SYSTEM CATALOG · 系统目录

pg_language

The catalog pg_language registers languages in which you can write functions or stored procedures. See CREATE LANGUAGE and Chapter 40 for more information about language handlers.

首次收录 PG 9.0最近收录 PG 19当前字段 9

9.0 9.1 9.2 9.3 9.4 9.5 9.6 10 11 12 13 14 15 16 17 18 19^β3

已与 PostgreSQL 18.6 实例逐字段核对 · 原始实测记录 ↗

字段结构 PostgreSQL 18

pg_language

字段 / COLUMN	类型 / TYPE	说明 / DESCRIPTION
`oid`	`oid`NOT NULL	Row identifier
`lanname`	`name`NOT NULL	Name of the language
`lanowner`	`oid`NOT NULL	Owner of the language引用：`pg_authid.oid`
`lanispl`	`boolean`NOT NULL文档原写法：`bool`	This is false for internal languages (such as SQL) and true for user-defined languages. Currently, pg_dump still uses this to determine which languages need to be dumped, but this might be replaced by a different mechanism in the future.
`lanpltrusted`	`boolean`NOT NULL文档原写法：`bool`	True if this is a trusted language, which means that it is believed not to grant access to anything outside the normal SQL execution environment. Only superusers can create functions in untrusted languages.
`lanplcallfoid`	`oid`NOT NULL	For noninternal languages this references the language handler, which is a special function that is responsible for executing all functions that are written in the particular language. Zero for internal languages.引用：`pg_proc.oid`
`laninline`	`oid`NOT NULL	This references a function that is responsible for executing “inline” anonymous code blocks (DO blocks). Zero if inline blocks are not supported.引用：`pg_proc.oid`
`lanvalidator`	`oid`NOT NULL	This references a language validator function that is responsible for checking the syntax and validity of new functions when they are created. Zero if no validator is provided.引用：`pg_proc.oid`
`lanacl`	`aclitem[]`	Access privileges; see Section 5.8 for details

标记“隐式列”的字段不包含在 SELECT * 中；部分早期统计视图由同版本源码补全，额外来源会显示在字段说明中。

通用系统列 6

PostgreSQL 提供的系统属性，通常不在 SELECT * 中展开。单独保留，不与普通字段混算。

字段	类型	attnum
`tableoid`	`oid`	-6
`cmax`	`cid`	-5
`xmax`	`xid`	-4
`cmin`	`cid`	-3
`xmin`	`xid`	-2
`ctid`	`tid`	-1

字段演化矩阵

悬停查看字段类型

存在新增 / 类型或属性变化移除

字段 / COLUMN	9.0	9.1	9.2	9.3	9.4	9.5	9.6	10	11	12	13	14	15	16	17	18	19
`oid`
`lanname`
`lanowner`
`lanispl`
`lanpltrusted`
`lanplcallfoid`
`laninline`
`lanvalidator`
`lanacl`

9.0 是收录基线；基线中已存在的字段不标记为新增。矩阵按字段名称对齐，重命名显示为旧字段移除与新字段新增。

演化时间线

相邻大版本的变化

PostgreSQL 19 ← 18

1 处字段说明更新

PostgreSQL 17 ← 16

1 处字段说明更新目录说明更新

PostgreSQL 14 ← 13

1 处字段说明更新目录说明更新

PostgreSQL 12 ← 11

~ oid: 隐式列 → 常规列2 处字段说明更新目录说明更新

PostgreSQL 11 ← 10

目录说明更新

PostgreSQL 10 ← 9.6

1 处字段说明更新目录说明更新

PostgreSQL 9.6 ← 9.5

目录说明更新

PostgreSQL 9.3 ← 9.2

1 处字段说明更新目录说明更新

比较任意两个版本

起始版本 / FROM目标版本 / TO包含描述更新

选择两个版本，查看字段的新增、移除与类型变化。交互比较需要 JavaScript；演化时间线可直接阅读。