[teiid-issues] [JBoss JIRA] (TEIID-5725) Please improve documentation on definition of stored procedures, virtual functions and virtual procedures

[Christoph John (Jira)]

    [ https://issues.jboss.org/browse/TEIID-5725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13725098#comment-13725098 ] 

Christoph John edited comment on TEIID-5725 at 4/22/19 3:52 PM:
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Hello Steven,
I came up with a further question regarding virtual procedures. The question is related to transactions. Let's say I have multiple Teiid instances running which access the same mysql database, or alternatively other clients with direct access to the mysql database. Do I explicitly have to wrap my virtual procedures and functions which I write in the ddl file into a transaction? And how would the command syntax for this look like? 


Further question regarding visibility of stored procedures and functions. I learned from a discussion with Ramesh, that there is a visibility attribute which I can set on the entire schema to set all tables and functions inaccessible. However, in that case I would have to wrap each table I like to export to odata into a view, which seems like odd extra work for me.
My thinking is the following. If I have a stored procedure or function in the source database, I would like to use it within my virtual procedures but at the same time would not like to allow access via odata. Would it be possible to add a visibility option to the procedure definition in the dll definition? Or does something similar already exist?


was (Author: cjohn001):
Hello Steven,
I came up with a further question regarding virtual procedures. The question is related to transactions. Let's say I have multiple Teiid instances running which access the same mysql database, or alternatively other clients with direct access to the mysql database. Do I explicitly have to wrap my virtual procedures and functions which I write in the ddl file into a transaction? And how would the command syntax for this look like? 

> Please improve documentation on definition of stored procedures, virtual functions and virtual procedures
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: TEIID-5725
>                 URL: https://issues.jboss.org/browse/TEIID-5725
>             Project: Teiid
>          Issue Type: Enhancement
>            Reporter: Christoph John
>            Assignee: Steven Hawkins
>            Priority: Critical
>
> I refer to the discussion with Ramesh in 
> https://developer.jboss.org/message/989048#989048 and would like to ask for a more detailed explanation on how to write virtual procedures and functions. 
> -Especially, how are OUT and INOUT params set and how can they be obtained via odata. 
> - How is the return value of a virtual function set?
> - How are collections and arrays of collections returned?



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