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 Post subject: Running a MySQL native query which uses user-defined
PostPosted: Mon Nov 14, 2016 5:14 pm 
Newbie

Joined: Mon Nov 14, 2016 4:16 pm
Posts: 5
I have a Java application which runs MySQL queries in Hibernate.

I am now trying to execute the following MySQL query in hibernate which uses user-defined variables.
I have overcome the issue surrounding ':=' assignments, by adding two backslashes. The compiler is no longer complaining about this, but when I try to execute this query from within my application, it displays the following error message:

"You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'PREPARE stmt1 from @sql_max; EXECUTE stmt1' at line 1"

My query in Java/hibernate is as follows:
Code:
    private static final String COUNT_INTERQUARTILE_SQL
=  " SET @sql_max \\:=('SELECT ''Max'' AS quartile, max(visit.id) as id " +
   " FROM carecube.visit order by visit.id ');" +
   " PREPARE stmt1 from @sql_max;" +
   " EXECUTE stmt1;";


Could an experienced Hibernate and/or MySQL expert spot my syntax issues? Thank you all for your help!


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 Post subject: Re: Running a MySQL native query which uses user-defined
PostPosted: Tue Nov 15, 2016 1:16 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1638
Location: Romania
You don't need to prepare/execute the statement manually because that's the job of a JDBC PreparedStatement, which Hibernate uses behind the scenes.

This is how you should run your SQL query:

Code:
List<Object[]> result = session.createSQLQuery(
" SELECT 'Max' AS quartile, max(visit.id) as id " +
" FROM carecube.visit order by visit.id")
.list();

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 Post subject: Re: Running a MySQL native query which uses user-defined
PostPosted: Tue Nov 15, 2016 4:39 am 
Newbie

Joined: Mon Nov 14, 2016 4:16 pm
Posts: 5
Thanks for your reply.

I am referencing that query by calling it within this function which looks similar to yours.

Code:
public List<ProcedureDuration> interQuartileRange() {
      // TODO Auto-generated method stub
      return this.template.execute(new HibernateCallback<List<ProcedureDuration>>() {

         @SuppressWarnings("unchecked")
         @Override
         public List<ProcedureDuration> doInHibernate(Session session) throws HibernateException {
            Query query = session.createSQLQuery(COUNT_INTERQUARTILE_SQL);
            //return InterQuartileRange.newInstance(query.list());
            //return (List<TotalCaseNumbers>)query.list();
            return (List<ProcedureDuration>)query.list();
         }
      });
   }


Can Hibernate read user-defined variables?

Thanks.


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 Post subject: Re: Running a MySQL native query which uses user-defined
PostPosted: Tue Nov 15, 2016 6:32 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1638
Location: Romania
No, it can not.

You can call stored procedures or database functions, as explained in this article, but you cannot extract user-defined variables like you want, and you don't even need to do so. You can use the ResultSet instead.

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If you liked my answer, you are going to love my High-Performance Java Persistence book and my blog as well.


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