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| creator |
Gao, Jie
| | date |
2002-07-02
| | | | description |
78 pages
| |
Over years all sorts of applications are developed, used and rooted
in an enterprise. Workflow management system (WFMS) was introduced
so that a single function call at the beginning of a process will
trigger a chain of application execution. Often the results returned
from a workflow is desired to be further processed or stored in a
database. Thus the federated database concept is introduced to
integrate workflow into a database.
Wrapper and user defined function (UDF) can be applied to realise
integration of WFMS to federated database. While user defined
function (UDF) approach offers a compact solution of integrating
workflow by invoking a single function registered in the Federated
Database System (FDBS) to execute workflow, it has its structural
limitations.
In this thesis, the integration is tried with help of the wrapper
technology standardized by SQL Part 9 Management of External Data
(SQL/MED). Since integration is done in an object oriented
programming environment, SQL/MED will be projected in an object
oriented perspective. How data is channeled into workflow process as
parameter by wrapper and how the results are collected and converted
by wrapper before delivering to federated database system will be
one of the most important part of wrapper mechanism.
After the workflow wrapper is implemented, the performance issue
arises as how the structural and conceptual differences between UDF
and wrapper will affect them in efficiency as integration tools. A
test based on a simple workflow process is made and its test results
will be analysed. An opinion based on the analysis will try to be
made.
| | format |
application/pdf
| | 396375 Bytes | |