1 files changed, 50 insertions, 0 deletions
diff --git a/django/db/backends/sqlite3/introspection.py b/django/db/backends/sqlite3/introspection.py
new file mode 100644
index 0000000000..c5fa738249
--- /dev/null
+++ b/django/db/backends/sqlite3/introspection.py
@@ -0,0 +1,50 @@
+from django.db import transaction
+from django.db.backends.sqlite3.base import quote_name
+
+def get_table_list(cursor):
+    cursor.execute("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name")
+    return [row[0] for row in cursor.fetchall()]
+
+def get_table_description(cursor, table_name):
+    cursor.execute("PRAGMA table_info(%s)" % quote_name(table_name))
+    return [(row[1], row[2], None, None) for row in cursor.fetchall()]
+
+def get_relations(cursor, table_name):
+    raise NotImplementedError
+
+def get_indexes(cursor, table_name):
+    raise NotImplementedError
+
+# Maps SQL types to Django Field types. Some of the SQL types have multiple
+# entries here because SQLite allows for anything and doesn't normalize the
+# field type; it uses whatever was given.
+BASE_DATA_TYPES_REVERSE = {
+    'bool': 'BooleanField',
+    'boolean': 'BooleanField',
+    'smallint': 'SmallIntegerField',
+    'smallinteger': 'SmallIntegerField',
+    'int': 'IntegerField',
+    'integer': 'IntegerField',
+    'text': 'TextField',
+    'char': 'CharField',
+    'date': 'DateField',
+    'datetime': 'DateTimeField',
+    'time': 'TimeField',
+}
+
+# This light wrapper "fakes" a dictionary interface, because some SQLite data
+# types include variables in them -- e.g. "varchar(30)" -- and can't be matched
+# as a simple dictionary lookup.
+class FlexibleFieldLookupDict:
+    def __getitem__(self, key):
+        key = key.lower()
+        try:
+            return BASE_DATA_TYPES_REVERSE[key]
+        except KeyError:
+            import re
+            m = re.search(r'^\s*(?:var)?char\s*\(\s*(\d+)\s*\)\s*$', key)
+            if m:
+                return ('CharField', {'maxlength': int(m.group(1))})
+            raise KeyError
+
+DATA_TYPES_REVERSE = FlexibleFieldLookupDict()