iframe-proxy | Sunbelt Computer Software

History

71 lines (63 loc) · 2.52 KB

Raw

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

# ReturnLongs.py

# Returns all CLOB values as long strings and BLOB values as long raws. This

# is only useful if the lengths of the CLOB and BLOB values are well known but

# it can improve performance because there is no need to return to the database

# to get the actual values.

# This script requires cx_Oracle 5.0 and higher.

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

from __future__ import print_function

import cx_Oracle

import SampleEnv

def OutputTypeHandler(cursor, name, defaultType, size, precision, scale):

if defaultType == cx_Oracle.CLOB:

return cursor.var(cx_Oracle.LONG_STRING, arraysize = cursor.arraysize)

if defaultType == cx_Oracle.BLOB:

return cursor.var(cx_Oracle.LONG_BINARY, arraysize = cursor.arraysize)

connection = cx_Oracle.Connection(SampleEnv.MAIN_CONNECT_STRING)

connection.outputtypehandler = OutputTypeHandler

cursor = connection.cursor()

# add some data to the tables

print("Populating tables with data...")

cursor.execute("truncate table TestClobs")

cursor.execute("truncate table TestBlobs")

longString = ""

for i in range(10):

char = chr(ord('A') + i)

longString += char * 25000

cursor.setinputsizes(None, cx_Oracle.LONG_STRING)

cursor.execute("insert into TestClobs values (:1, :2)",

(i + 1, "STRING " + longString))

cursor.setinputsizes(None, cx_Oracle.LONG_BINARY)

cursor.execute("insert into TestBlobs values (:1, :2)",

(i + 1, longString.encode("ascii")))

connection.commit()

# fetch the data and show the results

print("CLOBS returned as longs")

cursor.execute("""

select

IntCol,

ClobCol

from TestClobs

order by IntCol""")

for intCol, value in cursor:

print("Row:", intCol, "string of length", len(value))

print()

print("BLOBS returned as longs")

cursor.execute("""

select

IntCol,

BlobCol

from TestBlobs

order by IntCol""")

for intCol, value in cursor:

print("Row:", intCol, "string of length", value and len(value) or 0)

Sunbelt Computer Software

PL/B Language Development and Support

Navigation Menu

Sunbelt Computer Software

PL/B Language Development and Support

FilesExpand file tree

ReturnLongs.py

Latest commit

History

ReturnLongs.py

File metadata and controls