Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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ACCESSING DATABASES
Field of the Invention
The present invention relates to accessing relational database
systems from remote terminals.
Background of the Invention
Distributed data access systems are known that require a central
authority responsible for defining a rigid set of conventions, known as a
global schema, to control the way in which data is structured and represented
at the various sites that make up the system. The existence of the global
schema restricts the autonomy of the local sites and results in rigidity and
delay with regard to when and how data is stored and accessed.
A . simple database system which may be accessed remotely is
described in~GB 1581136, which describes an information handling system
and terminal apparatus. Information may be displayed as an index and
selections may be made by operators by operation of a keypad to indicate
which item of a displayed index is required.
The system effectively describes an arrangement of linked flat pages
where a selection made on the top level page will result in a lower level page
being supplied to a user.
The database structure of this type only allows pre-stored information
to be supplied to users.
The present invention is direcfed towards the problem of accessing ,.
central relational database systems, where database specific commands are
required to be activated in response to local selections. These types of
commands may involve complex filtering combining and displaying
commands so as to derive optimum benefit from relational databases
containing a plurality of tables. In the aforesaid known system, no provision
is
made for activating commands of this type, given that all data supplied to
users is predefined. Such an arrangement would therefore have serious
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limitations and access is to be provided to relational databases. .
When users are given direct access to relational databases, highly
sophisticated commands, usually defined using Standard Query Language
(SQL) may be directed at the database. These may cause undesirable
operations to be effected upon the database which may corrupt data or, more
likely, may consume signincant amounts of processing time as re-indexing
operations are performed. It is therefore desirable to provide the power of
relational database environments while at the same time providing a level of
restriction upon the extent to which some users may be given access to certain
procedural systems.
Summary cf the Invention . .
According to a first aspect of the present invention, there is provided a
method of producing output data from a database system in response to
instructions from distributed user terminals, said method comprising steps of
establishing a communications channel between a user terminal and said
database system, wherein said database system includes a plurality of
independent databases having a plurality of database schemas; supplying data
from said database system to said connected user terminal to identify
available
relational data queries corresponding to pre-determined data mappings between
said independent databases; returning data to said database system identifying
a selected relational data query from said available selection; and
implementing
said selected query to produce output data from said database system.
tn a preferred embcdiment, database specinc instructions are donned
in accordance with Standard Query Language (SQL) instructions at~d said
SQL may be generated by the execution of a predefined script.
Preferably, a user interface environment is established in response to
commands returned from the remote database and the remote database may
supply indicaticns cf avaifeble quantifiable values.
According to a second aspect of the present invention, a database system
is configured to produce output data in response to instructions from
distributed
user terminals, said system comprising a plurality of independent databases
having a plurality of database schemas; means for establishing a communication
channel with a user terminal; means for supplying data to said connected user
terminal to ,identify available relational data queries corresponding to
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pre-determined data mappings between said independent databases; means for
receiving data identifying a selected relational data query from said
available
selection; and means for implementing said selected query to produce output
data from the database system.
Brief Description of the Drawings
Figure 1 is a diagrammatic representation of the international
distributicn network known as the wcrld wide web, forming part ef the
intemet; having Iecal user sites and remote databases connected thereto;
Figure 2 details a remote database of the type shown in Figure 1,
having a database computer and a nefiwork access computer;
Figures 3A, 3B, 3C and 3D illustrate database tables of the type
stored on the database corriputer shown in Figure 2;
Figure 4 details equipment contained within the database computer
r
shown in Figure 2 and illustrates processes executed by said computer;
Figure 5 illustrates procedures executed by the equipment shown in
Figure 4;
Figure 6 illustrates an accessing computer of the type shown in Figure
1, including a processcr for executing application programs received from the
nefiNCr'~c and a monitcr for displaying infcrnaticn in response to these
application programs;
Figure 7 illustrates a graphical user interface displayed by the display
device shown in Figure 5, including fields for specifying data requests and
fields for displaying information received from the remcte database;
Figures Sa and 8b illustrate displays arranged to recsive user
instruc;iens as shown in Figure 7 and
Figure 9 illustrates the data display idec~tified in Figure 7.
