Spring boot +Mybatis 实现多数据源（一：最简单版本）
多数据源的问题在实际项目中还是经常遇到的，例如读写分离的数据库、马甲类型服务器等。不多说上干货，特别说明下本人用的开发工具是idea。
创建Spring Boot项目
菜单 file–》new –》project–》spring initializer 填写自己的group、artifact之后 勾选web开启web属性 数据库选着mysql、mybatis
项目初始化完成，pom中加载分页组件、数据源后如下：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0modelVersion>
<groupId>com.rongdonggroupId>
<artifactId>waistcoatartifactId>
<version>0.0.1-SNAPSHOTversion>
<packaging>warpackaging>
<name>waistcoatname>
<description>description>
<parent>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-parentartifactId>
<version>2.0.0.RELEASEversion>
<relativePath/>
parent>
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
<java.version>1.8java.version>
<mybatis.pagehelper.version>4.1.6mybatis.pagehelper.version>
properties>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-jdbcartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>org.mybatis.spring.bootgroupId>
<artifactId>mybatis-spring-boot-starterartifactId>
<version>1.3.2version>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-tomcatartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<scope>runtimescope>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druidartifactId>
<version>1.0.11version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druid-spring-boot-starterartifactId>
<version>1.1.0version>
dependency>
<dependency>
<groupId>com.fasterxml.jackson.coregroupId>
<artifactId>jackson-coreartifactId>
dependency>
<dependency>
<groupId>com.fasterxml.jackson.coregroupId>
<artifactId>jackson-databindartifactId>
dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatypegroupId>
<artifactId>jackson-datatype-jodaartifactId>
dependency>
<dependency>
<groupId>com.fasterxml.jackson.modulegroupId>
<artifactId>jackson-module-parameter-namesartifactId>
dependency>
<dependency>
<groupId>com.github.pagehelpergroupId>
<artifactId>pagehelperartifactId>
<version>${mybatis.pagehelper.version}version>
dependency>
<dependency>
<groupId>org.apache.commonsgroupId>
<artifactId>commons-lang3artifactId>
<version>3.7version>
dependency>
dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
plugin>
<plugin>
<groupId>org.mybatis.generatorgroupId>
<artifactId>mybatis-generator-maven-pluginartifactId>
<version>1.3.2version>
<configuration>
<configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xmlconfigurationFile>
<overwrite>trueoverwrite>
<verbose>trueverbose>
configuration>
plugin>
plugins>
build>
project>
generator是自动生成mybatis 映射文件的，还不知道的可以百度下
在resouces下新建generator 文件夹 并新建generator.xml文件
内容如下：
<generatorConfiguration>
<classPathEntry location="G:\generator\mysql-connector-java-5.1.34.jar" />
<context id="DB2Tables" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressDate" value="true"/>
<property name="suppressAllComments" value="true"/>
commentGenerator>
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://127.0.0.1:3306/test?characterEncoding=utf8"
userId="root"
password="root">
jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
javaTypeResolver>
<javaModelGenerator targetPackage="com.rongdong.model.secondDataSource" targetProject="src">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
javaModelGenerator>
<sqlMapGenerator targetPackage="main.resources.mapping.secondDataSource" targetProject="src">
<property name="enableSubPackages" value="true"/>
sqlMapGenerator>
<javaClientGenerator type="XMLMAPPER" targetPackage="com.rongdong.dao.secondDataSource" targetProject="src">
<property name="enableSubPackages" value="true"/>
javaClientGenerator>
<table tableName="user_info" domainObjectName="SecondUserInfo" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false" />
context>
generatorConfiguration>习惯yml格式配置文件看着清晰点，将 application改为yml 的 多数据源配置如下：
server:
port: 8089
spring:
datasource:
primary:
jdbc-url: jdbc:mysql://127.0.0.1:3306/rongdong_waistcoat_db
username: root
password: root
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
filters: stat
maxActive: 20
initialSize: 1
maxWait: 60000
minIdle: 1
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: select 'x'
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
