c-treeDB API for C

Tutorial 2: Relational Model and Indexing

drivers\c.nav\tutorials\ctdb_tutorial2.c

Now we will build some table/file relationships using the c-treeDB API for C.

This tutorial will advance the concepts introduced in the first tutorial by expanding the number of tables. We will define key columns/fields and create specific indexes for each table to form a relational model database.

Like all other examples in the c-tree tutorial series, this tutorial simplifies the creation and use of a database into four simple steps: Initialize(), Define(), Manage(), and You’re Done() !

Tutorial #2: Relational Model and Indexing

Here we add a bit more complexity, introducing multiple tables, with related indices in order to form a simple "relational" database simulating an Order Entry system. Here is an overview of what will be created:

• Initialize() - Connects to the FairCom Database Engine.
• Define() - Defines and creates the "custmast", "custordr", "ordritem" and the "itemmast" tables/files with related indexes.
• Manage() - Adds some related rows/records to all tables/files. Then queries the database.
• Done() - Disconnects from FairCom Database Engine.

Note our simple Main() function:

/*

* main()

*

* The main() function implements the concept of "init, define, manage

* and you're done..."

*/

#ifdef PROTOTYPE

NINT main (COUNT argc, pTEXT argv[])

#else

NINT main (argc, argv)

COUNT argc;

TEXT argv[];

#endif

{

Initialize();

Define();

Manage();

Done();

printf("\nPress <ENTER> key to exit . . .\n");

getchar();

return(0);

}

We suggest opening the source code with your own editor.

Continue now to review these four steps.

In This Section Init Define Manage Done