How to change sql sentence which arrives database.

I am using ORACLE 10G,
I want to add criteria all sql sentence which come ORACLE 10G ,
how to do it ? , trigger or another system attributes
for example
if "select * from user" sql sentence come to db server, I want to change this sentence as "select * from user where mod =1"
thanks

All of my tables have "mode" column, when sql sentence come , I 'll read system_mode another database and then I read,delete,insert and update my tables according to this system_mode,
how to do this, I should block sqls , then read system_mode and finally add this criteria end of the sql sentence
thanks

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