When updating an employee with id = 1 for example, what is the best way to delete all
previous records in the table certificate for this employee_id and insert the new ones?.
create table EMPLOYEE (
id INT NOT NULL auto_increment,
first_name VARCHAR(20) default NULL,
last_name VARCHAR(20) default NULL,
salary INT default NULL,
PRIMARY KEY (id)
);
create table CERTIFICATE (
id INT NOT NULL auto_increment,
certificate_name VARCHAR(30) default NULL,
employee_id INT default NULL,
PRIMARY KEY (id)
);
Hibernate mapping
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="Employee" table="EMPLOYEE">
<id name="id" type="int" column="id">
<generator class="sequence">
<param name="sequence">employee_seq</param>
</generator>
</id>
<set name="certificates" lazy="false" cascade="all">
<key column="employee_id" not-null="true"/>
<one-to-many class="Certificate"/>
</set>
<property name="firstName" column="first_name"/>
<property name="lastName" column="last_name"/>
<property name="salary" column="salary"/>
</class>
<class name="Certificate" table="CERTIFICATE">
<id name="id" type="int" column="id">
<param name="sequence">certificate_seq</param>
</id>
<property name="employee_id" column="employee_id" insert="false" update="false"/>
<property name="name" column="certificate_name"/>
</class>
</hibernate-mapping>
