Example: Executing DBM Commands and Handling Errors

In this example, you use the cmd method (DBM class) and the DBMServError class from the sdb.dbm module. You execute an incorrect DBM command and handle the error.

Procedure

Create a Python script sample.py with the following contents:

Syntax Syntax

# Import Python modules
# ----------------------------
import sys
import sdb.dbm
#
# Parse call arguments
# --------------------------
dbm_operator = sys.argv [1]
dbm_operator_password = sys.argv [2]
database_name = sys.argv [3]
#
# Call the Database Manager and log on to a database
# ------------------------------------------------------
session = sdb.dbm.DBM ('', database_name, '', dbm_operator + ',' + dbm_operator_password)
# Execute incorrect DBM command
for cmd in ['db_state', 'invalid_command']:
  try:
    result = session.cmd (cmd)
# Display result
    print cmd + ': OK ', repr (result)
  except sdb.dbm.DBMServError, err:
# Display error message
    print cmd + ': ERR', err.errorCode, err.message

End of the code.

Call the Python script:
python sample.py DBADMIN SECRET DEMODB

db_state: OK 'State\nONLINE\n'

my_invalid_command: ERR -24977 Unknown DBM command "inval