Posts
Removing all objects for a user
From this post, here’s a way to purge all the objects for a user. You can use this if you don’t have SYS access. select 'drop '||object_type||' '|| object_name|| DECODE(OBJECT_TYPE,'TABLE',' CASCADE CONSTRAINTS;',';') from user_objects You should spool this to a file and then run that file. Then to really remove them, use : purge recyclebin; This works on Oracle 10g2.
Using COLUMN in SQL*Plus
Here’s something I learned about SQL*Plus today. If you want to create a variable in a script, you can use the COLUMN command. In the following script, 2 variables called HOST_NAME and DATABASE_NAME are created. Their values are filled in when the SELECT statement executes. col host_name new_value HOST_NAME col instance_name new_value DATABASE_NAME SELECT host_name, instance_name FROM v$instance; UPDATE table SET value = '&&HOST_NAME'
Using Oracle with Ruby on Rails
If you want to use the Ruby Oracle OCI driver with Ruby on Rails, you might run into problems with the configuration. In the database.yml file, the following should be used to specify the host : host: localhost/mydatabase The mydatabase part is the the name of your database. For the adapter ‘oci’ should be specified. The database, username and password fields should be filled in as usual. Thanks to Duane’s Brain for pointing that out.
Paginating the results from a query in Oracle
MySql has some interesting additions to standard SQL to show paginated results : the LIMIT n OFFSET skip clause. The website http://troels.arvin.dk/db/rdbms/#select-limit-offset shows a way of doing this in Oracle.