批量重命名列postgresql

Question

是否可以在postgresql中对特定类型的所有列进行批量重命名。我有一系列的表，它们都有几何类型的列(每个表只有1个)，名称如"the_geom“、"geom”、"SP_GEOMETRY“等，由于使用不同的导入工具，它们都有不同的名称。

我希望能够将它们全部重命名为"the_geom“或"geom”。

Answer 1

运行此查询以生成所需的所有DDL语句：

SELECT 'ALTER TABLE ' || quote_ident(n.nspname) || '.' || quote_ident(c.relname)
    || ' RENAME column ' || quote_ident(a.attname) || ' TO geom;'
FROM   pg_catalog.pg_attribute a
JOIN   pg_catalog.pg_class c ON c.oid = a.attrelid
JOIN   pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE  a.attnum >= 1
AND    a.atttypid = 'geometry'::regtype::oid
AND    a.attname <> 'geom'
AND    NOT a.attisdropped
AND    n.nspname !~~ 'pg_%'  -- exclude catalog & temp tables, to be sure
-- AND    n.nspname = 'myschema'  -- target specific schema only?

Answer 2

查询系统目录并生成命令通常是最简单的方法。如下所示：

select
   'alter table ' || quote_ident(nspname) || '.' || quote_ident(relname)
      || ' rename column ' || quote_ident(attname)
      || ' to ' || quote_ident('xxx')
from pg_attribute
join pg_class on pg_class.oid = pg_attribute.attrelid
join pg_namespace on pg_namespace.oid = pg_class.relnamespace
where atttypid = 'geometry'::regtype and (attname ~* 'geom')
      and not attisdropped and attnum > 0 and pg_class.oid >= 16384