ODBC driver in GRASS

Supported SQL commands

Operators available in conditions

EXAMPLE

• 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 <databasename>' if the ODBC-PostgreSQL connection is really established.

v.db.connect -p mytable.shp

SEE ALSO

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