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@ -173,6 +173,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
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supports_binary_field = six.PY2
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supports_regex_backreferencing = False
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supports_date_lookup_using_string = False
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can_introspect_autofield = True
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can_introspect_binary_field = False
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can_introspect_small_integer_field = True
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supports_timezones = False
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@ -1,9 +1,11 @@
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from collections import namedtuple
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import re
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from .base import FIELD_TYPE
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from django.utils.datastructures import OrderedSet
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from django.db.backends import BaseDatabaseIntrospection, FieldInfo, TableInfo
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from django.utils.encoding import force_text
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FieldInfo = namedtuple('FieldInfo', FieldInfo._fields + ('extra',))
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foreign_key_re = re.compile(r"\sCONSTRAINT `[^`]*` FOREIGN KEY \(`([^`]*)`\) REFERENCES `([^`]*)` \(`([^`]*)`\)")
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@ -32,6 +34,12 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
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FIELD_TYPE.VAR_STRING: 'CharField',
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}
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def get_field_type(self, data_type, description):
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field_type = super(DatabaseIntrospection, self).get_field_type(data_type, description)
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if field_type == 'IntegerField' and 'auto_increment' in description.extra:
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return 'AutoField'
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return field_type
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def get_table_list(self, cursor):
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"""
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Returns a list of table and view names in the current database.
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@ -44,28 +52,33 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
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"""
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Returns a description of the table, with the DB-API cursor.description interface."
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"""
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# varchar length returned by cursor.description is an internal length,
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# not visible length (#5725), use information_schema database to fix this
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# information_schema database gives more accurate results for some figures:
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# - varchar length returned by cursor.description is an internal length,
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# not visible length (#5725)
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# - precision and scale (for decimal fields) (#5014)
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# - auto_increment is not available in cursor.description
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InfoLine = namedtuple('InfoLine', 'col_name data_type max_len num_prec num_scale extra')
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cursor.execute("""
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SELECT column_name, character_maximum_length FROM information_schema.columns
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WHERE table_name = %s AND table_schema = DATABASE()
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AND character_maximum_length IS NOT NULL""", [table_name])
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length_map = dict(cursor.fetchall())
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# Also getting precision and scale from information_schema (see #5014)
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cursor.execute("""
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SELECT column_name, numeric_precision, numeric_scale FROM information_schema.columns
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WHERE table_name = %s AND table_schema = DATABASE()
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AND data_type='decimal'""", [table_name])
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numeric_map = dict((line[0], tuple(int(n) for n in line[1:])) for line in cursor.fetchall())
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SELECT column_name, data_type, character_maximum_length, numeric_precision, numeric_scale, extra
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FROM information_schema.columns
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WHERE table_name = %s AND table_schema = DATABASE()""", [table_name])
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field_info = dict((line[0], InfoLine(*line)) for line in cursor.fetchall())
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cursor.execute("SELECT * FROM %s LIMIT 1" % self.connection.ops.quote_name(table_name))
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return [FieldInfo(*((force_text(line[0]),)
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to_int = lambda i: int(i) if i is not None else i
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fields = []
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for line in cursor.description:
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col_name = force_text(line[0])
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fields.append(
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FieldInfo(*((col_name,)
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+ line[1:3]
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+ (length_map.get(line[0], line[3]),)
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+ numeric_map.get(line[0], line[4:6])
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+ (line[6],)))
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for line in cursor.description]
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+ (to_int(field_info[col_name].max_len) or line[3],
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to_int(field_info[col_name].num_prec) or line[4],
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to_int(field_info[col_name].num_scale) or line[5])
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+ (line[6],)
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+ (field_info[col_name].extra,)))
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)
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return fields
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def _name_to_index(self, cursor, table_name):
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"""
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