v.in.db(1)

NAME
v.in.db - Create new vector (points) from database table containing coordinates.

KEYWORDS
vector, import

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

  Flags:

--overwrite

  Parameters:

driver=string
    Input driver name Options: dbf,pg,ogr

database=string
    Input database name

table=string
    Input table name

x=string
    x column name

y=string
    y column name

z=string
    z column name

key=string
    category column name

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.

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

AUTHOR
Radim Blazek

Last changed: $Date: 2007/07/16 09:49:30 $

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