c-treeDB API for C#

Tutorial 3: Row/Record Locking

<faircom>\drivers\csharp.nav\tutorials\Tutorial3.cs

Now we will explore row/record locks using the c-tree Database API for C#.

The functionality for this tutorial focuses on inserting/adding rows/records, then updating a single row/record in the customer master table under locking control. The application will pause after a LOCK is placed on a row/record. Another instance of this application should then be launched, which will block, waiting on the lock held by the first instance. Pressing the <Enter> key will enable the first instance to proceed. This will result in removing the lock thereby allowing the second instance to continue execution. Launching two processes provides a visual demonstration of the effects of locking and a basis for experimentation on your own.

As with 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 #3: Locking

Here we demonstrate the enforcement of data integrity by introducing record/row "locking".

Initialize() - Connects to the FairCom Database Engine.
Define() - Defines and creates a "customer master" (custmast) table/file.
Manage() - Adds a few rows/records, manipulates them, and displays the results.
Done() - Disconnects from FairCom Database Engine.

Note our simple Main() function:

using System;

using FairCom.CtreeDb;

using FairCom.CtreeDb.ENUMS;

namespace Tutorial3

{

class Tutorial3

{

static CTSession MySession;

static CTTable MyTable;

static CTRecord MyRecord;

// 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.

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