Ajoutez des fichiers projet.
This commit is contained in:
Ambulance Clerc
309
venv/Lib/site-packages/django/db/backends/mysql/introspection.py
Normal file
309
venv/Lib/site-packages/django/db/backends/mysql/introspection.py
Normal file
@@ -0,0 +1,309 @@
|
||||
from collections import namedtuple
|
||||
|
||||
import sqlparse
|
||||
from MySQLdb.constants import FIELD_TYPE
|
||||
|
||||
from django.db.backends.base.introspection import (
|
||||
BaseDatabaseIntrospection, FieldInfo as BaseFieldInfo, TableInfo,
|
||||
)
|
||||
from django.db.models import Index
|
||||
from django.utils.datastructures import OrderedSet
|
||||
|
||||
FieldInfo = namedtuple('FieldInfo', BaseFieldInfo._fields + ('extra', 'is_unsigned', 'has_json_constraint'))
|
||||
InfoLine = namedtuple(
|
||||
'InfoLine',
|
||||
'col_name data_type max_len num_prec num_scale extra column_default '
|
||||
'collation is_unsigned'
|
||||
)
|
||||
|
||||
|
||||
class DatabaseIntrospection(BaseDatabaseIntrospection):
|
||||
data_types_reverse = {
|
||||
FIELD_TYPE.BLOB: 'TextField',
|
||||
FIELD_TYPE.CHAR: 'CharField',
|
||||
FIELD_TYPE.DECIMAL: 'DecimalField',
|
||||
FIELD_TYPE.NEWDECIMAL: 'DecimalField',
|
||||
FIELD_TYPE.DATE: 'DateField',
|
||||
FIELD_TYPE.DATETIME: 'DateTimeField',
|
||||
FIELD_TYPE.DOUBLE: 'FloatField',
|
||||
FIELD_TYPE.FLOAT: 'FloatField',
|
||||
FIELD_TYPE.INT24: 'IntegerField',
|
||||
FIELD_TYPE.JSON: 'JSONField',
|
||||
FIELD_TYPE.LONG: 'IntegerField',
|
||||
FIELD_TYPE.LONGLONG: 'BigIntegerField',
|
||||
FIELD_TYPE.SHORT: 'SmallIntegerField',
|
||||
FIELD_TYPE.STRING: 'CharField',
|
||||
FIELD_TYPE.TIME: 'TimeField',
|
||||
FIELD_TYPE.TIMESTAMP: 'DateTimeField',
|
||||
FIELD_TYPE.TINY: 'IntegerField',
|
||||
FIELD_TYPE.TINY_BLOB: 'TextField',
|
||||
FIELD_TYPE.MEDIUM_BLOB: 'TextField',
|
||||
FIELD_TYPE.LONG_BLOB: 'TextField',
|
||||
FIELD_TYPE.VAR_STRING: 'CharField',
|
||||
}
|
||||
|
||||
def get_field_type(self, data_type, description):
|
||||
field_type = super().get_field_type(data_type, description)
|
||||
if 'auto_increment' in description.extra:
|
||||
if field_type == 'IntegerField':
|
||||
return 'AutoField'
|
||||
elif field_type == 'BigIntegerField':
|
||||
return 'BigAutoField'
|
||||
elif field_type == 'SmallIntegerField':
|
||||
return 'SmallAutoField'
|
||||
if description.is_unsigned:
|
||||
if field_type == 'BigIntegerField':
|
||||
return 'PositiveBigIntegerField'
|
||||
elif field_type == 'IntegerField':
|
||||
return 'PositiveIntegerField'
|
||||
elif field_type == 'SmallIntegerField':
|
||||
return 'PositiveSmallIntegerField'
|
||||
# JSON data type is an alias for LONGTEXT in MariaDB, use check
|
||||
# constraints clauses to introspect JSONField.
|
||||
if description.has_json_constraint:
|
||||
return 'JSONField'
|
||||
return field_type
|
||||
|
||||
def get_table_list(self, cursor):
|
||||
"""Return a list of table and view names in the current database."""
|
||||
cursor.execute("SHOW FULL TABLES")
|
||||
return [TableInfo(row[0], {'BASE TABLE': 't', 'VIEW': 'v'}.get(row[1]))
|
||||
for row in cursor.fetchall()]
|
||||
|
||||
def get_table_description(self, cursor, table_name):
|
||||
"""
|
||||
Return a description of the table with the DB-API cursor.description
|
||||
interface."
