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# coding: utf-8
# Copyright 2014-2025 Álvaro Justen <https://github.com/turicas/rows/>
# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General
# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option)
# any later version.
# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
# more details.
# You should have received a copy of the GNU Lesser General Public License along with this program. If not, see
# <http://www.gnu.org/licenses/>.
from __future__ import unicode_literals
import datetime
import MySQLdb
from .rows import Table
from .utils import ipartition, slug
__all__ = ["import_from_mysql", "export_to_mysql"]
# TODO: replace 'None' with '' on export_to_*
# TODO: need converters in and out
# TODO: lazy=True|False
# TODO: datetime.time on MYSQL_TYPE
# TODO: import from mysql
# TODO: logging?
# TODO: _mysql_exceptions.OperationalError: (2006, 'MySQL server has gone #
# away')
MYSQL_TYPE = {
str: "TEXT",
int: "INT",
float: "FLOAT",
datetime.date: "DATE",
datetime.datetime: "DATETIME",
bool: "BOOL",
}
# 'BOOL' on MySQL is a shortcut to TINYINT(1)
MYSQLDB_TYPE = {
getattr(MySQLdb.FIELD_TYPE, x): x
for x in dir(MySQLdb.FIELD_TYPE)
if not x.startswith("_")
}
MYSQLDB_TO_PYTHON = {
"ENUM": str,
"STRING": str,
"VAR_STRING": str,
"BLOB": bytes,
"LONG_BLOB": bytes,
"MEDIUM_BLOB": bytes,
"TINY_BLOB": bytes,
"DECIMAL": float,
"DOUBLE": float,
"FLOAT": float,
"INT24": int,
"LONG": int,
"LONGLONG": int,
"TINY": int,
"YEAR": int,
"DATE": datetime.date,
"NEWDATE": datetime.date,
"TIME": int,
"TIMESTAMP": int,
"DATETIME": datetime.datetime,
}
def _get_mysql_config(connection_str):
colon_index = connection_str.index(":")
at_index = connection_str.index("@")
slash_index = connection_str.index("/")
config = {}
config["user"] = connection_str[:colon_index]
config["passwd"] = connection_str[colon_index + 1 : at_index]
config["host"] = connection_str[at_index + 1 : slash_index]
config["port"] = 3306
if ":" in config["host"]:
data = config["host"].split(":")
config["host"] = data[0]
config["port"] = int(data[1])
if connection_str.count("/") == 1:
table_name = None
config["db"] = connection_str[slash_index + 1 :]
else:
second_slash_index = connection_str.index("/", slash_index + 1)
config["db"] = connection_str[slash_index + 1 : second_slash_index]
table_name = connection_str[second_slash_index + 1 :]
return config, table_name
def _connect_to_mysql(config):
return MySQLdb.connect(**config)
def import_from_mysql(connection_string, limit=None, order_by=None, query=""):
# TODO: add 'lazy' option
config, table_name = _get_mysql_config(connection_string)
connection = _connect_to_mysql(config)
cursor = connection.cursor()
if query:
sql = query
else:
sql = "SELECT * FROM " + table_name
if limit is not None:
sql += " LIMIT {0[0]}, {0[1]}".format(limit)
if order_by is not None:
sql += " ORDER BY " + order_by
cursor.execute(sql)
column_info = [(x[0], x[1]) for x in cursor.description]
table = Table(fields=[x[0] for x in cursor.description])
table.types = {
name: MYSQLDB_TO_PYTHON[MYSQLDB_TYPE[type_]] for name, type_ in column_info
}
table_rows = [list(row) for row in cursor.fetchall()]
encoding = connection.character_set_name()
for row in table_rows:
for column_index, value in enumerate(row):
if type(value) is str:
row[column_index] = value.decode(encoding)
table._rows = table_rows
cursor.close()
connection.close()
return table
def export_to_mysql(
table,
connection_string,
encoding=None,
batch_size=1000,
commit_every=10000,
callback=None,
callback_every=10000,
):
config, table_name = _get_mysql_config(connection_string)
connection = _connect_to_mysql(config)
cursor = connection.cursor()
# Create table
fields, types = table.fields, table.types
field_slugs = [slug(field) for field in fields]
field_types = [MYSQL_TYPE[types[field]] for field in fields]
columns_definition = [
"{} {}".format(field, type_) for field, type_ in zip(field_slugs, field_types)
]
sql = "CREATE TABLE IF NOT EXISTS {} ({})".format(
table_name, ", ".join(columns_definition)
)
cursor.execute(sql)
# Insert items
columns = ", ".join(field_slugs)
# placeholders = ['%s' if types[field] in (int, float, bool) else '"%s"'
# for field in fields]
# TODO: fix this string/formatting problem
placeholders = ["%s" for field in fields]
sql = "INSERT INTO {} ({}) VALUES ({})".format(
table_name, columns, ", ".join(placeholders)
)
total = last_commit = last_callback = 0
for rows in ipartition(iter(table), batch_size):
values = [[row[field] for field in fields] for row in rows]
added = len(values)
total += added
last_commit += added
last_callback += added
cursor.executemany(sql, values)
if last_commit >= commit_every:
connection.commit()
last_commit = 0
if callback is not None and last_callback >= callback_every:
callback(total)
last_callback = 0
if callback is not None and last_callback > 0:
callback(total)
if last_commit > 0:
connection.commit()
connection.close()
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