Settings functionality to add/update last processed index in specifie…

…d Paradox file for specified task. Task is accessed by GUID since user can remove task and add task with same name but different files.

settings.py

@@ -17,7 +17,7 @@
     dst TEXT);
   CREATE TABLE IF NOT EXISTS index_last (
     guid TEXT,
-    name TEXT,
+    file TEXT,
     index_last INTEGER);
 """
 SQL_TASK_ADD = """INSERT INTO task (guid, name, src, dst)
@@ -26,6 +26,10 @@
 SQL_TASK_DEL_BY_NAME = """DELETE FROM task WHERE name = :name"""
 SQL_TASK_GUID_BY_NAME = """SELECT guid FROM task WHERE name = :name"""
 SQL_INDEX_LAST_DEL = """DELETE FROM index_last WHERE guid = :guid"""
+SQL_INDEX_LAST_UPDATE = """UPDATE index_last SET index_last = :index_last
+  WHERE guid = :guid AND file = :file"""
+SQL_INDEX_LAST_ADD = """INSERT INTO index_last (guid, file, index_last)
+  VALUES (:guid, :file, :index_last)"""
 
 class Settings( object ) :
 
@@ -66,6 +70,19 @@ def taskAdd( self, i_sName, i_sSrc, i_sDst ) :
       finally :
         self.notifyIfNeeded()
 
+  @classmethod
+  def indexLastSet( i_sGuid, i_sFile, i_nIndex ) :
+    with sqlite3.connect( FILE_CFG ) as oConn :
+      mArgs = {
+        'guid' : i_sGuid,
+        'file' : i_sFile,
+        'index_last' : i_nIndex }
+      oRet = oConn.execute( SQL_INDEX_LAST_UPDATE, mArgs )
+      if oRet.rowcount > 0 :
+        return
+      ##  No record for guid and name pair: add one.
+      oConn.execute( SQL_INDEX_LAST_ADD, mArgs )
+
   @classmethod
   def taskDelByName( self, i_sName ) :
     with sqlite3.connect( FILE_CFG ) as oConn :