最近在学习SpringBoot的时候，需要同时用两个不同的数据库连接服务，在网上学习了之后，下文以连接一个MySQL数据库和一个SqlServer数据库为例。
配置数据源连接信息
在配置文件中，配置对应的数据库连接信息，相比于单数据源时连接信息的url属性在多数据源时应该为jdbc-url，请注意下图红色部分：
application.yml
spring:
datasource:
webproject:
type: mysql
driver-class-name: com.mysql.cj.jdbc.Driver
jdbc-url: jdbc:mysql://localhost:3306/webproject?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
username:
password:
workcontent:
type: sqlServer
driver-class-name: com.microsoft.sqlserver.jdbc.SQLServerDriver
jdbc-url: jdbc:sqlserver://localhost:1433;databaseName=myDatabase;encrypt=true;trustServerCertificate=true;characterEncoding=utf8;
username:
password: Maven配置数据库驱动
由于新版的官方Sqlserver驱动不支持TLSv1, TLSv1.1，我选择了较老的数据库驱动程序。
<!-- sqlserver驱动 -->
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>mssql-jdbc</artifactId>
<version>7.4.1.jre11</version>
</dependency>
<!-- MYSQL驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.33</version>
</dependency>创建数据源配置类
以下文中的 WorkContentDataSourceConfig 为例，基本的流程如下：
配置类声明
配置要该数据源相关的Mapper所在的的包扫描和要注入的Sql工厂实例
创建数据源DataSource
@ConfigurationProperties 用于注入application.yml中配置的数据库连接信息
@Primary 默认指定当前数据库，多数据源下需要配置@Primary，不然SpringBoot会找不到数据源注入，后续步骤最好也加上@Primary
创建Sql工厂，注册DataSource
@Qualifier 用于选择注入的bean对象
创建事务管理器
创建Sql模版对象
具体配置类信息如下：
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 org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;
/**
* @author yamu
* @version 1.0
* @description 工作库
* @date 2025/1/23 10:49
*/
@Configuration
@MapperScan(basePackages = {"org.cqw.baseproject.dao.workcontent"},
sqlSessionFactoryRef = "workContentSqlSessionFactory")
public class WorkContentDataSourceConfig {
@Bean(name = "workContentDataSource")
@ConfigurationProperties(prefix = "spring.datasource.workcontent")
@Primary
public DataSource dataSource() {
return DataSourceBuilder.create().build();
}
@Bean(name = "workContentSqlSessionFactory")
@Primary
public SqlSessionFactory sqlSessionFactory(@Qualifier("workContentDataSource") DataSource dataSource)
throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
bean.setMapperLocations(new PathMatchingResourcePatternResolver().
getResources("classpath:mapper/workcontent/*.xml"));
return bean.getObject();
}
@Bean(name = "workContentTransactionManager")
@Primary
public DataSourceTransactionManager transactionManager(@Qualifier("workContentDataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean(name = "workContentSqlSessionTemplate")
@Primary
public SqlSessionTemplate sqlSessionTemplate(@Qualifier("workContentSqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
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 org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;
/**
* @author yamu
* @version 1.0
* @description 项目库
* @date 2025/1/23 10:49
*/
@Configuration
@MapperScan(basePackages = {"org.cqw.baseproject.dao.webproject"}, sqlSessionFactoryRef = "webProjectSqlSessionFactory")
public class WebProjectDataSourceConfig {
@Bean(name = "webProjectDataSource")
@ConfigurationProperties(prefix = "spring.datasource.webproject")
public DataSource dataSource() {
return DataSourceBuilder.create().build();
}
@Bean(name = "webProjectSqlSessionFactory")
public SqlSessionFactory sqlSessionFactory(@Qualifier("webProjectDataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/webproject/*.xml"));
return bean.getObject();
}
@Bean(name = "webProjectTransactionManager")
public DataSourceTransactionManager transactionManager(@Qualifier("webProjectDataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean(name = "webProjectSqlSessionTemplate")
public SqlSessionTemplate sqlSessionTemplate(@Qualifier("webProjectSqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
return new SqlSessionTemplate(sqlSessionFactory);
}
}创建实体
实体所在的包需要和创建配置类中的第一步的 配置类声明的@MapperScan的basePackages值相对应。
package org.cqw.baseproject.dao.webproject;
@Repository
public interface FunctionMenuDao {
FunctionMenu queryById(int id);
List<FunctionMenu> queryAll();
}创建Mapper
由于有多个数据源，所以在/resources/mapper里面需要区分不同的数据库（即创建不同的文件夹，每个数据源扫描自己的mapper
.xml文件），如下图所示，注意和第三步创建Sql工厂，注册DataSource的SqlSessionFactory 中bean.setMapperLocations()里面的路径对应上，对于Mapper.xml里面的配置这里就不具体说明了。
FunctionMenuMapper.xml
<?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="org.cqw.baseproject.dao.webproject.FunctionMenuDao">
<select id="queryById" resultType="org.cqw.baseproject.entity.FunctionMenu">
SELECT * FROM FunctionMenu WHERE id = #{id}
</select>
<select id="queryAll" resultType="org.cqw.baseproject.entity.FunctionMenu">
SELECT * FROM FunctionMenu WHERE isDel = '0' AND status = '1' ORDER BY depth, id
</select>
</mapper>测试
关于 Service 和 ServiceImpl 这里就省略了
FunctionMenuController
@RestController
@RequestMapping("/functionMenu")
public class FunctionMenuController {
@Autowired
public FunctionMenuService functionMenuService;
@GetMapping("getAllMenuList")
public String getAllMenuList() {
var data = functionMenuService.getAllMenuList();
return R.success(data);//消息响应
}
}结果：
public FunctionMenuService functionMenuService;
@GetMapping("getAllMenuList")
public String getAllMenuList() {
var data = functionMenuService.getAllMenuList();
return R.success(data);//消息响应
}
}结果：
