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Migrate mysql encoding by default to utf8mb4 and utf8mb4_unicode_ci
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#!/usr/bin/env python | |
# -*- coding: UTF-8 -*- | |
import getpass | |
import _mysql | |
import argparse | |
def execute(conn, query): | |
conn.query(query) | |
result = conn.store_result() | |
if result: | |
return result.fetch_row(maxrows=0, how=1) | |
return result | |
def start(host, port, user, passwd, db, charset, encoding): | |
script = """ """ | |
conn = _mysql.connect(user=user, passwd=passwd, host=host, port=port, db=db) | |
# first we alter database | |
q = """ALTER DATABASE `{database}` CHARACTER SET = {charset} COLLATE = {encoding};\r\n""".format(**{ | |
'database': db, | |
'charset': charset, | |
'encoding': encoding, | |
}) | |
script += q | |
# retreive table names | |
q = """SELECT T.table_name FROM information_schema.`TABLES` T WHERE T.table_schema = '{}'\r\n""".format(db) | |
result = execute(conn=conn, query=q) | |
tablenames = [r['table_name'] for r in result] | |
# alter each table name | |
for t in tablenames: | |
q = """ALTER TABLE `{table_name}` CONVERT TO CHARACTER SET {charset} COLLATE {encoding};\r\n""".format(**{ | |
'table_name': t, | |
'charset': charset, | |
'encoding': encoding, | |
}) | |
script += q | |
# retreive and convert each column | |
for t in tablenames: | |
q = """ SHOW FULL COLUMNS FROM {}""".format(t) | |
columns = execute(conn=conn, query=q) | |
# for each column check format and alter it | |
for col in columns: | |
if col['Collation'] is not None: | |
print('before : {} {} {} {} default {}'.format(t, col['Field'], col['Type'], col['Collation'], col['Default'])) | |
default = None | |
if col['Default'] is None: | |
default = 'NULL' | |
else: | |
default = "'{}'".format(col['Default']) | |
q = """ALTER TABLE `{table_name}` CHANGE `{column_name}` `{column_name}` | |
{column_type} CHARACTER SET {charset} COLLATE {encoding} DEFAULT {default};\r\n | |
""".format(**{ | |
'table_name': t, | |
'column_name': col['Field'], | |
'column_type': col['Type'], | |
'charset': charset, | |
'encoding': encoding, | |
'default': default | |
}) | |
script += q | |
with open('migrate.sql', 'wb') as f: | |
f.write(script) | |
print("success") | |
if __name__ == '__main__': | |
a = argparse.ArgumentParser(description="Migrate MYSQL encoding SQL script generator") | |
a.add_argument("-H", "--host", help="MYSQL database host", required=True) | |
a.add_argument("-p", "--port", help="MYSQL database port", nargs='?', const=3306, type=int, default=3306) | |
a.add_argument("-u", "--user", help="MYSQL database username", required=True) | |
a.add_argument("-d", "--db", help="MYSQL database name", required=True) | |
a.add_argument("-c", "--charset", help="MYSQL charset name", required=False, default='utf8mb4') | |
a.add_argument("-e", "--encoding", help="MYSQL table field encoding", required=False, default='utf8mb4_unicode_ci') | |
args = a.parse_args() | |
display = """ | |
host {host} | |
port {port} | |
database {db} | |
username {user} | |
charset {charset} | |
encoding {encoding} | |
""".format(**vars(args)) | |
print(display) | |
args.passwd = getpass.getpass() | |
start(**vars(args)) |
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