Question

寻找有关PostgreSQL触发器的一些建议和帮助。我有3个表，我正在尝试使用触发器。

以下是他们的描述：

\d staging_assets;
                Table "public.staging_assets"
       Column        |         Type          |   Modifiers   
---------------------+-----------------------+---------------
 pipe_id             | character varying(25) | not null
 kind                | character varying(25) | 
 pipe_jt_num         | character varying(25) | 
 pipe_heat           | character varying(25) | 
 pipe_length         | numeric(4,2)          | 
 pipe_wall_thickness | numeric(4,3)          | default 0.000
 degree              | numeric(4,2)          | default 0
Indexes:
    "staging_assets_pkey" PRIMARY KEY, btree (pipe_id)
Check constraints:
    "kind_chk" CHECK (upper(kind::text) = 'BEND'::text OR upper(kind::text) = 'PIPE_JOINT'::text) NO INHERIT
Triggers:
    distinquish AFTER INSERT ON staging_assets FOR EACH ROW EXECUTE PROCEDURE move_along()

\d bend_assets;
               Table "public.bend_assets"
     Column     |         Type          |   Modifiers   
----------------+-----------------------+---------------
 custom_id      | character varying(20) | not null
 bnd_pipe_id    | character varying(20) | 
 bnd_heat       | character varying(20) | 
 bnd_length     | numeric(3,1)          | 
 degree         | numeric(3,1)          | 
 wall_thickness | numeric(4,3)          | default 0.000
Indexes:
    "bend_assets_pkey" PRIMARY KEY, btree (custom_id)
Check constraints:
    "bnd_len_chk" CHECK (bnd_length > 0.0)
Referenced by:
    TABLE "weld_log" CONSTRAINT "weld_log_bnd_c

onnect_fkey" FOREIGN KEY (bnd_connect) REFERENCES bend_assets(custom_id)

\d pup_assets;
                 Table "public.pup_assets"
       Column       |         Type          |   Modifiers   
--------------------+-----------------------+---------------
 custom_pup_id      | character varying(20) | not null
 pup_pipe_id        | character varying(20) | 
 pup_heat           | character varying(20) | 
 pup_length         | numeric(3,1)          | 
 pup_wall_thickness | numeric(4,3)          | default 0.000
Indexes:
    "pup_assets_pkey" PRIMARY KEY, btree (custom_pup_id)
Check constraints:
    "pup_len_chk" CHECK (pup_length > 0.0)
Referenced by:
    TABLE "weld_log" CONSTRAINT "weld_log_pup2_connect_fkey" FOREIGN KEY (pup2_connect) REFERENCES pup_assets(custom_pup_id)
    TABLE "weld_log" CONSTRAINT "weld_log_pup_connect_fkey" FOREIGN KEY (pup1_connect) REFERENCES pup_assets(custom_pup_id)

我的目标是无论何时将记录插入staging_assets表，它都会插入pup_assets或bend_assets表中，具体取决于staging_assets中的值。 1}} kind列。我对条件逻辑使用CASE语句。

这是我到目前为止尝试的触发器功能：

CREATE OR REPLACE FUNCTION move_along()
 RETURNS trigger
AS $CORRECTING$
 BEGIN
 CASE 
 WHEN NEW.kind = 'BEND'
 THEN INSERT INTO bend_assets(custom_id, bnd_pipe_id, bnd_heat, bnd_length, degree, wall_thickness)
 SELECT NEW.pipe_id, NEW.pipe_jt_num, NEW.pipe_heat, NEW.pipe_length, NEW.degree, NEW.pipe_wall_thickness
 FROM staging_assets sa;
 RETURN NEW;
 WHEN NEW.kind = 'PIPE_JOINT'
 THEN INSERT INTO pup_assets(custom_pup_id, pup_pipe_id, pup_heat, pup_length, pup_wall_thickness)
 SELECT NEW.pipe_id, NEW.pipe_jt_num, NEW.pipe_heat, NEW.pipe_length, NEW.pipe_wall_thickness
 FROM staging_assets sa;
 RETURN NEW;
 ELSE
 RAISE NOTICE 'Not a valid kind type';
 END CASE;
 RETURN NULL;
 END;
$CORRECTING$
LANGUAGE PLpgSQL;

