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
相关链接
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作者：纯洁的微笑 @张强 （转载已获得作者同意，如需转载请与原作者联系！）
出处：www.ityouknow.com
