pgsql 实现用户自定义表结构信息获取

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

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

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

-- 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

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

--table_oid 表的oid

--col_position 字段的位置

SELECT col_description(table_oid, col_position);

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;