由于项目中要用到spring boot结合mybatis做一个动态的数据源，所以自己做了一个，也踩了很多坑，这里把成果分享出来。如果是1.x的springboot版本可以看前面的，如果是2.x版本的可以看后面的，2.x版本的更简单方便。
一、Springboot + Mybatis 多数据源配置
1.Springboot.yml配置文件
server:
port: 9281
#spring:
# profiles:
# active: dev
#数据库1
datasource1:
url: jdbc:mysql://localhost:3306/ios666_history?useSSL=false&useUnicode=true
username: root
password:
driver-class-name: com.mysql.jdbc.Driver
#数据库2
datasource2:
url: jdbc:mysql://localhost:3306/av8d?useSSL=false&useUnicode=true
username: root
password:
driver-class-name: com.mysql.jdbc.Driver2.SpringbootApplication 禁止加载自身对DataSource的扫描
@SpringBootApplication(exclude = {
DataSourceAutoConfiguration.class
})
public class DatasourceApplication {
public static void main(String[] args) {
SpringApplication.run(DatasourceApplication.class, args);
}
}DataSourceConfig 对 Springboot.yml 读取
@Configuration
public class DataSourceConfig {
@Bean(name = "dbOneDataSource")
@Primary
@ConfigurationProperties(prefix = "datasource1") // application.yml 中对应属性的前缀
public DataSource dbOneDataSource() {
return DataSourceBuilder.create().build();
}
@Bean(name = "dbTwoDataSource")
@ConfigurationProperties(prefix = "datasource2") // application.yml 中对应属性的前缀
public DataSource dbTwoDataSource() {
return DataSourceBuilder.create().build();
}
}这里创建了2个Bean，由dbOneDataSource 和 dbTwoDataSource 读取并创建数据源。
二、数据源的创建
如果有多个就直接创建多个，下面说说 SqlSessionFactory && SqlSessionTemplate 创建 。为了方便管理，我用内部类去解决。
package com.sojson.datasource.config;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import javax.annotation.Resource;
import javax.sql.DataSource;
/**
*
* 开发公司：SOJSON在线工具 <p>
* 版权所有：© www.sojson.com<p>
* 博客地址：http://www.sojson.com/blog/ <p>
* <p>
* 说明：<br/>
*
* 如果有多个就直接创建多个，SqlSessionFactory && SqlSessionTemplate 创建
* <p>
*
* 区分 责任人 日期 <br/>
* 创建 周柏成 2018年05月01日22:33:18 <br/>
*
* @author zhou-baicheng
* @email [email protected]
* @version 1.0<br/>
*
*/
@Slf4j
public class MybatisConfig {
/**
* 第一个数据库 SqlSessionFactory && SqlSessionTemplate 创建
*/
@Configuration
@MapperScan(basePackages = {"com.sojson.datasource.one.mapper"},
sqlSessionFactoryRef = "sqlSessionFactoryOne",
sqlSessionTemplateRef = "sqlSessionTemplateOne")
public static class DBOne{
@Resource
DataSource dbOneDataSource;
@Bean
public SqlSessionFactory sqlSessionFactoryOne() throws Exception {
log.info("sqlSessionFactoryOne 创建成功。");
SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
factoryBean.setDataSource(dbOneDataSource);
factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/one/*.xml"));
return factoryBean.getObject();
}
@Bean
public SqlSessionTemplate sqlSessionTemplateOne() throws Exception {
SqlSessionTemplate template = new SqlSessionTemplate(sqlSessionFactoryOne()); // 使用上面配置的Factory
return template;
}
}
/**
* 第二个数据库 SqlSessionFactory && SqlSessionTemplate 创建
*/
@Configuration
@MapperScan(basePackages = {"com.sojson.datasource.two.mapper"},
sqlSessionFactoryRef = "sqlSessionFactoryTwo",
sqlSessionTemplateRef ="sqlSessionTemplateTwo" )
public static class DBTwo{
@Resource
DataSource dbTwoDataSource;
@Bean
public SqlSessionFactory sqlSessionFactoryTwo() throws Exception {
log.info("sqlSessionFactoryTwo 创建成功。");
SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
factoryBean.setDataSource(dbTwoDataSource);
、、
factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/two/*.xml"));
return factoryBean.getObject();
}
@Bean
public SqlSessionTemplate sqlSessionTemplateTwo() throws Exception {
SqlSessionTemplate template = new SqlSessionTemplate(sqlSessionFactoryTwo()); // 使用上面配置的Factory
