MyBatis is a first class persistence framework with support for custom SQL, stored procedures
and advanced mappings. MyBatis eliminates almost all of the JDBC code and manual setting of
parameters and retrieval of results. MyBatis can use simple XML or Annotations for configuration
and map primitives, Map interfaces and Java POJOs (Plain Old Java Objects) to database records.

create table student
(studentId          int                        primary key     auto_increment    not null,studentName        varchar(20)                                                  not null,studentAge         int                                                          not null,studentPhone       varchar(20)                                                  not null
)charset=utf8insert into student values(null, 'Jack', 20, '000000');
insert into student values(null, 'Mark', 21, '111111');
insert into student values(null, 'Lily', 22, '222222');
insert into student values(null, 'Lucy', 23, '333333');
commit;

public class Student
{private int        studentId;private String     studentName;private int        studentAge;private String    studentPhone;public Student(){super();}public Student(int studentId, String studentName, int studentAge,String studentPhone){this.studentId = studentId;this.studentName = studentName;this.studentAge = studentAge;this.studentPhone = studentPhone;}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 int getStudentAge(){return studentAge;}public void setStudentAge(int studentAge){this.studentAge = studentAge;}public String getStudentPhone(){return studentPhone;}public void setStudentPhone(String studentPhone){this.studentPhone = studentPhone;}public String toString(){return "StudentId:" + studentId + "\tStudentName:" + studentName + "\tStudentAge:" + studentAge + "\tStudentPhone:" + studentAge;}
}

<?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="com.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.xml"/></mappers>
</configuration>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.xrq.StudentMapper"><select id="selectStudentById" parameterType="int" resultType="Student"><![CDATA[select * from student where studentId = #{id}]]></select>
</mapper>

public class BaseOperator
{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();}}
}

public class StudentOperator extends BaseOperator
{private static StudentOperator instance = new StudentOperator();private StudentOperator(){}public static StudentOperator getInstance(){return instance;}public Student selectStudentById(int studentId){SqlSession ss = ssf.openSession();Student student = null;try{student = ss.selectOne("com.xrq.StudentMapper.selectStudentById", 1);}finally{ss.close();}return student;}
}

public class MyBatisTest
{public static void main(String[] args){System.out.println(StudentOperator.getInstance().selectStudentById(1));}
}

StudentId:1    StudentName:Jack    StudentAge:20    StudentPhone:20