springboot(七):springboot+mybatis

作者: 464a879f8351 | 来源:发表于2017-05-10 13:27 被阅读288次

    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。

    废话不多说直接上代码吧

    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:

    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

    @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

    @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

    public interface User1Mapper {
        
        List<UserEntity> getAll();
        
        UserEntity getOne(Long id);
    
        void insert(UserEntity user);
    
        void update(UserEntity user);
    
        void delete(Long id);
    
    }
    

    xml层

    <?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>
    

    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

    @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);
        }
        
    }
    

    最后源码地址在这里spring-boot-mybatis-mulidatasource


    作者:纯洁的微笑
    出处:http://www.ityouknow.com/
    版权所有,欢迎保留原文链接进行转载:)

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