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example-datamigration.py
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example-datamigration.py
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import pymysql
from sql_schema_builder.SQLSchemaBuilder import SQLSchemaBuilder
# Database which schema we control.
class DatabasePremierLeague():
@classmethod
def _get_schema(cls):
schema = {}
schema_version = 1.020
schema['teams'] = """
id_team I NOTNULL DEFAULT 0,
name C(32),
points I,
matches_won I,
matches_drawn I,
matches_lost I,
total_goals I,
coach_name C(64),
timestamp_updated I8,
INDEX PRIMARY (id_team),
INDEX (timestamp_updated)
"""
schema['players'] = """
id_player I NOTNULL DEFAULT 0,
name C(64),
id_team I,
shirt_number I,
position ENUM('', 'goalkeeper', 'defender', 'midfielder', 'forward') DEFAULT '',
goals_scored I,
height I,
weight F,
INDEX PRIMARY (id_player),
INDEX (id_team, id_player)
"""
return schema, schema_version
@classmethod
def _migrate_schema(cls, db_schema_version, cursor):
if db_schema_version < 1.020:
sql = """SELECT id_team, SUM(goals_scored) FROM players GROUP BY id_team"""
cursor.execute(sql)
rows = cursor.fetchall()
for row in rows:
sql = """UPDATE teams SET total_goals = %s WHERE id_team = %s AND total_goals IS NULL"""
cursor.execute(sql, (row[1], row[0]))
conn = pymysql.connect(host='localhost', user='root', passwd='xxx', db='premierleague')
db_schema = SQLSchemaBuilder(pymysql_conn=conn)
db_schema.UpdateSchema(*DatabasePremierLeague._get_schema(), post_migrate_callback=DatabasePremierLeague._migrate_schema)