多数据源,复杂的就直接上分布式数据库中间件,简单的考虑多数据源。
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.3.0.RELEASE
com.example
multisource
0.0.1-SNAPSHOT
multisource
Demo project for Spring Boot
1.8
org.springframework.boot
spring-boot-starter-web
org.mybatis.spring.boot
mybatis-spring-boot-starter
2.1.2
org.mybatis.spring.boot
mybatis-spring-boot-starter
2.0.0
com.alibaba
druid-spring-boot-starter
1.1.10
mysql
mysql-connector-java
runtime
org.projectlombok
lombok
true
org.springframework.boot
spring-boot-starter-test
test
org.junit.vintage
junit-vintage-engine
org.springframework.boot
spring-boot-maven-plugin
基础配置
spring.datasource.one.url=jdbc:mysql://localhost:3306/db01?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC
spring.datasource.one.username=root
spring.datasource.one.password=
spring.datasource.one.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.two.url=jdbc:mysql://localhost:3306/db02?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC
spring.datasource.two.username=root
spring.datasource.two.password=
spring.datasource.two.type=com.alibaba.druid.pool.DruidDataSource
#Spring Boot 默认是不注入这些属性值的,需要自己绑定
#druid 数据源专有配置
#配置初始化大小、最小、最大
spring.datasource.initialSize= 5
spring.datasource.minIdle= 5
spring.datasource.maxActive= 20
#配置获取连接等待超时的时间
spring.datasource.maxWait= 60000
#配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒
spring.datasource.timeBetweenEvictionRunsMillis= 60000
#配置一个连接在池中最小生存的时间,单位是毫秒
spring.datasource.minEvictableIdleTimeMillis= 300000
#用来检测连接是否有效的sql,要求是一个查询语句,常用select 'x'。
# 如果validationQuery为null,testOnBorrow、testOnReturn、testWhileIdle都不会起作用。
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
#配置监控统计拦截的filters,stat:监控统计、log4j:日志记录、wall:防御sql注入
#如果允许时报错 java.lang.ClassNotFoundException: org.apache.log4j.Priority
#则导入 log4j 依赖即可,Maven 地址: https://mvnrepository.com/artifact/log4j/log4j
spring.datasource.filters=stat,wall,log4j
#是否缓存preparedStatement,也就是PSCache。PSCache对支持游标的数据库性能提升巨大,比如说oracle。在mysql下建议关闭。
pring.datasource.poolPreparedStatements= true
spring.datasource.maxPoolPreparedStatementPerConnectionSize= 20
spring.datasource.useGlobalDataSourceStat= true
# 配置监控统计拦截的filters
spring.datasource.stat-view-servlet.url-pattern=/druid/*
spring.datasource.stat-view-servlet.reset-enable= false
spring.datasource.druid.stat-view-servlet.login-username=admin
spring.datasource.druid.stat-view-servlet.login-password=123
spring.datasource.druid.stat-view-servlet.enabled=true
#设置ip黑名单和白名单
#spring.datasource.druid.stat-view-servlet.allow=127.0.0.1
#spring.datasource.druid.stat-view-servlet.deny=
#过滤所有请求
spring.datasource.url-pattern= /*
#排除哪些请求
spring.datasource.web-stat-filter.exclusions= "*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*"
启动类
@SpringBootApplication
@MapperScan("com.example.multisource.mapper1,com.example.multisource.mapper2")
public class MultisourceApplication {
public static void main(String[] args) {
SpringApplication.run(MultisourceApplication.class, args);
}
}
二、配置数据源
import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.sql.DataSource;
@Configuration
public class DataSourceConfig {
@Bean
@ConfigurationProperties(prefix = "spring.datasource.one")
DataSource dsOne() {
return DruidDataSourceBuilder.create().build();
}
@Bean
@ConfigurationProperties(prefix = "spring.datasource.two")
DataSource dsTwo() {
return DruidDataSourceBuilder.create().build();
}
}
三、配置mybatis连接数据源1
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 javax.annotation.Resource;
import javax.sql.DataSource;
@Configuration
@MapperScan(basePackages = "com.example.multisource.mapper1",sqlSessionFactoryRef = "sqlSessionFactory1",sqlSessionTemplateRef = "sqlSessionTemplate1")
public class MyBatisConfigOne {
@Resource(name = "dsOne")
DataSource dsOne;
@Bean
SqlSessionFactory sqlSessionFactory1() {
SqlSessionFactory sessionFactory = null;
try {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
//如果采用xml文件映射,需要指定xml文件位置,不然会报错:Invalid bound statement (not found):
//bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/*.xml"));
bean.setDataSource(dsOne);
sessionFactory = bean.getObject();
} catch (Exception e) {
e.printStackTrace();
}
return sessionFactory;
}
@Bean
SqlSessionTemplate sqlSessionTemplate1() {
return new SqlSessionTemplate(sqlSessionFactory1());
}
}
四、配置mybatis连接数据源2
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;
@Configuration
@MapperScan(basePackages = "com.example.multisource.mapper2",sqlSessionFactoryRef = "sqlSessionFactory2",sqlSessionTemplateRef = "sqlSessionTemplate2")
public class MyBatisConfigTwo {
@Resource(name = "dsTwo")
DataSource dsTwo;
@Bean
SqlSessionFactory sqlSessionFactory2() {
SqlSessionFactory sessionFactory = null;
try {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
//如果采用xml文件映射,需要指定xml文件位置,不然会报错:Invalid bound statement (not found):
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/*.xml"));
bean.setDataSource(dsTwo);
sessionFactory = bean.getObject();
} catch (Exception e) {
e.printStackTrace();
}
return sessionFactory;
}
@Bean
SqlSessionTemplate sqlSessionTemplate2() {
return new SqlSessionTemplate(sqlSessionFactory2());
}
}
五、创建mapper1包,并创建UserMapperOne
package com.example.multisource.mapper1;
import com.example.multisource.entity.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;
import java.util.List;
/*@Mapper
@Repository*/
public interface UserMapperOne {
@Select("select * from user")
List getAllUser();
}
五、创建mapper2包,并创建UserMapper
import com.example.multisource.entity.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;
import java.util.List;
/*@Mapper
@Repository*/
public interface UserMapper {
@Select("select * from user")
List getAllUser();
List getAllUser1();
}
六、哦,补上实体类
@Data
public class User {
Integer id;
String username;
String password;
}
七、创建resources下mapper文件夹,创建映射文件
八、最后写个测试类
@RestController
public class TestController {
@Resource
UserMapperOne userMapperOne;
@Resource
UserMapper userMapper;
@GetMapping("/get1")
public Object getUserByDatasource1(){
return userMapperOne.getAllUser();
}
@GetMapping("/get2")
public Object getUserByDatasource2(){
return userMapper.getAllUser();
}
@GetMapping("/get3")
public Object getUserByDatasource3(){
return userMapper.getAllUser1();
}
}
测试条件:两个数据源使用的是不相同的数据库
1./get1是使用注解生成的sql查询语句
2./get2是使用注解生成的sql查询语句
3./get3是使用映射文件产生sql查询语句