Question

我在Oracle中创建了一个视图，它打算在表中加载部分数据，并受应用程序上下文中设置的参数限制：

CREATE OR REPLACE VIEW VW_SALT_RAW_SUMMARY AS
(
    select
        VENDOR_ID, PRD_CATEGORY, LOGIN_NAME, CURRENCY /*, Some more aggregated fields*/
    from
        VENDOR_RECORD
    where
        (
            order_time between SYS_CONTEXT('CTX_ALERT', 'rptBeginTime') and SYS_CONTEXT('CTX_ALERT', 'rptEndTime')
            AND order_time between SYS_CONTEXT('CTX_ALERT', 'RESTRICT_BEGIN_TIME') AND SYS_CONTEXT('CTX_ALERT', 'RESTRICT_END_TIME')
        )
        and
        (
            (
                SYS_CONTEXT('CTX_ALERT', 'rptVENDOR_ID') = '*'
                or
                (
                    VENDOR_ID in
                    (
                        select
                            regexp_substr(SYS_CONTEXT('CTX_ALERT', 'rptVENDOR_ID'), '[^, ]+',1, rownum) str
                        from
                            dual connect by level <= regexp_count (SYS_CONTEXT('CTX_ALERT', 'rptVENDOR_ID'), '[^, ]+')
                    )
                )
            )
            AND
            (
                SYS_CONTEXT('CTX_ALERT', 'RESTRICT_VENDOR_ID') = '*'
                or
                (
                    VENDOR_ID in
                    (
                        select
                            regexp_substr(SYS_CONTEXT('CTX_ALERT', 'RESTRICT_VENDOR_ID'), '[^, ]+',1, rownum) str
                        from
                            dual connect by level <= regexp_count (SYS_CONTEXT('CTX_ALERT', 'RESTRICT_VENDOR_ID'), '[^, ]+')
                    )
                )
            )
        )
        and
        (
            (
                SYS_CONTEXT('CTX_ALERT', 'rptPRD_CATEGORY') = '*'
                or
                (
                    PRD_CATEGORY in
                    (
                        select
                            regexp_substr(SYS_CONTEXT('CTX_ALERT', 'rptPRD_CATEGORY'), '[^, ]+',1, rownum) str
                        from
                            dual connect by level <= regexp_count (SYS_CONTEXT('CTX_ALERT', 'rptPRD_CATEGORY'), '[^, ]+')
                    )
                )
            )
            AND
            (
                SYS_CONTEXT('CTX_ALERT', 'RESTRICT_PRD_CATEGORY') = '*'
                or
                (
                    PRD_CATEGORY in
                    (
                        select
                            regexp_substr(SYS_CONTEXT('CTX_ALERT', 'RESTRICT_PRD_CATEGORY'), '[^, ]+',1, rownum) str
                        from
                            dual connect by level <= regexp_count (SYS_CONTEXT('CTX_ALERT', 'RESTRICT_PRD_CATEGORY'), '[^, ]+')
                    )
                )
            )
        )
        and
        (
            (
                SYS_CONTEXT('CTX_ALERT', 'rptLOGIN_NAME') = '*'
                or
                (
                    LOGIN_NAME in
                    (
                        select
                            regexp_substr(SYS_CONTEXT('CTX_ALERT', 'rptLOGIN_NAME'), '[^, ]+',1, rownum) str
                        from
                            dual connect by level <= regexp_count (SYS_CONTEXT('CTX_ALERT', 'rptLOGIN_NAME'), '[^, ]+')
                    )
                )
            )
            AND
            (
                SYS_CONTEXT('CTX_ALERT', 'RESTRICT_PRD_CATEGORY') = '*'
                or
                (
                    LOGIN_NAME in
                    (
                        select
                            regexp_substr(SYS_CONTEXT('CTX_ALERT', 'RESTRICT_PRD_CATEGORY'), '[^, ]+',1, rownum) str
                        from
                            dual connect by level <= regexp_count (SYS_CONTEXT('CTX_ALERT', 'RESTRICT_PRD_CATEGORY'), '[^, ]+')
                    )
                )
            )
        )
    group by
        VENDOR_ID, PRD_CATEGORY, LOGIN_NAME, CURRENCY
);

但是，尽管我在应用程序上下文中正确设置了参数，但查询始终不返回任何结果。我尝试了没有group by和聚合字段的相同查询，然后我可以获取数据（当然没有任何分组）。

如果我想通过＆＃34;来获得＆＃34;数据属性，我必须添加虚拟语句＆＃34; rownum＆gt; = 0＆＃34; hack是where子句中的最后一个语句，即：

