historic-view #92
@ -1,174 +0,0 @@
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-- ========================================================
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-- Historization
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-- --------------------------------------------------------
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drop PROCEDURE if exists tx_create_historical_view;
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drop procedure if exists tx_create_historicization;
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drop view if exists hs_hosting_asset_hv;
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drop table if exists hs_hosting_asset_ex;
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drop trigger if exists hs_hosting_asset_historicize_tg on hs_hosting_asset;
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drop procedure if exists tx_historicize_tf;
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drop type "tx_operation";
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CREATE TYPE "tx_operation" AS ENUM ('INSERT', 'UPDATE', 'DELETE');
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CREATE OR REPLACE FUNCTION tx_historicize_tf()
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RETURNS trigger
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LANGUAGE plpgsql STRICT AS $$
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DECLARE
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currentTask VARCHAR(127);
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curContextId bigint;
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"row" RECORD;
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"alive" BOOLEAN;
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"sql" varchar;
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BEGIN
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-- determine task
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currentTask = current_setting('hsadminng.currentTask');
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assert currentTask IS NOT NULL AND length(currentTask) >= 12,
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format('hsadminng.currentTask (%s) must be defined and min 12 characters long, please use "SET LOCAL ...;"', currentTask);
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assert length(currentTask) <= 127,
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format('hsadminng.currentTask (%s) must not be longer than 127 characters"', currentTask);
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IF (TG_OP = 'INSERT') OR (TG_OP = 'UPDATE') THEN
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"row" := NEW;
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"alive" := TRUE;
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ELSE -- DELETE or TRUNCATE
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"row" := OLD;
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"alive" := FALSE;
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END IF;
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curContextId := txid_current()+bigIntHash(currentTask);
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sql := format('INSERT INTO %3$I_ex ' ||
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' VALUES (DEFAULT, curContextId, %1$L, %2$L, $1.*)', TG_OP, alive, TG_TABLE_NAME);
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RAISE NOTICE 'sql: %', sql;
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EXECUTE sql USING "row";
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RETURN "row";
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END; $$;
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-- ------
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CREATE OR REPLACE PROCEDURE tx_create_historical_view(baseTable varchar)
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LANGUAGE plpgsql AS $$
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DECLARE
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createTriggerSQL varchar;
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viewName varchar;
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versionsTable varchar;
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createViewSQL varchar;
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baseCols varchar;
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BEGIN
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viewName = quote_ident(format('%s_hv', baseTable));
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versionsTable = quote_ident(format('%s_ex', baseTable));
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baseCols = (SELECT string_agg(quote_ident(column_name), ', ')
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FROM information_schema.columns
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WHERE table_schema = 'public' AND table_name = baseTable);
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createViewSQL = format(
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'CREATE OR REPLACE VIEW %1$s AS' ||
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'(' ||
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' SELECT %2$s' ||
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' FROM %3$s' ||
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' WHERE alive = TRUE' ||
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' AND version_id IN' ||
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' (' ||
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' SELECT max(vt.version_id) AS history_id' ||
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' FROM %3$s AS vt' ||
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' JOIN tx_history as txh ON vt.tx_id = txh.tx_id' ||
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' WHERE txh.tx_timestamp <= current_setting(''hsadminng.historical_timestamp'')::timestamp' ||
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' GROUP BY id' ||
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' )' ||
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')',
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viewName, baseCols, versionsTable
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);
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RAISE NOTICE 'sql: %', createViewSQL;
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EXECUTE createViewSQL;
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createTriggerSQL = 'CREATE TRIGGER ' || baseTable || '_historicize_tg' ||
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' AFTER INSERT OR DELETE OR UPDATE ON ' || baseTable ||
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' FOR EACH ROW EXECUTE PROCEDURE tx_historicize_tf()';
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RAISE NOTICE 'sql: %', createTriggerSQL;
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EXECUTE createTriggerSQL;
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END; $$;
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-- ------
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CREATE OR REPLACE PROCEDURE tx_create_historicization(baseTable varchar)
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LANGUAGE plpgsql AS $$
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DECLARE
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createHistTableSql varchar;
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createTriggerSQL varchar;
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viewName varchar;
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versionsTable varchar;
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createViewSQL varchar;
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baseCols varchar;
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BEGIN
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-- create the history table
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createHistTableSql = '' ||
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'CREATE TABLE ' || baseTable || '_ex (' ||
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' version_id serial PRIMARY KEY,' ||
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' context_id bigint NOT NULL REFERENCES tx_context(contextid),' ||
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' trigger_op tx_operation NOT NULL,' ||
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' alive boolean not null,' ||
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-- followed by all columns of the original table
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' LIKE ' || baseTable ||
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' EXCLUDING CONSTRAINTS' ||
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' EXCLUDING STATISTICS' ||
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')';
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RAISE NOTICE 'sql: %', createHistTableSql;
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EXECUTE createHistTableSql;
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-- create the historical view
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viewName = quote_ident(format('%s_hv', baseTable));
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versionsTable = quote_ident(format('%s_ex', baseTable));
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baseCols = (SELECT string_agg(quote_ident(column_name), ', ')
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FROM information_schema.columns
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WHERE table_schema = 'public' AND table_name = baseTable);
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createViewSQL = format(
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'CREATE OR REPLACE VIEW %1$s AS' ||
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'(' ||
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' SELECT %2$s' ||
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' FROM %3$s' ||
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' WHERE alive = TRUE' ||
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' AND version_id IN' ||
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' (' ||
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' SELECT max(vt.version_id) AS history_id' ||
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' FROM %3$s AS vt' ||
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' JOIN tx_context as txc ON vt.context_id = txc.contextid' ||
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' WHERE txc.txtimestamp <= current_setting(''hsadminng.historical_timestamp'')::timestamp' ||
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' GROUP BY context_id' ||
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' )' ||
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')',
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viewName, baseCols, versionsTable
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);
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RAISE NOTICE 'sql: %', createViewSQL;
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EXECUTE createViewSQL;
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createTriggerSQL = 'CREATE TRIGGER ' || baseTable || '_historicize_tg' ||
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' AFTER INSERT OR DELETE OR UPDATE ON ' || baseTable ||
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' FOR EACH ROW EXECUTE PROCEDURE tx_historicize_tf()';
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RAISE NOTICE 'sql: %', createTriggerSQL;
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EXECUTE createTriggerSQL;
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END; $$;
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call tx_create_historicization('hs_hosting_asset');
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ROLLBACK;
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BEGIN TRANSACTION;
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call defineContext('historization testing', null, 'superuser-alex@hostsharing.net',
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'hs_booking_project#D-1000000-hshdefaultproject:ADMIN');
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-- 'hs_booking_project#D-1000300-mihdefaultproject:ADMIN');
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update hs_hosting_asset set caption='lug00 a' where identifier='lug00' and type='MANAGED_WEBSPACE';
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COMMIT;
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SET hsadminng.historical_timestamp TO '2022-07-12 11:38:27.723315';
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SELECT * FROM hs_hosting_asset_ex p WHERE identifier = 'lug00';
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@ -11,6 +11,8 @@ drop type if exists tx_operation;
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-- Historization
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-- --------------------------------------------------------
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-- FIXME: Liquibase-integration
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create type "tx_operation" as enum ('INSERT', 'UPDATE', 'DELETE', 'TRUNCATE');
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create or replace function tx_historicize_tf()
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Loading…
Reference in New Issue
Block a user