RWDBDatabaseCallbackImp Class Reference

Abstract base class from which all custom database callbacks derive. More...

#include <rw/db/dbasecbi.h>

Inherits RWDBReference.

Inherited by RWDBDatabaseDefaultCallbackImp.

Public Member Functions
virtual void	connParams (const RWCString &serverName, const RWCString &userName, RWCString &password, const RWCString &databaseName, const RWCString &propertyString)
RWDBEnvironmentHandle *	environmentHandle () const
virtual void	postEnvAllocate ()
virtual void	preEnvAllocate ()
virtual void	preEnvDestroy ()
virtual RWDBConnCallback	produceConnCallback ()
RWCString	serverType () const
void	setError (RWDBStatus::ErrorCode code, const RWCString &message, const RWCString &vendorMessage1=RWCString(), const RWCString &vendorMessage2=RWCString(), long vendorError1=0, long vendorError2=0, bool isTerminal=false, bool invokeErrorHandler=true, bool invalidateDatabase=false)
RWDBStatus	status () const

Protected Member Functions
	RWDBDatabaseCallbackImp ()

Detailed Description

RWDBDatabaseCallbackImp is a reference-counted implementation class that is the abstract base class for implementing database callbacks. Derive from this class to implement your custom database callbacks.

This class provides three database callback methods: preEnvAllocate(), postEnvAllocate() and preEnvDestroy(). It also provides a connection callback producer method produceConnCallback(). Please refer to the DB Interface Module User's Guide and applicable DB Access Module User's Guide for more information on these methods. You need to redefine the methods to implement database callbacks and/or produce connection callback instances.

Synopsis

#include <rw/db/dbasecbi.h>

class MyDBaseCallbackImp : public RWDBDatabaseCallbackImp {
public:
    // PostEnvAllocate callback
    virtual void postEnvAllocate();

    // Connection callback producer
    virtual RWDBConnCallback produceConnCallback();
};

RWDBDatabase dBase =
  RWDBManager::database("accessLib", "Servername",
                        "Username", "Password",
                        "DatabaseName",
             RWDBDATABASECALLBACK(MyDBaseCallbackImp) );

Constructor & Destructor Documentation

RWDBDatabaseCallbackImp::RWDBDatabaseCallbackImp ( )

inlineprotected

The default protected constructor.

Member Function Documentation

virtual void RWDBDatabaseCallbackImp::connParams ( const RWCString &  serverName, const RWCString &  userName, RWCString &  password, const RWCString &  databaseName, const RWCString &  propertyString  )

virtual

This callback is invoked just before opening a connection to the database. It passes to the callback function the parameters used to establish a database connection. All the parameters, except password, are passed as const and so cannot be modified. The password set during this call will be used to open a connection to the database. To implement connParams() callback, derive from this class and redefine this method.

RWDBEnvironmentHandle* RWDBDatabaseCallbackImp::environmentHandle

(

)

const

Returns a pointer to the RWDBEnvironmentHandle of the RWDBDatabase object to which self is associated. If self is not associated with any RWDBDatabase object, returns 0.

virtual void RWDBDatabaseCallbackImp::postEnvAllocate ( )

virtual

This callback is invoked after the allocation of database-specific-environment/context handle. It is defined as a no-op. To implement postEnvAllocate callback, derive from this class and redefine this method.

virtual void RWDBDatabaseCallbackImp::preEnvAllocate ( )

virtual

This callback is invoked just before the allocation of database-specific environment/context handle. It is defined as a no-op. To implement preEnvAllocate callback, derive from this class and redefine this method.

virtual void RWDBDatabaseCallbackImp::preEnvDestroy ( )

virtual

This callback is invoked just before the deallocation of environment/context handle. It is defined as a no-op. To implement preEnvDestroy callback, derive from this class and redefine this method. This callback is typically called from the destructor of the RWDBDatabase object and, hence, applications should refrain from throwing an exception.

virtual RWDBConnCallback RWDBDatabaseCallbackImp::produceConnCallback ( )

virtual

This method must produce a new instance of a connection callback implementation.

An RWDBDatabase object invokes this method when producing a new RWDBConnection object. The RWDBConnCallback object produced by this method is then associated with the new RWDBConnection.

Note that this method produces an uninitialized connection callback object with all connection callbacks as no-ops. To produce custom connection callbacks, derive from this class and redefine this method to produce new instances of connection callbacks using the macro RWDBCONNCALLBACK(CALLBACK).

For example:

RWDBConnCallback
MyDBaseCallbackImp::produceConnCallback()
{
    return RWDBCONNCALLBACK(MyConnCallbackImp);
}

RWCString RWDBDatabaseCallbackImp::serverType

(

)

const

Returns the serverType of the RWDBDatabase object to which self is associated. If self is not associated with any RWDBDatabase object, returns an empty string.

void RWDBDatabaseCallbackImp::setError	(	RWDBStatus::ErrorCode	code,
		const RWCString &	message,
		const RWCString &	vendorMessage1 = RWCString(),
		const RWCString &	vendorMessage2 = RWCString(),
		long	vendorError1 = 0,
		long	vendorError2 = 0,
		bool	isTerminal = false,
		bool	invokeErrorHandler = true,
		bool	invalidateDatabase = false
	)

Sets an error on self. Optionally, invalidates the RWDBDatabase object to which self is associated.

Parameters

code	RWDBStatus attribute used to set the error on self's RWDBStatus object.
message	RWDBStatus attribute used to set the error on self's RWDBStatus object.
vendorMessage1	RWDBStatus attribute used to set the error on self's RWDBStatus object.
vendorMessage2	RWDBStatus attribute used to set the error on self's RWDBStatus object.
vendorError1	RWDBStatus attribute used to set the error on self's RWDBStatus object.
vendorError2	RWDBStatus attribute used to set the error on self's RWDBStatus object.
isTerminal	RWDBStatus attribute used to set the error on self's RWDBStatus object.
invokeErrorHandler	Indicates if the associated error handler should be invoked.
invalidateDatabase	Indicates if the RWDBDatabase object to which self is associated should be invalidated. If invalidated, the RWDBDatabase object has an error code of RWDBStatus::applicationError.

RWDBStatus RWDBDatabaseCallbackImp::status ( ) const

inline

Returns the current status of self.