CREATE OR REPLACE VIEW VW_SALT_RAW_SUMMARY AS
(
    select
        VENDOR_ID, PRD_CATEGORY, LOGIN_NAME, CURRENCY /*, Some more aggregated fields*/
    from
        VENDOR_RECORD
    where
        (
            order_time between SYS_CONTEXT('CTX_ALERT', 'rptBeginTime') and SYS_CONTEXT('CTX_ALERT', 'rptEndTime')
            AND order_time between SYS_CONTEXT('CTX_ALERT', 'RESTRICT_BEGIN_TIME') AND SYS_CONTEXT('CTX_ALERT', 'RESTRICT_END_TIME')
        )
        and
        (
            (
                SYS_CONTEXT('CTX_ALERT', 'rptVENDOR_ID') = '*'
                or
                (
                    VENDOR_ID in
                    (
                        select
                            regexp_substr(SYS_CONTEXT('CTX_ALERT', 'rptVENDOR_ID'), '[^, ]+',1, rownum) str
                        from
                            dual connect by level <= regexp_count (SYS_CONTEXT('CTX_ALERT', 'rptVENDOR_ID'), '[^, ]+')
                    )
                )
            )
            AND
            (
                SYS_CONTEXT('CTX_ALERT', 'RESTRICT_VENDOR_ID') = '*'
                or
                (
                    VENDOR_ID in
                    (
                        select
                            regexp_substr(SYS_CONTEXT('CTX_ALERT', 'RESTRICT_VENDOR_ID'), '[^, ]+',1, rownum) str
                        from
                            dual connect by level <= regexp_count (SYS_CONTEXT('CTX_ALERT', 'RESTRICT_VENDOR_ID'), '[^, ]+')
                    )
                )
            )
        )
        and
        (
            (
                SYS_CONTEXT('CTX_ALERT', 'rptPRD_CATEGORY') = '*'
                or
                (
                    PRD_CATEGORY in
                    (
                        select
                            regexp_substr(SYS_CONTEXT('CTX_ALERT', 'rptPRD_CATEGORY'), '[^, ]+',1, rownum) str
                        from
                            dual connect by level <= regexp_count (SYS_CONTEXT('CTX_ALERT', 'rptPRD_CATEGORY'), '[^, ]+')
                    )
                )
            )
            AND
            (
                SYS_CONTEXT('CTX_ALERT', 'RESTRICT_PRD_CATEGORY') = '*'
                or
                (
                    PRD_CATEGORY in
                    (
                        select
                            regexp_substr(SYS_CONTEXT('CTX_ALERT', 'RESTRICT_PRD_CATEGORY'), '[^, ]+',1, rownum) str
                        from
                            dual connect by level <= regexp_count (SYS_CONTEXT('CTX_ALERT', 'RESTRICT_PRD_CATEGORY'), '[^, ]+')
                    )
                )
            )
        )
        and
        (
            (
                SYS_CONTEXT('CTX_ALERT', 'rptLOGIN_NAME') = '*'
                or
                (
                    LOGIN_NAME in
                    (
                        select
                            regexp_substr(SYS_CONTEXT('CTX_ALERT', 'rptLOGIN_NAME'), '[^, ]+',1, rownum) str
                        from
                            dual connect by level <= regexp_count (SYS_CONTEXT('CTX_ALERT', 'rptLOGIN_NAME'), '[^, ]+')
                    )
                )
            )
            AND
            (
                SYS_CONTEXT('CTX_ALERT', 'RESTRICT_PRD_CATEGORY') = '*'
                or
                (
                    LOGIN_NAME in
                    (
                        select
                            regexp_substr(SYS_CONTEXT('CTX_ALERT', 'RESTRICT_PRD_CATEGORY'), '[^, ]+',1, rownum) str
                        from
                            dual connect by level <= regexp_count (SYS_CONTEXT('CTX_ALERT', 'RESTRICT_PRD_CATEGORY'), '[^, ]+')
                    )
                )
            )
        )
        -- A DIRTY HACK TO MAKE THE QUERY RETURNS DATA
        AND ROWNUM >= 0
    group by
        VENDOR_ID, PRD_CATEGORY, LOGIN_NAME, CURRENCY
)

这个问题让我发疯，我想问一下背后的原因，谢谢。

EDITED：有关VENDOR_RECORD

的更多信息

Oracle版本：11g（11.2.0.4.0）
这是一个非常庞大的存档表（每个日期＆gt; 10M记录），并按＆＃34; order_time＆＃34;
它的目的是成为一个分析DB而不是实时事务DB，因此不需要非常实时的响应。另一方面，准确性很重要。

Answer 1

看起来很奇怪，但是您可以通过在视图中作为注释创建一些条件来调试代码，我相信您会找出导致问题的行。添加＆＃34; AND rownum＆gt; 0＆＃34;如果查询看起来很复杂，那么调试它是不够的，只需先进行调试。

带有应用程序上下文的Oracle视图使用＆＃34; group by＆＃34;没有奇怪的黑客就没有结果

1 个答案: