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'. Configuration 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) $
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