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from psycopg2 import connect
from psycopg2.extensions import AsIs
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)
# ISOLATION_LEVEL_AUTOCOMMIT = 0
# Needed for DB creation.
cn.set_isolation_level(0)
with cn.cursor() as cr:
cr.execute("drop database if exists %s", (AsIs(dbname),))
cr.execute("create database %s", (AsIs(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, database=dbname, password=password, port=port
)
print(f"Created connection: {cn.dsn}.")
return cn
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)
# ISOLATION_LEVEL_AUTOCOMMIT = 0
# Needed for DB drop.
cn.set_isolation_level(0)
with cn.cursor() as cr:
cr.execute("drop database if exists %s", (AsIs(dbname),))
close_cn(cn)
def close_cn(cn=None):
"""
Close connection.
:param connection: psycopg2.connection
"""
if cn:
cn.close()
print(f"Closed connection: {cn.dsn}.")
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