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c# and udb 8.2

We're currently using udb 7.2 on OS/2 and thinking about moving on to
8.1/8.2 on Windows. In presenting the benefits of such a move I have
been unable to find out if the APIs available to C in 7.2/7.2 are
available in C# in 8.1/8.2. With udb 8.2 can I back up and restore the
database (for example) natively through c#?

Nov 12 '05 #1
2 1254
Which APIs are you interested in?

While I don't think a lot of them have native .NET interfaces, with C#
you always have the option of using DllImport & unsafe to call C methods
directly.

internal class myDB2APIs
{
[DllImport("libn ame.dll", CallingConventi on=CallingConve ntion.StdCall)]
internal static unsafe extern RCTYPE funcname(<input types>);
....
}
Where "libname.dl l" is the DLL that contains the APIs you want to
invoke, RCTYPE is the return type (typically either int or void), and
<input types> corresponds to the variables you pass into the method.
For instance, a char[] becomes string, int becomes, well, int, and any
pointers should be IntPtr.

Of course, a lot of the DB2 APIs take structures (the SQLCA comes
immediately to mind) which you COULD use LayoutKind.Expl icit structures
to create .NET versions of this, that would be extremely time consuming
for you. What I'd actually recommend is writting a series of C wrapper
functions for the various APIs you want to call, and then defining C#
wrappers for those APIs.
For instance (WARNING: the following provided without warranty -- it's
just to give you the idea):

Create a DLL "ourDB2Wrappers .dll" which contains the DB2 code to attach
to an instance in the function "attachToInstan ce"

// All our classes will inherit from this so that we can use a common
// handler to clean up any information they have hanging around
public interface hasCloseMethod
{
void Close();
}

// A class to manage an instance attachment
public class ourInstanceAtta ch implements hasCloseMethod
{
// Import our wrapper functions
[DllImport("ourD B2Wrappers.dll" ,
CallingConventi on=CallingConve ntion.StdCall)]
private static unsafe extern int attachToInstanc e(String nodeName,
String userName,
String passWord);

private static unsafe extern int detachFromInsta nce();
...

private bool attached = false;

// A hashtable of instance objects created using this instance
// attachment. We'll use this so we can close them automatically
// when the Close() method of the instach attachment is called.
//
// For this example, I'll say you defined a similar class for
// database monitor snapshots.
private HashTable instanceObjects = new HashTable;

// Default constructor -- does nothing
public ourInstanceAtta ch()
{
}

// Constructor to attach at the same time
public outInstanceAtta chString nodeName, String userName,
String passWord)
{
Attach(nodeName , userName, passWord);
}

// Attach to the specified instance
public void Attach(String nodeName, String userName,
String passWord)
{
// Close the current attachment if already open
Close();

if (attachToInstan ce(nodeName, userName, passWord) != 0)
{
attached = true;
}
else
{
throw new Exception("Inst ance attachment failed.");
}
}

// Detach from the instance
public void Close()
{
if (attached)
{
foreach(Diction aryEntry curEntry in instanceObjects )
{
// Add error handling, yadayada
((hasCloseMetho d)curEntry.Valu e).Close();
}
if (detatchFromIns tance)
{
attached = false;
}
else
{
throw new Exception("Inst ance detach failed");
}
}
}

public ourDBSnapshot GetDBSnapshot(//some parameters, perhaps?)
{
ourDBSnapshot rValue = null;

// Add error handling
if (attached)
{
// Create the snapshot object. Note that we'll give it a
// reference to this instance object so that it can remove
// itself from our hashtable if it closes before us.
ourDBSnapshot rValue = new ourDBSnapshot(t his, others?);

// Add it to the list
instanceObjects .Add(rValue, rValue);
}
}
...
}

public class ourDBSnapshot implements hasCloseMethod
{
private IntPtr memoryReference = null;

// I don't want to go into details here, as this is fairly complex.
//
// It would have an IntPtr to hold value of the memory pointer
// returned by the following function. You'd then pass in that
// IntPtr to the individual calls to populate the monitor data
// stream, get the values you want out of the stream, and of
// course in the close method you'll need to call another method
// to free the memory.
// getDBSnapshotMe mory would call the monitor requesting the
// estimated size of the snapshot, and allocate and return a
// pointer to a block of memory that size.
[DllImport("ourD B2Wrappers.dll" ,
CallingConventi on=CallingConve ntion.StdCall)]
private static unsafe extern IntPtr getDBSnapshotMe mory(
String dbName);
...
}

You hopefully get the idea now.

This actually might be an interesting... if somewhat time consuming...
project for a DB2 developer to take on. It's DOABLE, it's a matter of
prioritizing.
J Allen wrote:
We're currently using udb 7.2 on OS/2 and thinking about moving on to
8.1/8.2 on Windows. In presenting the benefits of such a move I have
been unable to find out if the APIs available to C in 7.2/7.2 are
available in C# in 8.1/8.2. With udb 8.2 can I back up and restore the
database (for example) natively through c#?

Nov 12 '05 #2
"Amurchis" has answered the concrete question of how to interface between C#
and C. I would like to suggest that neither C# nor C[++] are the way to go.
Code your maintenance jobs in perl - it will take a fraction of the effort,
and you can probably even pinch the basic script.

The main advantage of moving from OS/2 is that OS/2 has no future - it isn't
being developed (device drivers aside) and will lose DB2 support (DB2 7.2
was the last version). Under Windows you get functionality such as
integrated Kerberos security, LDAP catalogues, large memory support (AWE),
HADR, and advanced disk / volume management, including powerul SAN (OS/2's
LVM is rather primitive), to name a few features that actively help your
database handling.

"J Allen" <93*****@gmail. com> wrote in message
news:11******** *************@f 14g2000cwb.goog legroups.com...
We're currently using udb 7.2 on OS/2 and thinking about moving on to
8.1/8.2 on Windows. In presenting the benefits of such a move I have
been unable to find out if the APIs available to C in 7.2/7.2 are
available in C# in 8.1/8.2. With udb 8.2 can I back up and restore the
database (for example) natively through c#?

Nov 12 '05 #3

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