- Hasura Cloud application
- AWS RDS Postgres database
- Oracle database
-
Connect the RDS Postgres to your Hasura Cloud application
- See steps 3 and 4 of the documentation here:
-
In your Postgres database, run the following commands to install the
oracle_fdwextension and connect your Oracle database (filling in the correct connection string and credentials for your Oracle connection)-
NOTE: You can do this via
psql, the Hasura web console UI's "Run SQL" page, or any other database administration tool you prefer
-
CREATE EXTENSION oracle_fdw;
CREATE SERVER oradb
FOREIGN DATA WRAPPER oracle_fdw
OPTIONS (dbserver '//database-2.xxxxxxxx.us-east-1.rds.amazonaws.com:1521/mydb');
CREATE USER MAPPING FOR postgres
SERVER oradb
OPTIONS (user 'admin', password 'mypassword');- For each table you would like to access through Hasura, use the
CREATE FOREIGN TABLE()statement to wire up the foreign table connection. The below example creates a foreign table in Postgres calledgenre_oraclethat maps to the remote tableGENREin the Oracle database:
CREATE FOREIGN TABLE genre_oracle (
GenreId int NOT NULL,
Name varchar(120)
)
SERVER oradb
OPTIONS (table 'GENRE');-
Make sure that the newly-created foreign tables you want to query from Hasura are "tracked"
- You can do this by pressing the "Track Table" button on the Hasura web console, under the "You are here: Data > (Database Name) > (Schema Name)" page on the web console
- IE:
https://<HASURA CLOUD URL>/consoledata/default/schema/public - See: https://hasura.io/docs/latest/graphql/core/databases/postgres/schema/tables.html#tracking-tables
-
Now, all foreign tables created should be available for querying and insert/delete mutations. You can run a GraphQL query against the foreign table to test that it is working and returning the data you expect.
- For example, using the table names given above, something like:
query {
# Query "GENRE" table in Oracle
genre_oracle {
GenreId
Name
}
}
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