SYSTEM VIEW · 系统视图

pg_cursors

The pg_cursors view lists the cursors that are currently available. Cursors can be defined in several ways: The pg_cursors view displays cursors created by any of these means. Cursors only exist for the duration of the transaction that defines them, unless they have been declared WITH HOLD. Therefore non-holdable cursors are only present in the view until the end of their creating transaction.

首次收录 PG 9.0最近收录 PG 19当前字段 6

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_cursors

字段 / COLUMN	类型 / TYPE	说明 / DESCRIPTION
`name`	`text`	The name of the cursor
`statement`	`text`	The verbatim query string submitted to declare this cursor
`is_holdable`	`boolean`文档原写法：`bool`	true if the cursor is holdable (that is, it can be accessed after the transaction that declared the cursor has committed); false otherwise
`is_binary`	`boolean`文档原写法：`bool`	true if the cursor was declared BINARY; false otherwise
`is_scrollable`	`boolean`文档原写法：`bool`	true if the cursor is scrollable (that is, it allows rows to be retrieved in a nonsequential manner); false otherwise
`creation_time`	`timestamp with time zone`文档原写法：`timestamptz`	The time at which the cursor was declared

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。

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
`name`
`statement`
`is_holdable`
`is_binary`
`is_scrollable`
`creation_time`

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

收录版本之间没有字段结构或描述变化。

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。