Need to access the SQL server data from pgAdmin.
I have tried with foreign data wrapper, but it's not working.
I'm trying to access the data from " dbo.example " which is in SQL server from pgAdmin.
Please provide the prerequisites to achieve this.
Sample Code:
CREATE EXTENSION postgres_fdw;
CREATE SERVER mssql_pm_server
FOREIGN DATA WRAPPER postgres_fdw
OPTIONS (host '121.112.141.88', port '1874');
CREATE USER MAPPING FOR postgres
SERVER mssql_pm_server
OPTIONS ( user '1122', password '1122',dbname 'db_Product');
CREATE FOREIGN TABLE mssql_pm_table1(
BusinessEntityID int NOT NULL,
TerritoryID text
)
SERVER mssql_pm_server
OPTIONS (table_name 'dbo.example');
Error:
ERROR: could not connect to server "mssql_pm_server"
DETAIL: server closed the connection unexpectedly This probably
means the server terminated abnormally before or while processing the
request.
SQL state: 08001
You need the proper foreign data wrapper to access Microsoft SQL server. The PostgreSQL foreign data wrapper is to connect to PostgreSQL databases.
You should use tds_fdw.
Related
I'm really stuck with the following problem.
At GCloud SQL I have a running postgres' instance.
That instance contains two databases. From one database (source_db) I want to access to another database's (another_db) table (foreign_table) using postgres_fdw extension. The recipe I'm employing currently is this:
1)
CREATE EXTENSION postgres_fdw;
CREATE SERVER foreign_db
FOREIGN DATA WRAPPER postgres_fdw
OPTIONS (dbname 'another_db', port '5432', host '<A_PRIVATE_IP>');
CREATE USER MAPPING for guest
SERVER foreign_db
OPTIONS (user 'guest', password 's3cr3t');
CREATE FOREIGN TABLE foreign_table
(
// columns descripions
)
SERVER foreign_db OPTIONS (table_name 'foreign_table');
-- Alternatively I also tried with
CREATE SCHEMA external;
IMPORT FOREIGN SCHEMA public from SERVER foreign_db into external;
GRANT SELECT ON TABLE foreign_table TO guest;
The above commands runs without error, but when I tried to actually access the table I got this:
If using "external" schema
source_db=> select 1 from external.foreign_table limit 1;
ERROR: permission denied for relation foreign_table
CONTEXT: Remote SQL command: SELECT NULL FROM public.foreign_table (*)
If not using "external" schema
source_db=> select 1 from foreign_table limit 1;
ERROR: permission denied for relation foreign_table
CONTEXT: Remote SQL command: SELECT NULL FROM public.foreign_table
The only thing that smells a little is that the error message (at *) displays "public.foreign_table" instead of "external.foreign_table" even when I'm using external schema... but i don't know is that actually means something :S
As far I researched there is no way to login into the posgres instance as a superuser as that is not allowed by the Gcloud's SQL services neither a way to edit the pg_hba.conf file in order to adjust client's authentication affairs.
I searched in a lot of places but without finding what i can do to sort this out. Among the sites and pages i looked are the below list
The official documentation
A personal blog's post
This other SO post having a related issue
This post and this other post regarding permissions and authorizations.
A Nice tutorial about authentication and authorization
P.S.
I was able to make this on a postgres' instance that i ran locally.
User guest on the remote server doesn't have permissions to SELECT from the table. Since the query on the remote server is executed as user guest, you get an error.
GRANT the SELECT privilege on the table on the remote server to the user.
hoping for some help as I am very new to postgresql admin!
I have 2 servers added to pgadmin, server 1 is a hosted db on Heroku the other is local to the server
I want to add the Heroku db as foreign tables to the local db
can I link these 2 servers? as so far I have failed
I have the fdw extension setup locally, and I am able to use it across three local dbs ok, do I need the extension also setup on the Heroku db?
I have setup the fdw server as
host localhost --- should this be the Heroku host path? or is this ok since I have added - --server local? I get fsrvoption error if I add actual host path
dbname dbname
port 5432
and then setup user
user username
password password
any help appreciated!
mal
You don't have to set up anything on the remote server to access it via foreign data wrapper; the foreign data wrapper will access the remote database as a regular database client.
Once you hace set up postgres_fdw correctly, you can use it to access tables on the remote server just as if they were local tables. A foreign table is a bit like a view in some respects.
Maybe it helps to understand the objects involved:
The foreign data wrapper encapsulates the code to access the remote data source (PostgreSQL client).
The foreign server wraps the connect string for the remote database.
The user mapping contains the credentials for a user to access the foreign server.