Detailed pescription of the Preferred Embodiment
International data communication is provided by the world wide web,
illustrated diagrammatically as region 101 in Figure 1. Access to this
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is provided over data channels 102, that are in turn connected to service
nodes 103. The service nodes 103 allow users to gain access to the world
wide web, and other Internet facilities, with varying levels of transmission
bandwidth.
In accordance with established protocols, messages are addressed so
as to identify a particular destination point by means of data defining a
uniform resource location (URL). URLs of this type may be generated
manually by an operator, or, alternatively they may be generated
automatically as programs are executed.
Under the world wide web, pages of data are supplied to users in a
structured form, specified using "hyper-text mark-up language" (HTML) and
servers of this type are identified as operating in accordance with "hyper-
text
T
transport protocol" (HTTP). Thus, in accordance with established world wide
web operation, it is possible for a local user to obtain information from a
displaced site by issuing a URL over the world wide web. In response to
receiving a URL, an HTTP server may issue a formatted HTML page to the
requesting user, thereby allowing information to be displayed to the user in a
structured way. Furthermore, in addition to data of this type being supplied
to
users, it is also possible for executable programs to be supplied to users,
identified as "common gateway interface binary" programs (CGI.BIN
programs) so as to further enhance the functionality of the interactive world
wide web environment.
A recent development has extended the functionality of world wide
web connections using CGI.BIN type programs. A proprietary system is
available.from SUN Microsystems licensed under the trademark "JAVA". In
accordance with this environment,,it is possible for JAVA code to be supplied
to local requesting users in a form that is executable on the local station so
as to provide an operational environment, similar to that provided by an
applications program, without requiring local users to obtain application
instructions from independent sources. Thus, it is possible for local users to
be given enhanced functionality similar to that provided by an applications
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program, without being required to load local programs, possibly from floppy
disks etc., given that these programs are effectively provided over the
network connection.
A session may be initiated by a local user requesting access to a
remote station, whereafter, embedded within an HTML page, JAVA code is
supplied back to the requesting user such that an application program is
effectively loaded into local memory. The user may then interact with that
application, allowing transactions to be made over the network, effectively
under the control of the remote station. A platform of this type is used
within
the present embodiment in order to provide remote access to databases and
to allow database queries to be made.
Standard query language is widely used, usually referred to as SQL,
configured to allow queries to be made to many different proprietary
database systems. Predominantly, these consist of relational databases but
similar techniques may be employed with flat filE databases and object
orientated databases etc. Usually, a database in combination with a terminal
or terminals for providing access to said database, would be considered as
an isolated self contained system, where the data volume and the type of
enquiries that can be made to that volume remain substantially constant.
Networks of databases of this type are known, but in existing systems it is
necessary to construct such databases from common starting points so as to
ensure compatibility between the remote locations. In the art, such an
approach is known as a global schema.
If a schema has not been adopted for the development of independent
databases, it is very difficult to combine data accessed from different
locations. Thus, in existing systems, it may be necessary to effectively re
format data obtained from one database for its application to a second
database or, alternatively, it may be possible for experienced programmers to
develop bespoke SQL enquiries thereby facilitating the integration of the
databases to some extent. Clearly, it can be appreciated, that the
development of systems of this type requires a substantial level of expertise
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of the database itself and access to it become several layers removed from
executives and managers who may require queries to be implemented such
that commercial decisions may be effected. Thus, in many situations,
although data required by a particular manager may effectively have been
recorded in a database or a collection of databases, the process of actually
gaining access to the data and collating the data becomes a major exercise.
The present invention provides a technical process for facilitating an
interaction with databases such that much of the technical burden is taken by
the machines constituting the network, thereby allowing managers and
executives to gain easy access to a consistent, substantially intuitive
platform.
