[jira] [Updated] (SIS-180) Place a crude JDBC driver over Dbase files

["Martin Desruisseaux (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SIS-180?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martin Desruisseaux updated SIS-180:
------------------------------------
    Component/s:     (was: Storage)
                 Shapefile

> Place a crude JDBC driver over Dbase files
> ------------------------------------------
>
>                 Key: SIS-180
>                 URL: https://issues.apache.org/jira/browse/SIS-180
>             Project: Spatial Information Systems
>          Issue Type: Improvement
>          Components: Shapefile
>    Affects Versions: 0.5
>            Reporter: M. Le Bihan
>            Assignee: Martin Desruisseaux
>            Priority: Minor
>             Fix For: 0.5
>
>         Attachments: src.zip
>
>
> It would be useful to be able to query DBF content through SQL.
> But there are no free drivers available for the old _Dbase 3_ format.
> The first step is to create short implementations of _Connection_, _Statement_, _ResultSet_, _ResultSetMetadata_ interfaces for a JDBC using our _Database_ class as core binary loader at the begining.
> The main difficulty is to respond to a SQL request, and first : being able to analyze it to understand what is expected.
> The SQL request analysis is a very strong job, but I suggest to ease it a lot by relying on _AntLR_ API for grammar analysis, associated with a BNF grammar file, maybe taken from ^1^ or from elsewhere (grammars are of public domain).
> The goal of this current JIRA is only to be able to perform a 
> _SELECT * FROM <shapefile layer name>_
> The WHERE clause or the selection of fields, will come later in other JIRA.
> No transactions, classic _Statement_ only.
> _PreparedStatement_ would be also implemented later (another JIRA).
> Of course, this improvment can be discarded if an open source or free driver is discovered, that would allow us to execute SQL requests on DBase 3 easily.
> ^1^ For example, [http://www.savage.net.au/SQL/] has some BNF, but maybe elsewhere they will more compliant with AntLR.



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