c-treeDB API for C#

Tutorial 2: Relational Model and Indexing

<faircom>\drivers\csharp.nav\tutorials\Tutorial2.cs

Now we will build some table/file relationships using the c-tree Database 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:

using System;

using FairCom.CtreeDb;

using FairCom.CtreeDb.ENUMS;

namespace Tutorial2

{

class 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;

//

// main()

//

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

// and you're done..."

//

[STAThread]

static void Main(string[] args)

{

Initialize();

Define();

Manage();

Done();

Console.WriteLine("\nPress <ENTER> key to exit . . .");

Console.ReadLine();

}

We suggest opening the source code with your own editor.

Continue now to review these four steps.

In This Section Init Define Manage Done