/usr/lib/python2.7/dist-packages/mysql/connector/django/introspection.py is in python-mysql.connector 1.2.3-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 | # MySQL Connector/Python - MySQL driver written in Python.
import re
import django
from django.db.backends import BaseDatabaseIntrospection
if django.VERSION >= (1, 6):
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 `([^`]*)` \(`([^`]*)`\)")
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',
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_table_list(self, cursor):
"Returns a list of table names in the current database."
cursor.execute("SHOW TABLES")
return [row[0] for row in cursor.fetchall()]
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.
"""
my_field_dict = self._name_to_index(cursor, table_name)
constraints = self.get_key_columns(cursor, table_name)
relations = {}
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_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
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