how to write queries in parent -child relationships using hibernate

Below is the mapping files for parnet and child tables;


Parent
*****

ID NAME
1  STEVEN
2  JOHNSON


Child
*****
ID FIRSTNAME      LASTNAME                                 PID
1  XXX                             AAA                                   1
2  YYYY                          LLL                         1
3  GGGG             JJJJ            2
4  JJJJ             BJB                                  1
5  HGHH             JUIU                          2

i have 2 qustions in this..

1.Using hibernate how to retrieve child records by passing corresponding parentid(pid);i want to know how to use hibernate in a good way?

2.how to write below queries in Hibernate??
select *  from parent p,child c where p.id=c.pid and c.pid=1



Parent.hbm.xml
**********
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
    <class name="com.dao.Parent" table="PARENT" schema="SCOTT">
        <id name="pid" type="java.lang.Long">
            <column name="PID" precision="6" scale="0" />
            <generator class="increment" />
        </id>
        <property name="pname" type="java.lang.String">
            <column name="PNAME" length="50" />
        </property>
        <set name="childs" inverse="true">
            <key>
                <column name="PID" precision="6" scale="0" />
            </key>
            <one-to-many class="com.dao.Child" />
        </set>
    </class>
</hibernate-mapping>

Child.hbm.xml
************
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
    <class name="com.dao.Child" table="CHILD" schema="SCOTT">
        <id name="cid" type="java.lang.Long">
            <column name="CID" precision="6" scale="0" />
            <generator class="increment" />
        </id>
        <many-to-one name="parent" class="com.dao.Parent" fetch="select">
            <column name="PID" precision="6" scale="0" />
        </many-to-one>
        <property name="firstname" type="java.lang.String">
            <column name="FIRSTNAME" length="12" />
        </property>
        <property name="lastname" type="java.lang.String">
            <column name="LASTNAME" length="12" />
        </property>
    </class>
</hibernate-mapping>