Question

I am using oracle11g as the database, and trying to do inserts into globalusers table from my grails service class.
I am retrieving the datasource in grails service like this:

import org.codehaus.groovy.grails.commons.ApplicationHolder as AH 
class UserImportService {
 def dataSource = AH.application.mainContext.dataSource
 def sql = new Sql(dataSource) ;
 String insertQuery="insert into GLOBALUSERS (..) values (..)
                try{
                    sql.execute(insertQuery)
                }
                catch(Exception e){

                    println "Failed to insert : " +insertQuery
                    println "Exception is:" + e;

                }
}

When I run the service from front end I get sql exception saying

Exception is:java.sql.SQLIntegrityConstraintViolationException: ORA-01400: cannot insert NULL into ("GRA"."GLOBALUSERS"."ID")

Since I am using a Datasource with my custom dialect which handles ID generation and autoincrement this should be handled by grail/hibernate.

When use the same datasource from other UI .. one by one.. it works..so the dialect is working fine. but this service for batch updates is not working.

Answer 1

Doing direct Sql on the dataSource bean is going to bypass Hibernate’s method of id generation, which, as I understand it, does a nextval() on the appropriate Oracle sequence. So your options are:

• Use Grails/GORM, where you create the object, populate, and .save()
• Query the sequence yourself, which would involve doing a nextval() on the sequence, but it would make your Sql Oracle-specific
• Add an Oracle trigger to the database, which tests if the primary key is set, and if it isn’t does the nextval() sequence query and adds it to the new database row. This will keep your direct Sql compatible with MySql autoincrement and Oracle sequences.