psycopg2

问题 I want connect my app that are in GAE with ElephantDB. I want use the lib psycopg2 and I found a problem. I installed the lib in local to test it and work perfectly and then I installed the lib in lib folder on my app as I have done many times with other libs. This time with pip install -t appname/lib/ psycopg2 So, dev server dectect the lib, but say me that : ImportError: No module named psycopg2._psycopg At first I thought that the problem was python version that dev_server was executing,

问题 I'm using Psycopg2 in Python to access a PostgreSQL database. I'm curious if it's safe to use the with closing() pattern to create and use a cursor, or if I should use an explicit try/except wrapped around the query. My question is concerning inserting or updating, and transactions. As I understand it, all Psycopg2 queries occur within a transaction, and it's up to calling code to commit or rollback the transaction. If within a with closing(... block an error occurs, is a rollback issued? In

问题 I'd like to use psycopg2 to INSERT multiple rows and then return all the id s (in order) using a single query. This is what PostgreSQL's RETURNING extension is designed for, and it seems to work fine using cursor.execute : cursor.execute( "INSERT INTO my_table (field_1, field_2) " "VALUES (0, 0), (0, 0) RETURNING id;" ) print cursor.fetchall() [(1,), (2,)] Now, in order to pass in dynamically-generated data, it seems like cursor.executemany is the way to go: data = [(0, 0), (0, 0)] cursor

问题 I am trying to connect to my postgres database using psycopg2 with sslmode='required' param; however, I get the following error psycopg2.OperationalError: sslmode value "require" invalid when SSL support is not compiled in Heres a couple details about my system Mac OS X El Capitan Python 2.7 Installed psycopg2 via pip Installed python via homebrew Here is what I tried to do to fix the problem brew uninstall python which python still shows python living in /usr/local/bin/python , tried to

问题 I have the sqlalchemy model with jsonb field and marshmallow schema for this model: class Settings(db.Model): id = db.Column(UUID, primary_key=True, server_default=text("uuid_generate_v4()")) settings = db.Column(JSONB) class SettingsSchema(ma.ModelSchema): class Meta: model = Settings I'm serializing it in json like: settings = Settings(settings={'qwerty': 'test'}) settings_schema = SettingsSchema(many=False, exclude=('id', )) body = settings_schema.dump(settings).data and json view of the

问题 I am trying to insert a text column of into a Redshift DB. I get an error DataError: value too long for type character varying(256) Given below is the code I tried. The description column has text and the length goes upto 2000 characters. Could anyone assist on how I could have this column inserted into the table. DF['description'] = DF['description'].str[:200].astype(str) Could anyone assist, thanks. 回答1: You should be using str.slice . df['description'] = df['description'].str.slice(0,255)

问题 I am trying to insert a text column of into a Redshift DB. I get an error DataError: value too long for type character varying(256) Given below is the code I tried. The description column has text and the length goes upto 2000 characters. Could anyone assist on how I could have this column inserted into the table. DF['description'] = DF['description'].str[:200].astype(str) Could anyone assist, thanks. 回答1: You should be using str.slice . df['description'] = df['description'].str.slice(0,255)

问题 When I create database from pgadmin 4, it always show error popup: Error saving properties. My computer info: Linux Mint 18.3 pgAdmin 4 2.1 from https://wiki.postgresql.org/wiki/Apt Python 3.5.2 (default, Nov 23 2017, 16:37:01) [GCC 5.4.0 20160609] My error in pgadmin4.log: Traceback (most recent call last): File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 180, in run_wsgi execute(self.server.app) File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 168, in execute

问题 I'm attempting to make the switch from Windows to ubuntu (am using 12.04 LTS) and am trying to use some of my old scripts to run my old databases. Previously I used postgresql and psycopg2 to maintain them and I am trying to do so again here. My error is around importing a csv file to a table using the copy expert command. Code is as follows: #!/usr/bin/env python import psycopg2 as psy import sys conn = psy.connect("dbname, user, host, password") # with the appropriate values curs = conn

问题 my code on aws lambda: import sys, boto3, logging, rds_config, psycopg2 rds_host = "hostname" name = rds_config.db_username password = rds_config.db_password db_name = rds_config.db_name s3 = boto3.resource('s3') rds_client = boto3.client('rds',aws_access_key_id=Access_Key,aws_secret_access_key=Secret_Access_Key) instances = rds_client.describe_db_instances() print (instances) try: conn = psycopg2.connect(host=rds_host, database=db_name, user=name, password=password) cur = conn.cursor()