我需要实现在分区表中通过ON CONFLICT()更新行的功能。
到目前为止,我的尝试如下:
表创建:
CREATE TABLE public.my_tbl
(
goid character varying(255) NOT NULL,
timestamps timestamp without time zone[],
somenumber numeric[],
CONSTRAINT my_tbl_pkey PRIMARY KEY (goid)
)
WITH (
OIDS=FALSE
);
ALTER TABLE public.my_tbl
OWNER TO postgres;
表序列:
CREATE SEQUENCE public.fixations_data_pkey_seq
INCREMENT 1
MINVALUE 1
MAXVALUE 9223372036854775807
START 1
CACHE 1;
ALTER TABLE public.fixations_data_pkey_seq
OWNER TO postgres;
表分区触发器,可以创建名称为“table_YYYY_MM_DD”的新表,其中“YYYY_MM_DD”表示当前日期(查询执行日期):
CREATE OR REPLACE FUNCTION public.my_tbl_insert_trigger()
RETURNS trigger AS
$BODY$
DECLARE
table_master varchar(255) := 'my_tbl';
table_part varchar(255) := '';
BEGIN
-- Partition table name --------------------------------------------------
table_part := table_master
|| '_' || DATE_PART( 'year', NOW() )::TEXT
|| '_' || DATE_PART( 'month', NOW() )::TEXT
|| '_' || DATE_PART( 'day', NOW() )::TEXT;
-- Check if partition exists --------------------------------
PERFORM
1
FROM
pg_class
WHERE
relname = table_part
LIMIT
1;
-- If not exist, create new one --------------------------------------------
IF NOT FOUND
THEN
-- Create parition, which inherits master table --------------------------
EXECUTE '
CREATE TABLE ' || table_part || '
(
goid character varying(255) NOT NULL DEFAULT nextval(''' || table_master || '_pkey_seq''::regclass),
CONSTRAINT ' || table_part || '_pkey PRIMARY KEY (goid)
)
INHERITS ( ' || table_master || ' )
WITH ( OIDS=FALSE )';
-- Create indices for current table-------------------------------
EXECUTE '
CREATE INDEX ' || table_part || '_adid_date_index
ON ' || table_part || '
USING btree
(goid)';
END IF;
-- Insert row into table (without ON CONFLICT)--------------------------------------------
EXECUTE '
INSERT INTO ' || table_part || '
SELECT ( (' || QUOTE_LITERAL(NEW) || ')::' || TG_RELNAME || ' ).*';
RETURN NULL;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION public.my_tbl_insert_trigger()
OWNER TO postgres;
CREATE TRIGGER my_tbl_insert_trigger
BEFORE INSERT
ON my_tbl
FOR EACH ROW
EXECUTE PROCEDURE my_tbl_insert_trigger();
我可以在此之后向表中插入新行:
INSERT INTO my_tbl (goid, timestamps, somenumber)
VALUES ('qwe123SSsssa3', '{"2016-11-16 00:00:00", "2016-11-16 01:00:00"}', '{3, 12333}')
但是当我尝试进行UPSERT时:
INSERT INTO my_tbl (goid, timestamps, somenumber)
VALUES ('qwe123SSsssa3', '{"2016-11-16 02:00:00"}', '{999}')
ON CONFLICT (goid)
DO UPDATE
SET timestamps=array_append(my_tbl.timestamps::timestamp[], '2016-11-16 02:00:00'),
somenumber=array_append(my_tbl.somenumber,'999');
我遇到了重复主键错误。
我猜想,我需要在触发器函数的第三个EXECUTE中添加ON CONFLICT。但是我应该怎么做呢?