PostgreSQL表结构【仅需要写数据库文档时使用】

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select
    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 'Y' else 'N' 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 'Y' else 'N' 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 'Y' else 'N' end) as 外键约束,
    (case when a.attnotnull=true then 'Y' else 'N' end) as nullable,
col_description(a.attrelid,a.attnum) as comment
from pg_attribute a
where attstattarget=-1 and attrelid = (select oid from pg_class where relname ='table_name'); -- 表名