Question

我需要在分区表中实现更新（通过ON CONFLICT（））行。
到目前为止，我的尝试：
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，用于创建名为＆＃34; table_YYYY_MM_DD＆＃34;的新表，其中＆＃34; YYYY_MM_DD＆＃34; - 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();

在此之后，我可以在表中插入新行：

INSERT INTO my_tbl (goid, timestamps, somenumber)
VALUES ('qwe123SSsssa3', '{"2016-11-16 00:00:00", "2016-11-16 01:00:00"}', '{3, 12333}')

但是当我试图做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');

我正在发生DUPLICATE PKEY错误。
我想，我必须在触发功能中将ON CONFLICT添加到第三个EXECUTE。但是我应该怎么做呢？

Answer 1

好吧，我已经将我的第三个EXECUTE改为：

    -- Insert row into table (with ON CONFLICT)--------------------------------------------
EXECUTE '
INSERT INTO ' || table_part || ' 
SELECT ( (' || QUOTE_LITERAL(NEW) || ')::' || TG_RELNAME || ' ).*
ON CONFLICT (goid)
DO UPDATE
SET timestamps=' || table_part || '.timestamps::timestamp[] || ' || QUOTE_LITERAL(NEW.timestamps) || ',
somenumber=' || table_part || '.somenumber::numeric[] || ' || QUOTE_LITERAL(NEW.somenumber) || '
';

RETURN NULL;

现在，当我执行查询时：

INSERT INTO my_tbl (goid, timestamps, somenumber)
VALUES ('potato_1', ARRAY['2016-11-16 12:00:00', '2016-11-16 15:00:00']::timestamp[], ARRAY[223, 211]::numeric[]);

没有任何错误，它像我预期的那样扩展了数组类型的列我可以承认这是一个肮脏的解决方案，但它似乎有效。
如果有人有更好的解决方案，我很高兴看到它。

PostgreSQL 9.5在分区表时插入/更新

1 个答案: