postgresql 查询表注释 和 字段注释

表注释：

with tmp_tab as (
    select pc.oid as ooid,pn.nspname,pc.*
      from pg_class pc
           left outer join pg_namespace pn
                        on pc.relnamespace = pn.oid
      where 1=1
       and pc.relkind in ('r','v','m','f','p')
       and pn.nspname not in ('pg_catalog','information_schema') -- select pn.oid, pn.* from pg_namespace pn where 1=1
       and pn.nspname not like 'pg_toast%'
       /*and pc.oid not in (
          select inhrelid
            from pg_inherits
       )*/
    order by pc.relname
),tmp_desc as (
   select pd.*
     from pg_description pd
    where 1=1
      and pd.objsubid = 0 --objsubid 对于一个表列上的一个注释，这里是列号（objoid和classoid指表本身）。对所有其他对象类型，此列为0。
      --and pd.objoid=168605
)
select t0.*,
       case when t0.relkind in ('r','p')
                 then 'comment on table '||t0.nspname||'.'||t0.relname||' is '''||coalesce(t0.description,'')||''';' 
            when t0.relkind='v' 
                 then 'comment on view '||t0.nspname||'.'||t0.relname||' is '''||coalesce(t0.description,'')||''';' 
        end as table_description
  from (
        select tab.nspname,
               tab.relname,
               tab.relkind,
               de.description
          from tmp_tab tab
               left outer join tmp_desc de
                            on tab.ooid = de.objoid 
         where 1=1    
        ) t0
 where 1=1
   and t0.description like '%教师%'
order by t0.nspname,t0.relname   
;

 

 

字段注释：

with tmp_tab as (
    select pc.oid as ooid,pn.nspname,pc.*
      from pg_class pc
           left outer join pg_namespace pn
                        on pc.relnamespace = pn.oid
      where 1=1
       and pc.relkind in ('r','v','m','f','p')
       and pn.nspname not in ('pg_catalog','information_schema') -- select pn.oid, pn.* from pg_namespace pn where 1=1
       and pn.nspname not like 'pg_toast%'
       /*
       and pc.oid not in (
          select inhrelid
            from pg_inherits
       )*/
    order by pc.relname
),tmp_col as (
   select pa.*
     from pg_attribute pa
    where 1=1
      --and pa.attrelid = 168605
      and pa.attisdropped = false
      and pa.attname not in (
      'tableoid',
      'cmax',
      'xmax',
      'cmin',
      'xmin',
      'ctid'
      )
),tmp_desc as (
   select pd.*
     from pg_description pd
    where 1=1
      and pd.objsubid <> 0 --objsubid 对于一个表列上的一个注释，这里是列号（objoid和classoid指表本身）。对所有其他对象类型，此列为0。
      --and pd.objoid=168605
)
select t0.*,
       'comment on COLUMN '||t0.nspname||'.'||t0.relname||'.'||t0.attname||' is '''||coalesce(t0.description,'')||''';' as column_description
  from (
        select tab.nspname,
               tab.relname,
               tc.attname,
               tc.attnum,
               de.description
          from tmp_tab tab
               left outer join tmp_col tc
                            on tab.ooid = tc.attrelid
               left outer join tmp_desc de
                            on tc.attrelid = de.objoid and tc.attnum = de.objsubid
       ) t0
 where 1=1
   --and t0.description like '%教师%'
order by t0.nspname,t0.relname, t0.attnum

 表数据搜索：

DO $$
DECLARE
  pattern text := '%扣分%';
  value int := 0;
  sql text := '';
  rec1 record;
  rec2 record;
BEGIN
  DROP TABLE IF EXISTS _x;
  CREATE TEMPORARY TABLE _x (
    schema_name text, 
    table_name text, 
    column_name text,
    found text
  );
  FOR rec1 IN 
        SELECT table_schema, table_name, column_name
        FROM information_schema.columns 
        WHERE table_name <> '_x'
                AND UPPER(column_name) LIKE UPPER('%%')                  
                AND table_schema <> 'pg_catalog'
                AND table_schema <> 'information_schema'
                AND data_type IN ('character varying', 'text', 'character', 'char', 'varchar')
        LOOP
    sql := concat('SELECT ', rec1."column_name", ' AS "found" FROM ',rec1."table_schema" , '.',rec1."table_name" , ' WHERE UPPER(',rec1."column_name" , ') LIKE UPPER(''', pattern , ''')');
    RAISE NOTICE '%', sql;
    BEGIN
        FOR rec2 IN EXECUTE sql LOOP
            RAISE NOTICE '%', sql;
            INSERT INTO _x VALUES (rec1."table_schema", rec1."table_name", rec1."column_name", rec2."found");
        END LOOP;
    EXCEPTION WHEN OTHERS THEN
    END;
  END LOOP;
  END; $$;

SELECT * FROM _x;