changed: DirContainer - uses std::list instead of std::vector as the main container

we do not have to rebuild indexes after deleting some items
added:   DirContainer::DelById(long id)
changed: Dirs::CheckRootDir() addes the root dir if there is no one
added:   Dirs::DeleteDir(long id) - deletes specified directory (and its contents)
         (from the cache and the database)
added:   Db::DelDirById(long id) - deletes a dir from the database 
         and its first children
added:   standard function rm can delete directories


git-svn-id: svn://ttmath.org/publicrep/cmslu/trunk@487 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/db.cpp

@@ -986,6 +986,46 @@ return result;
 
 
 
+Error Db::DelDirById(long id)
+{
+	Error result = Error::ok;
+	PGresult * r = 0;
+	const char * crows;
+	
+	try
+	{
+		AssertConnection();
+		std::ostringstream query, query2;
+
+		query << "delete from core.content where content.id in (select content_id from core.item where parent_id='" << id << "');";
+		r = AssertQuery( query.str() );
+		AssertResultStatus(r, PGRES_COMMAND_OK);
+
+		crows = PQcmdTuples(r);
+		if( crows )
+			log << log2 << "Db: deleted " << atol(crows) << " rows from core.content" << logend;	
+
+		query2 << "delete from core.item where id='" << id << "' or parent_id='" << id << "';";
+		r = AssertQuery( query2.str() );
+		AssertResultStatus(r, PGRES_COMMAND_OK);
+		
+		crows = PQcmdTuples(r);
+		if( crows )
+			log << log1 << "Db: deleted dir: " << id << " (deleted: " << atol(crows) << " rows)" << logend;	
+	}
+	catch(const Error & e)
+	{
+		result = e;
+	}
+	
+	ClearResult(r);
+	
+	
+return result;
+}
+
+
+
 
 bool Db::DelItemDelItem(const Item & item)
 {