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Current File : /opt/hc_python/lib64/python3.12/site-packages/mysql/connector/django/operations.py
# 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

Youez - 2016 - github.com/yon3zu
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