本质就是引入两套数据源,在不同的业务实现中,使用不同的数据库操作
1:引入pom依赖
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>persistence-api</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.14</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.1</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.1</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
</dependency>
<!--解决No supported DataSource type found-->
<dependency>
<groupId>com.zaxxer</groupId>
<artifactId>HikariCP</artifactId>
<version>3.2.0</version>
</dependency>
</dependencies>
<!-- 如果不添加此节点mybatis的mapper.xml文件都会被漏掉。 -->
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
2:配置文件配置多数据源
application.properties
## test1 database
spring.datasource.test1.jdbc-url=jdbc:mysql://127.0.0.1:3306/master?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC&useSSL=false
spring.datasource.test1.username=root
spring.datasource.test1.password=123456
spring.datasource.test1.driver-class-name=com.mysql.jdbc.Driver
## test2 database
spring.datasource.test2.jdbc-url=jdbc:mysql://127.0.0.1:3306/slave?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC&useSSL=false
spring.datasource.test2.username=root
spring.datasource.test2.password=123456
spring.datasource.test2.driver-class-name=com.mysql.jdbc.Driver
3:生成对应的配置类文件 MasterConfig(主)
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.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import javax.sql.DataSource;
//表示这个类为一个配置类
@Configuration
// 配置mybatis的接口类放的地方
@MapperScan(basePackages = "com.qingnian.orm.demo.dao.master", sqlSessionFactoryRef = "masterSqlSessionFactory")
public class MasterConfig {
// 将这个对象放入Spring容器中
@Bean(name = "masterDataSource")
// 表示这个数据源是默认数据源
@Primary
// 读取application.properties中的配置参数映射成为一个对象
// prefix表示参数的前缀
@ConfigurationProperties(prefix = "spring.datasource.test1")
public DataSource getDateSource1() {
return DataSourceBuilder.create().build();
}
@Bean(name = "masterSqlSessionFactory")
// 表示这个数据源是默认数据源
@Primary
// @Qualifier表示查找Spring容器中名字为test1DataSource的对象
public SqlSessionFactory test1SqlSessionFactory(@Qualifier("masterDataSource") DataSource datasource)
throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(datasource);
bean.setMapperLocations(
// 设置mybatis的xml所在位置
new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/master/*.xml"));
return bean.getObject();
}
@Bean("masterSqlSessionTemplate")
// 表示这个数据源是默认数据源
@Primary
public SqlSessionTemplate test1sqlsessiontemplate(
@Qualifier("masterSqlSessionFactory") SqlSessionFactory sessionfactory) {
return new SqlSessionTemplate(sessionfactory);
}
}
SlaveConfig(副)
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.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import javax.sql.DataSource;
@Configuration
@MapperScan(basePackages = "com.qingnian.orm.demo.dao.slave", sqlSessionFactoryRef = "slaveSqlSessionFactory")
public class SlaveConfig {
@Bean(name = "slaveDataSource")
@ConfigurationProperties(prefix = "spring.datasource.test2")
public DataSource getDateSource2() {
return DataSourceBuilder.create().build();
}
@Bean(name = "slaveSqlSessionFactory")
public SqlSessionFactory test2SqlSessionFactory(@Qualifier("slaveDataSource") DataSource datasource)
throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(datasource);
bean.setMapperLocations(
new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/slave/*.xml"));
return bean.getObject();
}
@Bean("slaveSqlSessionTemplate")
public SqlSessionTemplate test2sqlsessiontemplate(
@Qualifier("slaveSqlSessionFactory") SqlSessionFactory sessionfactory) {
return new SqlSessionTemplate(sessionfactory);
}
}
项目结构:
4:使用,定义两套xml,dao层接口类,在业务层注入不同的持久层对象,按需求使用即可
import com.qingnian.orm.demo.dao.master.StudentDao;
import com.qingnian.orm.demo.entity.Student;
import com.qingnian.orm.demo.service.StudentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;
/*
任涛 -----专用
*/
@Service
@Slf4j
public class StudentServiceImpl implements StudentService {
@Autowired
@Qualifier("masterStudentDao")
private StudentDao masterStuDao;
@Autowired
@Qualifier("slaveStudentDao")
private com.qingnian.orm.demo.dao.slave.StudentDao slaveStuDao;
@Override
public Student getSlaveOne(Integer id) {
log.info("slaveStuDao执行了getSlaveOne方法");
return slaveStuDao.getOne(id);
}
@Override
public Student getMasterOne(Integer id) {
log.info("masterStuDao执行了getSlaveOne方法");
return masterStuDao.getOne(id);
}
@Override
public boolean getUnitAdd(Student student) {
student.setName("master+slave");
//联合新增
Integer integer = masterStuDao.addOne(student);
if(integer<1){
//新增失败,抛出异常
throw new RuntimeException("masterStuDao.addOne新增数据失败");
}
integer = slaveStuDao.addOne(student);
if(integer<1){
//新增失败,抛出异常
throw new RuntimeException("slaveStuDao.addOne新增数据失败");
}
return true;
}
}