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drivers\csharp.sql.ado.net\tutorials\CSharpTutorial3.cs
Now we will explore row/record locks using the FairCom DB ADO.NET Data Provider using 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".
Note our simple Main() function:
using System;
using Ctree.Data.SqlClient;
namespace CSharpTutorial
{
class Tutorial3
{
// declare connection, command and reader objects
static CtreeSqlConnection conn;
static CtreeSqlCommand cmd;
static CtreeSqlDataReader rdr;
//
// main()
//
// The main() function implements the concept of "init, define, manage
// and you're done..."
//
static void Main()
{
Initialize();
Define();
Manage();
Done();
Console.Write("\nPress <ENTER> key to exit . . .");
Console.ReadLine();
}
We suggest opening the source code with your own editor.
Continue now to review these four steps.
