Pygrass crash when trying to drop DB table

[lrntct]

When trying to drop an existing table, PyGRASS crash.

The table is created as follow:

l_junc = Link(layer=LAYER_JUNCTION, name=KWD_SECT_JUNCTION,
                table=vect_map.name + TN_JUNCTION, key='cat')
t_junc = l_junc.table()
t_junc.create(COLS_JUNCTION)

When trying to drop the table or rewrite it:

if t_junc.exist():
    t_junc.drop(force=True)

t_junc.create(COLS_JUNCTION, overwrite=True)

It gives the following error:

Traceback (most recent call last):
  File "./v.in.swmm.py", line 196, in <module>
    sys.exit(main())
  File "./v.in.swmm.py", line 189, in main
    write_vector(output_map, drainage_network)
  File "./v.in.swmm.py", line 75, in write_vector
    t_junc.drop(force=True)
  File "/usr/lib/grass72/etc/python/grass/pygrass/vector/table.py", line 1022, in drop
    used = db_table_in_vector(self.name)
  File "/usr/lib/grass72/etc/python/grass/script/db.py", line 192, in db_table_in_vector
    for f in vector_db(vect, stderr=nuldev).values():
  File "/usr/lib/grass72/etc/python/grass/script/vector.py", line 49, in vector_db
    **args)
  File "/usr/lib/grass72/etc/python/grass/script/core.py", line 461, in read_command
    return handle_errors(returncode, stdout, args, kwargs)
  File "/usr/lib/grass72/etc/python/grass/script/core.py", line 329, in handle_errors
    returncode=returncode)
grass.exceptions.CalledModuleError: Module run None ['v.db.connect', '--q', '-g', 'map=drainage_network@kolkata', 'sep=;'] ended with error
Process ended with non-zero return code 1. See errors in the (error) output.

[lrntct]

Below is a minimum working example:

from grass.pygrass.vector import VectorTopo
from grass.pygrass.vector.table import Link

cols = [(u'cat', 'INTEGER PRIMARY KEY'),
        (u'name', 'TEXT')]

cols_j = [(u'cat', 'INTEGER PRIMARY KEY'),
          (u'junction', 'TEXT')]

with VectorTopo('drop_table_test', mode='w', tab_cols=cols) as vect_map:
    l_junc = Link(layer=1, name='link_name',
                  table=vect_map.name + 'junc', key='cat')
    t_junc = l_junc.table()
    t_junc.create(cols_j, overwrite=True)

Just run two times the script to see the error.

Dropping the table with the command line tool works correctly:

/usr/lib/grass72/scripts/db.droptable -f table=drop_table_testjunc  
Forcing ...
(Wed Nov 16 15:40:25 2016) Command finished (4 sec)

[neteler]

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[neteler]

Ticket retargeted after milestone closed

[lucadelu]

I tested the example and it is quite strange because inside the pyGRASS code is returning error, but if I run the problematic command just after there is no error...

## -- End pasted text --
WARNING: Vector map <drop_table_test> already exists and will be
         overwritten
> /home/lucadelu/compilati/grass_trunk/dist.x86_64-pc-linux-gnu/etc/python/grass/script/vector.py(49)vector_db()
-> s = read_command('v.db.connect', quiet=True, flags='g', map=map, sep=';',
(Pdb) c
WARNING: Coor file of vector map <drop_table_test@user1> is larger than it
         should be (18 bytes excess)
Building topology for vector map <drop_table_test@user1>...
Registering primitives...
---------------------------------------------------------------------------
CalledModuleError                         Traceback (most recent call last)
<ipython-input-1-0ba8b438fe5f> in <module>()
     12                   table=vect_map.name + 'junc', key='cat')
     13     t_junc = l_junc.table()
---> 14     t_junc.create(cols_j, overwrite=True)

/home/lucadelu/compilati/grass_trunk/dist.x86_64-pc-linux-gnu/etc/python/grass/pygrass/vector/table.pyc in create(self, cols, name, overwrite, cursor)
   1162         except OperationalError:  # OperationalError
   1163             if overwrite:
-> 1164                 self.drop(force=True)
   1165                 cur.execute(sql.CREATE_TAB.format(tname=newname,
   1166                                                   coldef=coldef))

/home/lucadelu/compilati/grass_trunk/dist.x86_64-pc-linux-gnu/etc/python/grass/pygrass/vector/table.pyc in drop(self, cursor, force)
   1029         cur = cursor if cursor else self.conn.cursor()
   1030         if self.exist(cursor=cur):
-> 1031             used = db_table_in_vector(self.name)
   1032             if used is not None and len(used) > 0 and not force:
   1033                 print(_("Deleting table <%s> which is attached"

/home/lucadelu/compilati/grass_trunk/dist.x86_64-pc-linux-gnu/etc/python/grass/script/db.pyc in db_table_in_vector(table, mapset)
    192     vects = list_strings('vect', mapset=mapset)
    193     for vect in vects:
--> 194         for f in vector_db(vect, stderr=nuldev).values():
    195             if not f:
    196                 continue

/home/lucadelu/compilati/grass_trunk/dist.x86_64-pc-linux-gnu/etc/python/grass/script/vector.pyc in vector_db(map, **args)
     47     """
     48     import pdb; pdb.set_trace()
---> 49     s = read_command('v.db.connect', quiet=True, flags='g', map=map, sep=';',
     50                      **args)
     51     pdb.set_trace()

/home/lucadelu/compilati/grass_trunk/dist.x86_64-pc-linux-gnu/etc/python/grass/script/core.pyc in read_command(*args, **kwargs)
    474     if _capture_stderr and returncode:
    475         sys.stderr.write(stderr)
--> 476     return handle_errors(returncode, stdout, args, kwargs)
    477 
    478 

/home/lucadelu/compilati/grass_trunk/dist.x86_64-pc-linux-gnu/etc/python/grass/script/core.pyc in handle_errors(returncode, result, args, kwargs)
    330         args = make_command(*args, **kwargs)
    331         raise CalledModuleError(module=None, code=repr(args),
--> 332                                 returncode=returncode)
    333 
    334 def start_command(prog, flags=b"", overwrite=False, quiet=False,

CalledModuleError: Module run None ['v.db.connect', '--q', '-g', 'map=drop_table_test@user1', 'sep=;'] ended with error
Process ended with non-zero return code 1. See errors in the (error) output.

In [2]: from grass.script import read_command

In [3]: s = read_command('v.db.connect', quiet=True, flags='g', map='drop_table_test@
   ...: user1', sep=';')
WARNING: Coor file of vector map <drop_table_test@user1> is larger than it
         should be (18 bytes excess)

In [4]: s
Out[4]: '1/drop_table_test;drop_table_test;cat;/home/lucadelu/grassdata/nc_spm_08_grass7/user1/sqlite/sqlite.db;sqlite\n'

[martinl]

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