postgresql 中分区表的创建及使用样例

create table maintb(id int,name varchar(10));

create table childtb_1 (CHECK ( id BETWEEN 1 AND 200)) inherits(maintb);

create table childtb_2 (CHECK ( id BETWEEN 201 AND 400)) inherits(maintb);

create table childtb_3 (CHECK ( id BETWEEN 401 AND 600)) inherits(maintb);

create table childtb_4 (CHECK ( id BETWEEN 601 AND 800)) inherits(maintb);

create table childtb_5 (CHECK ( id BETWEEN 801 AND 1000)) inherits(maintb);

CREATE INDEX childtb_idx_1 ON childtb_1 (id);

CREATE INDEX childtb_idx_2 ON childtb_2 (id);

CREATE INDEX childtb_idx_3 ON childtb_3 (id);

CREATE INDEX childtb_idx_4 ON childtb_4 (id);

CREATE INDEX childtb_idx_5 ON childtb_5 (id);

--创建存储过程

CREATE OR REPLACE FUNCTION maintb_insert_trigger()

RETURNS TRIGGER AS $$

BEGIN

IF( NEW.id BETWEEN 1 AND 200 ) THEN

INSERT INTO childtb_1 VALUES (NEW.*);

ELSIF( NEW.id BETWEEN 201 AND 400 ) THEN

INSERT INTO childtb_2 VALUES (NEW.*);

ELSIF( NEW.id BETWEEN 401 AND 600 ) THEN

INSERT INTO childtb_3 VALUES (NEW.*);

ELSIF( NEW.id BETWEEN 601 AND 800 ) THEN

INSERT INTO childtb_4 VALUES (NEW.*);

ELSIF( NEW.id BETWEEN 801 AND 1000 ) THEN

INSERT INTO childtb_5 VALUES (NEW.*);

ELSE

RAISE EXCEPTION 'id out of range!';

END IF;

RETURN NULL;

END;

$$

LANGUAGE plpgsql;

--创建触发器

CREATE TRIGGER insert_maintb_trigger

BEFORE INSERT ON maintb

FOR EACH ROW EXECUTE PROCEDURE maintb_insert_trigger();

CREATE TRIGGER insert_maintb_trigger

BEFORE INSERT ON maintb

FOR EACH ROW EXECUTE PROCEDURE maintb_insert_trigger();

insert into maintb values(1,'abcde12345');

insert into maintb values(300,'abcde300');

explain (format json) select * from maintb where id=2;