In the present embodiment, in accordance with the present invention,
database systems include database specific commands contained as sets of
commands or program files which may be stored at the remote databases or
constructed at said remote database when required. The essential feature of
databases is that they facilitate data mappings such that data of a first type
may be associated with data of a second type. For example, a customer may
be identified with a unique customer identification. This would often make up
the primary key in database systems such that all associated data within a
particular table would be indexed to this key; given the identification number
other data can be retrieved extremely quickly without performing resource-
demanding searches.
Associated with this entry, other data may be included, such as a
customer's name, address, post code, number of telephone lines, equipment
requirements, customer age, date of installation and so on. Similarly, another
table or another database mad include on-going account information
associating the customer's identification with financial details relating to
the
customer's account. Thus, in this second table, fields may exist identifying
the
amount of the customer's last bill, the extent of any discounts given to that
customer, a credit rating for that customer, an indication of the customers
history of bill payments and so on.
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l-he customer identification is unique and by aligning customer
identification with customer name on the first table, it is possible to relate
this
to a second table that maps customer identification to financial details.
Thus,
a relational link may be provided between customer names and amount
outstanding, although this actual mapping does not exist in any one table.
This approach forms the basis for relational databases.
In accordance with the present invention, each remote database
contains a directory identifying particular mappings that may be provided by
that database. A user may wish to relate data of type A to data of type C. The
database may be capable of mapping data of type A to data of type B. In
addition, another database may be capable of mapping data of type B to data
of type C. Thus, by combining these two mappings, it is possible for a user to
obtain the type of mapping Ithat is required, ie. a mapping data of type A to
data of type C, via the facility of an intermediate mapping using data of type
B.
In addition to providing an indication of the type of mappings that are
available within a database, the database also includes mechanisms for
activating database specific commands so that the data may be examined as
required by a user. The user is now capable, from a local station, of making
effective database enquiries at the remote database, without requiring
detailed information concerning the way in which SQL enquiries must be
configured for that particular database. A communication channel is
established between the use's terminal and the database system. In the
preferred embodiment, this consists' of the terminal issuing a URL to the
database system, which in turn results in JAVA code being supplied back to
the user which, when executed at the user's terminal, results in an
application-type environment being provided to the user so as to facilitate
further interaction with the remote database system.
Within this environment, the user is encouraged to select a data
mapping and once selected, an indication of this mapping is supplied to the
remote database. In the embodiment, the user's environment has been
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provided by JAVA instructions, therefore the data sent back to the remote
database will again be in a form consistent with the known JAVA protocols.
These protocols identify specific program files within the remote database
which, in the present embodiment, are defined under the interactive language
PERL. When selected, a PERL program is executed, resulting in the
generation of an SQL enquiry specific to the particular database concerned.
Alternatively, SQL enquiries may be stored and selected as required. In
either event, the process involves the activation of a database specific
command at the database systems, in response to user selection, resulting in
appropriate information being supplied back to the local requesting users.
An Oracle relational database is retained on a database computer 110
and access to this database computer is provided via a remote network
computer 111 having a corinection to the world wide web 101. A local user
terminal 112 is connected to the world wide Web 101 and is thereby given
access to the remote database computer 110.
The remote network computer 111 executes program instructions
licensed by Sun Microsystems Inc. under the trademark "JAVA". JAVA code
is embedded within HTML pages supplied to the local user terminal 112 so
as to effectively provide an application program to the local terminal
allowing
it to gain access to the remote database 110. Thus, the extent to which local
users may gain access to the remote database is constrained to operations
that are facilitated within the JAVA environment. In this way, database
suppliers retain a level of control as to how users may exploit the
information
available from their database.
The remote site, consisting of computers 110 and 111 is shown in
Figure 2. Computer 110 essentially provides a conventional database
environment allowing direct connection of associated terminals 201, 202, 203
etc. The database retained on database computer 110 is a relational
database, comprising a plurality data tables of the type illustrated in
Figures
3A, 3B, 3C and 3D.
