Springboot+mybatis如何实现多数据源配置

在日常开发中，若遇到多个数据源的需求，怎么办呢？通过springboot集成mybatis实现多数据源配置，简单尝试一下。

新建springboot工程，引入web、mysql、mybatis依赖

		<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。

@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

@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());
}

}

@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

@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();

}

@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

	@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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