public class Customer implements Serializable {

   private String name;  private int customerId;   private CustomerOrder customerOrder;

    public Customer() {     System.out.println("Creating CustomerBO...");   } /**    * @return Returns the customerId.    */   public int getCustomerId() {      return customerId;    } /**    * @param customerId The customerId to set.   */   public void setCustomerId(int customerId) {       this.customerId = customerId;    } /**    * @return Returns the name.  */   public String getName() {     return name;  } /**    * @param name The name to set.   */   public void setName(String name) {        this.name = name;    }

    /**     * @return Returns the customerOrder.     */    public CustomerOrder getCustomerOrder()    {        return customerOrder;    }    /**     * @param customerOrder The customerOrder to set.     */    public void setCustomerOrder(CustomerOrder customerOrder)    {        this.customerOrder = customerOrder;    }}

<sqlMap namespace="Customer">    <parameterMap id="updateCustomerOrderParamMap"      class="com.ibm.ibatis.sample.bo.CustomerOrder">     <parameter property="orderId" />     <parameter property="customerId" />  </parameterMap>

   <resultMap          class="com.ibm.persistence.ibatis.bo.Customer"         id="customerOrderMap">      <result property="customerId"          column="CUST_ID"           nullValue="0" />         <result property="customerOrder.orderId"            column="OPEN_ORDER_ID"             nullValue="0" />       <result property="customerOrder.customerId"           column="CUST_ID"       nullValue="0" />   </resultMap>   <statement id="checkCustomer"        parameterClass="java.lang.Integer" resultMap="customerOrderMap">       SELECT CUST_ID, OPEN_ORDER_ID FROM CUSTOMER_USER.CUSTOMER WHERE CUST_ID = #customerId# FOR UPDATE   </statement>    <statement id="getOrderId"       parameterClass="java.lang.Integer"         resultClass="java.lang.Integer">        SELECT ORDER_ID FROM CUSTOMER_USER.ORDER WHERE CUSTOMER_ID = #customerId# AND STATUS='OPEN'  </statement>    <statement id="insertOrder"      parameterClass="java.lang.Integer">         INSERT INTO CUSTOMER_USER.ORDER (STATUS, TOTAL, CUSTOMER_ID)VALUES('OPEN',0,#customerId#)  </statement>    <statement id="updateCustomerOrderId"        parameterMap="updateCustomerOrderParamMap">         UPDATE CUSTOMER_USER.CUSTOMER SET OPEN_ORDER_ID = ? WHERE CUST_ID = ?  </statement></sqlMap>

//Access SQL client MaopSqlMapClient sqlMapClient = OrderEntryConfig.getSqlMapInstance();

      //1.  Retrieve total using SUM() function in SQL      Integer total = (Integer)sqlMapClient.queryForObject("getOrderTotal",new Integer      (customerOrder.getOrderId()));      //2.  Set total in CustomerOrder Object      customerOrder.setTotal(total);      //3. Update Total column in DB      sqlMapClient.update("updateOrderTotal",customerOrder);