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;