postgresql 实现获取所有表名,字段名,字段类型,注释

获取表名及注释：

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：

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

SELECT string_agg(DISTINCT t3.attname,',') AS PrimaryKeyColumn ,t4.tablename AS tableName , string_agg(cast(obj_description(relfilenode,'pg_class') as VARchar),'') as commentFROM 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.attnumWHERE 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。如有错误或未考虑完全的地方，望不吝赐教。

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