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# MySQL Connector/Python - MySQL driver written in Python.
# New file added for Django 1.8
from __future__ import unicode_literals
import uuid
import django
from django.conf import settings
if django.VERSION >= (1, 8):
from django.db.backends.base.operations import BaseDatabaseOperations
else:
from django.db.backends import BaseDatabaseOperations
from django.utils import six, timezone
from django.utils.encoding import force_text
try:
from _mysql_connector import datetime_to_mysql, time_to_mysql
except ImportError:
HAVE_CEXT = False
else:
HAVE_CEXT = True
class DatabaseOperations(BaseDatabaseOperations):
compiler_module = "mysql.connector.django.compiler"
# MySQL stores positive fields as UNSIGNED ints.
if django.VERSION >= (1, 7):
integer_field_ranges = dict(BaseDatabaseOperations.integer_field_ranges,
PositiveSmallIntegerField=(0, 4294967295),
PositiveIntegerField=(
0, 18446744073709551615),)
def date_extract_sql(self, lookup_type, field_name):
# http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html
if lookup_type == 'week_day':
# DAYOFWEEK() returns an integer, 1-7, Sunday=1.
# Note: WEEKDAY() returns 0-6, Monday=0.
return "DAYOFWEEK({0})".format(field_name)
else:
return "EXTRACT({0} FROM {1})".format(
lookup_type.upper(), field_name)
def date_trunc_sql(self, lookup_type, field_name):
"""Returns SQL simulating DATE_TRUNC
This function uses MySQL functions DATE_FORMAT and CAST to
simulate DATE_TRUNC.
The field_name is returned when lookup_type is not supported.
"""
fields = ['year', 'month', 'day', 'hour', 'minute', 'second']
format = ('%Y-', '%m', '-%d', ' %H:', '%i', ':%S')
format_def = ('0000-', '01', '-01', ' 00:', '00', ':00')
try:
i = fields.index(lookup_type) + 1
except ValueError:
# Wrong lookup type, just return the value from MySQL as-is
sql = field_name
else:
format_str = ''.join([f for f in format[:i]] +
[f for f in format_def[i:]])
sql = "CAST(DATE_FORMAT({0}, '{1}') AS DATETIME)".format(
field_name, format_str)
return sql
def datetime_extract_sql(self, lookup_type, field_name, tzname):
# Django 1.6
if settings.USE_TZ:
field_name = "CONVERT_TZ({0}, 'UTC', %s)".format(field_name)
params = [tzname]
else:
params = []
# http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html
if lookup_type == 'week_day':
# DAYOFWEEK() returns an integer, 1-7, Sunday=1.
# Note: WEEKDAY() returns 0-6, Monday=0.
sql = "DAYOFWEEK({0})".format(field_name)
else:
sql = "EXTRACT({0} FROM {1})".format(lookup_type.upper(),
field_name)
return sql, params
def datetime_trunc_sql(self, lookup_type, field_name, tzname):
# Django 1.6
if settings.USE_TZ:
field_name = "CONVERT_TZ({0}, 'UTC', %s)".format(field_name)
params = [tzname]
else:
params = []
fields = ['year', 'month', 'day', 'hour', 'minute', 'second']
format_ = ('%Y-', '%m', '-%d', ' %H:', '%i', ':%S')
format_def = ('0000-', '01', '-01', ' 00:', '00', ':00')
try:
i = fields.index(lookup_type) + 1
except ValueError:
sql = field_name
else:
format_str = ''.join([f for f in format_[:i]] +
[f for f in format_def[i:]])
sql = "CAST(DATE_FORMAT({0}, '{1}') AS DATETIME)".format(
field_name, format_str)
return sql, params
if django.VERSION >= (1, 8):
def date_interval_sql(self, timedelta):
"""Returns SQL for calculating date/time intervals
"""
return "INTERVAL '%d 0:0:%d:%d' DAY_MICROSECOND" % (
timedelta.days, timedelta.seconds, timedelta.microseconds), []
else:
def date_interval_sql(self, sql, connector, timedelta):
"""Returns SQL for calculating date/time intervals
"""
fmt = (
"({sql} {connector} INTERVAL '{days} "
"0:0:{secs}:{msecs}' DAY_MICROSECOND)"
)
return fmt.format(
sql=sql,
connector=connector,
days=timedelta.days,
secs=timedelta.seconds,
msecs=timedelta.microseconds
)
def format_for_duration_arithmetic(self, sql):
if self.connection.features.supports_microsecond_precision:
return 'INTERVAL %s MICROSECOND' % sql
else:
return 'INTERVAL FLOOR(%s / 1000000) SECOND' % sql
def drop_foreignkey_sql(self):
return "DROP FOREIGN KEY"
def force_no_ordering(self):
"""
"ORDER BY NULL" prevents MySQL from implicitly ordering by grouped
columns. If no ordering would otherwise be applied, we don't want any
implicit sorting going on.
