MT Objectviewer May 6 20041 Python-scripted AW object-viewer and SQL-query builder MJ Tempelaar .

MT Objectviewer May 6 2004 1

Python-scripted AW object-viewer and

SQL-query builder

MJ Tempelaar

http://www.astro-wise.org

http://www.astro-wise.org/




OverviewWeb interface to visualize and access the AW Oracle database :

– Shows structure of object-tables– Shows and navigates links between object-tables to visualize the database model– Builds and executes Oracle-SQL-queries– Binds SQL-queries to object-tables– Allows users to modify script-built queries– Output formats a.o. : XML for VOtables, Ggobi

Prototype Python-scripted http-server and Web interface to visualize and access AW Oracle database via ODBC

• Takes meta-information from Oracle data-dictionaries to show structure• Takes object-table-data from ODBC connection to view SQL results.


Prototype Python-scripted http-server and Web interface to visualize and access

AW Oracle database via ODBC

• Takes meta-information from Oracle data-dictionaries to show structure

• Takes object-table-data from ODBC connection to view SQL results.


diagram

A W d at ad i c t i o n ar y

O r ac l e 9A W d at ab as e

Q u e r yfo r m atan d E xe c u t i o n

S Q L Q u e rie s :dict io n a ry ,

o bje ct - ta ble s

H TM L o u tpu tda ta ta ble

H TM L -in pu tfo rm

H TTP - s e r ve r

X M L da tao u tpu t -o pt io n

O D B C

A W o b je c tt ab l e s

H TM L o u tpu ta t tribu te ta ble

S Q L Q u e rie sfo r in pu t - s e le ct

P yt h o n - p r o g r am


Opening screen:

Access datadictionary to show Tables


Show selection from all object-tables

Activate link to view attributes


Inspectattributes in object-

table

[Data-dictionary Table-Screen dump ]


navigate links between tables




Build and execute Oracle-SQL-queries I

Types of Queries:- Generic queries on single or linked object-tables for any attribute(s)- Specific queries: e.g. position with cone search option- Queries start from main-tables

Queries may be dynamically be composed :

•By consecutive queries (invisible to user) •By user-selected links in the results of the previous query

Queries-forms may be dynamically be composed :

• By queries filling select-lists and finding limits

-


Generic query on main table: select conditions, export-format ; bitmap-links-option to fits-files

download into users program


Generic query on Main-table + one level of linked tables (“instant drill-down”)


Fields may contain table-specific data obtained from querying the table directly before writing the form , here Filter, chip, Date-obs

[Data-Table-Screen dump ]


Navigate to next query by activating a link



Build and execute Oracle-SQL-queries II

User-interaction and control:- set selective conditions (input field,

link)- select fields to be shown in results- modify previously generated query- select to download fits-files, bitmap-

images- select output-format: ao VOTable

Database-Specific matters:-SQL is Oracle9-SQL


SQL-Query may contain specific Oracle-constructs

[Data-Table-Screen dump ]

Modify SQL-queries and test on-the-fly, or download to edit off-line


generate XML output, egVOtable- output for external

applications

[Data-Table-Screen dup ]


Applications for an ODBC-based AW database viewer and SQL-querying-

device:

Suitable for: Data analysis (sourcelists, catalogs, -frames)Not yet for: Operations on pipeline-objects

Features for further development:- Forms to work on combining data-sets - Incorporating a list of specific queries- Adaptations for interoperability - Aliasing Oracle SQL queries as generic ADQL- add SOAP service

MT Objectviewer May 6 20041 Python-scripted AW object-viewer and SQL-query builder MJ Tempelaar .

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