【PostgreSQL】PG读取元数据获取表结构及字段类型信息(过程拆解及其他应用场景)

2023-02-14,,,,

〇、参考链接

一、代码

指定模式的表名和字段

select
c.relname 表名,
cast (
obj_description (relfilenode, 'pg_class') as varchar
) 名称,
d.description 字段备注,
a.attname 字段, concat_ws (
'',
t.typname,
SUBSTRING (
format_type (a.atttypid, a.atttypmod)
from
'\(.*\)'
)
) as 字段类型
from
pg_class c,
pg_attribute a,
pg_type t,
pg_description d
where
a.attnum > 0
and a.attrelid = c.oid
and a.atttypid = t.oid
and d.objoid = a.attrelid
and d.objsubid = a.attnum
and c.relname in (
select
tablename
from
pg_tables
where
schemaname = 'tp'
and position ('_2' in tablename) = 0
)
and c.relname = 'bd_bom_product_child'

二、查询不包含分区表的表名

select distinct
c.relname 表名
from
pg_class c,
pg_attribute a,
pg_type t,
pg_description d
where
a.attnum > 0
and a.attrelid = c.oid
and a.atttypid = t.oid
and d.objoid = a.attrelid
and d.objsubid = a.attnum
and c.relname in (
select
tablename
from
pg_tables
where
schemaname = 'tp'
and position ('_2' in tablename) = 0
)

三、查询带分区的表名

  select
tablename
from
pg_tables
where
schemaname = 'tp'
-- and position ('_2' in tablename) = 0

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