pg_class pg_class表记载表和几乎所有有字段或者是那些类似表的东西。 包括索引(不过还要参阅pg_index)、序列、视图、物化视图、 复合类型和一些特殊关系类型;参阅relkind。在下面, 当指所有这些对象的时候说"关系"(relations)。不是所有字段对所有关系类型都有意义。 表47-11.pg_class字段 pg_class中的几个布尔...
-- pg_class:postgreSQL内部表;记录表和几乎所有具有列或者像表的东西 -- TG_TABLE_NAME:数据类型是name,表示触发器作用的表的名字。它与变量TG_RELNAME的作用是一样的。 select count(*) INTO tbExist from pg_class where relname = (TG_TABLE_NAME||'_'||yearStr); -- 若不存在, 则插入前需 先创...
select c.relname 表名,cast(obj_description(relfilenode,'pg_class') as varchar) 名称,a.attname 字段,d.description 字段备注,concat_ws('',t.typname,SUBSTRING(format_type(a.atttypid,a.atttypmod) from '\(.*\)')) as 列类型 from pg_class c,pg_attribute a,pg_type t,pg_description d ...
http://www.cnblogs.com/stephen-liu74/archive/2011/12/28/2305415.html 一、pg_class 二、pg_attribute 三、pg_attrdef 四、pg_authid 五、pg_auth_members 六、pg_constraint 七、pg_tablespace 八、pg_namespace 九、pg_database 十、pg_index PostgreSQL学习手册(系统视图) http://www.cnblogs.com/step...
hastriggers pg_class.relhastriggers True if table has (or once had) triggers pg_attribute 用来存放字段信息 attname:字段名 col_description ( A.attrelid, A.attnum ) AS COMMENT:字段注释 attrelid:字段对应的表id(与class中的oid关联) pg_description 用来存储数据库对象(如字段、表)的描述(注释)...
.conrelid = pg_class.oid inner join pg_attribute on pg_attribute.attrelid = pg_class.oid and pg_attribute.attnum = any(pg_constraint.conkey) inner join pg_type on pg_type.oid = pg_attribute.atttypid where pg_class.relname = c.relname and pg_constraint.contype = 'p' and pg_...
select relname as TABLE_NAME, reltuples as rowCounts from pg_class where relkind = 'r' order by rowCounts desc 7、查看数据库表对应的数据文件 select pg_relation_filepath('product'); 五、数据库分析 1、查看数据库实例的版本 select version(); ...
这里值得一提的是每次表被freeze 之后,会更新pg_class 中的relfrozenxid 列为本次freeze的XID。表年龄就是当前的最新的XID 与relfrozenxid的差值,而元组年龄可以理解为每个元组的t_xmin与relfrozenxid的差值。所以,这个参数也可以被简单理解为每个元组两次被freeze之间的XID 差值的一个最小值。增大该参数可以避免...
pg_class.relname as 表名, cast(obj_description(pg_class.relfilenode,'pg_class') as varchar) as 表中文描述, '' as 表类型, '' as 表创建时间, pg_attribute.attnum as 字段编号, pg_attribute.attname as 字段名, col_description(pg_attribute.attrelid,pg_attribute.attnum) as 字段描述, ...
I need to find a way (if possible) to make a PHP class accept a PgSql\Result object as an attribute. PHP 8.1+ has migrated the pgsql result resource to the PgSQL\Result instance. In prior versions of PHP I could set the attribute like this:...