前面講述的內容中，基本都是按照同樣的步驟1）建立介面類，2）建立主配置檔案，3）建立介面對映檔案。在介面類中定義實現的介面功能，在對映配置檔案中寫具體的完成介面類容的sql語句，然後在主配置檔案中應用對映配置檔案操作相關的操作。mybatis也提供了一套通過介面操作資料請求的註解，比如要完成一個查詢操作，可以按照如下的步驟完成：

1.建立實體類

Employee

package org.mybatis.annotation;

public class Employee {
    private Integer id;
    private String lastName;
    private
 
 String email;
    private String gender;

    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    public
 
 String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    @Override
    public String toString
 
() {
        return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email
                + ", gender=" + gender + "]";
    }
}

2.建立方法介面類

EmployeeAnnotation
在介面方法上面新增@Select註解，在註解中新增實際的操作sql語句。還有其他的相關注解如@Insert等，更詳細的內容可參考MybatisApi

package org.mybatis.annotation;

import org.apache.ibatis.annotations.Select;

public interface EmployeeAnnotation {

    @Select("select * from mybatis_employee where id = #{id}")
    public Employee getEmployeeById(int id);

}

3.建立主配置檔案

mybatis-config-annotation.xml
在主配置檔案中引用介面類org.mybatis.annotation.EmployeeAnnotation

<?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>

    <properties resource="db.properties"></properties>

    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="${mysql.driver}" />
                <property name="url" value="${mysql.url}" />
                <property name="username" value="${mysql.username}" />
                <property name="password" value="${mysql.password}" />
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <!-- 通過註解的形式，不需要mapper配置檔案 。但是這樣存在硬編碼，所以需要優化的，經常變的不要寫在這裡-->
        <mapper class="org.mybatis.annotation.EmployeeAnnotation"/>

        <!-- 也可以直接通過包，不指定具體類 -->
        <!-- <package name="org.mybatis.annotation"/> -->
    </mappers>

</configuration>

4.建立測試類

package org.mybatis.annotation;

import java.io.IOException;
import java.io.InputStream;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

/**
 * 使用介面式程式設計
 */
public class MybatisTest {

    @Test
    public void testMybatis() {
        String resource = "mybatis-config-annotation.xml";

        InputStream inputStream = null;
        SqlSessionFactory sqlSessionFactory = null;
        SqlSession sqlSession = null;
        try {
            inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
            sqlSession = sqlSessionFactory.openSession();

            EmployeeAnnotation mapper = sqlSession.getMapper(EmployeeAnnotation.class);

            Employee employee = mapper.getEmployeeById(2);

            System.out.println(employee);

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            sqlSession.close();
        }
    }
}

5.測試結果

DEBUG - Openning JDBC Connection
DEBUG - Created connection 527446182.
DEBUG - ooo Using Connection [[email protected]]
DEBUG - ==> Preparing: select * from mybatis_employee where id = ?
DEBUG - ==> Parameters: 2(Integer)
Employee [id=2, lastName=lisi, [email protected], gender=2]
DEBUG - Resetting autocommit to true on JDBC Connection [[email protected]]
DEBUG - Closing JDBC Connection [[email protected]]
DEBUG - Returned connection 527446182 to pool.

這個步驟中省略了建立對映配置檔案的步驟，直接在主配置檔案中引用介面類。
但是這種方式也存在一定的問題，比如這樣操作是硬編碼，為以後的修改和除錯都埋下隱患。建議還是使用對映配置檔案的方式來操作。