[IBATISNET-263] Support for circular reference

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: DataMapper 3.0
• Fix Version/s: DataMapper 3.0
• Component/s: DataMapper
• Assignee: Gilles Bayon
• Reporter: Gilles Bayon
• Due: 18/May/08
• Created: 18/May/08 06:26
• Updated: 18/May/08 06:46
• Resolved: 18/May/08 06:46

Description

To avoid creation of new Instance of the same object during an ibatis request, add the 'keys' attribute on resultMap tag to specify the properties identifiers

public class Order
{
public Account

{get;set}

...
}

<resultMap id="account-constructor-circular" keys="identifiant" class="Account" >
<constructor>
<argument argumentName="identifiant" column="Account_ID"/>
<argument argumentName="firstName" column="Account_FirstName"/>
<argument argumentName="lastName" column="Account_LastName"/>
</constructor>
</resultMap>

<resultMap id="order-result-circular" extends="base-order-result" class="Order">
<result property="Account" resultMapping="Account.account-constructor-circular"/>
</resultMap>

<select id="GetOrderWithAcccount" resultMap="order-result-circular" >
SELECT
*
FROM
Orders o
JOIN
Accounts a
ON
o.Account_Id = A.Account_Id
</select>

List<Order> list = (List<Order>)dataMapper.QueryForList<Order>("GetOrderWithAcccount", null);

Account account1 = list.Find(delegate(Order order)

{ return order.Id==1; }

).Account;
Account account2 = list.Find(delegate(Order order)

{ return order.Id == 10; }

).Account;

Assert.That(account1, Is.SameAs(account2));