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42.28. pg_rewrite

The catalog pg_rewrite stores rewrite rules for tables and views.

Table 42-28. pg_rewrite Columns

Name Type References Description
rulename name   Rule name
ev_class oid pg_class.oid The table this rule is for
ev_attr int2   The column this rule is for (currently, always zero to indicate the whole table)
ev_type char   Event type that the rule is for: 1 = SELECT, 2 = UPDATE, 3 = INSERT, 4 = DELETE
is_instead bool   True if the rule is an INSTEAD rule
ev_qual text   Expression tree (in the form of a nodeToString() representation) for the rule's qualifying condition
ev_action text   Query tree (in the form of a nodeToString() representation) for the rule's action

Note: pg_class.relhasrules must be true if a table has any rules in this catalog.