PostGreSql学习笔记002---Navicat Premium中管理PostGreSql 错误:字段rolcatupdate 不存在

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1.出现这个错误

2、错误原因

     在PostgreSQL数据库中，创建数据库表时，弹出上述错误提示框

3、解决办法

     利用SQL语句创建表

    create table t_student(

          id int,

          name varchar(12)

    );

具体原因分析:

PostgreSQL 9.5以前的版本，pg_authid有个字段rolcatupdate，用来标记用户是否有更新catalog的权限。 如果rolcatupdate=false，即使是超级用户也不能更新catalog。
但是在9.5以后，这个字段被删掉了，如下commit：
http://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=bb8582abf3c4db18b508627a52effd43672f9410

Remove rolcatupdate

This role attribute is an ancient PostgreSQL feature, but could only be
set by directly updating the system catalogs, and it doesn't have any
clearly defined use.

Author: Adam Brightwell <[email protected]>

因此你在9.5的版本看不到pg_authid的字段rolcatupdate了。
然而EDB有个用来增量同步Oracle, PostgreSQL数据的工具xDB，这个工具需要用到这个权限，更新pg_class.relhastriggers字段来禁用触发器。
例子：

digoal=# create table tab(id int);
CREATE TABLE
digoal=# create or replace function tg() returns trigger as $$
digoal$# declare
digoal$# begin
digoal$#   raise notice 'trigged';
digoal$#   return null;
digoal$# end;
digoal$# $$ language plpgsql strict;
CREATE FUNCTION
digoal=# create trigger tg after insert on tab for each row execute procedure tg();
CREATE TRIGGER
digoal=# insert into tab values (1);
NOTICE:  trigged
INSERT 0 1

更新pg_class.relhastriggers = false，就看不到这个触发器了。

digoal=# update pg_class set relhastriggers =false where relname='tab';
UPDATE 1
digoal=# insert into tab values (1);
INSERT 0 1
digoal=# insert into tab values (2);
INSERT 0 1
digoal=# insert into tab values (3);
INSERT 0 1
digoal=# \d+ tab
                         Table "public.tab"
 Column |  Type   | Modifiers | Storage | Stats target | Description 
--------+---------+-----------+---------+--------------+-------------
 id     | integer |           | plain   |              | 

digoal=# update pg_class set relhastriggers =true where relname='tab';
UPDATE 1
digoal=# \d+ tab
                         Table "public.tab"
 Column |  Type   | Modifiers | Storage | Stats target | Description 
--------+---------+-----------+---------+--------------+-------------
 id     | integer |           | plain   |              | 
Triggers:
    tg AFTER INSERT ON tab FOR EACH ROW EXECUTE PROCEDURE tg()

使用这种语法也可禁用触发器

digoal=# alter table tab disable trigger tg;
ALTER TABLE
digoal=# \d+ tab
                         Table "public.tab"
 Column |  Type   | Modifiers | Storage | Stats target | Description 
--------+---------+-----------+---------+--------------+-------------
 id     | integer |           | plain   |              | 
Disabled user triggers:
    tg AFTER INSERT ON tab FOR EACH ROW EXECUTE PROCEDURE tg()

这种方法禁用触发器实际上是改动pg_trigger.tgenabled

digoal=# \d pg_trigger
       Table "pg_catalog.pg_trigger"
     Column     |     Type     | Modifiers 
----------------+--------------+-----------
 tgrelid        | oid          | not null
 tgname         | name         | not null
 tgfoid         | oid          | not null
 tgtype         | smallint     | not null
 tgenabled      | "char"       | not null
 tgisinternal   | boolean      | not null
 tgconstrrelid  | oid          | not null
 tgconstrindid  | oid          | not null
 tgconstraint   | oid          | not null
 tgdeferrable   | boolean      | not null
 tginitdeferred | boolean      | not null
 tgnargs        | smallint     | not null
 tgattr         | int2vector   | not null
 tgargs         | bytea        | not null
 tgqual         | pg_node_tree | 
Indexes:
    "pg_trigger_oid_index" UNIQUE, btree (oid)
    "pg_trigger_tgrelid_tgname_index" UNIQUE, btree (tgrelid, tgname)
    "pg_trigger_tgconstraint_index" btree (tgconstraint)

digoal=# insert into tab values (2);
INSERT 0 1
digoal=# alter table tab enable trigger tg;
ALTER TABLE
digoal=# insert into tab values (2);
NOTICE:  trigged
INSERT 0 1

赋予普通用户alter table enable|disable trigger的权限

digoal=# grant trigger on table tab to digoal;
GRANT
digoal=# \c digoal digoal
digoal=# alter table tab disable trigger tg;
ALTER TABLE