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General Programming Concepts:
Writing and Debugging Programs

ODM Example Code and Output

The following Fictional_Characters, Friend_Table, and Enemy_Table Object Classes and Relationships tables list the object classes and objects created by the example code in this section.

Table 6. Fictional_Characters
Story_Star (char) Birthday (char) Age (short) Friends_of (link) Enemies_of (link) Do_This (method)
Cinderella Once upon a time 19 Cinderella Cinderella echo Cleans House
Snow White Once upon a time 18 Snow White Snow White echo Cleans House

Table 7. Friend_Table
Friend_of (char) Friend (char)
Cinderella Fairy Godmother
Cinderella mice
Snow White Sneezy
Snow White Sleepy
Cinderella Prince
Snow White Happy

Table 8. Enemy_Table
Enemy_of (char) Enemy (char)
Cinderella midnight
Cinderella Mean Stepmother
Snow White Mean Stepmother

ODM Example Input Code for Creating Object Classes

The following example code in the MyObjects.cre file creates three object classes when used as an input file with the odmcreate command:

*      MyObjects.cre
*       An input file for ODM create utilities.
*       Creates three object classes:
*               Friend_Table
*               Enemy_Table
*               Fictional_Characters

class   Friend_Table {
        char    Friend_of[20];
        char    Friend[20];
};

class   Enemy_Table {
        char    Enemy_of[20];
        char    Enemy[20];
};

class   Fictional_Characters {
        char    Story_Star[20];
        char    Birthday[20];
        short   Age;
        link    Friend_Table Friend_Table Friend_of Friends_of;
        link    Enemy_Table Enemy_Table Enemy_of Enemies_of;
        method  Do_This;
};

* End of MyObjects.cre input file for ODM create utilities. *

The Fictional_Characters object class contains six descriptors:

The file containing this code must be processed with the odmcreate command to generate the object class files required by ODM.

ODM Example Output for Object Class Definitions

Processing the code in the MyObjects.cre file with the odmcreate command generates the following structures in a .h file:

* MyObjects.h
* The file output from ODM processing of the MyObjects.cre input
* file. Defines structures for the three object classes:
*       Friend_Table
*       Enemy_Table
*       Fictional_Characters
#include <odmi.h>

struct  Friend_Table {
       long     _id;     * unique object id within object class *
       long     _reserved;  * reserved field *
       long     _scratch;   * extra field for application use *
       char     Friend_of[20];
       char     Friend[20];
};

#define Friend_Table_Descs 2
extern struct Class Friend_Table_CLASS[];
#define get_Friend_Table_list(a,b,c,d,e) (struct Friend_Table * )odm_get_list (a,b,c,d,e)

struct  Enemy_Table {
        long    _id;
        long    _reserved;
        long    _scratch;
        char    Enemy_of[20];
        char    Enemy[20];
};
#define Enemy_Table_Descs 2
extern struct Class Enemy_Table_CLASS[];
#define get_Enemy_Table_list(a,b,c,d,e) (struct Enemy_Table * )odm_get_list (a,b,c,d,e)

struct  Fictional_Characters {
        long    _id;
        long    _reserved;
        long    _scratch;
        char    Story_Star[20];
        char    Birthday[20];
        short   Age;
       struct  Friend_Table *Friends_of;    * link *
        struct  listinfo *Friends_of_info;   * link *
        char    Friends_of_Lvalue[20];       * link *
        struct  Enemy_Table *Enemies_of;     * link *
        struct  listinfo *Enemies_of_info;   * link *
        char    Enemies_of_Lvalue[20];       * link *
        char    Do_This[256];                * method *
};

#define Fictional_Characters_Descs 6
 
extern struct Class Fictional_Characters_CLASS[];
#define get_Fictional_Characters_list(a,b,c,d,e) (struct Fictional_Characters * )odm_get_list (a,b,c,d,e)

* End of MyObjects.h structure definition file output from ODM    * processing.

ODM Example Code for Adding Objects to Object Classes

The following code can be processed by the odmadd command to populate the object classes created by the processing of the MyObjects.cre input file:

* MyObjects.add
* An input file for ODM add utilities.
* Populates three created object classes:
*       Friend_Table
*       Enemy_Table
*       Fictional_Characters

Fictional_Characters:
Story_Star = "Cinderella" #a comment for the  MyObjects.add file.
Birthday        =       "Once upon a time"
Age             =       19
Friends_of      =       "Cinderella"
Enemies_of      =       "Cinderella"
Do_This =               "echo Cleans house"

Fictional_Characters:
Story_Star      =       "Snow White"
Birthday        =       "Once upon a time"
Age             =       18
Friends_of      =       "Snow White"
Enemies_of      =       "Snow White"
Do_This   =              "echo Cleans house"

Friend_Table:
Friend_of       =       "Cinderella"
Friend          =       "Fairy Godmother"

Friend_Table:
Friend_of       =       "Cinderella"
Friend          =       "mice"

Friend_Table:
Friend_of       =       "Snow White"
Friend          =       "Sneezy"

Friend_Table:
Friend_of       =       "Snow White"
Friend          =       "Sleepy"

Friend_Table:
Friend_of       =       "Cinderella"
Friend          =       "Prince"

Friend_Table:
Friend_of       =       "Snow White"
Friend          =       "Happy"

Enemy_Table:
Enemy_of        =       "Cinderella"
Enemy           =       "midnight"

Enemy_Table:
Enemy_of        =       "Cinderella"
Enemy           =       "Mean Stepmother"

Enemy_Table:
Enemy_of        =       "Snow White"
Enemy           =       "Mean Stepmother"

* End of MyObjects.add input file for ODM add utilities. *

Note: The * (asterisk) or the # (pound sign) comment above will not go into the object file; it is only for the .add file as a comment. The comment will be included in the file and treated as a string if it is included inside the " " (double quotes).

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