ibatis基础（二）：查询所有的对象

假设数据库的student表中有如下的字段和数据：



对应的Student.java如下:

public class Student {
private Integer id;
private String name;
private float score;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public float getScore() {
return score;
}
public void setScore(float score) {
this.score = score;
}
@Override
public String toString() {
return this.id+"\t"+this.name+"\t"+this.score;
}
}

此时我们要查询所有的对象需在Student.xml中添加如下代码：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"
"http://ibatis.apache.org/dtd/sql-map-2.dtd">

<sqlMap>
<!--typeAlias用于简写  -->
<typeAlias alias="Student" type="com.jim.bean.Student"/>
<!-- id代表索引名称   resultClass代表返回类型-->
<select id="SelectAllStudent" resultClass="Student">
select *
from student
</select>
</sqlMap>

编写junit进行测试：

@Test
public void queryAllStudent() throws Exception{
Reader reader=Resources.getResourceAsReader("SqlMapConfig.xml");//读取总配置文件
SqlMapClient sqlmapclient=SqlMapClientBuilder.buildSqlMapClient(reader);//创建SqlMapClient来操作数据库
reader.close();
List<Student> students=sqlmapclient.queryForList("SelectAllStudent");//调用我们写在xml中的sql语句
for(Student student:students){
System.out.println(student);
}
}

查看结果，成功查询出所以学生的信息：