v.in.db

## 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
  Force overwrite of output files

### Parameters:

driver=string
  Input driver name
  Options: dbf,odbc,mysql,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 < 1000 and inhab >= 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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