How much time does it take for your team to deliver your freshly updated applications to all the environments and customers? In case you just play with APEX and ORDS, it is totally ok for you to export and import your workspaces, applications and RESTful Services definitions manually using web-based interface (under App Builder > Export/Import and SQL Workshop > RESTful Services > RESTful Data Services). But it is obviously not a suitable way for more or less serious development, and, surely, for the enterprise use.
Let's imagine you have a team of several developers who do different job and once a couple of days you need to deliver their changes to all the environments. If your team develops a single application in a single workspace, which is supposed to be deployed to a single test environment and a single production server, you still can do all this manually. It's just not the time for you. Yet.
But imagine you have several testing platforms, and dozens or even hundreds of customers. In such a case it becomes more or less impossible to deliver all the changes as frequently as you could do, providing you had the only customer. However, many people continue exploiting the manual approach, and don't even realise they're doing it wrong.
That's why we need automation - to stop losing our time. More than two years ago Martin D'Souza already wrote about how APEX applications could be exported and imported using SQLcl. That article was a good start for me, though, I didn't want to be dependant on SQLcl or any other specific tool, and needed to do even more - deploy not only APEX applications, but also APEX workspaces and RESTful Data Services modules definitions.
So, my ultimate goal was to work out a way to create an applicable set of SQL-scripts with the definitions of all the mentioned database objects from the database metadata.
Additionally, this set of scripts had to be universal, which means they had to be compatible with the SQL*Plus, SQLcl and SQL Developer.
And this is what I finally ended up with.
The first thing you deploy in order for your APEX applications to work, is your workspaces. Actually, if you have the only server in production environment, automation of this step is quite optional and you can still do the job using the stanard web-based interface (Instance Administration > Manage Workspaces > Export Import > Export Workspace). But if you're going to install your applications on some number of hosts with their own database instances, it's a very good idea not to do everything by your bare hands.
To export workspace definitions we are going to use
APEX_EXPORT.GET_WORKSPACE API. Mind the fact that you need to run the script below as a parsing schema user (which is associated with the workspace), or as
SYS, otherwise you're going to get the
ORA-20987: APEX - Security Group ID (your workspace identity) is invalid. - Contact your application administrator exception.
-- connecting to the instance (parsing schema user could be used instead of SYS) connect sys as sysdba set timing on timing start TIMER_WORKSPACE_EXPORT -- SQL*Plus environment settings -- they are crucial to retrieve a consistent export file set feedback off set heading off set echo off set flush off set termout off set pagesize 0 set long 100000000 longchunksize 32767 column output format a4000 set linesize 4000 set trimspool on -- variable for storing the export data variable contents clob -- generating the export file declare l_files apex_t_export_files; begin l_files := apex_export.get_workspace( p_workspace_id => 100500, p_with_date => false, p_with_team_development => false, p_with_misc => true ); -- in the first file we have the needed export data :contents := l_files(1).contents; end; / -- you can specify any file name here spool my_workspace_export.sql print contents spool off timing stop TIMER_WORKSPACE_EXPORT exit
Notice that the size of the export data can be large (though this is mostly true for application exports), that's why we need to set proper SQL*Plus environment settings.
Exporting of your APEX applications looks very similar to what you've just seen above. But there's a huge difference in the frequency of its usage - you need to export an application every time you need to get a new version of it in order to deliver the changes to your customers. Even if there's only one.
As before, to export application we are going to use APEX's PL/SQL API, but this time it's going to be
APEX_EXPORT.GET_APPLICATION. Again, you must connect as a parsing schema user (which is associated with the workspace with the application to export), or as
SYS to run the script.
-- connecting to the instance (parsing schema user could be used instead of SYS) connect sys as sysdba set timing on timing start TIMER_APP_EXPORT -- SQL*Plus environment settings -- they are crucial to retrieve a consistent export file set feedback off set heading off set echo off set flush off set termout off set pagesize 0 set long 100000000 longchunksize 32767 column output format a4000 set linesize 4000 set trimspool on -- variable for storing the export data variable contents clob -- generating the export file declare l_files apex_t_export_files; begin l_files := apex_export.get_application( p_application_id => 150, p_with_ir_public_reports => true, p_with_ir_private_reports => true, p_with_ir_notifications => true, p_with_translations => true, p_with_comments => true, p_with_acl_assignments => true ); :contents := l_files(1).contents; end; / -- you can specify any file name here spool my_app_export.sql print contents spool off timing stop TIMER_APP_EXPORT exit
As a result you will get a huge SQL-script which contains metadata of all the application pages and even static application files. You also have an option to generate a separate file for each application page if you specify the
p_split parameter value as
In this chapter we are going to consider only the ORDS-based RESTful Services, which is quite a standard at the moment.
