MyBatis详细讲解DAO代理的使用

SqlSession session = factory.openSession();
StudentDao dao = session.getMapper(StudentDao.class);

StudentDao studentDao = 
MyBatisUtil.getSqlSession().getMapper(StudentDao.class);

@Test
public void testSelect() throws IOException {
 final List<Student> studentList = studentDao.selectStudents();
 studentList.forEach( stu -> System.out.println(stu));
}

@Test
public void testInsert() throws IOException {
 Student student = new Student();
 student.setId(1006);
 student.setName("林浩");
 student.setEmail("linhao@163.com");
 student.setAge(26);
 int nums = studentDao.insertStudent(student);
 System.out.println("使用 Dao 添加数据:"+nums);
}

<delete id="deleteStudent" parameterType="int">
 delete from student where id=#{studentId}
</delete>
等同于
<delete id="deleteStudent" parameterType="java.lang.Integer">
 delete from student where id=#{studentId}
</delete>

Student selectById(int id);

<select id="selectById" resultType="com.bjpowernode.domain.Student">
 select id,name,email,age from student where id=#{studentId}
</select>

@Test
public void testSelectById(){
 //一个参数 
 Student student = studentDao.selectById(1005);
 System.out.println("查询 id 是 1005 的学生："+student);
}

List<Student> selectMultiParam(@Param("personName") String name,
 @Param("personAge") int age);

<select id="selectMultiParam" resultType="com.bjpowernode.domain.Student">
 select id,name,email,age from student where name=#{personName} or age 
=#{personAge}
</select>

@Test
public void testSelectMultiParam(){
 List<Student> stuList = studentDao.selectMultiParam("李力",20);
 stuList.forEach( stu -> System.out.println(stu));
}

package com.bjpowernode.vo; 
public class QueryParam {
 private String queryName;
 private int queryAge;
 //set ，get 方法
}

List<Student> selectMultiObject(QueryParam queryParam);

<select id="selectMultiObject" resultType="com.bjpowernode.domain.Student">
 select id,name,email,age from student where name=#{queryName} or age 
=#{queryAge}
</select>
或
<select id="selectMultiObject" resultType="com.bjpowernode.domain.Student">
 select id,name,email,age from student
 where name=#{queryName,javaType=string,jdbcType=VARCHAR}
 or age =#{queryAge,javaType=int,jdbcType=INTEGER}
</select>

@Test
public void selectMultiObject(){
 QueryParam qp = new QueryParam();
 qp.setQueryName("李力");
 qp.setQueryAge(20);
 List<Student> stuList = studentDao.selectMultiObject(qp);
 stuList.forEach( stu -> System.out.println(stu));
}