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grass-odbc(1grass) Grass User's Manual grass-odbc(1grass)
NAME
grass-odbc - ODBC driver
ODBC driver ODBC driver in GRASS Communication between GRASS and ODBC database for attribute management:
| GRASS module | | ODBC Interface | | RDBMS
| GRASS | DBMI driver | unixODBC | ODBC driver | PostgreSQL
| Oracle
| ...
Supported SQL commands
All SQL commands supported by ODBC.
Operators available in conditions
All SQL operators supported by ODBC.
EXAMPLE
In this example we copy the dbf file of a SHAPE map into ODBC, then connect GRASS to the ODBC DBMS. Usually the table will be already
present in the DBMS.
Configure ODBC driver for selected database (manually or with 'ODBCConfig'). ODBC drivers are defined in /etc/odbcinst.ini.
Here is example:
[PostgreSQL]
Description = ODBC for PostgreSQL
Driver = /usr/lib/libodbcpsql.so
Setup = /usr/lib/libodbcpsqlS.so
FileUsage = 1
Create DSN (data source name). The DSN is used as database name in db.* modules. Then DSN must be defined in
$HOME/.odbc.ini (for this user only) or in /etc/odbc.ini for (for all users) [watch out for the database name which appears
twice and also for the PostgreSQL protocol version]. Omit blanks at the beginning of lines:
[grass6test]
Description = PostgreSQL
Driver = PostgreSQL
Trace = No
TraceFile =
Database = grass6test
Servername = localhost
UserName = neteler
Password =
Port = 5432
Protocol = 8.0
ReadOnly = No
RowVersioning = No
ShowSystemTables = No
ShowOidColumn = No
FakeOidIndex = No
ConnSettings = Configuration of an DSN without GUI is described on http://www.unixodbc.org/odbcinst.html, but
odbc.ini and .odbc.ini may be created by the 'ODBCConfig' tool. You can easily view your DSN structure by 'DataManager'. Con-
figuration with GUI is described on http://www.unixodbc.org/doc/UserManual/
To find out about your PostgreSQL protocol, run:
psql -V
Now create a new database if not yet existing:
db.createdb driver=odbc database=grass6test
Now store the table 'mytable.dbf' (here: in current directory) into PostgreSQL through ODBC:
db.connect driver=odbc database=grass6test
db.copy from_driver=dbf from_database=./ from_table=mytable
to_driver=odbc to_database=grass6test to_table=mytable
Next link map to attribute table (now the ODBC table is used, not the dbf file):
v.db.connect map=mytable.shp table=mytable key=ID
database=grass6test driver=odbc
v.db.connect -p
Finally a test: Here we should see the table columns (if the ODBC connection works):
db.tables -p
db.columns table=mytable
Now the table name 'mytable' should appear.
Doesn't work? Check with 'isql ' if the ODBC-PostgreSQL connection is really established.
Note that you can also connect mySQL, Oracle etc. through ODBC to GRASS. You can also check the vector map itself concerning a current
link to a table:
v.db.connect -p mytable.shp
which should print the database connection through ODBC to the defined RDBMS.
SEE ALSO
db.connect, v.db.connect, unixODBC web site, SQL support in GRASS GIS
Last changed: $Date: 2011-02-07 18:59:50 +0100 (Mon, 07 Feb 2011) $
Help Index
GRASS 6.4.2 grass-odbc(1grass)