54 lines
2.0 KiB
Python
54 lines
2.0 KiB
Python
# Copyright 2020 Catalyst Cloud
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import psycopg2
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class PostgresConnection(object):
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def __init__(self, user, password='', host='localhost', port=5432):
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self.user = user
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self.password = password
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self.host = host
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self.port = port
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self.connect_str = (f"user='{self.user}' password='{self.password}' "
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f"host='{self.host}' port='{self.port}'")
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def __enter__(self, autocommit=False):
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self.conn = psycopg2.connect(self.connect_str)
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self.conn.autocommit = autocommit
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return self
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def __exit__(self, exc_type, exc_value, traceback):
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self.conn.close()
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def execute(self, statement, identifiers=None, data_values=None):
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"""Execute a non-returning statement."""
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self._execute_stmt(statement, identifiers, data_values, False)
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def query(self, query, identifiers=None, data_values=None):
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"""Execute a query and return the result set."""
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return self._execute_stmt(query, identifiers, data_values, True)
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def _execute_stmt(self, statement, identifiers, data_values, fetch):
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cmd = self._bind(statement, identifiers)
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with self.conn.cursor() as cursor:
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cursor.execute(cmd, data_values)
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if fetch:
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return cursor.fetchall()
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def _bind(self, statement, identifiers):
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if identifiers:
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return statement.format(*identifiers)
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return statement
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