实际的触发器定义是：

CREATE TRIGGER distinquish
AFTER INSERT 
ON staging_assets
FOR EACH row
 EXECUTE PROCEDURE move_along();

为PIPE_JOINT＆＃39;尝试单个插入时kind这有效，并且会将记录插入pup_assets表：

INSERT INTO staging_assets
VALUES('Joint-1','PIPE_JOINT','9892','Heat-61',18.45,0.290,0);
INSERT 0 1
fab_tracking=> TABLE staging_assets;
 pipe_id |    kind    | pipe_jt_num | pipe_heat | pipe_length | pipe_wall_thickness | degree 
---------+------------+-------------+-----------+-------------+---------------------+--------
 Joint-1 | PIPE_JOINT | 9892        | Heat-61   |       18.45 |               0.290 |   0.00
(1 row)

fab_tracking=> TABLE pup_assets;
 custom_pup_id | pup_pipe_id | pup_heat | pup_length | pup_wall_thickness 
---------------+-------------+----------+------------+--------------------
 Joint-1       | 9892        | Heat-61  |       18.5 |              0.290
(1 row)

再次为“BEND”执行单个插入操作。 kind值有效：

INSERT INTO staging_assets
VALUES('Joint-2','BEND','1892','Heat-41',10.45,0.290,7.50);
INSERT 0 1
fab_tracking=> TABLE staging_assets;
 pipe_id |    kind    | pipe_jt_num | pipe_heat | pipe_length | pipe_wall_thickness | degree 
---------+------------+-------------+-----------+-------------+---------------------+--------
 Joint-1 | PIPE_JOINT | 9892        | Heat-61   |       18.45 |               0.290 |   0.00
 Joint-2 | BEND       | 1892        | Heat-41   |       10.45 |               0.290 |   7.50
(2 rows)

fab_tracking=> TABLE bend_assets;
 custom_id | bnd_pipe_id | bnd_heat | bnd_length | degree | wall_thickness 
-----------+-------------+----------+------------+--------+----------------
 Joint-2   | 1892        | Heat-41  |       10.5 |    7.5 |          0.290
(1 row)

然而，当我尝试多次插入时，我遇到了问题：

INSERT INTO staging_assets
VALUES ('Joint-3', 'BEND', '8989A', 'Heat-171', 12.33, 0.387, 5.75),
('Joint-4', 'PIPE_JOINT', '4984A', 'Heat-141', 22.33, 0.387, 0.0);

ERROR:  duplicate key value violates unique constraint "pup_assets_pkey"
DETAIL:  Key (custom_pup_id)=(Joint-4) already exists.
CONTEXT:  SQL statement "INSERT INTO pup_assets(custom_pup_id, pup_pipe_id, pup_heat, pup_length, pup_wall_thickness)
                 SELECT NEW.pipe_id, NEW.pipe_jt_num, NEW.pipe_heat, NEW.pipe_length, NEW.pipe_wall_thickness
                FROM staging_assets sa"
PL/pgSQL function move_along() line 8 at SQL statement

我很困惑为什么我在pup_assets表中获取Joint-4的唯一约束的错误键以及为什么触发器不能使用多个插入。检查pup_assets表时，那里没有Joint-4。

fab_tracking=> TABLE pup_assets;
 custom_pup_id | pup_pipe_id | pup_heat | pup_length | pup_wall_thickness 
---------------+-------------+----------+------------+--------------------
 Joint-1       | 9892        | Heat-61  |       18.5 |              0.290
(1 row)

寻找任何帮助，以了解为什么失败以及如何修复它以执行多个插入。我很感激任何建议。谢谢。

执行多个插入时PostgreSQL触发器错误

0 个答案: