215 lines
8.3 KiB
Python
215 lines
8.3 KiB
Python
from __future__ import unicode_literals
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import uuid
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from django.conf import settings
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from django.db.backends.base.operations import BaseDatabaseOperations
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from django.utils import six, timezone
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from django.utils.encoding import force_text
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class DatabaseOperations(BaseDatabaseOperations):
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compiler_module = "django.db.backends.mysql.compiler"
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# MySQL stores positive fields as UNSIGNED ints.
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integer_field_ranges = dict(BaseDatabaseOperations.integer_field_ranges,
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PositiveSmallIntegerField=(0, 4294967295),
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PositiveIntegerField=(0, 18446744073709551615),
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)
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def date_extract_sql(self, lookup_type, field_name):
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# http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html
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if lookup_type == 'week_day':
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# DAYOFWEEK() returns an integer, 1-7, Sunday=1.
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# Note: WEEKDAY() returns 0-6, Monday=0.
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return "DAYOFWEEK(%s)" % field_name
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else:
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return "EXTRACT(%s FROM %s)" % (lookup_type.upper(), field_name)
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def date_trunc_sql(self, lookup_type, field_name):
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fields = ['year', 'month', 'day', 'hour', 'minute', 'second']
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format = ('%%Y-', '%%m', '-%%d', ' %%H:', '%%i', ':%%s') # Use double percents to escape.
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format_def = ('0000-', '01', '-01', ' 00:', '00', ':00')
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try:
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i = fields.index(lookup_type) + 1
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except ValueError:
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sql = field_name
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else:
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format_str = ''.join([f for f in format[:i]] + [f for f in format_def[i:]])
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sql = "CAST(DATE_FORMAT(%s, '%s') AS DATETIME)" % (field_name, format_str)
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return sql
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def datetime_extract_sql(self, lookup_type, field_name, tzname):
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if settings.USE_TZ:
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field_name = "CONVERT_TZ(%s, 'UTC', %%s)" % field_name
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params = [tzname]
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else:
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params = []
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# http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html
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if lookup_type == 'week_day':
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# DAYOFWEEK() returns an integer, 1-7, Sunday=1.
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# Note: WEEKDAY() returns 0-6, Monday=0.
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sql = "DAYOFWEEK(%s)" % field_name
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else:
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sql = "EXTRACT(%s FROM %s)" % (lookup_type.upper(), field_name)
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return sql, params
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def datetime_trunc_sql(self, lookup_type, field_name, tzname):
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if settings.USE_TZ:
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field_name = "CONVERT_TZ(%s, 'UTC', %%s)" % field_name
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params = [tzname]
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else:
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params = []
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fields = ['year', 'month', 'day', 'hour', 'minute', 'second']
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format = ('%%Y-', '%%m', '-%%d', ' %%H:', '%%i', ':%%s') # Use double percents to escape.
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format_def = ('0000-', '01', '-01', ' 00:', '00', ':00')
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try:
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i = fields.index(lookup_type) + 1
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except ValueError:
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sql = field_name
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else:
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format_str = ''.join([f for f in format[:i]] + [f for f in format_def[i:]])
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sql = "CAST(DATE_FORMAT(%s, '%s') AS DATETIME)" % (field_name, format_str)
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return sql, params
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def date_interval_sql(self, timedelta):
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return "INTERVAL '%d 0:0:%d:%d' DAY_MICROSECOND" % (
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timedelta.days, timedelta.seconds, timedelta.microseconds), []
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def format_for_duration_arithmetic(self, sql):
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if self.connection.features.supports_microsecond_precision:
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return 'INTERVAL %s MICROSECOND' % sql
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else:
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return 'INTERVAL FLOOR(%s / 1000000) SECOND' % sql
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def drop_foreignkey_sql(self):
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return "DROP FOREIGN KEY"
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def force_no_ordering(self):
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"""
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"ORDER BY NULL" prevents MySQL from implicitly ordering by grouped
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columns. If no ordering would otherwise be applied, we don't want any
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implicit sorting going on.
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"""
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return [(None, ("NULL", [], False))]
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def fulltext_search_sql(self, field_name):
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return 'MATCH (%s) AGAINST (%%s IN BOOLEAN MODE)' % field_name
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def last_executed_query(self, cursor, sql, params):
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# With MySQLdb, cursor objects have an (undocumented) "_last_executed"
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# attribute where the exact query sent to the database is saved.
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# See MySQLdb/cursors.py in the source distribution.
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return force_text(getattr(cursor, '_last_executed', None), errors='replace')
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def no_limit_value(self):
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# 2**64 - 1, as recommended by the MySQL documentation
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return 18446744073709551615
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def quote_name(self, name):
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if name.startswith("`") and name.endswith("`"):
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return name # Quoting once is enough.
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return "`%s`" % name
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def random_function_sql(self):
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return 'RAND()'
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def sql_flush(self, style, tables, sequences, allow_cascade=False):
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# NB: The generated SQL below is specific to MySQL
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# 'TRUNCATE x;', 'TRUNCATE y;', 'TRUNCATE z;'... style SQL statements
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# to clear all tables of all data
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if tables:
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sql = ['SET FOREIGN_KEY_CHECKS = 0;']
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for table in tables:
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sql.append('%s %s;' % (
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style.SQL_KEYWORD('TRUNCATE'),
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style.SQL_FIELD(self.quote_name(table)),
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))
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sql.append('SET FOREIGN_KEY_CHECKS = 1;')
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sql.extend(self.sequence_reset_by_name_sql(style, sequences))
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return sql
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else:
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return []
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def validate_autopk_value(self, value):
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# MySQLism: zero in AUTO_INCREMENT field does not work. Refs #17653.
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if value == 0:
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raise ValueError('The database backend does not accept 0 as a '
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'value for AutoField.')
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return value
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def value_to_db_datetime(self, value):
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if value is None:
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return None
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# MySQL doesn't support tz-aware datetimes
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if timezone.is_aware(value):
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if settings.USE_TZ:
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value = value.astimezone(timezone.utc).replace(tzinfo=None)
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else:
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raise ValueError("MySQL backend does not support timezone-aware datetimes when USE_TZ is False.")
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if not self.connection.features.supports_microsecond_precision:
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value = value.replace(microsecond=0)
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return six.text_type(value)
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def value_to_db_time(self, value):
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if value is None:
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return None
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# MySQL doesn't support tz-aware times
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if timezone.is_aware(value):
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raise ValueError("MySQL backend does not support timezone-aware times.")
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return six.text_type(value)
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def max_name_length(self):
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return 64
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def bulk_insert_sql(self, fields, num_values):
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items_sql = "(%s)" % ", ".join(["%s"] * len(fields))
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return "VALUES " + ", ".join([items_sql] * num_values)
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def combine_expression(self, connector, sub_expressions):
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"""
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MySQL requires special cases for ^ operators in query expressions
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"""
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if connector == '^':
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return 'POW(%s)' % ','.join(sub_expressions)
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return super(DatabaseOperations, self).combine_expression(connector, sub_expressions)
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def get_db_converters(self, expression):
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converters = super(DatabaseOperations, self).get_db_converters(expression)
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internal_type = expression.output_field.get_internal_type()
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if internal_type == 'TextField':
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converters.append(self.convert_textfield_value)
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elif internal_type in ['BooleanField', 'NullBooleanField']:
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converters.append(self.convert_booleanfield_value)
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elif internal_type == 'DateTimeField':
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converters.append(self.convert_datetimefield_value)
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elif internal_type == 'UUIDField':
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converters.append(self.convert_uuidfield_value)
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return converters
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def convert_textfield_value(self, value, expression, connection, context):
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if value is not None:
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value = force_text(value)
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return value
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def convert_booleanfield_value(self, value, expression, connection, context):
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if value in (0, 1):
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value = bool(value)
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return value
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def convert_datetimefield_value(self, value, expression, connection, context):
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if value is not None:
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if settings.USE_TZ:
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value = value.replace(tzinfo=timezone.utc)
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return value
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def convert_uuidfield_value(self, value, expression, connection, context):
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if value is not None:
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value = uuid.UUID(value)
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return value
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