How to write a native SQL query in Grails 2.4.0? - mysql

Question

I am working on Grails 2.4.0. I want to execute the native query in Groovy Controller. The query is as follow:
SELECT AVG(REPLACE(n.ep_text, 'PPM', '')), MONTH(n.date_creat)
from notification n
where n.type = 42
GROUP BY MONTH(n.date_creat)
Firstly, I execute the above query but it's have not found the REPLACE function like:
String query1 = "SELECT n.id, avg(REPLACE(n.epText, 'PPM', '')) FROM Notification as n";
def result = Notification.executeQuery(query1.toString())
How can I able to execute the REPLACE function in it?
And secondly, I have some R&D on it, but to execute the native query to required the sessionFactory. Unable to understand how to get the current session of Hibernate in Grails 2.4.0 to execute the native query?
Any help would be appreciated.

Answer 1

In order to use a native query, we can use SessionFactory, which is a bean and we can simply declare it to our Grails controller or service and dependency injection will handle it. Here is sample code using this bean to execute a native query.
class PublicService {
def sessionFactory
def getMatchedValue(){
def currentSession = sessionFactory.currentSession
def q = "select bank.id as id, bank.credit_amount as creditAmount, bank.debit_amount as debitAmount, bank.transaction_date as transactionDate, bank.transaction_name as transactionName, receipt.cr_date as crDate, receipt.picture_reference as pictureReference, receipt.receipt_date as receiptDate, receipt.reimbursment as reimbursment, receipt.total_amount as totalAmount, receipt.vendor as vendor " +
"from bank inner join receipt on bank.debit_amount=receipt.total_amount where ((bank.transaction_date >= receipt.receipt_date) and (bank.transaction_date <= DATE_ADD(receipt.receipt_date, INTERVAL 5 DAY) ))"//sample native query
def data = currentSession.createSQLQuery(q)
data.setResultTransformer(Criteria.ALIAS_TO_ENTITY_MAP);//if you are using alias for query e.g bank.credit_amount as creditAmount
final result = data.list()
return result
}
}