[GRASS-dev] [GRASS GIS] #3490: pygrass: improve error messages for table handling

GRASS GIS trac at osgeo.org
Tue Feb 6 01:30:30 PST 2018

#3490: pygrass: improve error messages for table handling
 Reporter:  sbl                    |      Owner:  grass-dev@…
     Type:  defect                 |     Status:  new
 Priority:  normal                 |  Milestone:
Component:  Python                 |    Version:  unspecified
 Keywords:  pygrass,vector,SQLite  |        CPU:  All
 Platform:  All                    |
 When I try to create a new vector map in pygrass where columns in the
 attribute table (SQLite) contain "." (e.g. "landsatIm.5")
 new.open() fails saying first that table exisits and then that it does not

 Traceback (most recent call last):
 line 329, in <module>
 line 272, in main
     new.open('w', tab_name=endmembers, tab_cols=cols)
 line 381, in open
     self.n_lines = self.table.n_rows()
 line 1053, in n_rows
     cur.execute(sql.SELECT.format(cols='Count(*)', tname=self.name))
 sqlite3.OperationalError: no such table: test_end

 However, after a bit of troubleshooting, I realized that the dots were
 causing the issue.
 Would be helpful if pygrass could check for "GRASS compliant" column names
 and give more specific error messages. An alternative could be to support
 quoted identifiers throughout the code, but that is probably a too big
 effort (or something for GRASS 8?)...

Ticket URL: <https://trac.osgeo.org/grass/ticket/3490>
GRASS GIS <https://grass.osgeo.org>

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