I've some knowledge about SSRS, but how could integrate my application developed in PLEX with the SQL SSRS? I need some information about this topic.
Not sure what you want to integrate ... You could use a Browser Control within Plex and the make use of https://msdn.microsoft.com/en-us/library/ms153586.aspx
Just an idea.
see SQL Server with PLEX – Integration Strategy 3: SSRS Reports
Retrieving data ...