Fixed #24365 -- Made inspectdb translate MySQL unsigned integer columns to positive integer fields.

django/db/backends/mysql/features.py

@@ -17,6 +17,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     can_introspect_autofield = True
     can_introspect_binary_field = False
     can_introspect_small_integer_field = True
+    can_introspect_positive_integer_field = True
     supports_index_column_ordering = False
     supports_timezones = False
     requires_explicit_null_ordering_when_grouping = True

django/db/backends/mysql/introspection.py

@@ -10,8 +10,8 @@ from django.db.models.indexes import Index
 from django.utils.datastructures import OrderedSet
 from django.utils.deprecation import RemovedInDjango21Warning
 
-FieldInfo = namedtuple('FieldInfo', FieldInfo._fields + ('extra',))
-InfoLine = namedtuple('InfoLine', 'col_name data_type max_len num_prec num_scale extra column_default')
+FieldInfo = namedtuple('FieldInfo', FieldInfo._fields + ('extra', 'is_unsigned'))
+InfoLine = namedtuple('InfoLine', 'col_name data_type max_len num_prec num_scale extra column_default is_unsigned')
 
 
 class DatabaseIntrospection(BaseDatabaseIntrospection):
@@ -45,7 +45,11 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
                 return 'AutoField'
             elif field_type == 'BigIntegerField':
                 return 'BigAutoField'
-
+        if description.is_unsigned:
+            if field_type == 'IntegerField':
+                return 'PositiveIntegerField'
+            elif field_type == 'SmallIntegerField':
+                return 'PositiveSmallIntegerField'
         return field_type
 
     def get_table_list(self, cursor):
@@ -65,8 +69,13 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
         # - 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
+            SELECT
+                column_name, data_type, character_maximum_length,
+                numeric_precision, numeric_scale, extra, column_default,
+                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()""", [table_name])
         field_info = {line[0]: InfoLine(*line) for line in cursor.fetchall()}
@@ -90,6 +99,7 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
                         line[6],
                         field_info[col_name].column_default,
                         field_info[col_name].extra,
+                        field_info[col_name].is_unsigned,
                     )
                 ))
             )

docs/releases/2.0.txt

@@ -159,7 +159,8 @@ Internationalization
 Management Commands
 ~~~~~~~~~~~~~~~~~~~
 
-* ...
+* :djadmin:`inspectdb` now translates MySQL's unsigned integer columns to
+  ``PositiveIntegerField`` or ``PositiveSmallIntegerField``.
 
 Migrations
 ~~~~~~~~~~