Unable to use seq.nextval to insert into Parent table and the parent id in Child table

Hi Friends,

I am having having a table t_questions (Parent Table) and t_answers (Child Table)in oracle 11g.


QID - Number(10) (Primary Key)

Question- Varchar2(100)


AID- Number(10)

Answer- Varchar2(100)

QID - Number(10) (Foreign Key)

I developed front for adding question and multiple answers to the question in the same screen and saving it using SAVE button once ( eg, Q1. What is your Favorite color? Ans.1 Green, Ans.2 Red, Ans.3 Yellow). While inserting I used sequence.nextval to populate Primary key for QID( i,e 1), I inserted the question in the t_question table and using the same QID i tried to insert into the foreign key column in the t_answers table.

But I am getting error, in the answer table its trying to insert the QID value as 2, sequence.nextval is called again and value is incremented.

class User extends QActiveRecord


public $sequenceName = 'USERS_SEQ'; 

If i try to use sequence.currval, I am having doubt, before fetching the currval, there may be concurrent users who will try to insert the record in the t_question table, I fear I may get irrelavant value.

My DB team is not permitting to use trigger to insert the primary key value

Kindly help me to solve this issue.

You have 2 options

[list=1][]if you want to be really sure about sequence, trigger it by yourself and get its value[]keep using curval since is session safe


http://stackoverflow…rency-in-oracle[/list]As proof that currval is session safe, if you call it without calling nextval before, it will trow an error even if nextval was called in another db session.