Postgis raster driver requires a `dbname` parameter - failing to allow for `service` only datasource

[strk]

The libpq library doesn't require a dbname parameter, relying on environment variables if present or on username, or service parameter when present.

The postgisraster driver instead insists in having a dbname, failing which results in an error: "You must specify at least a db name" (at time of writing found in frmts/postgisraster/postgisrasterdataset.cpp:2489)

This ticket is to lift that restriction. See ​https://issues.qgis.org/issues/16626 for how this is a problem for clients of the tool.

[strk]

​https://issues.qgis.org/issues/16625 is also due to this limitation

[strk]

For the record, OGR with the PG driver works fine. Compare the two:

OGR:

$ ogrinfo "pg:"
INFO: Open of `pg:'
      using driver `PostgreSQL' successful.
1: points (Point)

GDA:

$ gdalinfo "pg:"
ERROR 1: You must specify at least a db name
gdalinfo failed - unable to open 'pg:'.

[strk]

Jorge, any chance you're going to take a look at this ?

[Even Rouault]

This ticket has been automatically closed because Trac is no longer used for GDAL bug tracking, since the project has migrated to GitHub. If you believe this ticket is still valid, you may file it to ​https://github.com/OSGeo/gdal/issues if it is not already reported there.