"""
if django.VERSION >= (1, 8):
return [(None, ("NULL", [], False))]
else:
return ["NULL"]
def fulltext_search_sql(self, field_name):
return 'MATCH ({0}) AGAINST (%s IN BOOLEAN MODE)'.format(field_name)
def last_executed_query(self, cursor, sql, params):
return force_text(cursor.statement, errors='replace')
def no_limit_value(self):
# 2**64 - 1, as recommended by the MySQL documentation
return 18446744073709551615
def quote_name(self, name):
if name.startswith("`") and name.endswith("`"):
return name # Quoting once is enough.
return "`{0}`".format(name)
def random_function_sql(self):
return 'RAND()'
def sql_flush(self, style, tables, sequences, allow_cascade=False):
if tables:
sql = ['SET FOREIGN_KEY_CHECKS = 0;']
for table in tables:
sql.append('{keyword} {table};'.format(
keyword=style.SQL_KEYWORD('TRUNCATE'),
table=style.SQL_FIELD(self.quote_name(table))))
sql.append('SET FOREIGN_KEY_CHECKS = 1;')
sql.extend(self.sequence_reset_by_name_sql(style, sequences))
return sql
else:
return []
def validate_autopk_value(self, value):
# MySQLism: zero in AUTO_INCREMENT field does not work. Refs #17653.
if value == 0:
raise ValueError('The database backend does not accept 0 as a '
'value for AutoField.')
return value
def value_to_db_datetime(self, value):
if value is None:
return None
# MySQL doesn't support tz-aware times
if timezone.is_aware(value):
if settings.USE_TZ:
value = value.astimezone(timezone.utc).replace(tzinfo=None)
else:
raise ValueError(
"MySQL backend does not support timezone-aware times."
)
if not self.connection.features.supports_microsecond_precision:
value = value.replace(microsecond=0)
if not self.connection.use_pure:
return datetime_to_mysql(value)
return self.connection.converter.to_mysql(value)
def value_to_db_time(self, value):
if value is None:
return None
# MySQL doesn't support tz-aware times
if timezone.is_aware(value):
raise ValueError("MySQL backend does not support timezone-aware "
"times.")
if not self.connection.use_pure:
return time_to_mysql(value)
return self.connection.converter.to_mysql(value)
def max_name_length(self):
return 64
def bulk_insert_sql(self, fields, num_values):
items_sql = "({0})".format(", ".join(["%s"] * len(fields)))
return "VALUES " + ", ".join([items_sql] * num_values)
if django.VERSION < (1, 8):
def year_lookup_bounds(self, value):
# Again, no microseconds
first = '{0}-01-01 00:00:00'
second = '{0}-12-31 23:59:59.999999'
return [first.format(value), second.format(value)]
def year_lookup_bounds_for_datetime_field(self, value):
# Django 1.6
# Again, no microseconds
first, second = super(DatabaseOperations,
self).year_lookup_bounds_for_datetime_field(value)
if self.connection.mysql_version >= (5, 6, 4):
return [first.replace(microsecond=0), second]
else:
return [first.replace(microsecond=0),
second.replace(microsecond=0)]
def sequence_reset_by_name_sql(self, style, sequences):
# Truncate already resets the AUTO_INCREMENT field from
# MySQL version 5.0.13 onwards. Refs #16961.
res = []
if self.connection.mysql_version < (5, 0, 13):
fmt = "{alter} {table} {{tablename}} {auto_inc} {field};".format(
alter=style.SQL_KEYWORD('ALTER'),
table=style.SQL_KEYWORD('TABLE'),
auto_inc=style.SQL_KEYWORD('AUTO_INCREMENT'),
field=style.SQL_FIELD('= 1')
)
for sequence in sequences:
tablename = style.SQL_TABLE(self.quote_name(sequence['table']))
res.append(fmt.format(tablename=tablename))
return res
return res
def savepoint_create_sql(self, sid):
return "SAVEPOINT {0}".format(sid)
def savepoint_commit_sql(self, sid):
return "RELEASE SAVEPOINT {0}".format(sid)
def savepoint_rollback_sql(self, sid):
return "ROLLBACK TO SAVEPOINT {0}".format(sid)
def combine_expression(self, connector, sub_expressions):
"""
MySQL requires special cases for ^ operators in query expressions
"""
if connector == '^':
return 'POW(%s)' % ','.join(sub_expressions)
return super(DatabaseOperations, self).combine_expression(
connector, sub_expressions)
def get_db_converters(self, expression):
# New in Django 1.8
converters = super(DatabaseOperations, self).get_db_converters(
expression)
internal_type = expression.output_field.get_internal_type()
if internal_type in ['BooleanField', 'NullBooleanField']:
converters.append(self.convert_booleanfield_value)
if internal_type == 'UUIDField':
converters.append(self.convert_uuidfield_value)
if internal_type == 'TextField':
converters.append(self.convert_textfield_value)
return converters
def convert_booleanfield_value(self, value,
expression, connection, context):
# New in Django 1.8
if value in (0, 1):
value = bool(value)
return value
def convert_uuidfield_value(self, value, expression, connection, context):
# New in Django 1.8
if value is not None:
value = uuid.UUID(value)
return value
def convert_textfield_value(self, value, expression, connection, context):
# New in Django 1.8
if value is not None:
value = force_text(value)
return value
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