說起多數據源，一般都來解決那些問題呢，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。我們項目是后者的模式，網上找了很多，大都是根據jpa來做多數據源解決方案，要不就是老的spring多數據源解決方案，還有的是利用aop動態切換，感覺有點小復雜，其實我只是想找一個簡單的多數據支持而已，折騰了兩個小時整理出來，供大家參考。
廢話不多說直接上代碼吧
配置文件
pom包就不貼了比較簡單該依賴的就依賴，主要是數據庫這邊的配置：
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mybatis.config-locations=classpath:mybatis/mybatis-config.xmlspring.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 = rootspring.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 |
一個test1庫和一個test2庫，其中test1位主庫，在使用的過程中必須制定主庫，不然會報錯。
數據源配置
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@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); }} |
最關鍵的地方就是這塊了，一層一層注入,先創建DataSource，在創建SqlSessionFactory在創建事務，最后包裝到SqlSessionTemplate中。其中需要制定分庫的mapper文件地址，以及分庫到層代碼
復制代碼 代碼如下:
@MapperScan(basePackages = "com.neo.mapper.test1", sqlSessionTemplateRef = "test1SqlSessionTemplate")
這塊的注解就是指明了掃描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.test1
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public interface User1Mapper { List<UserEntity> getAll(); UserEntity getOne(Long id); void insert(UserEntity user); void update(UserEntity user); void delete(Long id);} |
xml層
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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 <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> |
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
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@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); }} |
最后源碼地址在這里spring-boot-mybatis-mulidatasource
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：http://blog.csdn.net/ityouknow/article/details/70153631
