PlSql = <<"BEGIN :p_res1 := 'This is a test1'; :p_res2 := 'This is a test2'; END;">>.
PlSqlBindVars = [{<<":p_res1">>,out,'SQLT_CHR'},{<<":p_res2">>,out,'SQLT_CHR'}].
PlSqlStmt = OciSession:prep_sql(PlSql).
ok = PlSqlStmt:bind_vars(PlSqlBindVars).
PlSqlStmt:exec_stmt([{<<" ">>,<<" ">>}], 1).
> {executed,1,
[{<<":p_res1">>,<<"This is a test1 ">>},
{<<":p_res2">>,<<"This is a test2 ">>}]}
ok = PlSqlStmt:close().