ScoDoc/app/models/raw_sql_init.py

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# -*- coding: UTF-8 -*
"""
Create some Postgresql sequences and functions used by ScoDoc
using raw SQL
"""
from app import db
def create_database_functions(): # XXX obsolete
"""Create specific SQL functions and sequences
XXX Obsolete: cette fonction est dans la première migration 9.0.3
Flask-Migrate fait maintenant (dans les versions >= 9.0.4) ce travail.
"""
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# Important: toujours utiliser IF NOT EXISTS
# car cette fonction peut être appelée plusieurs fois sur la même db
db.session.execute(
"""
CREATE SEQUENCE IF NOT EXISTS notes_idgen_fcod;
CREATE OR REPLACE FUNCTION notes_newid_fcod() RETURNS TEXT
AS $$ SELECT 'FCOD' || to_char(nextval('notes_idgen_fcod'), 'FM999999999'); $$
LANGUAGE SQL;
CREATE OR REPLACE FUNCTION notes_newid_ucod() RETURNS TEXT
AS $$ SELECT 'UCOD' || to_char(nextval('notes_idgen_fcod'), 'FM999999999'); $$
LANGUAGE SQL;
CREATE OR REPLACE FUNCTION truncate_tables(username IN VARCHAR) RETURNS void AS $$
DECLARE
statements CURSOR FOR
SELECT tablename FROM pg_tables
WHERE tableowner = username AND schemaname = 'public'
AND tablename <> 'notes_semestres'
AND tablename <> 'notes_form_modalites'
AND tablename <> 'alembic_version';
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BEGIN
FOR stmt IN statements LOOP
EXECUTE 'TRUNCATE TABLE ' || quote_ident(stmt.tablename) || ' CASCADE;';
END LOOP;
END;
$$ LANGUAGE plpgsql;
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-- Fonction pour anonymisation:
-- inspirée par https://www.simononsoftware.com/random-string-in-postgresql/
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CREATE OR REPLACE FUNCTION random_text_md5( integer ) returns text
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LANGUAGE SQL
AS $$
select upper( substring( (SELECT string_agg(md5(random()::TEXT), '')
FROM generate_series(
1,
CEIL($1 / 32.)::integer)
), 1, $1) );
$$;
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"""
)
db.session.commit()