| | |
| | | ----------------------------------------------------------------------------------------------------- |
| | | |
| | | show max_connections; |
| | | select count(1) from pg_stat_activity; |
| | | ----------------------------------------------------------------------------------------------------- a.查询表结构 |
| | |
| | | |
| | | select * from lf.sys_args; |
| | | ----------------------------------------------------------------------------------------------------- 递归查询 |
| | | --------------------------------------------------------- 查询菜单 |
| | | select * from lf.sys_menu; |
| | | |
| | | with recursive rs as( |
| | | select * from lf.sys_menu where id=1 |
| | | select * from lf.sys_menu where cn_name='管道基础大数据平台' |
| | | union |
| | | select a.* from lf.sys_menu a, rs b where a.pid=b.id |
| | | ) |
| | | select * FROM rs order by level||'-'||order_num; |
| | | --------------------------------------------------------- |
| | | with recursive rs as( |
| | | select a.* from lf.sys_menu a where id = 1 |
| | | union |
| | | select b.* from lf.sys_menu b |
| | | inner join rs on b.pid = rs.id |
| | | ) |
| | | select * FROM rs order by level,order_num |
| | | |
| | | -- API 如下 |
| | | connectby(text relname, -- 表名称 |
| | | text keyid_fld, -- id字段 |
| | | text parent_keyid_fld -- 父id字段 |
| | | [, text orderby_fld ], -- 排序字段 |
| | | text start_with, -- 起始行的id值 |
| | | int max_depth -- 树深度,0表示无限 |
| | | [, text branch_delim ]) -- 路径分隔符 |
| | | |
| | | -- 基本用法如下,必须通过AS子句定义返回的字段名称和类型 |
| | | select * |
| | | from connectby('demo.tree_data', 'id', 'pid', 'sort', '1', 0, '~') |
| | | as (id int, pid int, lvl int, branch text, sort int); |
| | | |
| | | select * from connectby('lf.sys_menu','id','pid','order_num','1',0,'-') |
| | | |
| | | |
| | | select * FROM rs order by order_num; |
| | | --------------------------------------------------------- 查询单位 |
| | | select * from lf.sys_dep; |
| | | |
| | | with recursive rs as( |
| | | select * from lf.sys_dep where id=1 |
| | | select * from lf.sys_dep where name='中国石油天然气管道工程有限公司' |
| | | union |
| | | select a.* from lf.sys_dep a, rs b where a.pid=b.id |
| | | ) |
| | | select * FROM rs order by level,order_num; |
| | | ------------------------------------------------------------------------------------------------------------------ |
| | | select * FROM rs order by order_num; |
| | | --------------------------------------------------------- 数据目录 |
| | | select * from lf.sys_dir; |
| | | |
| | | with recursive rs as( |
| | | select * from lf.sys_dir where name='中俄东线管道工程南段' |
| | | union |
| | | select a.* from lf.sys_dir a, rs b where a.pid=b.id |
| | | ) |
| | | select * FROM rs order by order_num; |
| | | ----------------------------------------------------------------------------------------------------- |
| | | |
| | | |
| | | |