MogDB/openGauss学习笔记-获取对象DDL

MogDB/openGauss 学习笔记-获取对象 DDL
本文出处：https://www.modb.pro/db/399230

内置函数
omm2=# \df *def List of functions Schema | Name | Result data type | Argument data types | Type | fencedmode | propackage | prokind ------------+----------------------+------------------+----------------------------------------------------------+--------+------------+------------+--------- pg_catalog | pg_get_constraintdef | text | oid | normal | f | f | f pg_catalog | pg_get_constraintdef | text | oid, boolean | normal | f | f | f pg_catalog | pg_get_functiondef | record | funcid oid, OUT headerlines integer, OUT definition text | normal | f | f | f pg_catalog | pg_get_indexdef | text | oid | normal | f | f | f pg_catalog | pg_get_indexdef | text | oid, boolean | normal | f | f | f pg_catalog | pg_get_indexdef | text | oid, integer, boolean | normal | f | f | f pg_catalog | pg_get_ruledef | text | oid | normal | f | f | f pg_catalog | pg_get_ruledef | text | oid, boolean | normal | f | f | f pg_catalog | pg_get_tabledef | text | regclass | normal | f | f | f pg_catalog | pg_get_triggerdef | text | oid | normal | f | f | f pg_catalog | pg_get_triggerdef | text | oid, boolean | normal | f | f | f pg_catalog | pg_get_viewdef | text | oid | normal | f | f | f pg_catalog | pg_get_viewdef | text | oid, boolean | normal | f | f | f pg_catalog | pg_get_viewdef | text | oid, integer | normal | f | f | f pg_catalog | pg_get_viewdef | text | text | normal | f | f | f pg_catalog | pg_get_viewdef | text | text, boolean | normal | f | f | f (16 rows)
示例
获取表的 DDL
omm2=# select pg_get_tabledef('t');
pg_get_tabledef

SET search_path = public; +
CREATE TABLE t ( +
id numeric, +
c character varying(100) +
) +
WITH (orientation=row, fillfactor=50, compression=no);
(1 row)

omm2=# \x
Expanded display is on.
omm2=# select pg_get_tabledef('t');
-[ RECORD 1 ]---+-------------------------------------------------------
pg_get_tabledef | SET search_path = public;
| CREATE TABLE t (
| id numeric,
| c character varying(100)
| )
| WITH (orientation=row, fillfactor=50, compression=no);
获取索引 DDL
omm2=# select pg_get_indexdef('idx_t_id'::regclass);
pg_get_indexdef

CREATE INDEX idx_t_id ON t USING btree (id) TABLESPACE pg_default
(1 row)

还可以直接查询视图
omm2=# \x
Expanded display is on.
omm2=# select * from pg_indexes where indexname='idx_t_id';
-[ RECORD 1 ]-----------------------------------------------------------------
schemaname | public
tablename | t
indexname | idx_t_id
tablespace |
indexdef | CREATE INDEX idx_t_id ON t USING btree (id) TABLESPACE pg_default
通过 gs_dump 生成 ddl
这样还可以生成表及表上的索引定义等 $ gs_dump -t t –section pre-data omm2

$ gs_dump -t t --section pre-data omm2

SET statement_timeout = 0;
SET xmloption = content;
SET client_encoding = 'UTF8';
SET standard_conforming_strings = on;
SET check_function_bodies = false;
SET client_min_messages = warning;

SET search_path = public;

SET default_tablespace = '';

SET default_with_oids = false;

--
-- Name: t; Type: TABLE; Schema: public; Owner: omm2; Tablespace:

CREATE TABLE t (
id numeric,
c character varying(100)
)
WITH (orientation=row, fillfactor=50, compression=no);

ALTER TABLE public.t OWNER TO omm2;
$ gs_dump -t t –section post-data omm2

$ gs_dump -t t --section post-data omm2

SET statement_timeout = 0;
SET xmloption = content;
SET client_encoding = 'UTF8';
SET standard_conforming_strings = on;
SET check_function_bodies = false;
SET client_min_messages = warning;

SET search_path = public;

SET default_tablespace = '';

--
-- Name: idx_t_id; Type: INDEX; Schema: public; Owner: omm2; Tablespace:

CREATE INDEX idx_t_id ON t USING btree (id) TABLESPACE pg_default;