CREATE TABLE CUSTOMER_MASTER (CUST_ID INT NOT NULL AUTO_INCREMENT PRIMARY KEY,CUST_FIRST_NAME VARCHAR(20) NOT NULL , CUST_LAST_NAME VARCHAR(20) NOT NULL);

CREATE TABLE CUSTOMER_DETAILS (CUST_DETAIL_ID INT NOT NULL AUTO_INCREMENT PRIMARY KEY,CUST_ID INT NOT NULL,CUST_ADDRESS VARCHAR(100) NOT NULL,CUST_PHONE VARCHAR(20) NULL, CUST_ZIP INT NULL, CUST_AGE INT NOT NULL,FOREIGN KEY(CUST_ID) REFERENCES CUSTOMER_MASTER(CUST_ID) ON DELETE CASCADE);

   <class name="MedCustomer" table="CUSTOMER_MASTER">
      <id name="custID" column="CUST_ID" unsaved-value="0">
         <generator class="increment" />
      </id>
      <property name="custFirstName" column="CUST_FIRST_NAME" />
      <property name="custLastName" column="CUST_LAST_NAME" />
      <one-to-one name="custDetail" class="CustomerDetail" cascade="all" ></one-to-one>
   </class>
   <class name="CustomerDetail" table="CUSTOMER_DETAILS">
      <id name="custDetailID" column="CUST_DETAIL_ID">
         <generator class="increment"></generator>
      </id>
      <property name="custID" column="CUST_ID" />
      <property name="custAddress" column="CUST_ADDRESS" />
      <property name="custPhone" column="CUST_PHONE" />
      <property name="custZip" column="CUST_ZIP" />
      <property name="age" column="CUST_AGE" />
   </class>

public int getCustID() {
   return customer.getCustID();
}
public void setCustID(int custID) {
   this.custID = customer.getCustID();
}