SpringBoot ( 七 ) ：springboot + mybatis 多数据源最简解决方案

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原文出处：纯洁的微笑

说起多数据源，一般都来解决那些问题呢，主从模式或者业务比较复杂需要连接不同的分库来支持业务。我们项目是后者的模式，网上找了很多，大都是根据jpa来做多数据源解决方案，要不就是老的spring多数据源解决方案，还有的是利用aop动态切换，感觉有点小复杂，其实我只是想找一个简单的多数据支持而已，折腾了两个小时整理出来，供大家参考。

配置文件

pom包就不贴了比较简单该依赖的就依赖，主要是数据库这边的配置：

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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

一个test1库和一个test2库，其中test1位主库，在使用的过程中必须制定主库，不然会报错。

数据源配置

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@Configuration
@MapperScan(basePackages = "com.neo.mapper.test1", sqlSessionTemplateRef  = "test1SqlSessionTemplate")
publicclass DataSource1Config {
 
    @Bean(name = "test1DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.test1")
    @Primary
    publicDataSource testDataSource() {
        returnDataSourceBuilder.create().build();
    }
 
    @Bean(name = "test1SqlSessionFactory")
    @Primary
    publicSqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource) throwsException {
        SqlSessionFactoryBean bean = newSqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(newPathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test1/*.xml"));
        returnbean.getObject();
    }
 
    @Bean(name = "test1TransactionManager")
    @Primary
    publicDataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {
        returnnew DataSourceTransactionManager(dataSource);
    }
 
    @Bean(name = "test1SqlSessionTemplate")
    @Primary
    publicSqlSessionTemplate testSqlSessionTemplate(@Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throwsException {
        returnnew SqlSessionTemplate(sqlSessionFactory);
    }
 
}

最关键的地方就是这块了，一层一层注入,先创建DataSource，在创建SqlSessionFactory在创建事务，最后包装到SqlSessionTemplate中。其中需要制定分库的mapper文件地址，以及分库到层代码

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

这块的注解就是指明了扫描dao层，并且给dao层注入指定的SqlSessionTemplate。所有@Bean都需要按照命名指定正确。

dao层和xml层

dao层和xml需要按照库来分在不同的目录，比如：test1库dao层在com.neo.mapper.test1包下，test2库在com.neo.mapper.test1

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publicinterface User1Mapper {
     
    List<UserEntity> getAll();
     
    UserEntity getOne(Long id);
 
    voidinsert(UserEntity user);
 
    voidupdate(UserEntity user);
 
    voiddelete(Long id);
 
}

xml层

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

测试

测试可以使用SpringBootTest,也可以放到Controller中，这里只贴Controller层的使用

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@RestController
publicclass UserController {
 
    @Autowired
    privateUser1Mapper user1Mapper;
 
    @Autowired
    privateUser2Mapper user2Mapper;
     
    @RequestMapping("/getUsers")
    publicList<UserEntity> getUsers() {
        List<UserEntity> users=user1Mapper.getAll();
        returnusers;
    }
     
    @RequestMapping("/getUser")
    publicUserEntity getUser(Long id) {
        UserEntity user=user2Mapper.getOne(id);
        returnuser;
    }
     
    @RequestMapping("/add")
    publicvoid save(UserEntity user) {
        user2Mapper.insert(user);
    }
     
    @RequestMapping(value="update")
    publicvoid update(UserEntity user) {
        user2Mapper.update(user);
    }
     
    @RequestMapping(value="/delete/{id}")
    publicvoid delete(@PathVariable("id") Long id) {
        user1Mapper.delete(id);
    }
     
}

示例代码

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