FairCom ISQL

Record/Row Locking

<faircom>\drivers\sql.cli\tutorials\iSQL_Tutorial3.sql

Now we will explore row/record locks using the FairCom DB SQL ISQL - Interactive SQL Interface.

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 these steps in our SQL script:

SET ECHO OFF

-- Initialize

ECHO INIT;

-- Define

ECHO DEFINE;

-- Manage

ECHO MANAGE;

-- Done

ECHO 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