為什么80%的碼農(nóng)都做不了架構(gòu)師？>>> ??

說起多數(shù)據(jù)源，一般都來解決那些問題呢，主從模式或者業(yè)務比較復雜需要連接不同的分庫來支持業(yè)務。我們項目是后者的模式，網(wǎng)上找了很多，大都是根據(jù)jpa來做多數(shù)據(jù)源解決方案，要不就是老的spring多數(shù)據(jù)源解決方案，還有的是利用aop動態(tài)切換，感覺有點小復雜，其實我只是想找一個簡單的多數(shù)據(jù)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(shù)據(jù)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(shù)據(jù)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(guān)鍵的地方就是這塊了，一層一層注入,先創(chuàng)建DataSource，在創(chuàng)建SqlSessionFactory在創(chuàng)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

@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

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" ><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 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);}}

示例代碼

作者：純潔的微笑
出處：http://www.ityouknow.com/?
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轉(zhuǎn)載于:https://my.oschina.net/cnarthurs/blog/1519609

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