As is well known in the art, many different types of data may be
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retained within relational databases and they have been found particularly
useful for holding information relating to customers and suppliers for
example, where the type of information required concerning each customer
tends to be substantially similar. It, is also possible for computer 110 to
gain
access to other computers using proprietary Oracle protocols, thereby
effectively extending the range of tables that may be considered within the
relational environment.
In the present example, it is assumed that a telecommunications
organisation has recently invested in a promotional campaign in an attempt
to increase network usage. Although a national campaign, the degree of
marketing expenditure has been considered on a regional basis and a
database has been created, illustrated in Figure 3A, in which figures for
advertising costs displayed in column 301, have been mapped against
geographical regions identified in column 302. This database has been
created as a result of the promotional campaign and retains a record of levels
of expenditure, made on a region by region basis. The database also
includes basic arithmetic functions, similar to those provided within
conventional spreadsheet environments, allowing columns of figures to
summed, thereby effectively providing totals of costs over a plurality of
geographical regions.
The information retained in the database table shown in Figure 3A has
its uses, but significantly more benefit may be gained from this information
if it
can be related to customer sales, thereby effectively demonstrating the
effectiveness of the marketing campaign.
A second database retains information relating to product sales and a
third database includes information relating to customers. A table for
recording product sales is illustrated in Figure 3B. When a sale is made, a
customer identification is entered in column 303, followed by the value for
the
sale being added in column 304 and a product identification being placed in
column 305. A table of this type may be constructed over a pre-determined
time duration, thereby the total values accrued in column 304 gives a figure
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for the total sales made during that period. However, each sale in the table
is
only mapped against a customer identification and a product identification,
therefore, it is not possible, using this table, to divide sales on a regional
basis.
5 A third database contains information relating to customers and a
table from this database is illustrated in Figure 3C. For each customer,
identified by the customer's identification number in column 306, an address
is specified in column 307, including a city in column 308 and a customer
type (business or private) in column 309. In order for customers to be
10 considered on a regional basis, this database includes a second table,
illustrated in Figure 3D in which each city is entered in a column 310 with
its
corresponding geographical region specified in column 311.
From the table shown in figure 3B, it is possible to derive sales values
on a customer by customer basis. This table may then be related to that
shown in Figure 3C allowing the customer-by-customer based figures to be
converted to city-by-city based figures. Similarly, this data may then be
related to the table shown in Figure 3D so as to show total sales on a region-
by-region basis. Thus, by relating the tables shown in Figures 3B, 3C and 3D,
a mapping of total sales on a region by region basis may be derived, which
could then be compared to advertising costs derived from the data shown in
table 3A, that is also recorded on a region-by-region basis.
Enquiries for relating the information contained in tables 3B, 3C and
3D are well known in the art and are generally constructed using the SQL
language. However, the extent to which this language may be used within a
particular environment depends upon the structure of the data contained
within that environment. In known systems, it would not be possible for local
users to gain access to remote 'databases unless they had an in depth
knowledge of the database structure. However, in the present embodiment,
remote access is achieved by effectively inviting a local user to make
requests within an environment defined by the remote system.
To initiate a session, a local user issues a URL from their local user
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terminal 112 to the remote network computer 111, via the local user terminal
112. The URL is received by the remote network computer 111 and
processed to provide access to the remote database computer 110.
Operational functionality of the remote network computer 111 and the remote
database computer 110 are illustrated in Figure 4. A session initiating URL is
received by an HTT'P interpreter 401, which in turn relays a request to a
JAVA interpreter 402. The JAVA interpreter 402 determines whether the
requesting user may be given access to the system and once so determined,
HTML pages are returned to the HTTP interpreter 401 having executable
code (in the form of CIG.BIN programs) embedded therein. The HTTP
interpreter 401 dynamically assembles appropriate HTML pages and directs
these via the world wide web 101 to the requesting local user via their
respective terminal, such as local terminal 112.
