FairCom DB API API for Java

Relationships

drivers\java.nav\tutorials\JTDB_Tutorial2.java

Now we will build some table/file relationships using the FairCom DB API Java API.

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 logic:

public class JTDB_Tutorial2 {

static CTSession MySession;

static CTTable tableCustOrdr;

static CTTable tableOrdrItem;

static CTTable tableItemMast;

static CTTable tableCustMast;

static CTRecord recordCustOrdr;

static CTRecord recordOrdrItem;

static CTRecord recordItemMast;

static CTRecord recordCustMast;

public static void main(String[] args) throws IOException {

// TODO code application logic here

Initialize();

Define();

Manage();

Done();

}

We suggest opening the source code with your own editor.

Continue now to review these four steps.

In This Section Init Define Manage Done