bindexattributes.py

This is an example of index attributes use written in Python.

import sys
import struct
import math
import os
import platform
 
if (platform.system() == "Windows"):
    sys.path.append("C:\\Program Files\\Actian\\Zen\\bin")
else:
    sys.path.append("/usr/local/actianzen/lib64")
 
import btrievePython
 
min_x = 0
max_x = 255
btrieveFileName = "squaresAndSquareRoots.btr"
numberOfRecords = max_x - min_x + 1
recordFormat = "<BHd1024s"
recordLength = 11 + 1024
 
# If the incorrect number of arguments were given.
if (len(sys.argv) != 1):
    sys.exit("Usage: " + os.path.basename(sys.argv[0]))
 
btrieveClient = btrievePython.BtrieveClient()
assert(btrieveClient != None)
 
# Create file.
btrieveFileAttributes = btrievePython.BtrieveFileAttributes()
assert(btrieveFileAttributes != None)
 
rc = btrieveFileAttributes.SetFixedRecordLength(recordLength)
assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveFileAttributes::SetFixedRecordLength():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(rc))
 
rc = btrieveClient.FileCreate(btrieveFileAttributes, btrieveFileName, btrievePython.Btrieve.CREATE_MODE_OVERWRITE)
assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveClient::FileCreate():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(rc))
 
# Open file.
btrieveFile = btrievePython.BtrieveFile()
assert(btrieveFile != None)
 
rc = btrieveClient.FileOpen(btrieveFile, btrieveFileName, None, btrievePython.Btrieve.OPEN_MODE_NORMAL)
assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveClient::FileOpen():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(rc))
 
# Load file.
# For all the values of x.
for i in range(min_x, max_x + 1):
    iSquared = i * i
    iSquareRoot = math.sqrt(i)
    record = struct.pack(recordFormat, i, iSquared, iSquareRoot, bytes("The square of %d is %d and its square root is %f." % (i, iSquared, iSquareRoot), "utf-8"))
 
    rc = btrieveFile.RecordCreate(record)
    assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveFile::RecordCreate():%d:%s.\n"  % (rc, btrievePython.Btrieve_StatusCodeToString(rc))
 
# Create index.
btrieveKeySegment = btrievePython.BtrieveKeySegment()
assert(btrieveKeySegment != None)
 
 
rc = btrieveKeySegment.SetDescendingSortOrder(True)
assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveKeySegment::SetDescendingSortOrder():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(rc))
 
 
rc = btrieveKeySegment.SetField(11, btrievePython.Btrieve.MAXIMUM_KEY_LENGTH, btrievePython.Btrieve.DATA_TYPE_ZSTRING)
assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveKeySegment::SetField():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(rc))
 
 
rc = btrieveKeySegment.SetNullKeyMode(btrievePython.Btrieve.NULL_KEY_MODE_ANY_SEGMENTS)
assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveKeySegment::SetNullKeyMode():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(rc))
 
 
 
rc = btrieveKeySegment.SetNullValue(255)
assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveKeySegment::SetNullValue():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(rc))
 
 
btrieveIndexAttributes = btrievePython.BtrieveIndexAttributes()
assert(btrieveIndexAttributes != None)
 
rc = btrieveIndexAttributes.AddKeySegment(btrieveKeySegment)
assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveIndexAttributes::AddKeySegment():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(rc))
 
 
rc = btrieveIndexAttributes.SetACSName("u54-msft_enus_0")
assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveIndexAttributes::SetACSName():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(rc))
 
 
 
rc = btrieveIndexAttributes.SetDuplicateMode(btrievePython.Btrieve.DUPLICATE_MODE_ALLOWED_NONREPEATING)
assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveIndexAttributes::SetDuplicateMode():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(rc))
 
 
 
rc = btrieveIndexAttributes.SetIndex(btrievePython.Btrieve.INDEX_119)
assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveIndexAttributes::SetIndex():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(rc))
 
 
 
rc = btrieveIndexAttributes.SetModifiable(False)
assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveIndexAttributes::SetModifiable():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(rc))
 
 
rc = btrieveFile.IndexCreate(btrieveIndexAttributes)
assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveFile::IndexCreate():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(rc))
 
# Retrieve records.
record = bytes(recordLength)
 
# For all the values of x.
for i in range(min_x, max_x + 1):
    if (i == min_x):
        rc = btrieveFile.RecordRetrieveFirst(btrievePython.Btrieve.INDEX_119, record)
        assert(rc == recordLength), "Error: BtrieveFile::RecordRetrieveFirst():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(btrieveFile.GetLastStatusCode()))
    else:
 
        rc = btrieveFile.RecordRetrieveNext(record)
        assert(rc == recordLength), "Error: BtrieveFile::RecordRetrieveNext():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(btrieveFile.GetLastStatusCode()))
 
 
    i, iSquared, iSquareRoot, text = struct.unpack_from(recordFormat, record)
    print("record: ({}, {}, {}, {})".format(i, iSquared, iSquareRoot, str(text, "utf-8")))
 
 
# Close file.
rc = btrieveClient.FileClose(btrieveFile)
assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveClient::FileClose():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(rc))
 
# Delete file.
rc = btrieveClient.FileDelete(btrieveFileName)
assert(rc == btrievePython.Btrieve.STATUS_CODE_NO_ERROR), "Error: BtrieveClient::FileDelete():%d:%s.\n" % (rc, btrievePython.Btrieve_StatusCodeToString(rc))