In Oracle how do I save a sequence.nextval in a variable to be reused in multiple inserts?
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16-10-2019 - |
Question
I'm writing a script to populate some tables with data for testing.
I would like to write something like the following but I don't know how to do it (I'm Oracle 11g)
SET ENABLED_USER_ID = SEQ.NEXTVAL; // PSEUDOCODE
SET DISABLED_USER_ID = SEQ.NEXTVAL; // PSEUDOCODE
INSERT INTO USERS
(ID, USR_NAME)
VALUES (:ENABLED_USER_ID, 'ANDREW');
INSERT INTO CAR
(CAR_ID, CAR_NAME, USR_ID)
VALUES (CARSEQ.NEXTVAL, 'FORD', :ENABLED_USER_ID);
INSERT INTO USERS
(ID, USR_NAME)
VALUES (:DISABLED_USER_ID, 'ANDREW');
INSERT INTO CAR
(CAR_ID, CAR_NAME, USR_ID)
VALUES (CARSEQ.NEXTVAL, 'FORD', :DISABLED_USER_ID);
I know I could rearrange the queries and use the sequence.currval
reference, but I'd prefer to have the id saved in properly named variables.
Maybe I should just wrap the script in a DECLARE ... BEGIN ... END;
but I'm hoping there is a more concise way to do it.
Addition 27 May 2011 15:31
It seems that in any case I have to declare the variables in a DECLARE
block. So I'm trying with
DECLARE
USER_ID NUMBER(10,0) := 1;
BEGIN
insert into TEST_USER
values (user_id, 'andrew', sysdate);
END;
but I get the following error
Caused by: java.sql.SQLException: ORA-06550: **line 2, column 27:** PLS-00103: Encountered the symbol "end-of-file" when expecting one of the following: * & = - + ; < / > at in is mod remainder not rem <an exponent (**)> <> or != or ~= >= <= <> and or like like2 like4 likec between || multiset member submultiset
That points to the variable declaration.
I'm using java to load the script from a file and running it using the Oracle JDBC driver (ojdbc14-10.2.0.4.0.jar) on a Oracle 11g server.
The table TEST_USER has been created with
create table TEST_USERS (
id number(10, 0) not null,
name varchar2(100),
date_ins date default sysdate,
primary key (id)
);
Solution
I think it goes like this
DECLARE
ENABLED_USER_ID PLS_INTEGER;
DISABLED_USER_ID PLS_INTEGER;
BEGIN
ENABLED_USER_ID := SEQ.NEXTVAL;
DISABLED_USER_ID := SEQ.NEXTVAL;
INSERT INTO USERS (ID, USR_NAME)
VALUES (ENABLED_USER_ID, 'ANDREW');
INSERT INTO CAR (CAR_ID, CAR_NAME, USR_ID)
VALUES (CARSEQ.NEXTVAL, 'FORD', ENABLED_USER_ID);
INSERT INTO USERS (ID, USR_NAME)
VALUES (DISABLED_USER_ID, 'ANDREW');
INSERT INTO CAR (CAR_ID, CAR_NAME, USR_ID)
VALUES (CARSEQ.NEXTVAL, 'FORD', DISABLED_USER_ID);
END;
/
OTHER TIPS
You will need a block if you are declaring variables
With 11g, support for sequences has been improved so you can use them like:
ENABLED_USER_ID := SEQ.NEXTVAL;
rather than using a select
statement (though both will work)
Other options for persisting the values include saving them to a table or creating a context, but I think sequence.currval
is really the 'right answer' here
SELECT seq.nextval
INTO ENABLED_USER_ID
FROM dual;
I think you can actually get away without any extra variables by using currval
:
INSERT INTO USERS
(ID, USR_NAME)
VALUES (SEQ.NEXTVAL, 'ANDREW');
INSERT INTO CAR
(CAR_ID, CAR_NAME, USR_ID)
VALUES (CARSEQ.NEXTVAL, 'FORD', SEQ.CURRVAL);