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#------------------------------------------------------------------------------
# Copyright (c) 2020, 2022, Oracle and/or its affiliates.
#
# This software is dual-licensed to you under the Universal Permissive License
# (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl and Apache License
# 2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose
# either license.
#
# If you elect to accept the software under the Apache License, Version 2.0,
# the following applies:
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#------------------------------------------------------------------------------
#------------------------------------------------------------------------------
# json_direct.py
#
# Demonstrates the use of some JSON features with the JSON type that is
# available in Oracle Database 21c and higher.
#
# See https://www.oracle.com/pls/topic/lookup?ctx=dblatest&id=ADJSN
#
# For JSON with older databases see json_blob.py
#
# Note: To use the JSON type in python-oracledb thin mode see json_type.py
#------------------------------------------------------------------------------
import json
import sys
import oracledb
import sample_env
# this script is currently only supported in python-oracledb thick mode
oracledb.init_oracle_client(lib_dir=sample_env.get_oracle_client())
connection = oracledb.connect(user=sample_env.get_main_user(),
password=sample_env.get_main_password(),
dsn=sample_env.get_connect_string())
client_version = oracledb.clientversion()[0]
db_version = int(connection.version.split(".")[0])
# this script only works with Oracle Database 21
if db_version < 21:
sys.exit("This example requires Oracle Database 21.1 or later. "
"Try json_blob.py")
# Insert JSON data
with connection.cursor() as cursor:
data = dict(name="Rod", dept="Sales", location="Germany")
inssql = "insert into CustomersAsJson values (:1, :2)"
if client_version >= 21:
# Take advantage of direct binding
cursor.setinputsizes(None, oracledb.DB_TYPE_JSON)
cursor.execute(inssql, [1, data])
else:
# Insert the data as a JSON string
cursor.execute(inssql, [1, json.dumps(data)])
# Select JSON data
with connection.cursor() as cursor:
sql = "select c.json_data from CustomersAsJson c"
if client_version >= 21:
for j, in cursor.execute(sql):
print(j)
else:
for j, in cursor.execute(sql):
print(json.loads(j.read()))
# Using JSON_VALUE to extract a value from a JSON column
sql = """select json_value(json_data, '$.location')
from CustomersAsJson
offset 0 rows fetch next 1 rows only"""
for r in cursor.execute(sql):
print(r)
# Using dot-notation to extract a value from a JSON column
sql = """select c.json_data.location
from CustomersAsJson c
offset 0 rows fetch next 1 rows only"""
if client_version >= 21:
for j, in cursor.execute(sql):
print(j)
else:
for j, in cursor.execute(sql):
print(json.loads(j.read()))
# Using JSON_OBJECT to extract relational data as JSON
sql = """select json_object('key' is d.dummy) dummy
from dual d"""
for r in cursor.execute(sql):
print(r)
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