added DataStore.createTask()

DataStore.py

@@ -95,4 +95,34 @@ WHERE id = ?
         for row in c:
             t = Task(row[0], row[1], row[2])
         c.close()
+        self.conn.commit()
         return t
+
+    def createTask(self, name, longname, parentid):
+        c = self.conn.cursor()
+        if parentid is not None and parentid != '':
+            c.execute('''
+SELECT *
+FROM tasks
+WHERE id = ?
+''', (parentid,))
+            found = False
+            for row in c:
+                found = True
+            if not found:
+                return 0
+        c.execute('''
+SELECT MAX(id)
+FROM tasks
+''')
+        nextid = 1
+        for row in c:
+            if row[0] is not None:
+                nextid = row[0] + 1
+        c.execute('''
+INSERT INTO tasks
+VALUES (?, ?, ?, ?)
+''', (nextid, name, longname, parentid))
+        c.close()
+        self.conn.commit()
+        return nextid