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By Pete Su
+-Developing data models in OpenACS 5.5.0 is much like developing data models +Developing data models in OpenACS 5.6.0 is much like developing data models for OpenACS 3, save for the implementation. As usual, you need to examine how to model the information that the application must store and manipulate, and define a suitable set of SQL tables. In our Notes @@ -79,7 +79,7 @@ Fire up your text editor and open the ROOT/packages/notes/sql/oracle/notes-create.sql (ROOT/packages/notes/sql/postgresql/notes-create.sql for the PG version) file created when we created the package. Then, do the following: -
+
First, add an entry to the acs_object_types table with the following PL/SQL call:
begin @@ -139,7 +139,7 @@ because the new type note is a subtype of acs_object, it will inherit these attributes, so there is no need for us to define them. -
The next thing we do is make a small modification to the data model to reflect the fact that each row in the notes table represents something that is not only an object of type @@ -164,7 +164,7 @@ use the acs_objects table to find objects will transparently find any objects that are instances of any subtype of acs_objects. -
The next step is to define a PL/SQL package for your new type, and write some basic procedures to create and delete objects. Here is a package definition for our new type: @@ -212,7 +212,7 @@ object OBJ was "read only", then any other object that used OBJ as its context would also be "read only" by default. We'll talk about this more later. -
The PL/SQL package body contains the implementations of the procedures defined above. The only subtle thing going on here is that we must use acs_object.new to insert a row into @@ -315,7 +315,7 @@ models that are meant to be integrated with the OpenACS object system.
-There are two basic rules you should follow when designing OpenACS 5.5.0 data +There are two basic rules you should follow when designing OpenACS 5.6.0 data models: @@ -370,7 +370,7 @@ requires a good amount of thought at design time even for simple applications.