Create RESTful web service to download BLOB content

By
I have been using RESTful API to download BLOB content as a file. This is very useful in many places where you want to give your BLOB document as a source to URL. This can be used within Oracle APEX or outside Oracle APEX.

Following are the steps to create RESTful web service using Media Resource type to make your BLOB document downloadable.




Use following link as a live demo, which will return product image for product_id = 1.



Hope this helps.

Jaydip Bosamiya
jbosamiya@gmail.com

Comments

  1. VeerendraOctober 9, 2020 at 1:55 AM

    Hi,
    I am using the same method to get PDF document from DB.
    My query is
    select cd.blob_content, cd.name, 'application/pdf' mimetype
    from my_table cd
    where cd.document_id = :id

    However, I get
    500 Internal Server Error
    The request could not be processed because an error occurred whilst attempting to evaluate the SQL statement associated with this resource. Please check the SQL statement is correctly formed and executes without error. SQL Error Code: Invalid column type: getString/getNString not implemented for class oracle.jdbc.driver.T4CBlobAccessor, Error Message: {2}.

    Any ideas to solve this please?

    Thanks

    ReplyDelete
    Replies
    1. Jaydip BosamiyaOctober 9, 2020 at 9:00 AM

      Hello Veerendra,

      As per error message, it looks like the either sql statement has some error or is not in expecting format.

      Did you tried by rewriting your query as following columns sequence?

      select 'application/pdf' mimetype, cd.blob_content
      from my_table cd
      where cd.document_id = :id

      Regards,
      Jaydip Bosamiya

      Delete

Post a Comment

My photo
Jaydip Bosamiya
I am Oracle APEX Consultant, Blogger and Integrator. All-rounder in building small, medium and enterprise applications. Extensive knowledge in various area of web-driven applications in Back-end (PL/SQL, SQL, Java), Front-end (Oracle APEX, HTML, JavaScript, CSS, jQuery, OracleJET, ReactJS), RESTful APIs, Third-party library integrations (Apex Office Print (AOP), Payment Gateways, Syncfusion, HighCharts) and APEX Plugins (HighChart, StarRating)

Popular posts from this blog

Oracle APEX - Interactive Report - Scrollbars on Top

By
Image
I have been came across an interested requirement ( which is very valid ) to add scrollbars on the top of the regions! I have seen many times when you want to scroll right to see further data of first few records, you will scroll vertically to get to the horizontal scroll-bars. And then you do horizontal scroll and then vertical scroll to go top of the region. Aren't you ??? :-) So, to ease the user interaction with IR - we should have a scrolling option somewhere on the top of the region ? - For Sure So, how can we add scrollbars on top of the report for an Interactive Report ? By default IR Fix the column headers to the page. This setting gives us an opportunity to add scroll-bars just below the column header as well. Just by adding following CSS line you should get a beautiful scroll-bars just below you header and it works really great as well. #MYIR .t-fht-thead{   overflow: auto !important; } I am also trying to find a way to add same function...
Read more

How to create your own customized nested report regions using jQuery

By
Image
Here is how you can create cool nested reports in Oracle APEX and jQuery, which looks like below: For this example, I have used DEPT & EMP example where as a nested report it will show all the child records of employee under department record. To start with, first create a new classic report region with query like " select * from dept ". Add a new derived column of type = Link to that report and set following attributes: Link: javascript: void(0); Link Text: <i class="fa fa-users" alt="Employees" title="Employees"></i> Link Attribute: class="viewEmp" data-deptno="#DEPTNO#" Add new page item to hold deptno value and call it PX_DEPTNO Create new classic report region (this will be your nested region) and set query like " select * from emp where deptno = :PX_DEPTNO " and set following attributes: Static ID:  EMPLOYEES Custom Attributes:  style="display: none" Page Items t...
Read more

Make your RESTful APIs Secured with OAuth2 - Basic, Simple and Easy Steps

By
Its been a while since my previous article. So, here is my first blog post of 2020. Oracle APEX has an out-of-box and declarative support to create RESTful Web Services using ORDS. Within no-time, you can build and publish your RESTful APIs. Use of ORDS has gradually increased with common standard across different technology strongly adopted via RESTful Web Services and JSON formatted input/output. With the flexibility of data sharing across the technology or within application, we must also think of how secure my RESTful APIs are. We do believe in strong security of our applications using Authentication and Authorization. But, many times we miss the level of security we should implement in our RESTful APIs. So, here is the very simple and basic steps to secure your ORDS RESTful APIs using OAuth2: We will use a default oracle.example.hr web service module to add OAuth2 for this blog. Navigate to SQL Workshop > RESTful Services. From the left side of tree - click on "Ro...
Read more