NAME

       v.in.db  - Creates new vector (points) map from database table containing coordinates.

KEYWORDS

       vector, import, database, points

SYNOPSIS

       v.in.db
       v.in.db help
       v.in.db  table=name   [driver=name]    [database=name]   x=name y=name  [z=name]  key=name
       [where=sql_query]  output=name  [--overwrite]  [--verbose]  [--quiet]

   Flags:
       --overwrite
           Allow output files to overwrite existing files

       --verbose
           Verbose module output

       --quiet
           Quiet module output

   Parameters:
       table=name
           Input table name

       driver=name
           Driver name
           Options: sqlite,mysql,odbc,pg,dbf,ogr
           Default: dbf

       database=name
           Database name
           Default: $GISDBASE/$LOCATION_NAME/$MAPSET/dbf/

       x=name
           Name of column containing x coordinate

       y=name
           Name of column containing y coordinate

       z=name
           Name of column containing z coordinate

       key=name
           Name of column containing category number
           Must refer to an integer column

       where=sql_query
           WHERE conditions of SQL statement without 'where' keyword
           Example: income = 10000

       output=name
           Name for output vector map

DESCRIPTION

       v.in.db creates new vector (points) map from database table containing coordinates.

EXAMPLE

   1) Creating a map from PostgreSQL table:

       v.in.db driver=pg database="host=myserver.itc.it,dbname=mydb" \
               table=pat_stazioni x=east y=north z=quota key=id output=pat_stazioni

       If an ID column is not not present in the PostgreSQL table, a new column should be  added.
       See pg driver page for detail.

   2) Creating a map from PostGIS:
       To extract coordinate values from PostGIS, functions have to be used:
       v.in.db driver=pg database="host=myserver.itc.it,dbname=mydb" \
               table=station x="x(geom)" y="y(geom)" z="z(geom)" key=id out=meteostations

       If  an ID column is not not present in the PostgreSQL table, a new column should be added.
       See pg driver page for detail.

   3) Import of a points table (x, y, z) from DBF file to vector points map:

       #create vector map from  DBF  table  (here,  'idcol'  contains  unique  row  IDs,  'z'  is
       optional):
       #the 'database' parameter is the directory where the DBF file is stored:
       v.in.db driver=dbf database=/home/user/tables/ table=pointsfile x=x y=y z=z \
               key=idcol out=dtmpoints
       #check result:
       v.info dtmpoints
       v.info -c dtmpoints

       If  an  ID  column  is  missing  in the DBF file, it has to be added beforehand, e.g. with
       OpenOffice.  Alternatively, import the table with  db.in.ogr  into  GRASS  and  then  with
       v.in.db from the imported table (db.in.ogr optionally adds an unique ID column).

   4) Import of a points table (x, y, z) from SQLite file to vector points map:

       #create  vector  map from table in SQLITE database file (here, 'idcol' contains unique row
       IDs, 'z' is optional):
       #the 'database' parameter is the the SQLite database file with path:
       v.in.db driver=sqlite database=/home/user/tables/mysqlite.db table=pointsfile x=x y=y  z=z
       \
               key=idcol out=dtmpoints
       #check result:
       v.info dtmpoints
       v.info -c dtmpoints

       If  an  ID column is missing in the table, it has to be added beforehand with 'sqlite3' or
       db.execute.

   5) Import of a points table (x, y, z) from DBF file to vector points map for  selected  points
       only:
       The  user  can  import  only selected vector points from a table using the where parameter
       (see above for general DBF handling):

       v.in.db driver=dbf  database=/home/user/tables/ table=pointsfile x=x y=y z=z \
               key=idcol out=dtmpoints where="x NOT NULL and z > 100"

SEE ALSO

        db.execute, db.in.ogr, v.info, v.in.ogr, v.to.db,
       SQL support in GRASS GIS

AUTHOR

       Radim Blazek

       Last changed: $Date: 2011-11-08 01:42:51 -0800 (Tue, 08 Nov 2011) $

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