Springboot集成mybatis实现多数据源配置详解流程

2022-11-13 09:11:50 流程集成详解

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());
    }

到此这篇关于Springboot集成mybatis实现多数据源配置详解流程的文章就介绍到这了,更多相关Springboot多数据源配置内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持！

相关文章