我有一个主表,例如
CREATE TABLE public.user_event_firebase
(
user_id character varying(32) COLLATE pg_catalog."default" NOT NULL,
event_name character varying(255) COLLATE pg_catalog."default" NOT NULL,
"timestamp" bigint NOT NULL,
platform character varying(255) COLLATE pg_catalog."default" NOT NULL,
created_at timestamp without time zone DEFAULT now()
)
WITH (
OIDS = FALSE
)
TABLESPACE pg_default;
目标
我想通过year_month表将此表分区为“ timestamp ”列,例如user_event_firebase_2018_04,user_event_firebase_2018_05,user_event_firebase_2018_06。行将自动重定向以插入具有时间戳条件的分区表。
我创建了功能创建分区,例如:
CREATE OR REPLACE FUNCTION partition_uef_table( bigint, bigint )
returns void AS $$
DECLARE
create_query text;
index_query text;
BEGIN
FOR create_query, index_query IN SELECT
'create table user_event_firebase_'
|| TO_CHAR( d, 'YYYY_MM' )
|| ' ( check( timestamp >= bigint '''
|| TO_CHAR( d, 'YYYY-MM-DD' )
|| ''' and timestamp < bigint '''
|| TO_CHAR( d + INTERVAL '1 month', 'YYYY-MM-DD' )
|| ''' ) ) inherits ( user_event_firebase );',
'create index user_event_firebase_'
|| TO_CHAR( d, 'YYYY_MM' )
|| '_time on user_event_firebase_'
|| TO_CHAR( d, 'YYYY_MM' )
|| ' ( timestamp );'
FROM generate_series( $1, $2, '1 month' ) AS d
LOOP
EXECUTE create_query;
EXECUTE index_query;
END LOOP;
END;
$$
language plpgsql;
CREATE OR REPLACE FUNCTION test_partition_function_uef()
RETURNS TRIGGER AS $$
BEGIN
EXECUTE 'insert into user_event_firebase_'
|| to_char( NEW.timestamp, 'YYYY_MM' )
|| ' values ( $1, $2, $3, $4 )' USING NEW.user_id, NEW.event_name, NEW.timestamp, NEW.platform;
RETURN NULL;
END;
$$
LANGUAGE plpgsql;
带触发器
CREATE TRIGGER test_partition_trigger_uef
BEFORE INSERT
ON user_event_firebase
FOR each ROW
EXECUTE PROCEDURE test_partition_function_uef() ;
我尝试使用示例
SELECT partition_uef_table(1518164237,1520583437) ;
问题:
ERROR: invalid input syntax for integer: "1 month"
LINE 14: FROM generate_series( $1, $2, '1 month' ) AS d
^
QUERY: SELECT
'create table user_event_firebase_'
|| TO_CHAR( d, 'YYYY_MM' )
|| ' ( check( timestamp >= bigint '''
|| TO_CHAR( d, 'YYYY-MM-DD' )
|| ''' and timestamp < bigint '''
|| TO_CHAR( d + INTERVAL '1 month', 'YYYY-MM-DD' )
|| ''' ) ) inherits ( user_event_firebase );',
'create index user_event_firebase_'
问题:
如何在'1个月'中为generate_series函数创建范围,将step
属性设置为int或bigint suck,因为每月的日期是不同的(第2天 - 第28天,第3天 - 第30天)。
谢谢。
答案 0 :(得分:1)
products
给予了回报:
with args(a1,a2) as (values(1518164237,1520583437))
select d,to_char(d,'YYYY_MM') from args, generate_series(to_timestamp(a1),to_timestamp(a2),'1 month'::interval) d;
generate_series(开始,停止,步骤间隔)时间戳或带时区的时间戳