java iBatis加载对象列表
我是iBatis的新手(从今天开始),我正在尝试查询数据库中的对象列表(返回单个对象和值很好)
我遵循THIS教程(稍加修改-我的类有不同的名称)。你能告诉我在这种情况下我做错了什么吗
这是我获取用户列表的映射:
<!-- Retrieve all users -->
<select id="getAll" resultClass="wa.myslima.refman.entities.User">
SELECT * FROM USER
</select>
打电话的时候
rd = Resources.getResourceAsReader("SqlMapConfig.xml");
SqlMapClient smc = SqlMapClientBuilder.buildSqlMapClient(rd);
users = (List<User>) smc.queryForList("User.getAll", null);
我得到以下例外情况:
--- The error occurred in User.xml.
--- The error occurred while applying a result map.
--- Check the User.getAll-AutoResultMap.
--- The error occured while instantiating the result object
--- Cause: java.lang.RuntimeException: JavaBeansDataExchange could not instantiate result class. Cause: java.lang.InstantiationException: wa.myslima.refman.entities.User
在其他一些教程中,它们使用了一些额外的映射,因此我也尝试了这种方法,但没有成功:
<resultMap id="UserResult" class="wa.myslima.entities.User">
<result property="id" column="id"/>
<result property="name" column="name"/>
<result property="email" column="email"/>
</resultMap>
<select id="getAll" resultMap="UserResult">
select * from USER
</select>
谢谢你的提示。这可能是一些愚蠢的错误,比如打字错误,但我还是看不透
编辑:用户。爪哇
import java.io.Serializable;
public class User implements Serializable {
private static final long serialVersionUID = 1456239434165308496L;
private int id;
private String name;
private String password;
private String email;
public User(String name, String password, String email) {
this.name = name;
this.password = password;
this.email = email;
}
public int getId() {
return id;
}
public String getName() {
return name;
}
public String getPassword() {
return password;
}
public String getEmail() {
return email;
}
}
# 1 楼答案
在用户类中需要一个默认构造函数。因此,将其定义为:
Ibatis将使用此构造函数创建新用户