|
||||
"""
|
||||
json_constraints = {}
|
||||
if self.connection.mysql_is_mariadb and self.connection.features.can_introspect_json_field:
|
||||
# JSON data type is an alias for LONGTEXT in MariaDB, select
|
||||
# JSON_VALID() constraints to introspect JSONField.
|
||||
cursor.execute("""
|
||||
SELECT c.constraint_name AS column_name
|
||||
FROM information_schema.check_constraints AS c
|
||||
WHERE
|
||||
c.table_name = %s AND
|
||||
LOWER(c.check_clause) = 'json_valid(`' + LOWER(c.constraint_name) + '`)' AND
|
||||
c.constraint_schema = DATABASE()
|
||||
""", [table_name])
|
||||
json_constraints = {row[0] for row in cursor.fetchall()}
|
||||
# A default collation for the given table.
|
||||
cursor.execute("""
|
||||
SELECT table_collation
|
||||
FROM information_schema.tables
|
||||
WHERE table_schema = DATABASE()
|
||||
AND table_name = %s
|
||||
""", [table_name])
|
||||
row = cursor.fetchone()
|
||||
default_column_collation = row[0] if row else ''
|
||||
# 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
|
||||
cursor.execute("""
|
||||
SELECT
|
||||
column_name, data_type, character_maximum_length,
|
||||
numeric_precision, numeric_scale, extra, column_default,
|
||||
CASE
|
||||
WHEN collation_name = %s THEN NULL
|
||||
ELSE collation_name
|
||||
END AS collation_name,
|
||||
CASE
|
||||
WHEN column_type LIKE '%% unsigned' THEN 1
|
||||
ELSE 0
|
||||
END AS is_unsigned
|
||||
FROM information_schema.columns
|
||||
WHERE table_name = %s AND table_schema = DATABASE()
|
||||
""", [default_column_collation, table_name])
|
||||
field_info = {line[0]: InfoLine(*line) for line in cursor.fetchall()}
|
||||
|
||||
cursor.execute("SELECT * FROM %s LIMIT 1" % self.connection.ops.quote_name(table_name))
|
||||
|
||||
def to_int(i):
|
||||
return int(i) if i is not None else i
|
||||
|
||||
fields = []
|
||||
for line in cursor.description:
|
||||
info = field_info[line[0]]
|
||||
fields.append(FieldInfo(
|
||||
*line[:3],
|
||||
to_int(info.max_len) or line[3],
|
||||
to_int(info.num_prec) or line[4],
|
||||
to_int(info.num_scale) or line[5],
|
||||
line[6],
|
||||
info.column_default,
|
||||
info.collation,
|
||||
info.extra,
|
||||
info.is_unsigned,
|
||||
line[0] in json_constraints,
|
||||
))
|
||||
return fields
|
||||
|
||||
def get_sequences(self, cursor, table_name, table_fields=()):
|
||||
for field_info in self.get_table_description(cursor, table_name):
|
||||
if 'auto_increment' in field_info.extra:
|
||||
# MySQL allows only one auto-increment column per table.
|
||||
return [{'table': table_name, 'column': field_info.name}]
|
||||
return []
|
||||
|
||||
def get_relations(self, cursor, table_name):
|
||||
"""
|
||||
Return a dictionary of {field_name: (field_name_other_table, other_table)}
|
||||
representing all relationships to the given table.
|
||||
"""
|
||||
constraints = self.get_key_columns(cursor, table_name)
|
||||
relations = {}
|
||||
for my_fieldname, other_table, other_field in constraints:
|
||||
relations[my_fieldname] = (other_field, other_table)
|
||||
return relations
|
||||
|
||||
def get_key_columns(self, cursor, table_name):
|
||||
"""
|
||||
Return a list of (column_name, referenced_table_name, referenced_column_name)
|
||||
for all key columns in the 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_storage_engine(self, cursor, table_name):
|
||||
"""
|
||||
Retrieve the storage engine for a given table. Return the default
|
||||
storage engine if the table doesn't exist.
|
||||
"""
|
||||
cursor.execute("""
|
||||
SELECT engine
|
||||
FROM information_schema.tables
|
||||
WHERE
|
||||
table_name = %s AND
|
||||
table_schema = DATABASE()
|
||||
""", [table_name])
|
||||
result = cursor.fetchone()
|
||||
if not result:
|
||||
return self.connection.features._mysql_storage_engine
|
||||
return result[0]
|
||||
|
||||
def _parse_constraint_columns(self, check_clause, columns):
|
||||
check_columns = OrderedSet()
|
||||
statement = sqlparse.parse(check_clause)[0]
|
||||
tokens = (token for token in statement.flatten() if not token.is_whitespace)
|
||||
for token in tokens:
|
||||
if (
|
||||
token.ttype == sqlparse.tokens.Name and
|
||||
self.connection.ops.quote_name(token.value) == token.value and
|
||||
token.value[1:-1] in columns
|
||||
):
|
||||
check_columns.add(token.value[1:-1])
|
||||
return check_columns
|
||||
|
||||
def get_constraints(self, cursor, table_name):
|
||||
"""
|
||||
Retrieve any constraints or keys (unique, pk, fk, check, index) across
|
||||
one or more columns.
|
||||
"""
|
||||
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`,
|
||||
c.`constraint_type`
|
||||
FROM
|
||||
information_schema.key_column_usage AS kc,
|
||||
information_schema.table_constraints AS c
|
||||
WHERE
|
||||
kc.table_schema = DATABASE() AND
|
||||
c.table_schema = kc.table_schema AND
|
||||
c.constraint_name = kc.constraint_name AND
|
||||
c.constraint_type != 'CHECK' AND
|
||||
kc.table_name = %s
|
||||
ORDER BY kc.`ordinal_position`
|
||||
"""
|
||||
cursor.execute(name_query, [table_name])
|
||||
for constraint, column, ref_table, ref_column, kind in cursor.fetchall():
|
||||
if constraint not in constraints:
|
||||
constraints[constraint] = {
|
||||
'columns': OrderedSet(),
|
||||
'primary_key': kind == 'PRIMARY KEY',
|
||||
'unique': kind in {'PRIMARY KEY', 'UNIQUE'},
|
||||
'index': False,
|
||||
'check': False,
|
||||
'foreign_key': (ref_table, ref_column) if ref_column else None,
|
||||
}
|
||||
if self.connection.features.supports_index_column_ordering:
|
||||
constraints[constraint]['orders'] = []
|
||||
constraints[constraint]['columns'].add(column)
|
||||
# Add check constraints.
|
||||
if self.connection.features.can_introspect_check_constraints:
|
||||
unnamed_constraints_index = 0
|
||||
columns = {info.name for info in self.get_table_description(cursor, table_name)}
|
||||
if self.connection.mysql_is_mariadb:
|
||||
type_query = """
|
||||
SELECT c.constraint_name, c.check_clause
|
||||
FROM information_schema.check_constraints AS c
|
||||
WHERE
|
||||
c.constraint_schema = DATABASE() AND
|
||||
c.table_name = %s
|
||||
"""
|
||||
else:
|
||||
type_query = """
|
||||
SELECT cc.constraint_name, cc.check_clause
|
||||
FROM
|
||||
information_schema.check_constraints AS cc,
|
||||
information_schema.table_constraints AS tc
|
||||
WHERE
|
||||
cc.constraint_schema = DATABASE() AND
|
||||
tc.table_schema = cc.constraint_schema AND
|
||||
cc.constraint_name = tc.constraint_name AND
|
||||
tc.constraint_type = 'CHECK' AND
|
||||
tc.table_name = %s
|
||||
"""
|
||||
cursor.execute(type_query, [table_name])
|
||||
for constraint, check_clause in cursor.fetchall():
|
||||
constraint_columns = self._parse_constraint_columns(check_clause, columns)
|
||||
# Ensure uniqueness of unnamed constraints. Unnamed unique
|
||||
# and check columns constraints have the same name as
|
||||
# a column.
|
||||
if set(constraint_columns) == {constraint}:
|
||||
unnamed_constraints_index += 1
|
||||
constraint = '__unnamed_constraint_%s__' % unnamed_constraints_index
|
||||
constraints[constraint] = {
|
||||
'columns': constraint_columns,
|
||||
'primary_key': False,
|
||||
'unique': False,
|
||||
'index': False,
|
||||
'check': True,
|
||||
'foreign_key': None,
|
||||
}
|
||||
# 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, order, type_ in [
|
||||
x[:6] + (x[10],) for x in cursor.fetchall()
|
||||
]:
|
||||
if index not in constraints:
|
||||
constraints[index] = {
|
||||
'columns': OrderedSet(),
|
||||
'primary_key': False,
|
||||
'unique': not non_unique,
|
||||
'check': False,
|
||||
'foreign_key': None,
|
||||
}
|
||||
if self.connection.features.supports_index_column_ordering:
|
||||
constraints[index]['orders'] = []
|
||||
constraints[index]['index'] = True
|
||||
constraints[index]['type'] = Index.suffix if type_ == 'BTREE' else type_.lower()
|
||||
constraints[index]['columns'].add(column)
|
||||
if self.connection.features.supports_index_column_ordering:
|
||||
constraints[index]['orders'].append('DESC' if order == 'D' else 'ASC')
|
||||
# Convert the sorted sets to lists
|
||||
for constraint in constraints.values():
|
||||
constraint['columns'] = list(constraint['columns'])
|
||||
return constraints
|
||||
Reference in New Issue
Block a user