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test_hana_utils.py
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test_hana_utils.py
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"""Helper utilities for HANA provider.
.. note:: This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
"""
__author__ = 'Maxim Rylov'
__date__ = '2019-11-21'
__copyright__ = 'Copyright 2019, The QGIS Project'
from hdbcli import dbapi
from qgis.core import QgsDataSourceUri, QgsVectorLayer
class QgsHanaProviderUtils:
@staticmethod
def createConnection(uri):
ds_uri = QgsDataSourceUri(uri)
conn = dbapi.connect(address=ds_uri.host(), port=ds_uri.port(), user=ds_uri.username(),
password=ds_uri.password(), ENCRYPT=True, sslValidateCertificate=False, CHAR_AS_UTF8=1)
conn.setautocommit(False)
return conn
@staticmethod
def createVectorLayer(conn_parameters, layer_name):
layer = QgsVectorLayer(conn_parameters, layer_name, 'hana')
assert layer.isValid()
return layer
@staticmethod
def executeSQL(conn, statement, parameters=None, return_result=False):
assert conn
cursor = conn.cursor()
assert cursor
res = None
if parameters is not None:
cursor.executemany(statement, parameters)
else:
cursor.execute(statement)
if return_result:
res = cursor.fetchone()
cursor.close()
conn.commit()
if return_result:
return res[0]
@staticmethod
def executeSQLMany(conn, statement, parameters):
QgsHanaProviderUtils.executeSQL(conn, statement, parameters)
@staticmethod
def executeSQLFetchOne(conn, statement):
return QgsHanaProviderUtils.executeSQL(conn, statement, return_result=True)
@staticmethod
def createAndFillTable(conn, create_statement, insert_statement, insert_args):
QgsHanaProviderUtils.executeSQL(conn, create_statement)
QgsHanaProviderUtils.executeSQLMany(conn, insert_statement, insert_args)
@staticmethod
def dropTableIfExists(conn, schema_name, table_name):
res = QgsHanaProviderUtils.executeSQLFetchOne(conn,
f"SELECT COUNT(*) FROM SYS.TABLES WHERE "
f"SCHEMA_NAME='{schema_name}' AND TABLE_NAME='{table_name}'")
if res != 0:
QgsHanaProviderUtils.executeSQL(conn, f'DROP TABLE "{schema_name}"."{table_name}" CASCADE')
@staticmethod
def dropSchemaIfExists(conn, schema_name):
res = QgsHanaProviderUtils.executeSQLFetchOne(conn,
f"SELECT COUNT(*) FROM SYS.SCHEMAS WHERE SCHEMA_NAME='{schema_name}'")
if res != 0:
QgsHanaProviderUtils.executeSQL(conn, f'DROP SCHEMA "{schema_name}" CASCADE')
@staticmethod
def createAndFillDefaultTables(conn, schema_name):
QgsHanaProviderUtils.dropSchemaIfExists(conn, schema_name)
QgsHanaProviderUtils.executeSQL(conn, f'CREATE SCHEMA "{schema_name}"')
create_sql = f'CREATE TABLE "{schema_name}"."some_data" ( ' \
'"pk" INTEGER GENERATED BY DEFAULT AS IDENTITY NOT NULL PRIMARY KEY,' \
'"cnt" INTEGER,' \
'"name" NVARCHAR(32) DEFAULT \'qgis\',' \
'"name2" NVARCHAR(32) DEFAULT \'qgis\',' \
'"num_char" NVARCHAR(1),' \
'"dt" TIMESTAMP,' \
'"date" DATE,' \
'"time" TIME,' \
'"geom" ST_GEOMETRY(4326))'
insert_sql = f'INSERT INTO "{schema_name}"."some_data" ("pk", "cnt", "name", "name2", "num_char", "dt",' \
'"date", "time", "geom") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ST_GeomFromEWKB(?)) '
insert_args = [
[5, -200, None, 'NuLl', '5', '2020-05-04 12:13:14', '2020-05-02', '12:13:01',
bytes.fromhex('0101000020E61000001D5A643BDFC751C01F85EB51B88E5340')],
[3, 300, 'Pear', 'PEaR', '3', None, None, None, None],
[1, 100, 'Orange', 'oranGe', '1', '2020-05-03 12:13:14', '2020-05-03', '12:13:14',
bytes.fromhex('0101000020E61000006891ED7C3F9551C085EB51B81E955040')],
[2, 200, 'Apple', 'Apple', '2', '2020-05-04 12:14:14', '2020-05-04', '12:14:14',
bytes.fromhex('0101000020E6100000CDCCCCCCCC0C51C03333333333B35140')],
[4, 400, 'Honey', 'Honey', '4', '2021-05-04 13:13:14', '2021-05-04', '13:13:14',
bytes.fromhex('0101000020E610000014AE47E17A5450C03333333333935340')]]
QgsHanaProviderUtils.createAndFillTable(conn, create_sql, insert_sql, insert_args)
QgsHanaProviderUtils.executeSQL(conn, f'COMMENT ON TABLE "{schema_name}"."some_data" IS \'QGIS Test Table\'')
QgsHanaProviderUtils.executeSQL(conn, f'CREATE VIEW "{schema_name}"."some_data_view" AS SELECT * FROM '
f'"{schema_name}"."some_data"')
create_sql = f'CREATE TABLE "{schema_name}"."some_poly_data" ( ' \
'"pk" INTEGER NOT NULL GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,' \
'"geom" ST_GEOMETRY(4326))'
insert_sql = f'INSERT INTO "{schema_name}"."some_poly_data" ("pk", "geom") VALUES (?, ST_GeomFromText(?, 4326))'
insert_args = [
[1, 'Polygon ((-69.0 81.4, -69.0 80.2, -73.7 80.2, -73.7 76.3, -74.9 76.3, -74.9 81.4, -69.0 81.4))'],
[2, 'Polygon ((-67.6 81.2, -66.3 81.2, -66.3 76.9, -67.6 76.9, -67.6 81.2))'],
[3, 'Polygon ((-68.4 75.8, -67.5 72.6, -68.6 73.7, -70.2 72.9, -68.4 75.8))'],
[4, None]]
QgsHanaProviderUtils.createAndFillTable(conn, create_sql, insert_sql, insert_args)
@staticmethod
def cleanUp(conn, schema_name):
QgsHanaProviderUtils.dropSchemaIfExists(conn, schema_name)
@staticmethod
def generateSchemaName(conn, prefix):
sql = "SELECT REPLACE(CURRENT_UTCDATE, '-', '') || '_' || BINTOHEX(SYSUUID) FROM DUMMY;"
uid = QgsHanaProviderUtils.executeSQL(conn, sql, return_result=True)
return f'{prefix}_{uid}'