Question

例如，我们有一个Person对象：

private int id;
private String firstName;
private String lastName;
private String sex;
private int age;
private Address address;

//加上setter和getter

这是我的结果集

public class PersonResultSet implements ResultSetExtractor<Person>{

@Override
public Person extractData(ResultSet rs) throws SQLException, DataAccessException {
    Person person = new Person();
    person.setId(rs.getInt("id"));
    person.setFirstName(rs.getString("firstName"));
    person.setLastName(rs.getString("lastName"));
    person.setSex(rs.getString("sex"));
    person.setAge(rs.getInt("age"));
    // How do i get the address from the table with the ID

    return person;
}

}

我如何从人员表中的地址ID对应的地址表中获取该人的地址？

Answer 1

您必须在查询中加入

select p.*, a.*
from person p inner join address a on (p.address_id = a.id)
where ...;

并且在您的extractData方法中，您将能够访问地址'colums

    @Override
public Person extractData(ResultSet rs) throws SQLException, DataAccessException {
    Person person = new Person();
    person.setId(rs.getInt("id"));
    person.setFirstName(rs.getString("firstName"));
    person.setLastName(rs.getString("lastName"));
    person.setSex(rs.getString("sex"));
    person.setAge(rs.getInt("age"));

    Address address = new Address();
    // Make sets as your are doing with person.
    person.setAddress(address);

    return person;
}

Spring JDBC ResultSet Extractor获取对象

1 个答案: