Trigger - use one to create primary key values

I'm stuck on a simple use to do a TRIGGER that fires when you add new rows to a table and want to Developer SQL to add the primary key value.

I seem to be able to relax, but it is not inserted the primary key but giving a SQL error: ORA-00947: not enough values.

Here's what I have.

CREATE TABLE HF_fishers

(

contact_id INT NOT NULL

, name VARCHAR (25)

, last_name VARCHAR (35)

PRIMARY KEY (contact_id)

);

CREATE SEQUENCES HF_fishers_seq.

Then I ran the following trigger:

CREATE

HF_fishers_seq_trigger RELAXATION

BEFORE INSERTING

ON HF_fishers

FOR EACH LINE

BEGIN

IF (: new.contact_id IS NULL)

THEN

: NEW.contact_id: = NVL (: NEW.contact_id)

HF_fishers_seq. NEXTVAL

);

END IF;

END HF_fishers_seq_trigger;

=============

Then I executed the following SQL statement that gives the error.

INSERT INTO HF_fishers VALUES('Jacob','Muller');

But if I do everything is good except that it defeats the purpose of relaxation.

INSERT INTO HF_fishers VALUES(1,'Jacob','Muller');

MySQL has a nice 'AUTO_INCREMENT' command, but from what I understand in Oracle, I need to set up a trigger to automatically increment a column/cell, which in this case I use for the PRIMARY KEY.

3003916 wrote:

OK Jaramillo, I tried as you wrote, but what would be an INSERT statement correct?

-After the code trigger of Jaramillo

INSERT INTO HF_fishers (first_name, last_name) values ("Jesse", "Owens"); -I have the trigger but he made the mistake of duplicate key.

INSERT INTO HF_fishers values (hf_fishers_seq.nextval, 'Jesse', "Owens"); -No trigger but get key duplicated,.

INSERT INTO HF_fishers VALUES(:NEW_contact_id,'Jesse','Ownes'); -works without the trigger but the "get links" dialog box appears. So not much 'automatic' on this issue,.

My mistake. Here is the modified version of the trigger. I removed the CONDITIONAL clause and comes to be a part of the body of the trigger.

So, I created the table, the sequence, the relaxation and ran the first two insert statements and it worked fine. The third one you have invites SQL + or any tool you use to enter a value if she sees the ":" colon as a variable binding. Colon only works in a trigger without asking for confirmation.

Here is the code and my exit I ran home

DROP TABLE hf_fishers CASCADE CONSTRAINTS PURGE;
DROP SEQUENCE hf_fishers_seq;

CREATE TABLE hf_fishers
(
contact_id   INTEGER NOT NULL
,first_name   VARCHAR(25)
,last_name    VARCHAR(35)
,PRIMARY KEY (contact_id)
);

CREATE SEQUENCE hf_fishers_seq;

CREATE OR REPLACE TRIGGER hf_fishers_seq_trigger
   BEFORE INSERT
   ON hf_fishers
   FOR EACH ROW
BEGIN

   IF(:NEW.contact_id IS NULL) THEN
      :NEW.contact_id := hf_fishers_seq.NEXTVAL;
   END IF;

END hf_fishers_seq_trigger;

INSERT INTO hf_fishers(first_name, last_name)
     VALUES ('Jesse', 'Owens');  -- Works with the trigger

INSERT INTO hf_fishers
     VALUES (hf_fishers_seq.nextval, 'Jesse', 'Owens');  --Works without using the trigger body code.

SELECT *
  FROM hf_fishers;

COMMIT;

The output

Deleted table.

Elapsed time: 00:00:00.05

Sequence has fallen.

Elapsed time: 00:00:00.02

Table created.

Elapsed time: 00:00:00.03

Order of creation.

Elapsed time: 00:00:00.02

Trigger created.

Elapsed time: 00:00:01.05

1 line of creation.

Elapsed time: 00:00:00.04

1 line of creation.

Elapsed time: 00:00:00.01

CONTACT_ID FIRST NAME LAST NAME

---------- ------------------------- -----------------------------------

1 Jesse Owens

2 Jesse Owens

2 selected lines.

Elapsed time: 00:00:00.04

Validation complete.

Elapsed time: 00:00:00.01

Tags: Database

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