added DataStore.getTaskByNameParent()

DataStore.py

@@ -99,6 +99,27 @@ WHERE id = ?
         self.conn.commit()
         return t
 
+    def getTaskByNameParent(self, name, parentid):
+        t = None
+        c = self.conn.cursor()
+        if parentid is None:
+            c.execute('''
+SELECT id, name, longname, parentid
+FROM tasks
+WHERE name = ? AND parentid IS NULL
+''', (name,))
+        else:
+            c.execute('''
+SELECT id, name, longname, parentid
+FROM tasks
+WHERE name = ? AND parentid = ?
+''', (name, parentid))
+        for row in c:
+            t = Task(*row)
+        c.close()
+        self.conn.commit()
+        return t
+
     def createTask(self, name, longname, parentid):
         c = self.conn.cursor()
         if parentid is not None and parentid != '':