The foreign table describes a table on the remote server.
You can use the command IMPORT FOREIGN SCHEMA to automatically define foreign tables for all (or part) of the tables in a schema on the remote server.
Once the foreign tables are defined correctly, you can use them in SQL statements just like local tables, but you will actually read and write data on the remote server.
After some debugging, the problem turned out to be this:
Creating the foreign server using pgAdmin caused a strange error with fsrvoption (running CREATE SERVER via the query tool worked).
Creating the foreign server with localhost rather than the correct server address unsurprisingly gave the error that the database doesn't exist.
Cant connect from postgresql server to hive databases on remote server.
Tried using the following queries but doenst work. Connection established but no response back from hive server.
--create extension postgres_fdw;
DROP USER MAPPING IF EXISTS FOR CURRENT_USER SERVER data_db;
drop server data_db;
create server data_db
foreign data wrapper postgres_fdw
options (host 'net.com' , port 'hiveport' , SSLMODE 'allow', dbname 'datah');
create user mapping for current_user
server data_db
options(user 'user', password 'password');
drop schema app;
create schema app;
import foreign schema public
from server data_db
into app;
The result was unknown expecting authentication request from the server (SQL state 08001).
I would like to be able to establish a connection to the hive database clusters using the fdw from postgresql to import selective data.
Thank you very much in advance and best regards!
postgres_fdw is for connecting to other PostgreSQL instances. Hive doesn't use the same wire protocol as PostgreSQL does, so surely postgres_fdw would not be expected to connect to it successfully. Perhaps you can try https://github.com/youngwookim/hive-fdw-for-postgresql or https://sourceforge.net/projects/hadoopfdw/.
I have a postgresql db at home and one on the cloud. I'd like to add my home db to the cloud db so I can query easily between databases. How can this be done? Without using dblink http://www.postgresonline.com/journal/archives/44-Using-DbLink-to-access-other-PostgreSQL-Databases-and-Servers.html
My home db will use a dynamic ip provider (can I add a dynamic ip address such as myhomedb.dedyn.io to postgresql settings?)
I'm stating all this in case there are any issues. My home db will only be used to update massive amount of data but isn't mission critical (as we know cloud computing isn't cheap).
Thanks in advance.
Looks like postgres-fdw is the way to go: https://www.postgresql.org/docs/current/postgres-fdw.html
First install the extension:
CREATE EXTENSION postgres_fdw;
Then create a foreign server using CREATE SERVER. In this example we
wish to connect to a PostgreSQL server on host 192.83.123.89
listening on port 5432. The database to which the connection is made
is named foreign_db on the remote server:
CREATE SERVER foreign_server
FOREIGN DATA WRAPPER postgres_fdw
OPTIONS (host '192.83.123.89', port '5432', dbname 'foreign_db');
A user mapping, defined with CREATE USER MAPPING, is needed as well
to identify the role that will be used on the remote server:
CREATE USER MAPPING FOR local_user
SERVER foreign_server
OPTIONS (user 'foreign_user', password 'password');
Now it is possible to create a foreign table with CREATE FOREIGN
TABLE. In this example we wish to access the table named
some_schema.some_table on the remote server. The local name for it
will be foreign_table:
CREATE FOREIGN TABLE foreign_table (
id integer NOT NULL,
data text
)
SERVER foreign_server
OPTIONS (schema_name 'some_schema', table_name 'some_table');
It's essential that the data types and other properties of the columns
declared in CREATE FOREIGN TABLE match the actual remote table.
Column names must match as well, unless you attach column_name options
to the individual columns to show how they are named in the remote
table. In many cases, use of IMPORT FOREIGN SCHEMA is preferable to
constructing foreign table definitions manually.
Am trying to connect postgresql to another databas (MySQL) using ODBC_FDW, Am trying to follow the steps mentioned in the github page as below but after trying the below I keep getting the error
ERROR: Connecting to driver
SQL state: 58000
CREATE EXTENSION odbc_fdw schema td_tci;
CREATE SERVER mysql_server
FOREIGN DATA WRAPPER odbc_fdw
OPTIONS ( dsn 'mysql');
CREATE USER MAPPING FOR postgres
SERVER mysql_server
OPTIONS (odbc_UID 'root', odbc_PWD 'root');
CREATE FOREIGN TABLE td_tci.tsi_lead_queue (
columns...
)
SERVER mysql_server
OPTIONS (
--schema 'tci',
--table 'tsi_lead_queue',
sql_query 'select * from tsi_lead_queue'
);
select * from td_tci.tsi_lead_queue
it's working now, I had to define the DSN as system DSN not User's, after doing that it worked fine