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# SPDX-License-Identifier: AGPL-3.0-or-later | ||
""" | ||
PostgreSQL database (Offline) | ||
""" | ||
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import psycopg2 | ||
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engine_type = 'offline' | ||
host = "127.0.0.1" | ||
port = "5432" | ||
database = "" | ||
username = "" | ||
password = "" | ||
query_str = "" | ||
limit = 10 | ||
paging = True | ||
result_template = 'key-value.html' | ||
_connection = None | ||
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def init(engine_settings): | ||
if 'query_str' not in engine_settings: | ||
raise ValueError('query_str cannot be empty') | ||
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if not engine_settings['query_str'].lower().startswith('select '): | ||
raise ValueError('only SELECT query is supported') | ||
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global _connection | ||
_connection = psycopg2.connect( | ||
database = database, | ||
user = username, | ||
password = password, | ||
host = host, | ||
port = port, | ||
) | ||
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def search(query, params): | ||
query_params = {'query': query} | ||
query_to_run = query_str + ' LIMIT {0} OFFSET {1}'.format(limit, (params['pageno'] - 1) * limit) | ||
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with _connection: | ||
with _connection.cursor() as cur: | ||
cur.execute(query_str, query_params) | ||
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return _fetch_results(cur) | ||
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def _fetch_results(cur): | ||
results = [] | ||
titles = [] | ||
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try: | ||
titles = [column_desc.name for column_desc in cur.description] | ||
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for res in cur: | ||
result = dict(zip(titles, map(str, res))) | ||
result['template'] = result_template | ||
results.append(result) | ||
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# no results to fetch | ||
except psycopg2.ProgrammingError: | ||
pass | ||
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return results |
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