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pgsql 实现用户自定义表结构信息获取

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1. 获取表中普通信息:如字段名,字段类型等 。

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SELECT column_name, data_type, ordinal_position, is_nullable
FROM information_schema. "columns"
WHERE "table_name" = 'TABLE-NAME' -- 将 'TABLE-NAME' 换成自己的表

2.获取所有的表和视图 。

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SELECT table_name, table_type FROM INFORMATION_SCHEMA.tables WHERE table_schema= 'public' AND table_type IN ( 'BASE TABLE' , 'VIEW' )

3.获取约束注释 。

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SELECT obj_description(oid, 'pg_constraint' ) AS d FROM pg_constraint WHERE conname = constraint_name;

4.获取表的约束 。

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-- conname 约束名称
-- contype 约束类型(p:主键, f:外键, c: 检查约束, u:唯一约束)
-- conkey 约束字段
-- confkey 外键字段
-- consrc 检查约束条件
-- confreltable 外键字段引用的表
SELECT conname, contype, conkey, consrc,
   ( SELECT array_agg(column_name::text) FROM INFORMATION_SCHEMA.COLUMNS WHERE ordinal_position = any (conkey) AND table_name= 'TABLE-NAME' ) AS conkey,
   ( SELECT column_name FROM INFORMATION_SCHEMA.COLUMNS WHERE ordinal_position = any (confkey) AND table_name= 'TABLE-NAME' ) AS confkey,
   ( SELECT relname FROM pg_class WHERE oid = confrelid) AS confreltable
FROM pg_constraint WHERE conrelid=( SELECT oid FROM pg_class WHERE relname = 'TABLE-NAME' ); -- 将 'TABLE-NAME' 换成自己的表

5.获取表的触发器 。

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SELECT trigger_name, event_manipulation, event_object_table, action_statement, action_orientation, action_timing FROM INFORMATION_SCHEMA.TRIGGERS;

6.获取字段的注释 。

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--table_oid 表的oid
--col_position 字段的位置
SELECT col_description(table_oid, col_position);

补充:查询PostgreSQL库中所有表的表结构信息SQL 。

我就废话不多说了,大家还是直接看代码吧~ 。

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select
( select relname as comment from pg_class where oid=a.attrelid) as table_name,
  row_number() over(partition by ( select relname as comment from pg_class where oid=a.attrelid) order by a.attnum),
a.attname as column_name,
format_type(a.atttypid,a.atttypmod) as data_type,
( case when atttypmod-4>0 then atttypmod-4 else 0 end )data_length,
( case when ( select count (*) from pg_constraint where conrelid = a.attrelid and conkey[1]=attnum and contype= 'p' )>0 then '是' else '否' end ) as 主键约束,
( case when ( select count (*) from pg_constraint where conrelid = a.attrelid and conkey[1]=attnum and contype= 'u' )>0 then '是' else '否' end ) as 唯一约束,
( case when ( select count (*) from pg_constraint where conrelid = a.attrelid and conkey[1]=attnum and contype= 'f' )>0 then '是' else '否' end ) as 外键约束,
( case when a.attnotnull= true then '是' else '否' end ) as nullable,
col_description(a.attrelid,a.attnum) as comment
from pg_attribute a
where attstattarget=-1 and attrelid in ( select oid from pg_class where relname in ( select relname from pg_class where relkind = 'r' and relname
in
( select tablename from pg_tables where tablename not like 'pg_%' and tablename not like 'sql_%' and schemaname not in (XXXX) and tablename not in (XXXX)
))
order by table_name,a.attnum;

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我。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/rantengfei1986/article/details/56670712 。

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