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

# type_input.py (Section 6.3)

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

import cx_Oracle

import db_config

con = cx_Oracle.connect(db_config.user, db_config.pw, db_config.dsn)

cur = con.cursor()

# Create table

cur.execute("""begin

execute immediate 'drop table testgeometry';

exception when others then

if sqlcode <> -942 then

raise;

end if;

end;""")

cur.execute("""create table testgeometry (

id number(9) not null,

geometry MDSYS.SDO_GEOMETRY not null)""")

# Create a Python class for an SDO

class mySDO(object):

def __init__(self, gtype, elemInfo, ordinates):

self.gtype = gtype

self.elemInfo = elemInfo

self.ordinates = ordinates

# Get Oracle type information

objType = con.gettype("MDSYS.SDO_GEOMETRY")

elementInfoTypeObj = con.gettype("MDSYS.SDO_ELEM_INFO_ARRAY")

ordinateTypeObj = con.gettype("MDSYS.SDO_ORDINATE_ARRAY")

# Convert a Python object to MDSYS.SDO_GEOMETRY

def SDOInConverter(value):

obj = objType.newobject()

obj.SDO_GTYPE = value.gtype

obj.SDO_ELEM_INFO = elementInfoTypeObj.newobject()

obj.SDO_ELEM_INFO.extend(value.elemInfo)

obj.SDO_ORDINATES = ordinateTypeObj.newobject()

obj.SDO_ORDINATES.extend(value.ordinates)

return obj

def SDOInputTypeHandler(cursor, value, numElements):

if isinstance(value, mySDO):

return cursor.var(cx_Oracle.OBJECT, arraysize = numElements,

inconverter = SDOInConverter, typename = objType.name)

sdo = mySDO(2003, [1, 1003, 3], [1, 1, 5, 7]) # Python object

cur.inputtypehandler = SDOInputTypeHandler

cur.execute("insert into testgeometry values (:1, :2)", (1, sdo))

# Define a function to dump the contents of an Oracle object

def dumpobject(obj, prefix = " "):

if obj.type.iscollection:

print(prefix, "[")

for value in obj.aslist():

if isinstance(value, cx_Oracle.Object):

dumpobject(value, prefix + " ")

else:

print(prefix + " ", repr(value))

print(prefix, "]")

else:

print(prefix, "{")

for attr in obj.type.attributes:

value = getattr(obj, attr.name)

if isinstance(value, cx_Oracle.Object):

print(prefix + " " + attr.name + " :")

dumpobject(value, prefix + " ")

else:

print(prefix + " " + attr.name + " :", repr(value))

print(prefix, "}")

# Query the row

print("Querying row just inserted...")

cur.execute("select id, geometry from testgeometry")

for (id, obj) in cur:

print("Id: ", id)

dumpobject(obj)

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