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File Name : schema.py

# MySQL Connector/Python - MySQL driver written in Python.

# New file added for Django 1.7

import django
if django.VERSION >= (1, 8):
    from django.db.backends.base.schema import BaseDatabaseSchemaEditor
else:
    from django.db.backends.schema import BaseDatabaseSchemaEditor
from django.db.models import NOT_PROVIDED

class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):

sql_rename_table = "RENAME TABLE %(old_table)s TO %(new_table)s"

sql_alter_column_null = "MODIFY %(column)s %(type)s NULL"
    sql_alter_column_not_null = "MODIFY %(column)s %(type)s NOT NULL"
    sql_alter_column_type = "MODIFY %(column)s %(type)s"
    sql_rename_column = "ALTER TABLE %(table)s CHANGE %(old_column)s " \
                        "%(new_column)s %(type)s"

sql_delete_unique = "ALTER TABLE %(table)s DROP INDEX %(name)s"

sql_create_fk = "ALTER TABLE %(table)s ADD CONSTRAINT %(name)s FOREIGN " \
                    "KEY (%(column)s) REFERENCES %(to_table)s (%(to_column)s)"
    sql_delete_fk = "ALTER TABLE %(table)s DROP FOREIGN KEY %(name)s"

sql_delete_index = "DROP INDEX %(name)s ON %(table)s"

alter_string_set_null = 'MODIFY %(column)s %(type)s NULL;'
    alter_string_drop_null = 'MODIFY %(column)s %(type)s NOT NULL;'

sql_create_pk = "ALTER TABLE %(table)s ADD CONSTRAINT %(name)s " \
                    "PRIMARY KEY (%(columns)s)"
    sql_delete_pk = "ALTER TABLE %(table)s DROP PRIMARY KEY"

def quote_value(self, value):
        # Inner import to allow module to fail to load gracefully
        from mysql.connector.conversion import MySQLConverter
        return MySQLConverter.quote(MySQLConverter.escape(value))

def skip_default(self, field):
        """
        MySQL doesn't accept default values for longtext and longblob
        and implicitly treats these columns as nullable.
        """
        return field.db_type(self.connection) in ('longtext', 'longblob')

def add_field(self, model, field):
        super(DatabaseSchemaEditor, self).add_field(model, field)

# Simulate the effect of a one-off default.
        if (self.skip_default(field)
                and field.default not in (None, NOT_PROVIDED)):
            effective_default = self.effective_default(field)
            self.execute('UPDATE %(table)s SET %(column)s = %%s' % {
                'table': self.quote_name(model._meta.db_table),
                'column': self.quote_name(field.column),
            }, [effective_default])

def _model_indexes_sql(self, model):
        # New in Django 1.8
        storage = self.connection.introspection.get_storage_engine(
            self.connection.cursor(), model._meta.db_table
        )
        if storage == "InnoDB":
            for field in model._meta.local_fields:
                if (field.db_index and not field.unique
                        and field.get_internal_type() == "ForeignKey"):
                    # Temporary setting db_index to False (in memory) to
                    # disable index creation for FKs (index automatically
                    # created by MySQL)
                    field.db_index = False
        return super(DatabaseSchemaEditor, self)._model_indexes_sql(model)

def _alter_column_type_sql(self, table, old_field, new_field, new_type):
        # New in Django 1.8
        # Keep null property of old field, if it has changed, it will be
        # handled separately
        if old_field.null:
            new_type += " NULL"
        else:
            new_type += " NOT NULL"
        return super(DatabaseSchemaEditor, self)._alter_column_type_sql(
            table, old_field, new_field, new_type)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-04-04 08:10:15
..	dir	-	root/root	0755	2025-04-04 08:10:14
__pycache__	dir	-	root/root	0755	2025-04-04 08:10:15
__init__.py	application/x-empty	0 B	root/root	0644	2025-04-04 08:10:14
base.py	text/x-script.python	20.14 KB	root/root	0644	2025-04-04 08:10:14
client.py	text/x-script.python	1.84 KB	root/root	0644	2025-04-04 08:10:14
compiler.py	text/x-script.python	1.96 KB	root/root	0644	2025-04-04 08:10:14
creation.py	text/x-script.python	5.63 KB	root/root	0644	2025-04-04 08:10:14
features.py	text/x-script.python	4.23 KB	root/root	0644	2025-04-04 08:10:14
introspection.py	text/x-script.python	13.1 KB	root/root	0644	2025-04-04 08:10:14
operations.py	text/x-script.python	11.52 KB	root/root	0644	2025-04-04 08:10:14
schema.py	text/x-script.python	3.55 KB	root/root	0644	2025-04-04 08:10:14
validation.py	text/x-script.python	2.54 KB	root/root	0644	2025-04-04 08:10:14

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