study PostgreSQL【3-get数据库中all表以及表的字段信息】

get一表的字段相关信息：

SELECT  col_description(a.attrelid,a.attnum) as comment,pg_type.typname as typename,a.attname as name, a.attnotnull as notnull
FROM pg_class as c,pg_attribute as a inner join pg_type on pg_type.oid = a.atttypid
where c.relname = '表名' and a.attrelid = c.oid and a.attnum>0；

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SELECT * 
FROM pg_class as c,pg_attribute as a inner join pg_type on pg_type.oid = a.atttypid
where c.relname = '表名' and a.attrelid = c.oid and a.attnum>0

get表名：

select * from  pg_tables where schemaname='public'