How can I conditionally display entries in a column as links only if a query does not come up empty?

Pearl

I have a table that looks like the following:

The SQL query I used for this interactive report (static ID = 'STEM') is as follows:

select MOCKSTEMS.WORD_ID,
       MOCKSTEMS.STEM_ID,
       MOCKSTEMS.LABSTEM,
       MOCKSTEMS.LABSTEMCATEGORY,
       MOCKLEMMAS.LEMMAFORM,
       MOCKSTEMS.LEMMA_ID,
       MOCKWORDS.ORIGINALWORD,
       MOCKSTEMS.CONTAINEDIN
from MOCKSTEMS
inner join MOCKWORDS on MOCKSTEMS.WORD_ID = MOCKWORDS.WORD_ID
inner join MOCKLEMMAS on MOCKSTEMS.LEMMA_ID = MOCKLEMMAS.LEMMA_ID

There are 2 interactive reports on this page; the other one (static ID = 'MORPH') has the following query:

select MOCKSTEMS.WORD_ID,
       MOCKSTEMS.STEM_ID,
       MOCKMORPHS.MORPHEME_ID,
       MOCKMORPHS.LABMORPHEME,
       MOCKMORPHS.LABMORPHEMECATEGORY,
       MOCKLEMMAS.LEMMAFORM,
       MOCKMORPHS.LEMMA_ID,
       MOCKWORDS.ORIGINALWORD
from MOCKMORPHS
inner join MOCKSTEMS on MOCKMORPHS.STEM_ID = MOCKSTEMS.STEM_ID
inner join MOCKWORDS on MOCKSTEMS.WORD_ID = MOCKWORDS.WORD_ID
inner join MOCKLEMMAS on MOCKMORPHS.LEMMA_ID = MOCKLEMMAS.LEMMA_ID

Currently, the 'Lab Stem' column contains links that applies a filter on each of the 2 interactive reports on this page (page 11):

However, I only want to display the entry as a link (i.e. in blue text) if there are results in either the STEM interactive report or the MORPH interactive report with the filters applied.

How can I do this?

I'm thinking I could create a column in my SQL query that counts the number of rows that would satisfy my condition, but I'm not quite sure how to incorporate that into my current SQL query.

Any help would be appreciated. Thank you!

pkpanda

You need to create the link at query time like

select '<span class="navigation">' ||
    CASE
        WHEN ID = 'STEM' THEN
            '<a class="navigation" title="Edit" href="' || APEX_UTIL.PREPARE_URL('f?p=&APP_ID.:11:&SESSION.::NO:RP,11:P11_ID:'
            || CONTAINEDIN) || '" style= "padding: 5px;"><img src="#IMAGE_PREFIX#app_ui/img/icons/apex-edit-pencil-alt.png" class="apex-edit-pencil-alt" alt=""></a>'
        ELSE
            '<a class="navigation" title="View" href="' || APEX_UTIL.PREPARE_URL('f?p=&APP_ID.:11:&SESSION.::NO:RP,11:P11_ID:'
            || STEM_ID) || '" style= "padding: 5px;"><img src="#IMAGE_PREFIX#app_ui/img/icons/apex-edit-view.png" class="apex-edit-view" alt=""></a>'
    END 
          AS Action_links ,
      MOCKSTEMS.WORD_ID,
       MOCKSTEMS.STEM_ID,
       MOCKSTEMS.LABSTEM,
       MOCKSTEMS.LABSTEMCATEGORY,
       MOCKLEMMAS.LEMMAFORM,
       MOCKSTEMS.LEMMA_ID,
       MOCKWORDS.ORIGINALWORD,
       MOCKSTEMS.CONTAINEDIN
from MOCKSTEMS
inner join MOCKWORDS on MOCKSTEMS.WORD_ID = MOCKWORDS.WORD_ID
inner join MOCKLEMMAS on MOCKSTEMS.LEMMA_ID = MOCKLEMMAS.LEMMA_ID

change escape special char property of action_links to no to get the html translated. Hope this will help you

Scott Wesley

Yes, but don't use &SESSION. in your SQL, use the bind variable instead. Otherwise you blow away your SQL shared pool.

Pearl

https://community.oracle.com/tech/developers/discussion/comment/16802412#Comment_16802412

What is the "bind variable"?

Pearl

@pkpanda Thank you for your answer. I tried using that query, but I get an error:

Do you have any ideas why?

Scott Wesley

when ID = 'STEM'

what data type is the ID column?

Bind variable:

:APP_SESSION

https://docs.oracle.com/en/database/oracle/application-express/19.2/htmdb/understanding-substitution-strings.html#GUID-E6B36FCC-3756-4F24-B6C0-A0798E605E9E

Discussion as to why

http://www.grassroots-oracle.com/2012/02/apex-variables-in-sql.html

Pearl

@Scott Wesley There is no column named 'ID' in the MOCKSTEMS table. The MOCKSTEMS table looks like this:

'STEM' is the static ID of the interactive report:

pkpanda

What is the field that identify the two different report put the column in the case statement or if you can create the app in apex.oracle.com then we can find the issue.