多數據源一般解決哪些問題？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。

直接上代碼。

配置文件

pom包依賴，該依賴的依賴。主要是數據庫這邊的配置：

mybatis.config-locations=classpath:mybatis/mybatis-config.xmlspring.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 = rootspring.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和一個test2庫，其中test1為主庫，必須指定主庫，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")@Primarypublic DataSource testDataSource() {return DataSourceBuilder.create().build();}@Bean(name = "test1SqlSessionFactory")@Primarypublic 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")@Primarypublic DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {return new DataSourceTransactionManager(dataSource);}@Bean(name = "test1SqlSessionTemplate")@Primarypublic SqlSessionTemplate testSqlSessionTemplate(@Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {return new SqlSessionTemplate(sqlSessionFactory);}}

最關鍵的地方就是這一塊了，一層一層注入，首先創建DataSource，然后創建SqlSessionFactory再創建事務，最后包裝到SQLSessionTemplate中。其中需要指定分庫的mapper文件地址。

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

這塊的注解就是指明了掃描的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需要按照庫來區分在不同的目錄，比如：test1庫dao層在com.neo.mapper.test1包下，test2庫在com.neo.mapper.test2下

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" > <!--命名空間--><resultMap id="BaseResultMap" type="com.neo.entity.UserEntity" > <!--結果集--> <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 usersWHERE 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 FROMusers 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 {@Autowiredprivate User1Mapper user1Mapper;@Autowiredprivate 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);} }

項目地址(碼云)

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