Application Programmer's Interface
Edition 0.0.4, 2002-05-26
Copyright © 2002 Free Software Foundation
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts.
A copy of the license is included in the section entitled "GNU Free Documentation License".
The first step is to create and set up an instance of the
geasSession class, which has to be done at least once for each
process. An application can also set up multiple sessions.
With the geasSession object, a geasList instance
can be created to request a list of business object instances from the
server. This geasList object, once set up, virtually holds a number
of geasInstance objects, which represent the actual business objects.
The application can also create a new instance of any business object class,
using the geasSession.createInstance method.
The geasInstance class provides means of altering the field values
for the instance, deleting the instance, calling methods of the instance or
get instances of other business object classes that are refered to by this
instance.
| login (user, password) | Method on geasSession |
| Logs into the server. This is the base for all subsequent operations. |
| logout | Method on geasSession |
Logs out of the server. No operations are allowed until login is called
again.
|
| loggedIn | Instance Variable of geasSession |
This read-only variable is set to TRUE if we are logged into the server,
FALSE otherwise.
|
To retrieve a list of business objects of a given class, first a
geasList object has to be created. This is, initially, an empty
list that can later be filled with instances of the given class.
To populate the list with real instances, use the population methods of the
geasList object.
| createList (class) | Method on geasSession |
Creates an empty list that can hold geasInstance) objects of the
given class.
|
Transactions take place at the session level. All operations that are performed within a session while a transaction is running are part of that transaction.
Nested transactions are not supported.
There is no explicit command to start a transaction. A transaction is started implicitly when a operation is performed and no transaction is already running.
Transactions can be ended via the commit and the rollback
methods.
| commit | Method on geasSession |
| rollback | Method on geasSession |
| prefetch | Instance Variable of geasList |
This list of strings holds the names of the prefetch fields.
Once the geasList is populated, each defined field will be
retrievable for every object in the list.
However, retrieving fields that appear in the list of prefetch fields will
be much faster.
This variable must be set before calling the |
| conditions | Instance Variable of geasList |
This list holds the conditions that have to be fulfilled.
When the list is populated with the populate method, only instances
that fulfill all of the conditions will be inserted into the list.
The format in which the conditions are passed is to be defined. This variable must be set before calling the |
| sort | Instance Variable of geasList |
This list of strings holds the names of the fields that should be used
to sort the geasList.
|
| populate | Method on geasList |
Populates the list with all the objects that fulfill the conditions set in the
conditions variable and orders them using the fields listed in the
sort variable.
If the list is not empty at the time this method is called, it is cleared before it is repopulated. If an uncommitted transaction is active at the moment, nothing is changed and an exception is raised. |
These methods are useful for iterating through the list.
| firstInstance | Method on geasList |
Returns the first geasInstance of the list.
|
| nextInstance | Method on geasList |
Returns the next geasInstance of the list.
|
| insertNewInstance (class) | Method on geasList |
Creates a new instance of a business object of the given class. Returns a
geasInstance object that represents the newly created business object.
This business object can be regarded persistent as soon as the current
transaction is committed.
|
| get (fieldname) | Method on geasInstance |
Returns the content of the given field. This can be a string, a number, an
object of geasInstance class or an object of geasList class,
depending on the type of the field.
|
| put (fieldname, value) | Method on geasInstance |
| Sets the given field of the business object to value. The datatype of value must be compatible with the type of the field, otherwise an exception will be raised. |
| call (methodname) | Method on geasInstance |
| Calls a method of the business object. |
| delete | Method on geasInstance |
| Deletes the business object. The business object is not longer persistent after the next commit. |
| authentificate (session, user, auth) | Method on AuthAgent |
| Authentificate the user user with the informations stored in the auth dictionary. The function returns 'true' on success. |
| hasAccess (session, user, classname) | Method on AuthAgent |
| Return information if the user user has access to classname. |
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authentificate on AuthAgent: AuthAgent
call on geasInstance: Instance
commit on geasSession: Session
createList on geasSession: Session
delete on geasInstance: Instance
firstInstance on geasList: List
get on geasInstance: Instance
hasAccess on AuthAgent: AuthAgent
insertNewInstance on geasList: List
login on geasSession: Session
logout on geasSession: Session
nextInstance on geasList: List
populate on geasList: List
put on geasInstance: Instance
rollback on geasSession: Session