PostgreSQL 9.2 文档 · 45.37. pg

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45.37. `pg_rewrite`
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45.37. `pg_rewrite` #

目录pg_rewrite存储对于表和视图的重写规则。

表 45.37. pg_rewrite 列

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 -1 to indicate the whole table)
`ev_type`	`char`		Event type that the rule is for: 1 = `SELECT`, 2 = `UPDATE`, 3 = `INSERT`, 4 = `DELETE`
`ev_enabled`	`char`		Controls in which session_replication_role modes the rule fires. `O` = rule fires in “origin” and “local” modes, `D` = rule is disabled, `R` = rule fires in “replica” mode, `A` = rule fires always.
`is_instead`	`bool`		True if the rule is an `INSTEAD` rule
`ev_qual`	`pg_node_tree`		Expression tree (in the form of a `nodeToString()` representation) for the rule's qualifying condition
`ev_action`	`pg_node_tree`		Query tree (in the form of a `nodeToString()` representation) for the rule's action

如果一个表在这个目录中有任何规则，pg_class.relhasrules必须为真。

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