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This graphic is explained in the accompanying text Select Statement and Calling the Result Set Step-by-Step Locate the document in the library structure

The result of a SELECT statement is an object of the SapDB_ResultSet class. You can use this object to call each result row in sequence, without loading the entire result set in the main memory.

 

1. Creating the Python file sample_2.py:

#

# To reference Python libraries:

# -------------------------------------------

import sys

import sapdb.sql

# Starting the session with the database instance

# -------------------------------------------

database_user = sys.argv [1]

database_user_password = sys.argv [2]

database_name = sys.argv [3]

session = sapdb.sql.connect (database_user, database_user_password, database_name)

select = """

    SELECT msgno, language, msgtext FROM messages

    WHERE msgno BETWEEN -1000 AND -1"""

#

# If the SQL method executes a SELECT statement,

# the result is an object of the SAPDB_ResultSet class.

-----------------------------------------------

cursor = session.sql (select)

#

# The next method releases the following row of the result set.

# When the last row of the result set is reached,

# the next method returns the value 'None'.

-----------------------------------------------

row = cursor.next ()

while row:

    errorcode, language, message = row

    print "%6d %s" % (errorcode, message)

    row = cursor.next ()

#

# Ending the session with the database instance

# ---------------------------------------------

session.release ()

 

2. To call the Python file sample_2.py from the command line and transfer database user MONA’s data to the Python program with the password RED and the database instance named DEMODB, specify the following:

python sample_2.py MONA RED DEMODB

 

 

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