maxOpenPreparedStatements: 20
second:
jdbc-url: jdbc:mysql://127.0.0.1:3306/rongdong_jtx_db
username: root
password:root
#mybatis:
# mapper-locations: classpath:mapping/*.xml #指明mapper的xml文件存放位置
# type-aliases-package: com.rongdong.model #指明和数据库映射的实体的所在包
#pagehelper 分页插件
pagehelper:
helperDialect: mysql
reasonable: true
supportMethodsArguments: true
params: count=countSql
然后就是配置问题，我的因为我的数据库中表名相同，但是部分字段不一样 因此我在dao层、model、mapping这块给细分成了 多个部分
然后新建DataSourceConfig 数据源配置类
/**
* 数据源配置类
*
* @author hsh
* @create 2018-03-21 19:06
**/
@Configuration
public class DataSourceConfig {
@Bean(name = "primaryDataSource")
@Qualifier("primaryDataSource")
@ConfigurationProperties(prefix="spring.datasource.primary")
public DataSource primaryDataSource() {
return DataSourceBuilder.create().build();
}
@Bean(name = "secondDataSource")
@ConfigurationProperties(prefix = "spring.datasource.second") // application.properteis中对应属性的前缀
public DataSource dataSource2() {
return DataSourceBuilder.create().build();
}
}配置具体数据源
数据源A
/**
* Mybatis SqlSessionFactory多数据源配置
*
* @author hsh
* @create 2018-03-21 19:18
**/
@Configuration
@MapperScan(basePackages = {"com.rongdong.dao.priDataSource"}, sqlSessionFactoryRef = "sqlSessionFactory1")
public class MybatisDbAConfig {
public static final String MAPPER_LOCATION = "classpath:mapping/priDataSource/*.xml";
@Autowired
@Qualifier("primaryDataSource")
private DataSource ds1;
@Bean
public SqlSessionFactory sqlSessionFactory1() throws Exception {
SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
factoryBean.setDataSource(ds1); // 使用主数据源, 连接主库
Resource[] resource = new PathMatchingResourcePatternResolver().getResources(MybatisDbAConfig.MAPPER_LOCATION);
factoryBean.setMapperLocations(resource);
return factoryBean.getObject();
}
@Bean
public SqlSessionTemplate sqlSessionTemplate1() throws Exception {
return new SqlSessionTemplate(sqlSessionFactory1());
}
}数据源B
/**
* Mybatis SqlSessionFactory多数据源配置
*
* @author hsh
* @create 2018-03-21 19:48
**/
@Configuration
@MapperScan(basePackages = {"com.rongdong.dao.secondDataSource"}, sqlSessionFactoryRef = "sqlSessionFactory2")
public class MybatisDbBConfig {
public static final String MAPPER_LOCATION = "classpath:mapping/secondDataSource/*.xml";
@Autowired
@Qualifier("secondDataSource")
private DataSource ds2;
@Bean
public SqlSessionFactory sqlSessionFactory2() throws Exception {
SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
factoryBean.setDataSource(ds2);
Resource[] resource = new PathMatchingResourcePatternResolver().getResources(MybatisDbBConfig.MAPPER_LOCATION);
factoryBean.setMapperLocations(resource);
return factoryBean.getObject();
}
@Bean
public SqlSessionTemplate sqlSessionTemplate2() throws Exception {
SqlSessionTemplate template = new SqlSessionTemplate(sqlSessionFactory2());
return template;
}
}service 层具体调用了
/**
* 用户service实现
*
* @author hsh
* @create 2018-03-21 17:44
**/
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserInfoMapper userInfoMapper;
@Autowired
private SecondUserInfoMapper secondUserInfoMapper;
@Override
public UserInfo getUserById(String userId, Integer dataSourceType) throws Exception {
if (dataSourceType == DataSourceTypeEnum.one.getIndex()) {
return userInfoMapper.selectByPrimaryKey(userId);
} else if (dataSourceType == DataSourceTypeEnum.two.getIndex()) {
UserInfo userInfoTar = new UserInfo();
SecondUserInfo secondUserInfo = secondUserInfoMapper.selectByPrimaryKey(userId);
BeanUtils.copyProperties(secondUserInfo, userInfoTar);
return userInfoTar;
}
return null;
}
}controller代码
@RestController
@RequestMapping(value = "/user")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping(value = "{id}/{datatype}", method = RequestMethod.GET)
public UserInfo getUserById(@PathVariable("id") String userId,@PathVariable("datatype") Integer dataType) throws Exception {
return userService.getUserById(userId, dataType);
}
}调试
搞定！
1。提醒下spring boot 2.0之后多数据的配置url时候要用 jdbc-url替代url不然报错
jdbcUrl is required with driverClassName.
2。表名相同的情况下 dao层是不能名字一样的，因为默认是name实例化这个bean 会报错 因此实例化
以上就是最简单版本的Spring boot +Mybatis 实现多数据源，当然还有动态绑定数据源的，后期有时间在继续更新上来，欢迎大家指正！有问题的可以留言大家互相交流下！