Recently we had a customer who wanted to have read only access to all tables in a schema, even tables not created yet. Apparently in Microsoft SQLServer, there is a way to grant a user schema permissions and includes objects not created yet.
Since i am unaware of a way to do this automagically in Oracle, i decided to create a “after ddl” trigger on the schema to grant the permissions when objects are created. The challenge is that pl/sql doesn’t allow running ddl permissions, i had to create a work around for the pl/sql and ddl challenges. The resolution was to use dbms.job_submit (Thanks “Ask Tom”) and submit a job to run the permissions.
Here is the code I used and please modify to suit your needs: (For this example i’m using IOUG as the application name/user)
#1 – Create a read only role first:
Create role IOUG_READONLY;
#2 – Grant read only role to the user (IOUG) requiring the permissions
grant IOUG_READONLY to IOUG;
#2 – Connect to application schema user (Owns objects) and create “after ddl” trigger (Sorry for the doublespace !)
CREATE or REPLACE TRIGGER AFTER_DDL AFTER DDL on IOUG_OBJECTS.SCHEMA
select ora_sysevent into v_sysevent from dual;
if ( v_sysevent in ('CREATE') )
v_message := 'execute immediate "grant select on IOUG_OBJECTS.'||ora_dict_obj_name||' to IOUG_READONLY";';
dbms_job.submit (l_job,replace(v_message,'"','''') ) ;
Now whenever a new object gets created the role is granted via the pl/sql and dbms_job. The following is a test output:
IOUG_OBJECTS@IOUGDEV > create table foo1 (col1 varchar2(255));
IOUG_OBJECTS@IOUGDEV > connect IOUG/pw
IOUG@IOUGDEV > select * from IOUG_OBJECTS.foo1;
no rows selected
IOUG@IOUGDEV > desc IOUG_OBJECTS.foo1;
Name Null? Type
—————————————– ——– —————————-
select * from IOUG_OJBECTS. OBJECT_NAME *** NOTE – You must put the schema name before the table name (IOUG_OBJECTS), because the grants didn’t include the a public synonym.
Please let me know if this works for you and big thanks to “Ask Tom” who helped me resolve the PL/SQL and DDL issue. Also, please let me know if there is a automagic way to do this Oracle.