ibatis 2.3 调用Oracle Function 返回字符串实例

Map m = new HashMap();
m.put("v_instancename", instancename);
m.put("v_almobjtype", alarmobjtype);
m.put("v_almobj", alarmobjdn);
m.put("result", "");
service.update("Workorder.updateAlarmInfoInstance", m);

<parameterMap class="java.util.Map" id="f_map">
<parameter property="result" jdbcType="VARCHAR" javaType="java.lang.String" mode="OUT" />
<parameter property="v_instancename" jdbcType="VARCHAR" javaType="java.lang.String" mode="IN"/>
<parameter property="v_almobjtype" jdbcType="VARCHAR" javaType="java.lang.String" mode="IN"/>
<parameter property="v_almobj" jdbcType="VARCHAR" javaType="java.lang.String" mode="IN"/>
</parameterMap>
<procedure id="Workorder.updateAlarmInfoInstance" parameterMap="f_map">
<![CDATA[
{? = call F_createalarminfoinstancename(?,?,?)}
]]>
</procedure>

CREATE OR REPLACE Function F_createalarminfoinstancename(
v_instancename in varchar2 ,
v_almobjtype in varchar2,
v_almobj in varchar2
)
return  varchar2

is

v_err varchar2(200);
result varchar2(10);
Begin
result:='1';

update alm_alarminfo set instancename = v_instancename where alarmobjdn = v_almobj and alarmobjtype = v_almobjtype;
commit;
return result;

End F_createalarminfoinstancename;