At the local terminal the HTML page is received and the JAVA codes
embedded within the HTML pages are effectively loaded into the local
memory of the local user terminal for local execution therein, in a way
substantially similar to that performed when local application programs are
executed. The execution of this JAVA code results in a graphical user
interface being displayed at the local user terminal 112 in a form which
allows
the local user to access the remote database and to perform operations upon
said database. However, the environment does not allow a user to supply
SQL or similar enquiries. The environment allows particular types of
operations to be performed on the basis that enquiry programs are already
available to the remote site. Thus, the graphical user interface supported by
the JAVA code effectively allows a user to select pre-defined SQL
instructions such that all actual enquiries to the database are made using
SQL enquiries held under the control of the remote database station.
A local user interacts with the graphical user interface defined by the
JAVA code resulting in further URLs being supplied to the HTTP interpreter
401 via the world wide web 101. At the HTTP interpreter 401 the embedded
JAVA instructions are derived that are, in turn, supplied to the JAVA
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interpreter 402. The JAVA interpreter 402 communicates via an ethernet link
403, with a JAVA interface module 404 executed by the database computer
110. Thus, the graphical user interface provided for local users is initially
created under instructions derived exclusively from the remote network
computer 111. In a network including a plurality of database computers, their
associated remote network computer will be substantially similar to computer
111 and provide substantially similar graphical user interfaces. Thus,
initially,
the graphical user interface merely provides a "desktop" upon which specific
database-related values and dimensions may be manipulated.
In order for the data contained within the remote database to be
manipulated under the control of the local access, it is necessary for local
user terminals to be provided with an indication of the nature of the data
that
is available within the rerriote database. The database computer 110 is
therefore provided with a networking store 405 containing database meta-
data, that is data about the data contained within the database. Thus, when a
connection is first established between the JAVA interpreter 402 and the
JAVA interface 404, in response to a local user request, information from the
networking store 405 is supplied to the JAVA interface and relayed to the
JAVA interpreter 402. The JAVA interpreter 402 packages the information for
embedding within ~n HTML page and the construction of the HTML page is
made under the control of the HTTP interpreter (or Daemon) 401. The HTTP
Daemon 401 supplies the HTML page to the local terminal via the world wide
web so that, when received, the JAVA code is identified and used to provide
the user with a graphical representation of the data derived from the
networking store 405, representing the structure of the actual data contained
within the database. The data contained within the database 406 may be
considered as being contained in the form of tables.
After the meta-data from the networking store 405 has been supplied
to a local user and displayed within the graphical user interface, it is then
possible for the local user to perform operations upon the remote database.
All operations performable upon the data contained with the database 406
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are specified by respective enquiry programs defined using the language
PERL. The PERL programs are stored within a PERL program store 408 and
a selected PERL program is supplied to a PERL interpreter 409 that is
arranged to execute the PERL instructions and thereby generate SQL
queries. In this way, it is possible to define enquiries in a platform
independent way with appropriate PERL interpreters being provided so as to
generate SQL instructions in a form that is appropriate for the particular
platform being used.
SQL instructions generated by the PERL interpreter 409 are supplied
to an SQL processor 410 arranged to execute the SQL instructions and
thereby perform operations upon the database 406. As requests are made by
the local user, SQL instructions will be executed by the SQL processor 410
S
resulting in particular mappings of data entries being examined within the
database 406. In order that meaningful data may be returned back to the
requesting local user, the system maintains a record of the actual mappings
that have been requested and this list of mappings is retained within a
mapping store 408.
Operations executed within the environment shown in Figure 4 are
illustrated in Figure 5. The HTTP interpreter 401 is configured to continually
examine an Internet port in order to detect the arrival of a URL. A question
is
asked at step 501 as to whether a URL has been received and if answered in
the affirmative a question is asked at step 502 as to whether the URL in
valid.
