SYSTEM VIEW · 系统视图

pg_prepared_statements

The pg_prepared_statements view displays all the prepared statements that are available in the current session. See PREPARE for more information about prepared statements. pg_prepared_statements contains one row for each prepared statement. Rows are added to the view when a new prepared statement is created and removed when a prepared statement is released (for example, via the DEALLOCATE command).

首次收录 PG 9.0最近收录 PG 19当前字段 8

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_prepared_statements

字段 / COLUMN	类型 / TYPE	说明 / DESCRIPTION
`name`	`text`	The identifier of the prepared statement
`statement`	`text`	The query string submitted by the client to create this prepared statement. For prepared statements created via SQL, this is the PREPARE statement submitted by the client. For prepared statements created via the frontend/backend protocol, this is the text of the prepared statement itself.
`prepare_time`	`timestamp with time zone`文档原写法：`timestamptz`	The time at which the prepared statement was created
`parameter_types`	`regtype[]`	The expected parameter types for the prepared statement in the form of an array of regtype. The OID corresponding to an element of this array can be obtained by casting the regtype value to oid.
`result_types`	`regtype[]`	The types of the columns returned by the prepared statement in the form of an array of regtype. The OID corresponding to an element of this array can be obtained by casting the regtype value to oid. If the prepared statement does not provide a result (e.g., a DML statement), then this field will be null.
`from_sql`	`boolean`文档原写法：`bool`	true if the prepared statement was created via the PREPARE SQL command; false if the statement was prepared via the frontend/backend protocol
`generic_plans`	`bigint`文档原写法：`int8`	Number of times generic plan was chosen
`custom_plans`	`bigint`文档原写法：`int8`	Number of times custom plan was chosen

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
`name`
`statement`
`prepare_time`
`parameter_types`
`from_sql`
`generic_plans`	–	–	–	–	–	–	–	–	–	–	–
`custom_plans`	–	–	–	–	–	–	–	–	–	–	–
`result_types`	–	–	–	–	–	–	–	–	–	–	–	–	–

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 16 ← 15

+ result_types

PostgreSQL 14 ← 13

+ generic_plans+ custom_plans

PostgreSQL 9.6 ← 9.5

1 处字段说明更新

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。