手把手教你SpringBoot整合Mybatis

更新時(shí)間：2023年03月30日 16:19:57 作者：海風(fēng)極客

這篇文章主要介紹了手把手教你SpringBoot整合Mybatis,Mybatis是一款持久化框架,可以幫我們省去大部分jdbc的代碼,需要的朋友可以參考下

Mybatis的簡(jiǎn)單介紹

? MyBatis 本是apache的一個(gè)開(kāi)源項(xiàng)目iBatis, 2010年這個(gè)項(xiàng)目由apache software foundation 遷移到了google code，并且改名為MyBatis 。2013年11月遷移到Github。

? iBATIS一詞來(lái)源于“internet”和“abatis”的組合，是一個(gè)基于Java的持久層框架。iBATIS提供的持久層框架包括SQL Maps和Data Access Objects（DAOs）

? MyBatis 是一款優(yōu)秀的持久層框架，它支持定制化 SQL、存儲(chǔ)過(guò)程以及高級(jí)映射。MyBatis 避免了幾乎所有的 JDBC 代碼和手動(dòng)設(shè)置參數(shù)以及獲取結(jié)果集。MyBatis 可以使用簡(jiǎn)單的 XML 或注解來(lái)配置和映射原生信息，將接口和 Java 的 POJOs(Plain Ordinary Java Object,普通的 Java對(duì)象)映射成數(shù)據(jù)庫(kù)中的記錄。

? 思想：ORM:Object Relational Mapping

? Mybatis基本框架：

在這里插入圖片描述

1 環(huán)境搭建

新建Spring Boot項(xiàng)目，引入依賴(lài)

pom.xml

<!--mysql-->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.47</version>
</dependency>
<!--mybatis-->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.3.2</version>
</dependency>
<!--Druid數(shù)據(jù)源-->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.1.9</version>
</dependency>
<!--測(cè)試-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>

DB-sql

CREATE TABLE `student` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8;

項(xiàng)目結(jié)構(gòu)

在這里插入圖片描述

2 整合方式一：注解版

2.1 配置

server:
  port: 8081
spring:
  datasource: # 配置數(shù)據(jù)庫(kù)
    username: root
    password: 12345
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test   #數(shù)據(jù)庫(kù)名
    type: com.alibaba.druid.pool.DruidDataSource

2.2 編碼

/**
 * 注解版
 */
@Mapper
@Repository
public interface JavaStudentMapper {

    /**
     * 添加一個(gè)學(xué)生
     *
     * @param student
     * @return
     */
    @Insert("insert into student(name, age) " +
            "values (#{name}, #{age})")
    public int saveStudent(Student student);

    /**
     * 根據(jù)ID查看一名學(xué)生
     *
     * @param id
     * @return
     */
    @Select("select *  " +
            "from student " +
            "where id = #{id}")
    public Student findStudentById(Integer id);

    /**
     * 查詢(xún)?nèi)繉W(xué)生
     *
     * @return
     */
    @Select("select * " +
            "from student")
    @Results({
            @Result(property = "id", column = "id"),
            @Result(property = "name", column = "name"),
            @Result(property = "age", column = "age")
    })
    public List<Student> findAllStudent();

    /**
     * 根據(jù)ID刪除一個(gè)
     *
     * @param id
     * @return
     */
    @Delete("delete   " +
            "from student " +
            "where id = #{id}")
    public int removeStudentById(Integer id);

    /**
     * 根據(jù)ID修改
     *
     * @param student
     * @return
     */
    @Update("update set name=#{name},age=#{age}  " +
            "where id=#{id}")
    public int updateStudentById(Student student);

}

2.3 測(cè)試

@Autowired
private JavaStudentMapper studentMapper;

@Test
void testJavaMapperInsert() {
    Student student = new Student("張三", 22);
    System.out.println(studentMapper.saveStudent(student));
}

@Test
void testJavaMapperFind() {
    System.out.println(studentMapper.findStudentById(2));
}

@Test
void testJavaMapperFindAll() {
    System.out.println(studentMapper.findAllStudent());
}

@Test
void testJavaMapperUpdate() {
    Student student = new Student(2, "張三", 22);
    System.out.println(studentMapper.updateStudentById(student));
}

