在实际项目开发中可能存在需要同时操作两个数据库的场景,比如从A库读取数据,进行操作后往B库中写入数据,此时就需要进行多数据库配置。本文以操作本地和线上的MySQL数据库为例:
一、导入相关pom文件
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< dependency > < groupId >mysql</ groupId > < artifactId >mysql-connector-java</ artifactId > < scope >runtime</ scope > </ dependency >
< dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-jdbc</ artifactId > </ dependency >
< dependency > < groupId >org.mybatis</ groupId > < artifactId >mybatis</ artifactId > < version >3.5.5</ version > </ dependency >
< dependency > < groupId >com.alibaba</ groupId > < artifactId >druid</ artifactId > < version >1.2.3</ version > </ dependency >
< dependency > < groupId >org.mybatis</ groupId > < artifactId >mybatis-spring</ artifactId > < version >2.0.7</ version > </ dependency >
< dependency > < groupId >org.projectlombok</ groupId > < artifactId >lombok</ artifactId > < optional >true</ optional > </ dependency > |
二、application.yml配置文件编写
单数据源的配置如下:
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spring: datasource: driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://127.0.0.1:3306/meal_order?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8 username: root password: root type: com.alibaba.druid.pool.DruidDataSource |
多数据源的配置如下:
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spring: datasource: dev: driver-class-name: com.mysql.cj.jdbc.Driver jdbcUrl: jdbc:mysql://xxx.xx.xx.xx:3306/meal_order?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8 username: root password: root type: com.alibaba.druid.pool.DruidDataSource local: driver-class-name: com.mysql.cj.jdbc.Driver jdbcUrl: jdbc:mysql://127.0.0.1:3306/db2021?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8 username: root password: root type: com.alibaba.druid.pool.DruidDataSource |
经过对比可以发现:
1、多数据源的配置中需要指定具体的名称来区分不同的数据库(上述配置中的dev和local,名称可以根据具体需求自定义)
2、需要使用jdbcUrl代替url
三、数据库连接配置文件
dev数据源配置文件:
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@Configuration @MapperScan (basePackages = "com.multiple.mapper.dev" ,sqlSessionFactoryRef = "devSqlSessionFactory" ) public class DevDataSourceConfig { @Primary @Bean (name = "devDataSource" ) @ConfigurationProperties ( "spring.datasource.dev" ) public DataSource masterDataSource(){ return DataSourceBuilder.create().build(); }
@Bean (name = "devSqlSessionFactory" ) public SqlSessionFactory sqlSessionFactory( @Qualifier ( "devDataSource" ) DataSource dataSource) throws Exception { SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean(); sessionFactoryBean.setDataSource(dataSource); sessionFactoryBean.setMapperLocations( new PathMatchingResourcePatternResolver() .getResources( "classpath:mapping/dev/*.xml" )); return sessionFactoryBean.getObject(); } } |
local数据源配置文件:
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@Configuration @MapperScan (basePackages = "com.multiple.mapper.local" ,sqlSessionFactoryRef = "localSqlSessionFactory" ) public class LocalDataSourceConfig { @Primary @Bean (name = "localDataSource" ) @ConfigurationProperties ( "spring.datasource.local" ) public DataSource masterDataSource(){ return DataSourceBuilder.create().build(); }
@Bean (name = "localSqlSessionFactory" ) public SqlSessionFactory sqlSessionFactory( @Qualifier ( "localDataSource" ) DataSource dataSource) throws Exception { SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean(); sessionFactoryBean.setDataSource(dataSource); sessionFactoryBean.setMapperLocations( new PathMatchingResourcePatternResolver() .getResources( "classpath:mapping/local/*.xml" )); return sessionFactoryBean.getObject(); } } |
不同配置文件通过@MapperScan注解的内容来区分不同数据库下的mapper文件,通过@ConfigurationProperties注解来加载指定的数据源
以DevDataSourceConfig为例
四、主启动类注解修改
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@SpringBootApplication (exclude={<!--{C}%3C!%2D%2D% 20 %2D%2D%3E-->DataSourceAutoConfiguration. class }) |
目录结构如下:
五、测试
从dev库中查询数据,取出字段插入local库中:
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public interface DevMapper { @Select ( "select * from test" ) List<Test> getAllTest(); } |
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public interface LocalMapper { @Insert ( "insert into payment(serial) values (#{name})" ) int insertMessage(String name); } |
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@SpringBootTest class MultipleDatabaseApplicationTests {
@Autowired private DevMapper devMapper;
@Autowired private LocalMapper localMapper;
@Test void contextLoads() { List<com.multiple.pojo.Test> testList = devMapper.getAllTest(); for (com.multiple.pojo.Test test : testList){ localMapper.insertMessage(test.getAa()); } } } |
运行测试代码,从dev库中查出的数据可以成功添加至local库
该方法也适用需要使用多种不同的数据库的场景,比如MySQL和Oracle,修改数据源配置文件即可
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原文链接:https://blog.csdn.net/qq_44042316/article/details/123458902
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