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Current File : /opt/hc_python/lib64/python3.12/site-packages/mysql/connector/django/introspection.py
# MySQL Connector/Python - MySQL driver written in Python.


import re
from collections import namedtuple

import django
if django.VERSION >= (1, 8):
    from django.db.backends.base.introspection import (
        BaseDatabaseIntrospection, FieldInfo, TableInfo
    )
else:
    from django.db.backends import BaseDatabaseIntrospection

if django.VERSION >= (1, 6):
    if django.VERSION < (1, 8):
        from django.db.backends import FieldInfo
    from django.utils.encoding import force_text
    if django.VERSION >= (1, 7):
        from django.utils.datastructures import OrderedSet

from mysql.connector.constants import FieldType

foreign_key_re = re.compile(r"\sCONSTRAINT `[^`]*` FOREIGN KEY \(`([^`]*)`\) "
                            r"REFERENCES `([^`]*)` \(`([^`]*)`\)")

if django.VERSION >= (1, 8):
    FieldInfo = namedtuple('FieldInfo', FieldInfo._fields + ('extra',))


class DatabaseIntrospection(BaseDatabaseIntrospection):
    data_types_reverse = {
        FieldType.BLOB: 'TextField',
        FieldType.DECIMAL: 'DecimalField',
        FieldType.NEWDECIMAL: 'DecimalField',
        FieldType.DATE: 'DateField',
        FieldType.DATETIME: 'DateTimeField',
        FieldType.DOUBLE: 'FloatField',
        FieldType.FLOAT: 'FloatField',
        FieldType.INT24: 'IntegerField',
        FieldType.LONG: 'IntegerField',
        FieldType.LONGLONG: 'BigIntegerField',
        FieldType.SHORT: (
            'IntegerField' if django.VERSION < (1, 8) else 'SmallIntegerField'
        ),
        FieldType.STRING: 'CharField',
        FieldType.TIME: 'TimeField',
        FieldType.TIMESTAMP: 'DateTimeField',
        FieldType.TINY: 'IntegerField',
        FieldType.TINY_BLOB: 'TextField',
        FieldType.MEDIUM_BLOB: 'TextField',
        FieldType.LONG_BLOB: 'TextField',
        FieldType.VAR_STRING: 'CharField',
    }

    def get_field_type(self, data_type, description):
        field_type = super(DatabaseIntrospection, self).get_field_type(
            data_type, description)
        if (field_type == 'IntegerField'
                and 'auto_increment' in description.extra):
            return 'AutoField'
        return field_type

    def get_table_list(self, cursor):
        """Returns a list of table names in the current database."""
        cursor.execute("SHOW FULL TABLES")
        if django.VERSION >= (1, 8):
            return [
                TableInfo(row[0], {'BASE TABLE': 't', 'VIEW': 'v'}.get(row[1]))
                for row in cursor.fetchall()
            ]
        else:
            return [row[0] for row in cursor.fetchall()]

    if django.VERSION >= (1, 8):
        def get_table_description(self, cursor, table_name):
            """
            Returns a description of the table, with the DB-API
            cursor.description interface."
            """
            # - information_schema database gives more accurate results for
            #   some figures:
            # - varchar length returned by cursor.description is an internal
            #   length, not visible length (#5725)
            # - precision and scale (for decimal fields) (#5014)
            # - auto_increment is not available in cursor.description
            InfoLine = namedtuple(
                'InfoLine',
                'col_name data_type max_len num_prec num_scale extra'
            )
            cursor.execute("""
                SELECT column_name, data_type, character_maximum_length,
                numeric_precision, numeric_scale, extra
                FROM information_schema.columns
                WHERE table_name = %s AND table_schema = DATABASE()""",
                           [table_name])
            field_info = dict(
                (line[0], InfoLine(*line)) for line in cursor.fetchall()
            )

            cursor.execute("SELECT * FROM %s LIMIT 1"
                           % self.connection.ops.quote_name(table_name))
            to_int = lambda i: int(i) if i is not None else i
            fields = []
            for line in cursor.description:
                col_name = force_text(line[0])
                fields.append(
                    FieldInfo(*((col_name,)
                                + line[1:3]
                                + (to_int(field_info[col_name].max_len)
                                   or line[3],
                                   to_int(field_info[col_name].num_prec)
                                   or line[4],
                                   to_int(field_info[col_name].num_scale)
                                   or line[5])
                                + (line[6],)
                                + (field_info[col_name].extra,)))
                )
            return fields
    else:
        def get_table_description(self, cursor, table_name):
            """
            Returns a description of the table, with the DB-API
            cursor.description interface.
            """
            # varchar length returned by cursor.description is an internal
            # length not visible length (#5725), use information_schema database
            #  to fix this
            cursor.execute(
                "SELECT column_name, character_maximum_length "
                "FROM INFORMATION_SCHEMA.COLUMNS "
                "WHERE table_name = %s AND table_schema = DATABASE() "
                "AND character_maximum_length IS NOT NULL", [table_name])
            length_map = dict(cursor.fetchall())

            # Also getting precision and scale from
            # information_schema (see #5014)
            cursor.execute(
                "SELECT column_name, numeric_precision, numeric_scale FROM "
                "INFORMATION_SCHEMA.COLUMNS WHERE table_name = %s AND "
                "table_schema = DATABASE() AND data_type='decimal'",
                [table_name])
            numeric_map = dict((line[0], tuple([int(n) for n in line[1:]]))
                               for line in cursor.fetchall())

            cursor.execute("SELECT * FROM {0} LIMIT 1".format(
                self.connection.ops.quote_name(table_name)))

            if django.VERSION >= (1, 6):
                return [FieldInfo(*((force_text(line[0]),)
                                    + line[1:3]
                                    + (length_map.get(line[0], line[3]),)
                                    + numeric_map.get(line[0], line[4:6])
                                    + (line[6],)))
                        for line in cursor.description]
            else:
                return [
                    line[:3] + (length_map.get(line[0], line[3]),) + line[4:]
                    for line in cursor.description
                ]

    def _name_to_index(self, cursor, table_name):
        """
        Returns a dictionary of {field_name: field_index} for the given table.
        Indexes are 0-based.
        """
        return dict((d[0], i) for i, d in enumerate(
                    self.get_table_description(cursor, table_name)))

    def get_relations(self, cursor, table_name):
        """
        Returns a dictionary of {field_index: (field_index_other_table,
        other_table)}
        representing all relationships to the given table. Indexes are 0-based.
        """
        constraints = self.get_key_columns(cursor, table_name)
        relations = {}
        if django.VERSION >= (1, 8):
            for my_fieldname, other_table, other_field in constraints:
                relations[my_fieldname] = (other_field, other_table)
            return relations
        else:
            my_field_dict = self._name_to_index(cursor, table_name)
            for my_fieldname, other_table, other_field in constraints:
                other_field_index = self._name_to_index(
                    cursor, other_table)[other_field]
                my_field_index = my_field_dict[my_fieldname]
                relations[my_field_index] = (other_field_index, other_table)
            return relations

    def get_key_columns(self, cursor, table_name):
        """
        Returns a list of (column_name, referenced_table_name,
        referenced_column_name) for all key columns in given table.
        """
        key_columns = []
        cursor.execute(
            "SELECT column_name, referenced_table_name, referenced_column_name "
            "FROM information_schema.key_column_usage "
            "WHERE table_name = %s "
            "AND table_schema = DATABASE() "
            "AND referenced_table_name IS NOT NULL "
            "AND referenced_column_name IS NOT NULL", [table_name])
        key_columns.extend(cursor.fetchall())
        return key_columns