@Test
void testJavaMapperDelete() {
    System.out.println(studentMapper.removeStudentById(2));
}

3 整合方式二：XML版

3.1 配置

server:
  port: 8081
spring:
  application:
    name: hospitalManager       #項(xiàng)目名
  datasource: # 配置數(shù)據(jù)庫(kù)
    username: root
    password: 12345
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test   #數(shù)據(jù)庫(kù)名
    type: com.alibaba.druid.pool.DruidDataSource
mybatis:
  mapper-locations: classpath:mapper/*Mapper.xml #掃描resources下的mapper文件夾下的xml文件
  type-aliases-package: org.ymx.sp_mybatis.pojo #實(shí)體類(lèi)所在包，定義別名

主啟動(dòng)類(lèi)：

@SpringBootApplication
@MapperScan("org.ymx.sp_mybatis.xmlMapper") //掃描的mapper
public class SpMybatisApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpMybatisApplication.class, args);
    }

}

3.2 編碼

/**
 * xml版
 */
@Mapper
@Repository
public interface XmlStudentMapper {
    /**
     * 添加一個(gè)學(xué)生
     *
     * @param student
     * @return
     */
    public int saveStudent(Student student);

    /**
     * 根據(jù)ID查看一名學(xué)生
     *
     * @param id
     * @return
     */
    public Student findStudentById(Integer id);

    /**
     * 查詢(xún)?nèi)繉W(xué)生
     *
     * @return
     */
    public List<Student> findAllStudent();

    /**
     * 根據(jù)ID刪除一個(gè)
     *
     * @param id
     * @return
     */
    public int removeStudentById(Integer id);

    /**
     * 根據(jù)ID修改
     *
     * @param student
     * @return
     */
    public int updateStudentById(Student student);

}

xml文件（StudentMapper.xml）

<?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="org.ymx.sp_mybatis.dao.xmlMapper.XmlStudentMapper">
    <!-- 添加學(xué)生-->
    <insert id="saveStudent" parameterType="org.ymx.sp_mybatis.pojo.Student" useGeneratedKeys="true"
            keyProperty="id">
        insert into student(name, age)
        values (#{name}, #{age})
    </insert>
    <!--查看學(xué)生根據(jù)ID-->
    <select id="findStudentById" parameterType="integer"              resultType="org.ymx.sp_mybatis.pojo.Student">
        select *
        from student
        where id = #{id}
    </select>
    <!--查看全部學(xué)生-->
    <select id="findAllStudent" resultMap="studentResult">
        select *
        from student
    </select>
    <!--刪除學(xué)生根據(jù)ID-->
    <delete id="removeStudentById" parameterType="integer">
        delete
        from student
        where id = #{id}
    </delete>
    <!--修改學(xué)生根據(jù)ID-->
    <update id="updateStudentById" parameterType="org.ymx.sp_mybatis.pojo.Student">
        update student
        set name=#{name},
            age=#{age}
        where id = #{id}
    </update>
    <!--查詢(xún)結(jié)果集-->
    <resultMap id="studentResult" type="org.ymx.sp_mybatis.pojo.Student">
        <result column="id" javaType="INTEGER" jdbcType="INTEGER" property="id"/>
        <result column="name" javaType="STRING" jdbcType="VARCHAR" property="name"/>
        <result column="age" javaType="INTEGER" jdbcType="INTEGER" property="age"/>
    </resultMap>
</mapper>

3.3 測(cè)試

@Autowired
private XmlStudentMapper studentMapper;

@Test
void testJavaMapperInsert() {
    Student student = new Student("張三", 22);
    System.out.println(studentMapper.saveStudent(student));
}

@Test
void testJavaMapperFind() {
    System.out.println(studentMapper.findStudentById(2));
}

@Test
void testJavaMapperFindAll() {
    System.out.println(studentMapper.findAllStudent());
}

@Test
void testJavaMapperUpdate() {
    Student student = new Student(2, "張三", 22);
    System.out.println(studentMapper.updateStudentById(student));
}

@Test
void testJavaMapperDelete() {
    System.out.println(studentMapper.removeStudentById(2));
}