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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.Driverspring.datasource.test1.url = jdbc:mysql://localhost:3306/test1?useUnicode=true&characterEncoding=utf-8spring.datasource.test1.username = rootspring.datasource.test1.password = root spring.datasource.test2.driverClassName = com.mysql.jdbc.Driverspring.datasource.test2.url = jdbc:mysql://localhost:3306/test2?useUnicode=true&characterEncoding=utf-8spring.datasource.test2.username = rootspring.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指定主库，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,首先创建DataSource，然后创建SqlSessionFactory再创建事务，最后包装到SqlSessionTemplate中。其中需要指定分库的mapper文件地址，以及分库dao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 @RestControllerpublic 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); } }
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