Oracle存储过程，SYS_REFCURSOR和NHibernate

Question

I have a legacy Oracle (10.2g) database that I'm connecting to and I'd like to use NHibernate (2.0.1) to give me back objects from a stored procedure. The stored procedure in question uses a SYS_REFCURSOR to return results. According to the documentation this should be doable but I've found a few posts on the internet that suggest otherwise.

Here's my paraphrased code:

Mapping file:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" 
assembly="OracleStoredProcedures" namespace="OracleStoredProcedures">
    <class name="Person" mutable="false">
        <id name="PersonCode" type="AnsiString" column="PERSONCODE">
            <generator class="assigned" />
        </id>
        <property name="Name" type="String" column="PERSON_NAME" />
        <property name="Surname" type="String" column="PERSON_SURNAME" />
    </class>

    <sql-query name="getpeople">
        <return class="Person" />

        EXEC RS_DB.GETPERSONTEST 

    </sql-query>
</hibernate-mapping>

Stored procedure:

CREATE OR REPLACE PROCEDURE RS_DB.GETPERSONTEST (
   io_cursor   IN OUT   sys_refcursor
)
IS
BEGIN
   OPEN io_cursor FOR
      SELECT PERSONCODE, PERSON_NAME, PERSON_SURNAME
      FROM PEOPLE

END GETPERSONTEST;

Answer 1

What a royal pain this was. This finally worked. I turned the store procedure into a function. Function returned sys_refcursor. Used similar mapping as the OP and name query as below.

<sql-query name="getpeople">
 <return class="Person" />

 { ? = call RS_DB.GETPERSONTEST }
</sql-query>

Link

Answer 2

In your hibernate you state a return type, but Oracle procedures don't return anything. Perhaps if you changed it to a function which returned the ref cursor it would work properly. Also, I believe CALL is the proper syntax. EXEC is a SQL*Plus command and not really a SQL statement.

Answer 3

As far as I remember this was a bug I also found a couple of years ago when working with oracle, I've tracked back the issue in NH tracker and is fixed but on version 2.1.1GA; Can you verify that this is the same problem you have? https://nhibernate.jira.com/browse/NH-847

Answer 4

I came across this same problem today. For us, the fix was to use "CALL" rather than "EXEC", add the round brackets "()" to the procedure call, and wrap the call in curly braces "{}":

<sql-query name="getpeople">
    <return class="Person" />

    { CALL RS_DB.GETPERSONTEST() }

</sql-query>

Answer 5

According to this page you should use CALL instead of EXEC. I have not tried this, so YMMV.