新建springboot工程，引入web、mysql、mybatis依赖
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< dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-web</ artifactId > </ dependency > < dependency > < groupId >org.mybatis.spring.boot</ groupId > < artifactId >mybatis-spring-boot-starter</ artifactId > < version >2.2.2</ version > </ dependency > < dependency > < groupId >mysql</ groupId > < artifactId >mysql-connector-java</ artifactId > < scope >runtime</ scope > </ dependency > < dependency > < groupId >org.projectlombok</ groupId > < artifactId >lombok</ artifactId > < optional >true</ optional > </ dependency > < dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-test</ artifactId > < scope >test</ scope > </ dependency > < dependency > < groupId >junit</ groupId > < artifactId >junit</ artifactId > < version >4.12</ version > < scope >test</ scope > </ dependency > |
在application.properties中配置多数据源
spring.datasource.primary.jdbc-url=jdbc:mysql://localhost:3306/ds0
spring.datasource.primary.username=root
spring.datasource.primary.password=root
spring.datasource.primary.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.secondary.jdbc-url=jdbc:mysql://localhost:3306/ds1
spring.datasource.secondary.username=root
spring.datasource.secondary.password=root
spring.datasource.secondary.driver-class-name=com.mysql.cj.jdbc.Driver
多数据源配置与单个数据源配置不同点在于，spring.datasource之后多了一个数据源名称primary/secondary用来区分不同的数据源；
初始化数据源
新建一个配置类，用来加载多个数据源完成初始化。
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@Configuration public class DataSourceConfiguration { @Primary @Bean @ConfigurationProperties (prefix = "spring.datasource.primary" ) public DataSource primaryDataSource() { return DataSourceBuilder.create().build(); } @Bean @ConfigurationProperties (prefix = "spring.datasource.secondary" ) public DataSource secondaryDataSource() { return DataSourceBuilder.create().build(); } } |
通过@ConfigurationProperties就可以知道这两个数据源分别加载了spring.datasource.primary.*和spring.datasource.secondary.*的配置。@Primary注解指定了主数据源，当不指定数据源时，就会使用该主数据源。
mybatis配置
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@Configuration @MapperScan ( basePackages = "com*.primary" , sqlSessionFactoryRef = "sqlSessionFactoryPrimary" , sqlSessionTemplateRef = "sqlSessionTemplatePrimary" ) public class PrimaryConfig { private DataSource primaryDataSource; public PrimaryConfig( @Qualifier ( "primaryDataSource" ) DataSource primaryDataSource) { this .primaryDataSource = primaryDataSource; } @Bean public SqlSessionFactory sqlSessionFactoryPrimary() throws Exception { SqlSessionFactoryBean bean = new SqlSessionFactoryBean(); bean.setDataSource(primaryDataSource); return bean.getObject(); } @Bean public SqlSessionTemplate sqlSessionTemplatePrimary() throws Exception { return new SqlSessionTemplate(sqlSessionFactoryPrimary()); } } |
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@Configuration @MapperScan ( basePackages = "com.*.secondary" , sqlSessionFactoryRef = "sqlSessionFactorySecondary" , sqlSessionTemplateRef = "sqlSessionTemplateSecondary" ) public class SecondaryConfig { private DataSource secondaryDataSource; public SecondaryConfig( @Qualifier ( "secondaryDataSource" ) DataSource secondaryDataSource) { this .secondaryDataSource = secondaryDataSource; } @Bean public SqlSessionFactory sqlSessionFactorySecondary() throws Exception { SqlSessionFactoryBean bean = new SqlSessionFactoryBean(); bean.setDataSource(secondaryDataSource); return bean.getObject(); } @Bean public SqlSessionTemplate sqlSessionTemplateSecondary() throws Exception { return new SqlSessionTemplate(sqlSessionFactorySecondary()); } } |
配置类上使用@MapperScan注解来指定当前数据源下定义的实体和mapper的包路径，还注入了sqlSessionFactory和sqlSessionTemplate，通过@Qualifier注解指定了对应的数据源，其名字对应在DataSourceConfiguration配置类中的数据源定义的函数名。
各个对数据源对应路径下的实体和mapper
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@Data @NoArgsConstructor public class UserPrimary { private Long id; private String user_name; private Integer age; public UserPrimary(String name, Integer age) { this .user_name = name; this .age = age; } } public interface UserMapperPrimary { @Select ( "SELECT * FROM USER_0 WHERE USER_NAME = #{name}" ) UserPrimary findByName( @Param ( "name" ) String name); @Insert ( "INSERT INTO USER_0 (USER_NAME, AGE) VALUES(#{name}, #{age})" ) int insert( @Param ( "name" ) String name, @Param ( "age" ) Integer age); @Delete ( "DELETE FROM USER_0" ) int deleteAll(); } |
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@Data @NoArgsConstructor public class UserSecondary { private Long id; private String user_name; private Integer age; public UserSecondary(String name, Integer age) { this .user_name = name; this .age = age; } } public interface UserMapperSecondary { @Select ( "SELECT * FROM USER_1 WHERE USER_NAME = #{name}" ) UserSecondary findByName( @Param ( "name" ) String name); @Insert ( "INSERT INTO USER_1 (USER_NAME, AGE) VALUES(#{name}, #{age})" ) int insert( @Param ( "name" ) String name, @Param ( "age" ) Integer age); @Delete ( "DELETE FROM USER_1" ) int deleteAll(); } |
测试
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@Test public void test() { // 往Primary数据源插入一条数据 userMapperPrimary.insert( "caocao" , 20 ); // 从Primary数据源查询刚才插入的数据，配置正确就可以查询到 UserPrimary userPrimary = userMapperPrimary.findByName( "caocao" ); Assert.assertEquals( 20 , userPrimary.getAge().intValue()); // 从Secondary数据源查询刚才插入的数据，配置正确应该是查询不到的 UserSecondary userSecondary = userMapperSecondary.findByName( "caocao" ); Assert.assertNull(userSecondary); // 往Secondary数据源插入一条数据 userMapperSecondary.insert( "sunquan" , 21 ); // 从Primary数据源查询刚才插入的数据，配置正确应该是查询不到的 userPrimary = userMapperPrimary.findByName( "sunquan" ); Assert.assertNull(userPrimary); // 从Secondary数据源查询刚才插入的数据，配置正确就可以查询到 userSecondary = userMapperSecondary.findByName( "sunquan" ); Assert.assertEquals( 21 , userSecondary.getAge().intValue()); } |
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原文链接：https://blog.csdn.net/leijie0322/article/details/125037244
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