学步园

<!DOCTYPE hibernate-mapping

    PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

    <class name="onlyfun.caterpillar.User" table="user">

        <composite-id>

            <key-property name="name"

                          column="name"

                          type="java.lang.String"/>

            <key-property name="sex"

                          column="sex"

                          type="java.lang.String"/>

        </composite-id>

    </class>

</hibernate-mapping>

并且定义的User类要覆盖equals和hashCode方法

Java code

public boolean equals(Object obj) {
        if(obj == this) {
            return true;
        }
        if(!(obj instanceof User)) {
            return false;
        }
        User user = (User) obj;
        return new EqualsBuilder()
                 .append(this.name, user.getName())
                 .append(this.sex, user.getSex())
                 .isEquals();
    }
    public int hashCode() {
        return new HashCodeBuilder()
                 .append(this.name)
                 .append(this.sex)
                 .toHashCode();
    }