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I've tried to pass BLOBs from a PL/SQL procedure using BLOB type parameters (I did set ParamType to ptOutput), and I always get the value NULL. Am I doing something wrong? I'm using ODAC 5.80.

Hello,

You are using a rather old version of ODAC, try to install the latest ODAC version (ODAC 8.0.2), and if the error persists, please send us a script to create the procedure and a small application demonstrating the problem.