[ https://issues.apache.org/jira/browse/SIS-180?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Martin Desruisseaux updated SIS-180: ------------------------------------ Affects Version/s: (was: 0.5) > 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 > Reporter: M. Le Bihan > Assignee: M. Le Bihan > Priority: Minor > Fix For: 0.6 > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)