return template;
}
}
}这里要详细说明的一下，因为创建了2套的SqlSessionFactory && SqlSessionTemplate，那怎么来区分或者说怎么分配数据源呢？
通过注释 ：basePackages = {"com.sojson.datasource.one.mapper"}来定义第一个数据源 SqlSessionFactory 的mapper目录。
通过注释 ：basePackages = {"com.sojson.datasource.two.mapper"}来定义第二个数据源 SqlSessionFactory 的mapper目录。
如果在运行中出现缺少 org/springframework/boot/bind/RelaxedPropertyResolver 证明你使用的是2.x版本，这里直接使用下面的方法，很简单。
第一步写好配置文件
server:
port: 8080
spring:
datasource:
master:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: 123456
slaver:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/dev?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: 123456
第二步 写好config配置类
1、主库数据源配置
@Configuration
@MapperScan(basePackages = "com.somta.springboot.dao.master", sqlSessionTemplateRef = "masterSqlSessionTemplate")
public class MasterDataSourceConfiguration {
@Value("${spring.datasource.master.driver-class-name}")
private String driverClassName;
@Value("${spring.datasource.master.url}")
private String url;
@Value("${spring.datasource.master.username}")
private String username;
@Value("${spring.datasource.master.password}")
private String password;
@Bean(name = "masterDataSource")
@Primary
public DataSource dataSource() {
DruidDataSource dataSource = new DruidDataSource();
dataSource.setDriverClassName(this.driverClassName);
dataSource.setUrl(this.url);
dataSource.setUsername(this.username);
dataSource.setPassword(this.password);
return dataSource;
}
@Bean(name = "masterSqlSessionFactory")
@Primary
public SqlSessionFactory sqlSessionFactory(@Qualifier("masterDataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mybatis/master/**/Mysql_*Mapper.xml"));
return bean.getObject();
}
@Bean(name = "masterTransactionManager")
@Primary
public DataSourceTransactionManager transactionManager(@Qualifier("masterDataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean(name = "masterSqlSessionTemplate")
@Primary
public SqlSessionTemplate sqlSessionTemplate(@Qualifier("masterSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
}2、从库的数据源配置信息
@Configuration
@MapperScan(basePackages = "com.somta.springboot.dao.slaver", sqlSessionTemplateRef = "slaverSqlSessionTemplate")
public class SlaverDataSourceConfiguration {
@Value("${spring.datasource.slaver.driver-class-name}")
private String driverClassName;
@Value("${spring.datasource.slaver.url}")
private String url;
@Value("${spring.datasource.slaver.username}")
private String username;
@Value("${spring.datasource.slaver.password}")
private String password;
@Bean(name = "slaverDataSource")
public DataSource dataSource() {
DruidDataSource dataSource = new DruidDataSource();
dataSource.setDriverClassName(this.driverClassName);
dataSource.setUrl(this.url);
dataSource.setUsername(this.username);
dataSource.setPassword(this.password);
return dataSource;
}
@Bean(name = "slaverSqlSessionFactory")
public SqlSessionFactory sqlSessionFactory(@Qualifier("slaverDataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mybatis/slaver/**/Mysql_*Mapper.xml"));
return bean.getObject();
}
@Bean(name = "slaverTransactionManager")
public DataSourceTransactionManager transactionManager(@Qualifier("slaverDataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean(name = "slaverSqlSessionTemplate")
public SqlSessionTemplate sqlSessionTemplate(@Qualifier("slaverSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
}注意在配置数据源的信息时，一定要通过@Primary配置一个主库，对于数据库配置部分与普通的数据源配置没有差异，新建一个DataSource，在创建一个SqlSessionTemplate，最后创建一个SqlSessionTemplate，分别以此注入即可，@MapperScan注解的扫描路径要分别对于相应的dao层