I want to execute a sql file for that I need to disable constraints.

 In postgres version 8.3,  I was executing the script by doing the
following: 
1.      Disabling triggers by updating “reltriggers” field of pg_class to 0 .
2.      Executing sql file
3.      Then updating “reltriggers” field of pg_class by “select count(*) from
pg_trigger where pg_trigger.tgrelid=pg_class.oid”

In postgres version 8.4, “pg_class” table does not have “reltriggers” field. 

How can I disable and enable constraints in Postgres Version 8.4?

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