获取表名及注释：
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select relname as tabname, cast (obj_description(relfilenode, 'pg_class' ) as varchar ) as comment from pg_class c where relkind = 'r' and relname not like 'pg_%' and relname not like 'sql_%' order by relname |
过滤掉分表：
加条件 and relchecks=0 即可
获取字段名、类型、注释、是否为空：
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SELECT col_description(a.attrelid,a.attnum) as comment,format_type(a.atttypid,a.atttypmod) as type,a.attname as name , a.attnotnull as notnull FROM pg_class as c,pg_attribute as a where c.relname = '表名' and a.attrelid = c.oid and a.attnum>0 |
补充：PostgreSQL查询表主键及注释内容
网上关于pgSql获取表主键的内容都是千篇一律，并且对于存在多主键的场景不支持。
附上测试后可获取多个主键字段值的SQL
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SELECT string_agg( DISTINCT t3.attname, ',' ) AS primaryKeyColumn ,t4.tablename AS tableName , string_agg( cast (obj_description(relfilenode, 'pg_class' ) as varchar ), '' ) as comment FROM pg_constraint t1 INNER JOIN pg_class t2 ON t1.conrelid = t2.oid INNER JOIN pg_attribute t3 ON t3.attrelid = t2.oid AND array_position(t1.conkey,t3.attnum) is not null INNER JOIN pg_tables t4 on t4.tablename = t2.relname INNER JOIN pg_index t5 ON t5.indrelid = t2.oid AND t3.attnum = ANY (t5.indkey) LEFT JOIN pg_description t6 on t6.objoid=t3.attrelid and t6.objsubid=t3.attnum WHERE t1.contype = 'p' AND length(t3.attname) > 0 AND t2.oid = '表名' :: regclass group by t4.tablename |
目前只找到了获取指定表的主键信息，对于批量获取没有找到。
以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。如有错误或未考虑完全的地方，望不吝赐教。
原文链接：https://blog.csdn.net/cicon/article/details/51577655
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