pgsql 实现用户自定义表结构信息获取

1. 获取表中普通信息：如字段名，字段类型等

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

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

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

4.获取表的约束

-- 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 confreltableFROM 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

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

--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~

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 commentfrom pg_attribute awhere 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。如有错误或未考虑完全的地方，望不吝赐教。

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