mirror of
https://github.com/timescale/timescaledb.git
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4dcbe6114d
This PR add support for primary-key, foreign-key, unique, and exclusion constraints. Previously supported are CHECK and NOT NULL constraints. Now, foreign key constraints where a hypertable references a plain table is support (while vice versa, with a plain table references a hypertable, is still not).
97 lines
3.1 KiB
PL/PgSQL
97 lines
3.1 KiB
PL/PgSQL
-- This file contains functions related to getting information about the
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-- schema of a hypertable, including columns, their types, etc.
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-- Check if a given table OID is a main table (i.e. the table a user
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-- targets for SQL operations) for a hypertable
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CREATE OR REPLACE FUNCTION _timescaledb_internal.is_main_table(
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table_oid regclass
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)
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RETURNS bool LANGUAGE SQL STABLE AS
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$BODY$
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SELECT EXISTS(SELECT 1 FROM _timescaledb_catalog.hypertable WHERE table_name = relname AND schema_name = nspname)
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FROM pg_class c
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INNER JOIN pg_namespace n ON (n.OID = c.relnamespace)
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WHERE c.OID = table_oid;
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$BODY$;
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-- Check if given table is a hypertable's main table
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CREATE OR REPLACE FUNCTION _timescaledb_internal.is_main_table(
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schema_name NAME,
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table_name NAME
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)
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RETURNS BOOLEAN LANGUAGE SQL STABLE AS
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$BODY$
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SELECT EXISTS(
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SELECT 1 FROM _timescaledb_catalog.hypertable h
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WHERE h.schema_name = is_main_table.schema_name AND
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h.table_name = is_main_table.table_name
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);
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$BODY$;
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-- Get a hypertable given its main table OID
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CREATE OR REPLACE FUNCTION _timescaledb_internal.hypertable_from_main_table(
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table_oid regclass
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)
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RETURNS _timescaledb_catalog.hypertable LANGUAGE SQL STABLE AS
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$BODY$
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SELECT h.*
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FROM pg_class c
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INNER JOIN pg_namespace n ON (n.OID = c.relnamespace)
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INNER JOIN _timescaledb_catalog.hypertable h ON (h.table_name = c.relname AND h.schema_name = n.nspname)
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WHERE c.OID = table_oid;
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$BODY$;
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CREATE OR REPLACE FUNCTION _timescaledb_internal.main_table_from_hypertable(
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hypertable_id int
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)
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RETURNS regclass LANGUAGE SQL STABLE AS
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$BODY$
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SELECT format('%I.%I',h.schema_name, h.table_name)::regclass
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FROM _timescaledb_catalog.hypertable h
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WHERE id = hypertable_id;
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$BODY$;
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-- Get the name of the time column for a chunk.
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--
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-- schema_name, table_name - name of the schema and table for the table represented by the crn.
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CREATE OR REPLACE FUNCTION _timescaledb_internal.time_col_name_for_chunk(
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schema_name NAME,
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table_name NAME
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)
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RETURNS NAME LANGUAGE PLPGSQL STABLE AS
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$BODY$
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DECLARE
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time_col_name NAME;
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BEGIN
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SELECT h.time_column_name INTO STRICT time_col_name
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FROM _timescaledb_catalog.hypertable h
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INNER JOIN _timescaledb_catalog.chunk c ON (c.hypertable_id = h.id)
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WHERE c.schema_name = time_col_name_for_chunk.schema_name AND
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c.table_name = time_col_name_for_chunk.table_name;
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RETURN time_col_name;
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END
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$BODY$;
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-- Get the type of the time column for a chunk.
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--
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-- schema_name, table_name - name of the schema and table for the table represented by the crn.
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CREATE OR REPLACE FUNCTION _timescaledb_internal.time_col_type_for_chunk(
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schema_name NAME,
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table_name NAME
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)
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RETURNS REGTYPE LANGUAGE PLPGSQL STABLE AS
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$BODY$
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DECLARE
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time_col_type REGTYPE;
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BEGIN
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SELECT h.time_column_type INTO STRICT time_col_type
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FROM _timescaledb_catalog.hypertable h
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INNER JOIN _timescaledb_catalog.chunk c ON (c.hypertable_id = h.id)
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WHERE c.schema_name = time_col_type_for_chunk.schema_name AND
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c.table_name = time_col_type_for_chunk.table_name;
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RETURN time_col_type;
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END
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$BODY$;
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