NAME

       v.db.renamecolumn   -  Renames a column in the attribute table connected to a given vector
       map.

KEYWORDS

       vector, attribute table, database

SYNOPSIS

       v.db.renamecolumn
       v.db.renamecolumn --help
       v.db.renamecolumn map=name  [layer=string]   column=oldcol,newcol   [--help]   [--verbose]
       [--quiet]  [--ui]

   Flags:
       --help
           Print usage summary

       --verbose
           Verbose module output

       --quiet
           Quiet module output

       --ui
           Force launching GUI dialog

   Parameters:
       map=name [required]
           Name of vector map
           Or data source for direct OGR access

       layer=string
           Layer number or name
           Vector  features  can have category values in different layers. This number determines
           which layer to use. When used with direct OGR access this is the layer name.
           Default: 1

       column=oldcol,newcol [required]
           Old and new name of the column (old,new)

DESCRIPTION

       v.db.renamecolumn renames a column in the attribute table connected to a given vector map.
       It automatically checks the connection for the specified layer.

NOTES

       If  the  map  table  is  connected  through  the  DBF  or  SQLite drivers, the renaming is
       internally done by adding a new column with new name, transferring the contents of the old
       column  to  the new column and dropping the old column. This is needed as DBF or SQLite do
       not support "ALTER TABLE" command to rename columns. Due to this  the  renamed  column  is
       found as last column of the table, it’s original position cannot be maintained.

       The  SQLite  driver will exit with an error if the column rename involves only a change of
       case, i.e., upper-to-lowercase,  or  lower-to-uppercase.  The  SQLite  protocol  considers
       "NAME"  and  "name"  to  be  identical  column names. In cases like these, the user should
       rename the original column to an intermediary name, then rename the  intermediary  to  the
       final name.

EXAMPLES

       Renaming a column:
       g.copy vect=roadsmajor,myroads
       v.info -c myroads
       v.db.renamecolumn myroads column=ROAD_NAME,roadname
       v.info -c myroads

SEE ALSO

        db.execute, v.db.addcolumn, v.db.addtable, v.db.connect, v.db.dropcolumn, v.db.droptable,
       v.db.select, v.db.update
       GRASS SQL interface

AUTHOR

       Markus Neteler

       Last changed: $Date: 2011-11-08 22:24:20 +0100 (Tue, 08 Nov 2011) $

       Main index | Vector index | Topics index | Keywords index | Full index

       © 2003-2016 GRASS Development Team, GRASS GIS 7.0.3 Reference Manual