If either of the questions asked at steps 501 and 502 are answered in the
negative, control is returned to step 501 and the system continues to wait for
received URLs.
If the question asked at step 502 is answered in the affirmative, to the
efFect that a valid URL has been received, embedded JAVA code is supplied
back to the requesting user effectively supplying the JAVA platform to the
user, as identified at step 503. This JAVA platform is generated by the JAVA
interpreter 402, whereafter a connection to the database computer 110 is
established over the ethernet 403.
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Thereafter, as identified at step 504, the database meta-data is
supplied to the user from the networking store 405 illustrated by link 411 in
Figure 4. Upon receive the meta-data, the local user is now in a position to
make the database requests supplied to the network computer via
appropriate URLs. At step 505 the system waits for database instructions and
asks a question as to whether a database instruction has been received. If
answered in the affirmative, a question is asked at step 506 as to whether the
instruction is valid and if either of the questions asked at step 505 or step
506
is answered in the negative, control is returned to step 505.
If a valid database instruction is identified at step 506, a PERL
program from the PERL program store 408 is selected at step 507 and at
step 508 the selected PERL program is executed by the PERL interpreter
409 to generate an SQL enquiry.
The SQL enquiry is processed by the SQL processor 410 and as new
mappings are defined, the mapping store 408 is updated at step 509.
At step 510 the SQL enquiry is executed by the SQL processor 410
and database results are returned, via the SQL processor 410 to the JAVA
interface 404, indicated by link 412 in Figure 4.
The results from the database enquiry are supplied over the ethernet
403 to the JAVP~ interpreter 402 and are then supplied to the HlTP
interpreter 401, resulting in an HTML page being issued at step 512.
Thereafter, control is returned to step 505 in anticipation of further
database
instructions being received.
A local user terminal 112 is detailed in Figure 6. The user terminal,
typically comprising a SUN work station, has a processor 601, a monitor 602,
a keyboard 603 and a mouse 604. The processor 601 accesses the world
wide web via modem 605. When a connection is established to the remote
database, JAVA code is returned to the processor 601 via the modem 605,
resulting in a graphical user interface 606 being displayed on the monitor
602. The user communicates via the graphical user interface by operation of
the mouse 604. Conventional techniques of dragging, clicking and selecting
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soft buttons result in the generation of appropriate URLs generated in
response to the meta-data received from the mapping store 408.
The information contained in the database, as illustrated by the tables
shown in Figures 3A, 3B, 3C and 3D may be considered as representing
names of quantifiable values. The environment provided by the graphical
user interface 606 effectively allows particular types of queries to be
executed upon the remote database. By restraining the number of operations
that can be performed on the database, the actual steps involved by an
operator in order to gain access are substantially simplified and made much
more intuitive.
The actual query programs are generated at the remote platform and
an environment is created, via the world wide web, allowing different
s
databases to be accessed in a similar way. Furthermore, links to databases
may be established, particularly via the URL mechanism, implementing a
stored program at the remote location, such that the access to data is
effectively extended outside the local data environment. This may be likened
to making a comparison between standard flat text files and files containing
hyper-links to other files accessible via a wide area network. Thus, in the
same way as files with links have been referred to as "hyper-text" a database
environment with links to other databases, presented in a substantially
transparent way as provided by the present embodiment, may be referred to
as "hyper-data".
The graphical user interface 606 is detailed in Figure 7. Clearly the
exact nature of the graphical user interface will change as operations are
perform and it should be understood that the representation shown in Figure
7 reflects an example of an interaction with the database; although similar
interactions would take on a similar topology within the graphical user
interface (GUI) environment.
The environment itself allows queries to be made to remote databases
in situations where a quantifiable value is to be examined. Thus, referring to
the example described previously, quantifiable values of this type include the
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advertising expenditure and the associated product sales. Within the user
interface as shown in Figure 7, accessible quantifiable values are displayed
in a value display region 701. The actual values displayed will depend upon
the nature of the information available from the database.
