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    springboot+mybatis多數據源最簡解決方案

    時間:2025-02-11 21:14:06 java語言 我要投稿
    • 相關推薦

    springboot+mybatis多數據源最簡解決方案

      說起多數據源,一般都來解決那些問題呢,主從模式或者業務比較復雜需要連接不同的分庫來支持業務。本文是百分網小編搜索整理的關于springboot+mybatis多數據源最簡解決方案,供參考學習,希望對大家有所幫助!想了解更多相關信息請持續關注我們應屆畢業生考試網!

    springboot+mybatis多數據源最簡解決方案

      配置文件

      pom包就不貼了比較簡單該依賴的就依賴,主要是數據庫這邊的配置:

      mybatis.config-locations=classpath:mybatis/mybatis-config.xml

      spring.datasource.test1.driverClassName = com.mysql.jdbc.Driver

      spring.datasource.test1.url = jdbc:mysql://localhost:3306/test1?useUnicode=true&characterEncoding=utf-8

      spring.datasource.test1.username = root

      spring.datasource.test1.password = root

      spring.datasource.test2.driverClassName = com.mysql.jdbc.Driver

      spring.datasource.test2.url = jdbc:mysql://localhost:3306/test2?useUnicode=true&characterEncoding=utf-8

      spring.datasource.test2.username = root

      spring.datasource.test2.password = root

      一個test1庫和一個test2庫,其中test1位主庫,在使用的過程中必須制定主庫,不然會報錯。

      數據源配置

      @Configuration

      @MapperScan(basePackages = "com.neo.mapper.test1", sqlSessionTemplateRef = "test1SqlSessionTemplate")

      public class DataSource1Config {

      @Bean(name = "test1DataSource")

      @ConfigurationProperties(prefix = "spring.datasource.test1")

      @Primary

      public DataSource testDataSource() {

      return DataSourceBuilder.create().build();

      }

      @Bean(name = "test1SqlSessionFactory")

      @Primary

      public SqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource) throws Exception {

      SqlSessionFactoryBean bean = new SqlSessionFactoryBean();

      bean.setDataSource(dataSource);

      bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test1/*.xml"));

      return bean.getObject();

      }

      @Bean(name = "test1TransactionManager")

      @Primary

      public DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {

      return new DataSourceTransactionManager(dataSource);

      }

      @Bean(name = "test1SqlSessionTemplate")

      @Primary

      public SqlSessionTemplate testSqlSessionTemplate(@Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {

      return new SqlSessionTemplate(sqlSessionFactory);

      }

      }

      最關鍵的地方就是這塊了,一層一層注入,先創建DataSource,在創建SqlSessionFactory在創建事務,最后包裝到SqlSessionTemplate中。其中需要制定分庫的mapper文件地址,以及分庫到層代碼

      復制代碼 代碼如下:

      @MapperScan(basePackages = "com.neo.mapper.test1", sqlSessionTemplateRef  = "test1SqlSessionTemplate")

      這塊的注解就是指明了掃描dao層,并且給dao層注入指定的SqlSessionTemplate。所有@Bean都需要按照命名指定正確。

      dao層和xml層

      dao層和xml需要按照庫來分在不同的目錄,比如:test1庫dao層在com.neo.mapper.test1包下,test2庫在com.neo.mapper.test1

      public interface User1Mapper {

      List<UserEntity> getAll();

      UserEntity getOne(Long id);

      void insert(UserEntity user);

      void update(UserEntity user);

      void delete(Long id);

      }

      xml層

      <?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.neo.mapper.test1.User1Mapper" >

      <resultMap id="BaseResultMap" type="com.neo.entity.UserEntity" >

      <id column="id" property="id" jdbcType="BIGINT" />

      <result column="userName" property="userName" jdbcType="VARCHAR" />

      <result column="passWord" property="passWord" jdbcType="VARCHAR" />

      <result column="user_sex" property="userSex" javaType="com.neo.enums.UserSexEnum"/>

      <result column="nick_name" property="nickName" jdbcType="VARCHAR" />

      </resultMap>

      <sql id="Base_Column_List" >

      id, userName, passWord, user_sex, nick_name

      </sql>

      <select id="getAll" resultMap="BaseResultMap" >

      SELECT

      <include refid="Base_Column_List" />

      FROM users

      </select>

      <select id="getOne" parameterType="java.lang.Long" resultMap="BaseResultMap" >

      SELECT

      <include refid="Base_Column_List" />

      FROM users

      WHERE id = #{id}

      </select>

      <insert id="insert" parameterType="com.neo.entity.UserEntity" >

      INSERT INTO

      users

      (userName,passWord,user_sex)

      VALUES

      (#{userName}, #{passWord}, #{userSex})

      </insert>

      <update id="update" parameterType="com.neo.entity.UserEntity" >

      UPDATE

      users

      SET

      <if test="userName != null">userName = #{userName},</if>

      <if test="passWord != null">passWord = #{passWord},</if>

      nick_name = #{nickName}

      WHERE

      id = #{id}

      </update>

      <delete id="delete" parameterType="java.lang.Long" >

      DELETE FROM

      users

      WHERE

      id =#{id}

      </delete>

      </mapper>

      測試

      測試可以使用SpringBootTest,也可以放到Controller中,這里只貼Controller層的使用

      @RestController

      public class UserController {

      @Autowired

      private User1Mapper user1Mapper;

      @Autowired

      private User2Mapper user2Mapper;

      @RequestMapping("/getUsers")

      public List<UserEntity> getUsers() {

      List<UserEntity> users=user1Mapper.getAll();

      return users;

      }

      @RequestMapping("/getUser")

      public UserEntity getUser(Long id) {

      UserEntity user=user2Mapper.getOne(id);

      return user;

      }

      @RequestMapping("/add")

      public void save(UserEntity user) {

      user2Mapper.insert(user);

      }

      @RequestMapping(value="update")

      public void update(UserEntity user) {

      user2Mapper.update(user);

      }

      @RequestMapping(value="/delete/{id}")

      public void delete(@PathVariable("id") Long id) {

      user1Mapper.delete(id);

      }

      }

      最后源碼地址在這里spring-boot-mybatis-mulidatasource

      Java中的裝箱和拆箱深入理解

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