracle SQL Client上执行时有效...

要执行我的查询，请执行以下操作：

MapSqlParameterSource params = new MapSqlParameterSource();
        params.addValue("pageSize", paging.getItemsPerPage());
        params.addValue("pageNumber", paging.getPageToFetch());
        SqlQueryLogger.logDebugSqlQuery(selectActiveAndUnblockedSubscriptionPaged, params, log);

        List<Subscription> subscriptions = getNamedParameterJdbcTemplate().query(selectActiveAndUnblockedSubscriptionPaged, params, new SubscriptionRowMapper());
        SubscriptionPagingResult subscriptionPagingResult = new SubscriptionPagingResult();
        subscriptionPagingResult.setResult(subscriptions);

和selectActiveAndUnblockedSubscriptionPaged变量是：

"SELECT * FROM" +
            "(" +
            "    SELECT a.*, rownum r__" +
            "    FROM" +
            "    (" +
            "        SELECT * FROM SUBSCRIPTIONS WHERE status = 'active' and is_blocked = 'N'" +
            "    ) a" +
            "    WHERE rownum < ((:pageNumber * :pageSize) + 1 )" +
            ")" +
            "WHERE r__ >= (((:pageNumber-1) * :pageSize) + 1)";

有人知道为什么此代码不起作用吗？谢谢

Answer 1

只是一个建议，您在（）的thr main之后错过了表别名

SELECT t.* FROM
(
    SELECT a.*, a.rownum r__
    FROM
    (
        SELECT * 
        FROM SUBSCRIPTIONS 
        WHERE status = 'active' 
        and is_blocked = 'N'
    ) a
    WHERE a.rownum < ((1 * 3) + 1 )
) t 
WHERE t.r__ >= (((1-1) * t.pageSize) + 1)

SQL-在DAO中执行时，列名无效

1 个答案: