create table student
(
student_id int auto_increment,
student_name varchar(20) not null,
primary key(student_id)
)

public class Student
{
private int studentId;
private String studentName;
public int getStudentId()
{
return studentId;
}
public void setStudentId(int studentId)
{
this.studentId = studentId;
}
public String getStudentName()
{
return studentName;
}
public void setStudentName(String studentName)
{
this.studentName = studentName;
}
public String toString()
{
return "Student{[studentId:" + studentId + "], [studentName:" + studentName + "]}";
}
} 

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<typeAliases>
<typeAlias alias="Student" type="org.xrq.domain.Student" />
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/test"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="student_mapper.xml"/>
</mappers>
</configuration> 

<mapper namespace="StudentMapper">
<resultMap type="Student" id="StudentMap">
<id column="student_id" property="studentId" jdbcType="INTEGER" />
<result column="student_name" property="studentName" jdbcType="VARCHAR" />
</resultMap>
<select id="selectAllStudents" resultMap="StudentMap">
select student_id, student_name from student;
</select>
<insert id="insertStudent" useGeneratedKeys="true" keyProperty="studentId" parameterType="Student">
insert into student(student_id, student_name) values(#{studentId, jdbcType=INTEGER}, #{studentName, jdbcType=VARCHAR});
</insert>
</mapper> 

public class MyBatisUtil
{
protected static SqlSessionFactory ssf;
protected static Reader reader;
static
{
try
{
reader = Resources.getResourceAsReader("config.xml");
ssf = new SqlSessionFactoryBuilder().build(reader);
} 
catch (IOException e)
{
e.printStackTrace();
}
}
protected SqlSession getSqlSession()
{
return ssf.openSession();
}
} 

public interface StudentDao
{
public List<Student> selectAllStudents();
public int insertStudent(Student student);
}

public class StudentDaoImpl extends MyBatisUtil implements StudentDao
{
private static final String NAMESPACE = "StudentMapper.";
public List<Student> selectAllStudents()
{
SqlSession ss = getSqlSession();
List<Student> list = ss.selectList(NAMESPACE + "selectAllStudents");
ss.close();
return list;
}
public int insertStudent(Student student)
{
SqlSession ss = getSqlSession();
int i = ss.insert(NAMESPACE + "insertStudent", student);
// ss.commit();
ss.close();
return i;
}
}

public class StudentTest
{
public static void main(String[] args)
{
StudentDao studentDao = new StudentDaoImpl();
Student student = new Student();
student.setStudentName("Jack");
studentDao.insertStudent(student);
System.out.println("插入的主键为：" + student.getStudentId());
System.out.println("-----Display students------");
List<Student> studentList = studentDao.selectAllStudents();
for (int i = 0, length = studentList.size(); i < length; i++)
System.out.println(studentList.get(i));
}
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<typeAliases>
<typeAlias alias="Student" type="org.xrq.domain.Student" />
</typeAliases>
</configuration> 

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd 
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.2.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd 
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd">
<!-- 注解配置 -->
<tx:annotation-driven transaction-manager="transactionManager" />
<context:annotation-config /> 
<context:component-scan base-package="org.xrq" />
<!-- 数据库连接池,这里使用alibaba的Druid -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
<property name="url" value="jdbc:mysql://localhost:3306/test" /> 
<property name="username" value="root" /> 
<property name="password" value="root" /> 
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:config.xml" />
<property name="mapperLocations" value="classpath:*_mapper.xml" />
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 事务管理器 --> 
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> 
<property name="dataSource" ref="dataSource" /> 
</bean> 
</beans> 

@Repository
public class StudentDaoImpl extends SqlSessionDaoSupport implements StudentDao
{
private static final String NAMESPACE = "StudentMapper.";
@Resource
public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory)
{
super.setSqlSessionFactory(sqlSessionFactory);
}
public List<Student> selectAllStudents()
{
return getSqlSession().selectList(NAMESPACE + "selectAllStudents");
}
public int insertStudent(Student student)
{
return getSqlSession().insert(NAMESPACE + "insertStudent", student);
}
} 

public class StudentTest
{
public static void main(String[] args)
{
ApplicationContext ac = new ClassPathXmlApplicationContext("spring.xml");
StudentDao studentDao = (StudentDao)ac.getBean("studentDaoImpl");
Student student = new Student();
student.setStudentName("Lucy");
int j = studentDao.insertStudent(student);
System.out.println("j = " + j + "\n");
System.out.println("-----Display students------");
List<Student> studentList = studentDao.selectAllStudents();
for (int i = 0, length = studentList.size(); i < length; i++)
System.out.println(studentList.get(i));
}
}