To export ORDS modules you, as usual, can use the comfortable APEX's browser interface (under SQL Workshop > RESTful Services > RESTful Data Services > Export), but again it doesn't hurt much to automate the process, at least if your RESTful services tend to evolve through time. And once more time, there's an existing blog post by Tim Hall on how to do all this using SQLcl. And still, I didn't want to be dependant on it, hence needed a different approach.
So, we're going to use the
ORDS_EXPORT PL/SQL package in the
ORDS_METADATA schema, which is, unfortunately, still not documented properly. Actually, under the hood exactly this package is used by the APEX SQL Workshop's pages.
To get a correct export file, you need to run the script below as a REST-enabled schema user.
-- connecting to the instance (you must use the REST-enabled schema user - RESTAPI in this case) connect restapi set timing on timing start TIMER_REST_EXPORT -- SQL*Plus environment settings -- they are crucial to retrieve a consistent export file set feedback off set heading off set echo off set flush off set termout off set pagesize 0 set long 100000000 longchunksize 32767 column output format a4000 set linesize 4000 set trimspool on -- variable for storing the export data variable contents clob -- generating the export file begin :contents := ords_metadata.ords_export.export_schema(); end; / -- you can specify any file name here spool my_rest_modules_export.sql print contents -- the trailing '/' symbol is needed to terminate the generated PL/SQL block prompt / spool off timing stop TIMER_REST_EXPORT exit
After running the script, you end up with exactly the same SQL-script as though you used the SQL Workshop's interface.
It's also possible to export a particular module, if you like, for this exact purpose there's another function
export_module(p_module_name => 'MY_MODULE') in the
ORDS_EXPORT package. Check out the package specification for more info on this.
Generally, the import process is quite simple if you did everything right, since all the exported files are usual SQL-scripts which can be executed by your favourite tool. The only difference here is the user as whom you should run the scripts.
To import a workspace, you must be connected to the database as APEX internal user (for instance,
APEX_180100) or as
SYS (but in this case you should change your current schema to the APEX internal user's by invoking, in our case,
alter session set current_schema = APEX_1801000; statement).
Note the fact that if you go for the APEX internal user, it is usually in the locked state, so you first need to unlock it and set a password for the user. After doing the job (the import), the APEX internal user must be locked back, because leaving it unlocked is way dangerous.
You also should be in the directory where the script resides, since we're going to load it directly.
-- connecting to the instance as SYS connect sys as sysdba -- changing the current schema alter session set current_schema = APEX_180100; set echo on set timing on set serveroutput on set linesize 120 whenever sqlerror continue none timing start TIMER_WORKSPACE_IMPORT spool workspace_import.log @my_workspace_export.sql spool off set serveroutput off purge recyclebin; timing stop TIMER_WORKSPACE_IMPORT exit
Things could be a little different with the APEX applications import, due to the fact it has its own API to configure the process. It's done by using the
APEX_APPLICATION_INSTALL package. Though, its usage is totally optional and is needed only if you intend to change something about the application before the actual import. There's even a set of examples on how to use the package in the official documentation.
Here I'm going to show the trivial situation when you're okay with the defaults (no need to change of application ID, offset, workspace, alias or any other application property). The script below should be run as a parsing schema user.
-- connecting to the instance as a parsing schema user APEX_APP connect apex_app set echo on set timing on set serveroutput on set linesize 120 whenever sqlerror continue none timing start TIMER_APP_IMPORT spool app_import.log @my_app_export.sql spool off set serveroutput off purge recyclebin; timing stop TIMER_APP_IMPORT exit
To import your recently exported RESTful Data Services definitions you should switch to the REST-enabled schema user and change the name of the script.
-- connecting to the instance as a REST-enabled schema user RESTAPI connect restapi set echo on set timing on set serveroutput on set linesize 120 whenever sqlerror continue none timing start TIMER_REST_IMPORT spool rest_services_import.log @my_rest_modules_export.sql spool off set serveroutput off purge recyclebin; timing stop TIMER_REST_IMPORT exit
Obviously, the mentioned scripts could be put together when you work with your particular situation and when you know what you're doing. The only point here is that separate scripts give you more freedom when it comes to automation. You can set up your own pipelines to run particular scripts when a particular event occurs.
But where is the automation?
Right. We only wrote a bunch of scripts and nothing more. But as I like to say, automation starts where interactivity stops. All web-based user interfaces are interactive and need a human to function, but the set of scripts, which we worked out, could be used in both interactive and non-interactive ways. Which means, you can definitely use them with your favourite CI/CD tool.
It could cost you some time and effort in the beginning to set up all this, but will save much more in the future. And stopping wasting time on the routine on every day basis is not the only reason. Automation of deployments enables you to implement such things as automated testing, continious integration and delivery, which, in their turn, decrease number of bugs in your code and shortens the time your customers see the brand-new funtionality.
I think it's enough to try, isn't it?
Do you have any other ideas how to automate development process with APEX and ORDS worth sharing? You're warmly welcome to put it here in the comments section - we'll definitely discuss them all!
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