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from psycopg import connect
def create_db(
hostname="localhost", username=None, password=None, dbname=None, port=None
):
"""Create test database.
:param hostname: string
:param username: string
:param password: string
:param dbname: string
:param port: int
:return:
"""
cn = create_cn(hostname, password, username, "postgres", port)
cn.autocommit = True
with cn.cursor() as cr:
cr.execute(f"drop database if exists {dbname}")
cr.execute(f"create database {dbname}")
cn.close()
cn = create_cn(hostname, password, username, dbname, port)
return cn
def create_cn(hostname, password, username, dbname, port):
"""
Open connection to database.
:param hostname:
:param password:
:param username:
:param dbname: string
:return: psycopg2.connection
"""
cn = connect(
host=hostname, user=username, dbname=dbname, password=password, port=port
)
print(f"Created connection: {cn.info.get_parameters()}.")
return cn
def pgbouncer_available(hostname="localhost", password=None, username="postgres"):
cn = None
try:
cn = create_cn(hostname, password, username, "pgbouncer", 6432)
return True
except:
print("Pgbouncer is not available.")
finally:
if cn:
cn.close()
return False
def drop_db(hostname="localhost", username=None, password=None, dbname=None, port=None):
"""
Drop database.
:param hostname: string
:param username: string
:param password: string
:param dbname: string
"""
cn = create_cn(hostname, password, username, "postgres", port)
# Needed for DB drop.
cn.autocommit = True
with cn.cursor() as cr:
cr.execute(f"drop database if exists {dbname}")
close_cn(cn)
def close_cn(cn=None):
"""
Close connection.
:param connection: psycopg2.connection
"""
if cn:
cn_params = cn.info.get_parameters()
cn.close()
print(f"Closed connection: {cn_params}.")
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