    def get_indexes(self, cursor, table_name):
        cursor.execute("SHOW INDEX FROM {0}"
                       "".format(self.connection.ops.quote_name(table_name)))
        # Do a two-pass search for indexes: on first pass check which indexes
        # are multicolumn, on second pass check which single-column indexes
        # are present.
        rows = list(cursor.fetchall())
        multicol_indexes = set()
        for row in rows:
            if row[3] > 1:
                multicol_indexes.add(row[2])
        indexes = {}
        for row in rows:
            if row[2] in multicol_indexes:
                continue
            if row[4] not in indexes:
                indexes[row[4]] = {'primary_key': False, 'unique': False}
            # It's possible to have the unique and PK constraints in
            # separate indexes.
            if row[2] == 'PRIMARY':
                indexes[row[4]]['primary_key'] = True
            if not row[1]:
                indexes[row[4]]['unique'] = True
        return indexes

    def get_primary_key_column(self, cursor, table_name):
        """
        Returns the name of the primary key column for the given table
        """
        # Django 1.6
        for column in self.get_indexes(cursor, table_name).items():
            if column[1]['primary_key']:
                return column[0]
        return None

    def get_storage_engine(self, cursor, table_name):
        """
        Retrieves the storage engine for a given table. Returns the default
        storage engine if the table doesn't exist.
        """
        cursor.execute(
            "SELECT engine "
            "FROM information_schema.tables "
            "WHERE table_name = %s", [table_name])
        result = cursor.fetchone()
        if not result:
            return self.connection.features.mysql_storage_engine
        return result[0]

    def get_constraints(self, cursor, table_name):
        """
        Retrieves any constraints or keys (unique, pk, fk, check, index) across
        one or more columns.
        """
        # Django 1.7
        constraints = {}
        # Get the actual constraint names and columns
        name_query = (
            "SELECT kc.`constraint_name`, kc.`column_name`, "
            "kc.`referenced_table_name`, kc.`referenced_column_name` "
            "FROM information_schema.key_column_usage AS kc "
            "WHERE "
            "kc.table_schema = %s AND "
            "kc.table_name = %s"
        )
        cursor.execute(name_query, [self.connection.settings_dict['NAME'],
                                    table_name])
        for constraint, column, ref_table, ref_column in cursor.fetchall():
            if constraint not in constraints:
                constraints[constraint] = {
                    'columns': OrderedSet(),
                    'primary_key': False,
                    'unique': False,
                    'index': False,
                    'check': False,
                    'foreign_key': (
                        (ref_table, ref_column) if ref_column else None,
                    )
                }
            constraints[constraint]['columns'].add(column)
        # Now get the constraint types
        type_query = """
            SELECT c.constraint_name, c.constraint_type
            FROM information_schema.table_constraints AS c
            WHERE
                c.table_schema = %s AND
                c.table_name = %s
        """
        cursor.execute(type_query, [self.connection.settings_dict['NAME'],
                                    table_name])
        for constraint, kind in cursor.fetchall():
            if kind.lower() == "primary key":
                constraints[constraint]['primary_key'] = True
                constraints[constraint]['unique'] = True
            elif kind.lower() == "unique":
                constraints[constraint]['unique'] = True
        # Now add in the indexes
        cursor.execute("SHOW INDEX FROM %s" % self.connection.ops.quote_name(
            table_name))
        for table, non_unique, index, colseq, column in [x[:5] for x in
                                                         cursor.fetchall()]:
            if index not in constraints:
                constraints[index] = {
                    'columns': OrderedSet(),
                    'primary_key': False,
                    'unique': False,
                    'index': True,
                    'check': False,
                    'foreign_key': None,
                }
            constraints[index]['index'] = True
            constraints[index]['columns'].add(column)
        # Convert the sorted sets to lists
        for constraint in constraints.values():
            constraint['columns'] = list(constraint['columns'])
        return constraints

Youez - 2016 - github.com/yon3zu
LinuXploit