The nature of databases is such that values are accumulated for a
very large number of specific entries. Thus, as illustrated in Figure 3B, the
total sales recorded in column 304 results from the summation of a very large
number of individual sales identified by specific customer identifications, as
listed in column 303. Thus, it is possible to consider unit sales on a
customer
by customer basis. Alternatively, by relating to the table illustrated in
Figure
3C, it is possible to consider the sales information on a city by city basis.
Similarly, with further relation to the table illustrated in Figure 3D, it is
possible
to consider the sales values on a region by region basis. These different
ways of identifying what is essentially the same data, are referred to as
dimensions. Thus, the value of sales may be considered within the dimension
of customers, within the dimension of cities or within the dimension of
regions. The available dimensions are illustrated in a dimension display
region 702. The results obtained from viewing a selected value within a
selected dimension are displayed within a data grid 703. The GUI is
completed by a plurality of soft buttons 704, 705 and 706.
The value display region 701 is detailed in Figure 8A for a typical
session involving the data identified in Figures 3A, 3B, 3C and 3D. From this
data, it is possible to examine values for expenditure and for sales. These
values may be identified by a single mouse click and a double mouse click is
used to effect queries in relation to the particular selected values. In
Figure
8A it is possible to select the , expenditure value identified at 801 or,
alternatively, to select the sales value indicated at 802. In the Figure, a
box
803 is shown around the sales value 802, indicating that the sales value has
been selected by a double mouse click.
The dimension display region 702 is detailed in Figure 8B. In response
to the sales value 802 being selected, the sales value is displayed in the
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CA 02235320 1998-04-17
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dimension display region within a value box 804. Extending from this box
three available dimensions are displayed consisting of the customer
dimension displayed in a box 805, the city dimension displayed in a box 806
and the region dimension displayed within a box 807. The operator, in this
example, is interested in viewing sales on a region by region basis, so that
these regional sales may be compared against regional advertising
expenditure. The operator therefore moves the displayed cursor, shown as
arrow 808, over box 807 and effects a double mouse click, thereby selecting
this dimension. In Figure 8B the selection of dimension 807 has bean
identified by the outer box 809 positioned around the inner box 807.
After selecting the region dimension by double clicking on box 809 a
query, represented in accordance with the JAVA protocol, is supplied to the
remote database resulting in SQL queries being generated and indications
supplied to the mapping store 408 identifying a selection of the sales value
and the region dimension. After selecting the sales value, a figure
representing the total sales is derived from the database and returned to the
local user such that the information is displayed in display box 901 of the
data
grid shown in Figure 9. In addition, the selected value name "Sales" is
displayed at 902 beneath the value box 901.
Upon selecting the dimension for geographical region, data is supplied
to the remote database resulting in an SQL query being generated from
information read from the mapping store 408. Thus, information received
from the user identifies the dimension "Region" with the value "Sales" being
derived from the mapping store 408: This results in a suitable SQL enquiry
being generated such that sales values are obtained on a region by region
basis. In the data grid shown in Figure 9, an empty value 903 is displayed
given that the dimension does not have numerical value, and beneath this
box an identification of the dimension "Region" is displayed at 904. Beneath
this the particular region names are displayed as "NW", "NE", "N", "W" and
"SE". Furthermore, the sales total is then broken down to individual values
905 which are shown underneath the legend "Sales" mapped onto the
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geographical region identifications displayed under the legend "Region".
Thus, in response to simple manual operations within the value
display region and the dimension display region, the database has been
interrogated in order to provide dimension data showing sales on a region by
region basis. In the example shown in Figure 9, the total sales expenditure,
displayed in a value box 906, has also been broken down on a region by
region basis with data derived from another database connected to the
network. This data is obtained by selecting the "Expenditure" value displayed
in the value display region 701. Again a further selection is made for the
dimension region, resulting in the required mapping of advertising
expenditure to resulting sales on a region by region basis.
5
r
AMENDED SHE~'~
