Fixed #32672 -- Fixed introspection of primary key constraints on SQLite.

Thanks Simon Charette for the implementation idea.

django/db/backends/sqlite3/introspection.py

@@ -201,25 +201,12 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
 
     def get_primary_key_column(self, cursor, table_name):
         """Return the column name of the primary key for the given table."""
-        # Don't use PRAGMA because that causes issues with some transactions
         cursor.execute(
-            "SELECT sql, type FROM sqlite_master "
-            "WHERE tbl_name = %s AND type IN ('table', 'view')",
-            [table_name]
+            'PRAGMA table_info(%s)' % self.connection.ops.quote_name(table_name)
         )
-        row = cursor.fetchone()
-        if row is None:
-            raise ValueError("Table %s does not exist" % table_name)
-        create_sql, table_type = row
-        if table_type == 'view':
-            # Views don't have a primary key.
-            return None
-        fields_sql = create_sql[create_sql.index('(') + 1:create_sql.rindex(')')]
-        for field_desc in fields_sql.split(','):
-            field_desc = field_desc.strip()
-            m = re.match(r'(?:(?:["`\[])(.*)(?:["`\]])|(\w+)).*PRIMARY KEY.*', field_desc)
-            if m:
-                return m[1] if m[1] else m[2]
+        for _, name, *_, pk in cursor.fetchall():
+            if pk:
+                return name
         return None
 
     def _get_foreign_key_constraints(self, cursor, table_name):