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include/sql/exchange_do_create_tables.sql
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193
include/sql/exchange_do_create_tables.sql
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--
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-- This file is part of TALER
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-- Copyright (C) 2014--2022 Taler Systems SA
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--
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-- TALER is free software; you can redistribute it and/or modify it under the
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-- terms of the GNU General Public License as published by the Free Software
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-- Foundation; either version 3, or (at your option) any later version.
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--
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-- TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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-- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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-- A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License along with
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-- TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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--
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---------------------------------------------------------------------------
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-- Main DB setup loop
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---------------------------------------------------------------------------
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CREATE OR REPLACE FUNCTION exchange_do_create_tables(
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num_partitions INTEGER
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-- NULL: no partitions, add foreign constraints
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-- 0: no partitions, no foreign constraints
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-- 1: only 1 default partition
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-- > 1: normal partitions
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)
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RETURNS VOID
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LANGUAGE plpgsql
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AS $$
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DECLARE
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tc CURSOR FOR
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SELECT table_serial_id
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,name
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,action
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,partitioned
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,by_range
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FROM exchange.exchange_tables
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WHERE NOT finished
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ORDER BY table_serial_id ASC;
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BEGIN
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FOR rec IN tc
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LOOP
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CASE rec.action
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-- "create" actions apply to master and partitions, providing the partition ID to the creation function (if any)
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WHEN 'create'
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THEN
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IF (rec.partitioned AND
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(num_partitions IS NOT NULL))
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THEN
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-- Create master table with partitioning.
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EXECUTE FORMAT(
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'SELECT exchange.create_table_%s (%s)'::text
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,rec.name
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,quote_literal('0')
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);
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IF (rec.by_range OR
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(num_partitions = 0))
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THEN
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-- Create default partition.
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IF (rec.by_range)
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THEN
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-- Range partition
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EXECUTE FORMAT(
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'CREATE TABLE exchange.%s_default'
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' PARTITION OF %s'
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' DEFAULT'
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,rec.name
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,rec.name
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);
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ELSE
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-- Hash partition
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EXECUTE FORMAT(
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'CREATE TABLE exchange.%s_default'
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' PARTITION OF %s'
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' FOR VALUES WITH (MODULUS 1, REMAINDER 0)'
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,rec.name
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,rec.name
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);
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END IF;
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ELSE
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FOR i IN 1..num_partitions LOOP
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-- Create num_partitions
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EXECUTE FORMAT(
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'CREATE TABLE exchange.%I'
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' PARTITION OF %I'
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' FOR VALUES WITH (MODULUS %s, REMAINDER %s)'
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,rec.name || '_' || i
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,rec.name
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,num_partitions
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,i-1
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);
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END LOOP;
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END IF;
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ELSE
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-- Only create master table. No partitions.
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EXECUTE FORMAT(
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'SELECT exchange.create_table_%s ()'::text
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,rec.name
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);
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END IF;
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EXECUTE FORMAT(
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'DROP FUNCTION exchange.create_table_%s'::text
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,rec.name
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);
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-- "alter" actions apply to master and partitions (but are called without partition ID, as altering master applies to partitions for these); use when changing table layouts (adding or removing columns).
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WHEN 'alter'
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THEN
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-- Alter master table.
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EXECUTE FORMAT(
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'SELECT exchange.alter_table_%s ()'::text
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,rec.name
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);
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EXECUTE FORMAT(
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'DROP FUNCTION exchange.alter_table_%s'::text
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,rec.name
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);
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-- Constrain action apply to master OR each partition (but not on master if we have partitions); use to create (or remove) indices or constraints that apply to a partition and may not be aligned with the partition key
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WHEN 'constrain'
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THEN
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ASSERT rec.partitioned, 'constrain action only applies to partitioned tables';
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IF (num_partitions IS NULL)
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THEN
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-- Constrain master table
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EXECUTE FORMAT(
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'SELECT exchange.constrain_table_%s (NULL)'::text
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,rec.name
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);
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ELSE
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IF ( (num_partitions = 0) OR
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(rec.by_range) )
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THEN
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-- Constrain default table
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EXECUTE FORMAT(
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'SELECT exchange.constrain_table_%s (%s)'::text
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,rec.name
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,quote_literal('default')
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);
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ELSE
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-- Constrain each partition
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FOR i IN 1..num_partitions LOOP
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EXECUTE FORMAT(
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'SELECT exchange.constrain_table_%s (%s)'::text
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,rec.name
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,quote_literal(i)
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);
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END LOOP;
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END IF;
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END IF;
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EXECUTE FORMAT(
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'DROP FUNCTION exchange.constrain_table_%s'::text
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,rec.name
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);
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-- Foreign actions only apply if partitioning is off; use for foreign-key constraints that may span partitions
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WHEN 'foreign'
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THEN
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IF (num_partitions IS NULL)
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THEN
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-- Add foreign constraints
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EXECUTE FORMAT(
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'SELECT exchange.foreign_table_%s (%s)'::text
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,rec.name
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,NULL
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);
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END IF;
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EXECUTE FORMAT(
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'DROP FUNCTION exchange.foreign_table_%s'::text
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,rec.name
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);
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-- "master" actions only apply to the master table
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WHEN 'master'
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THEN
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EXECUTE FORMAT(
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'SELECT exchange.master_table_%s ()'::text
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,rec.name
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);
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EXECUTE FORMAT(
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'DROP FUNCTION exchange.master_table_%s'::text
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,rec.name
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);
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ELSE
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ASSERT FALSE, 'unsupported action type: ' || rec.action;
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END CASE; -- END CASE (rec.action)
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-- Mark as finished
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UPDATE exchange.exchange_tables
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SET finished=TRUE
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WHERE table_serial_id=rec.table_serial_id;
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END LOOP; -- create/alter/drop actions
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END $$;
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COMMENT ON FUNCTION exchange_do_create_tables
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IS 'Creates all tables for the given number of partitions that need creating. Does NOT support sharding.';
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