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Modern Catalyst applications make three changes to the fat controller to ameliorate these issues First, business logic is aggressively pushed back into the model so the controller becomes entirely agnostic to the implementation It merely checks for the validity of data received; if valid, it then asks the model if it can perform an operation, and if not valid, it sets up appropriate error/informational data for the view This permits the controller to focus almost entirely on UI event handling and state maintenance, easing reuse of code for common situations such as forms and list views Second, the domain/business objects move back outside the primary hierarchy of the web application and become entirely independent of the application itself This permits them to be reused and unit tested outside the context of the UI code.

By executing some test queries, it becomes apparent which columns of the USER_CONSTRAINTS view you need. Let s look at a first attempt to generate the ALTER TABLE commands. Solution 11-4a. First Attempt to Generate the Correct SQL SQL> select 'ALTER TABLE '||table_name||' DISABLE CONSTRAINT 2 '||constraint_name||';' 3 from user_constraints; However, if you capture the output from this query in a script file and execute it, you will discover that there is room for improvement. Some ALTER TABLE commands may fail with the following message: ORA-02297: cannot disable constraint (BOOK.xxx) - dependencies exist You can fix this problem in two ways: Add the CASCADE keyword to the generated ALTER TABLE commands. Sort the ALTER TABLE commands in such a way that all primary keys are disabled before the foreign key constraints.

In addition to field data types, you can set other attributes for individual fields When modifying the structure of a database from the File Modify menu, available attributes appear as a series of check boxes just under the Name and Type text fields Image: You must set only one field as the image key for a Concordance database, if the database is linked with an optional image viewer, such as Opticon When the viewer is opened (by means of the camera button , which appears on the bottom of the screen in Concordance s Table or Browse view ), the image key value is passed to the viewer, which uses that data to identify the file paths of the corresponding set of images that are associated with the document record.

The model component of the application then becomes a thin adaptor that simply loads the external domain objects, instantiates them, and exposes them to the application This means that a single-model class such as a Catalyst::Model::DBIC::Schema can adapt an entire database rather than requiring one model per table..

Let s implement both fixes. Also, let s add a WHERE clause to the query to avoid generating ALTER TABLE commands for constraints that are disabled already. Solution 11-4b. Second Attempt to Generate the Correct SQL SQL> 2 3 4 5 select 'ALTER TABLE '||table_name||' DISABLE CONSTRAINT '||constraint_name ||' CASCADE;' from user_constraints where status <> 'DISABLED' order by case constraint_type when 'P' then 1 else 2 end;

Finally, now that you are satisfied with the result of the query, you add the appropriate SQL*Plus commands to capture and execute the query result. The final script looks like the following. Solution 11-4c. SQL*Plus Script to Disable All Constraints of a Schema set pagesize 0 verify off feedback off trimspool on spool doit.sql replace select 'ALTER TABLE '||table_name|| ' DISABLE CONSTRAINT '||constraint_name||' CASCADE;' from user_constraints where status <> 'DISABLED' order by case constraint_type when 'P' then 1 else 2 end; spool off @doit exit You can build many useful SQL*Plus scripts, once you have discovered how you can use SQL*Plus as a command generator.