PostgreSQL LIST分割槽實現：繼承表+函式+觸發器。

======實現LIST分割槽：
PostgreSQL LIST分割槽實現：繼承表+函式+觸發器。

1、建表
create table tbl(a int, b varchar(10));
create table tbl_1 (check ( b = 'jason')) INHERITS (tbl);
create table tbl_2 (check ( b = 'lucy')) INHERITS (tbl);
create table tbl_other (check( b not in ('lucy','jason'))) INHERITS (tbl);

2、建立函式
CREATE OR REPLACE FUNCTION tbl_part_tg()
RETURNS TRIGGER AS $$
BEGIN
 IF ( NEW.b = 'jason' ) THEN
  INSERT INTO tbl_1 VALUES (NEW.*);
 ELSIF ( NEW.b = 'lucy') THEN
  INSERT INTO tbl_2 VALUES (NEW.*);
 ELSIF (NEW.b not in ('jason','lucy')) THEN
  INSERT INTO tbl_other VALUES (NEW.*);
 END IF;
  RETURN NULL;
END;
 $$
LANGUAGE plpgsql;

3、建立觸發器
CREATE TRIGGER insert_tbl_part_tg
     BEFORE INSERT ON tbl
FOR EACH ROW EXECUTE PROCEDURE tbl_part_tg();

4、插入資料
insert into tbl values(1,'jason');
insert into tbl values(2,'lucy');
insert into tbl values(3,'baichi');
insert into tbl values(4,'baichi1');
insert into tbl values(5,'baichi2');

5、結果
postgres=# select * from tbl_1;
 a |   b  
---+-------
 1 | jason
(1 row)

postgres=# select * from tbl_2;
 a |  b  
---+------
 2 | lucy
(1 row)
                     
postgres=# select * from tbl_other;
 a |    b   
---+---------
 3 | baichi
 4 | baichi1
 5 | baichi2
(3 rows)

postgres=# select * from tbl;
 a |    b   
---+---------
 1 | jason
 2 | lucy
 3 | baichi
 4 | baichi1
 5 | baichi2
(5 rows)

postgres=#