144c4e722b
Includes: - CDB_Federated_Server_List_Remote_Schemas - CDB_Federated_Server_List_Remote_Tables
115 lines
4.7 KiB
PL/PgSQL
115 lines
4.7 KiB
PL/PgSQL
--------------------------------------------------------------------------------
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-- Private functions
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--------------------------------------------------------------------------------
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CREATE OR REPLACE FUNCTION @extschema@.__CDB_FS_List_Foreign_Schemas_PG(server_internal name)
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RETURNS TABLE(remote_schema name)
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AS $$
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DECLARE
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-- Import schemata from the information schema
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--
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-- "The view schemata contains all schemas in the current database
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-- that the current user has access to (by way of being the owner
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-- or having some privilege)."
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-- See https://www.postgresql.org/docs/11/infoschema-schemata.html
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--
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-- "The information schema is defined in the SQL standard and can
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-- therefore be expected to be portable and remain stable"
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-- See https://www.postgresql.org/docs/11/information-schema.html
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inf_schema name := 'information_schema';
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remote_table name := 'schemata';
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local_schema name := @extschema@.__CDB_FS_Create_Schema(server_internal, inf_schema);
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BEGIN
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-- Import the foreign schemata if not done
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IF NOT EXISTS (
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SELECT * FROM pg_class
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WHERE relnamespace = (SELECT oid FROM pg_namespace WHERE nspname = local_schema)
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AND relname = remote_table
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) THEN
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EXECUTE format('IMPORT FOREIGN SCHEMA %I LIMIT TO (%I) FROM SERVER %I INTO %I', inf_schema, remote_table, server_internal, local_schema);
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END IF;
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-- Return the result we're interested in
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RETURN QUERY EXECUTE format('SELECT schema_name::name AS remote_schema FROM %I.%I', local_schema, remote_table);
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END
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$$
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LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
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CREATE OR REPLACE FUNCTION @extschema@.__CDB_FS_List_Foreign_Tables_PG(server_internal name, remote_schema name)
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RETURNS TABLE(remote_table name)
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AS $func$
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DECLARE
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-- Import `tables` from the information schema
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--
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-- "The view tables contains all tables and views defined in the
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-- current database. Only those tables and views are shown that
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-- the current user has access to (by way of being the owner or
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-- having some privilege)."
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-- https://www.postgresql.org/docs/11/infoschema-tables.html
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-- Create local target schema if it does not exists
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inf_schema name := 'information_schema';
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remote_table name := 'tables';
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local_schema name := @extschema@.__CDB_FS_Create_Schema(server_internal, inf_schema);
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BEGIN
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-- Import the foreign `tables` if not done
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IF NOT EXISTS (
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SELECT * FROM pg_class
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WHERE relnamespace = (SELECT oid FROM pg_namespace WHERE nspname = local_schema)
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AND relname = 'tables'
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) THEN
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EXECUTE format('IMPORT FOREIGN SCHEMA %I LIMIT TO (%I) FROM SERVER %I INTO %I', inf_schema, remote_table, server_internal, local_schema);
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END IF;
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-- Return the result we're interested in
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-- Note: in this context, schema names are not to be quoted
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RETURN QUERY EXECUTE format($q$SELECT table_name::name AS remote_table FROM %I.%I WHERE table_schema = '%s'$q$, local_schema, remote_table, remote_schema);
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END
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$func$
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LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
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--------------------------------------------------------------------------------
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-- Public functions
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--------------------------------------------------------------------------------
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--
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-- List remote schemas in a federated server that the current user has access to.
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--
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CREATE OR REPLACE FUNCTION @extschema@.CDB_Federated_Server_List_Remote_Schemas(remote_server name)
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RETURNS TABLE(remote_schema name)
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AS $$
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DECLARE
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server_internal name := @extschema@.__CDB_FS_Generate_Server_Name(input_name := remote_server, check_existence := true);
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server_type name := @extschema@.__CDB_FS_server_type(server_internal);
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BEGIN
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CASE server_type
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WHEN 'postgres_fdw' THEN
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RETURN QUERY SELECT @extschema@.__CDB_FS_List_Foreign_Schemas_PG(server_internal);
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ELSE
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RAISE EXCEPTION 'Not implemented server type % for remote server %', server_type, remote_server;
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END CASE;
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END
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$$
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LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
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--
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-- List remote tables in a federated server that the current user has access to.
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--
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CREATE OR REPLACE FUNCTION @extschema@.CDB_Federated_Server_List_Remote_Tables(remote_server name, remote_schema name)
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RETURNS TABLE(remote_table name)
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AS $$
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DECLARE
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server_internal name := @extschema@.__CDB_FS_Generate_Server_Name(input_name := remote_server, check_existence := true);
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server_type name := @extschema@.__CDB_FS_server_type(server_internal);
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BEGIN
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CASE server_type
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WHEN 'postgres_fdw' THEN
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RETURN QUERY SELECT @extschema@.__CDB_FS_List_Foreign_Tables_PG(server_internal, remote_schema);
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ELSE
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RAISE EXCEPTION 'Not implemented server type % for remote server %', server_type, remote_server;
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END CASE;
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END
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$$
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LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
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