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 Post subject: Hibernate 4 and stored procedures for inserting records
PostPosted: Sun Feb 26, 2012 6:18 am 
Newbie

Joined: Sat Feb 18, 2012 11:31 am
Posts: 5
hello all, I need help with a stored procedure for inseting records in a postgres table:
i have the mapping file whith this configuration:
<hibernate-mapping>
<class name="blom.log.model.xhostclass" table="x_hosts">
<id name="iId" column="pk_codehost" type="int" unsaved-value="-1">
<generator class="identity">
</generator>
</id>
<property name="sHost" type="java.lang.String" access="field">
<column name="d_host" />
</property>

<sql-insert callable="true" check="none">
{call insert_host(:dHost)}
</sql-insert>


</class>
</hibernate-mapping>


My problem is that i don't know how to refer that in java code, how to execute the procedure. I'm trying something like

Transaction tx = null;
tx = session.beginTransaction();

Query query = session.getNamedQuery("insert_host");
query.setString("dHost", "host1");
query.executeUpdate();

but the error is Named query not known: insert_host

Any help please???
thanks in advance.


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 Post subject: Re: Hibernate 4 and stored procedures for inserting records
PostPosted: Mon Feb 27, 2012 4:27 am 
Expert
Expert

Joined: Tue Jun 16, 2009 3:36 am
Posts: 990
Hi acalle,

named queries are something completely different..

Your stored procedure should be called automatically when you persist (and then flush) new xhost instances:

Code:
xhostclass xhost = new xhostclass();
session.persist(xhost);
session.flush();


Furthermore you must declare some parameter (? placeholders) for your stored procedure,
otherwise how your your procedure know which values for pk_codehost and d_host to use ?!


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 Post subject: Re: Hibernate 4 and stored procedures for inserting records
PostPosted: Mon Feb 27, 2012 2:25 pm 
Newbie

Joined: Sat Feb 18, 2012 11:31 am
Posts: 5
hi expert, thanks for your reply, I know, whit that insert I am overwriting the default method for insert records.

But, I have another question, If I have a stored procedure (postgresql) that looks for a record description, If it isn't in the BBDD, then the function insert it and returns an integer with the id, something like:

Code:
CREATE OR REPLACE FUNCTION insert_host5(description character varying)
  RETURNS integer AS
$BODY$
BEGIN
   IF NOT EXISTS
                (SELECT h.pk_codehost from public.x_hosts h WHERE h.d_host=description) THEN
                               INSERT INTO public.x_hosts
                               (
                                               d_host
                               )
                               VALUES
                               (
                                               description
                               );
                               
                
                               
         END IF;
       RETURN CURRVAL('x_hosts_pk_codehost_seq');

END
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION insert_host5(character varying)
  OWNER TO postgres;

in my hbm.xml I have the next:

Code:
<sql-query name="callHostStoreProcedure">
      <return-scalar column="pk_codehost" type="integer"/>
      {? = call insert_host5(:description)}
      <!--{? = Select * from insert_host5(:description) as t1}-->
    </sql-query>

But when I execute it from java:

Code:
[b]Query query = session.getNamedQuery("callHostStoreProcedure2");
query.setString("description", sHost);
query.setResultTransformer(Transformers.aliasToBean(blom.log.model.xhost_sp.class));
List something = query.list();[/b]


I gives me an error:
org.hibernate.QueryException: Expected positional parameter count: 1, actual parameters: [] [{? = Select * from insert_host5(:description)}]

Any help please, for execute that function in hibernate

Thanks in advance


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