与dynamic-datasource整合
PR参考
baomidou的dynamic-datasource
团队提交了一个相同需求的PR
原理
- 通过
DataSourceConfig.java
将ShardingJDBC
数据源配置为动态数据源之一。 - 通过
@DS(DataSourceConfig.SHARDING_DATA_SOURCE_NAME)
使用ShardingJDBC
的数据源进行分表操作
代码示例
依赖
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>dynamic-datasource-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.8</version>
</dependency>
DataSourceConfiguration配置
/**
* @Description 动态数据源配置
(切换为sharding-jdbc数据源 => @DS(DataSourceConfig.SHARDING_DATA_SOURCE_NAME))
*/
@Configuration
@AutoConfigureBefore({DynamicDataSourceAutoConfiguration.class,SpringBootConfiguration.class})
public class DataSourceConfiguration {
/**
* 分表数据源名称
*/
private static final String SHARDING_DATA_SOURCE_NAME = "sharding-data-source";
/**
* 动态数据源配置项
*/
@Autowired
private DynamicDataSourceProperties properties;
/**
* shardingjdbc有四种数据源,需要根据业务注入不同的数据源
*
* 1. 未使用分片, 脱敏的名称(默认): shardingDataSource;
* 2. 主从数据源: masterSlaveDataSource;
* 3. 脱敏数据源:encryptDataSource;
* 4. 影子数据源:shadowDataSource
*
*/
@Lazy
@Resource(name = "shardingDataSource")
AbstractDataSourceAdapter shardingDataSource;
@Bean
public DynamicDataSourceProvider dynamicDataSourceProvider() {
Map<String, DataSourceProperty> datasourceMap = properties.getDatasource();
return new AbstractDataSourceProvider() {
@Override
public Map<String, DataSource> loadDataSources() {
Map<String, DataSource> dataSourceMap = createDataSourceMap(datasourceMap);
// 将 shardingjdbc 管理的数据源也交给动态数据源管理
dataSourceMap.put(SHARDING_DATA_SOURCE_NAME, shardingDataSource);
return dataSourceMap;
}
};
}
/**
* 将动态数据源设置为首选的
* 当spring存在多个数据源时, 自动注入的是首选的对象
* 设置为主要的数据源之后,就可以支持shardingjdbc原生的配置方式了
*
* @return
*/
@Primary
@Bean
public DataSource dataSource(DynamicDataSourceProvider dynamicDataSourceProvider) {
DynamicRoutingDataSource dataSource = new DynamicRoutingDataSource();
dataSource.setPrimary(properties.getPrimary());
dataSource.setStrict(properties.getStrict());
dataSource.setStrategy(properties.getStrategy());
/**
* 动态多数据源提供者,
* 在DynamicRoutingDataSource需要要DynamicDataSourceProvider加载进去,
* 否则会导致datasource注入失败,抛出空指针异常
*/
dataSource.setProvider(dynamicDataSourceProvider);
dataSource.setP6spy(properties.getP6spy());
dataSource.setSeata(properties.getSeata());
return dataSource;
}
}
yml配置
server:
port: 8081
spring:
# 多数据源配置
datasource:
dynamic:
primary: mydb1
datasource:
mydb1:
url: jdbc:mysql://localhost:3306/mydb1?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
username: root
password: root
driver-class-name: com.mysql.cj.jdbc.Driver
# sharding-jdbc配置
shardingsphere:
# 打印sql
props:
sql:
show: true
datasource:
names: mydb2
mydb2:
type: com.alibaba.druid.pool.DruidDataSource
url: jdbc:mysql://localhost:3306/mydb2?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
driver-class-name: com.mysql.cj.jdbc.Driver
username: root
password: root
# 数据源其他配置
initialSize: 5
minIdle: 5
maxActive: 20
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
# 配置监控统计拦截的filters,去掉后监控界面sql无法统计,'wall'用于防火墙
#filters: stat,wall,log4j
maxPoolPreparedStatementPerConnectionSize: 20
useGlobalDataSourceStat: true
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
sharding:
# 表策略配置
tables:
# t_user 是逻辑表
t_user:
# 分表节点 可以理解为分表后的那些表 比如 t_user_1 ,t_user_2
actualDataNodes: mydb2.t_user_$->{1..2}
tableStrategy:
inline:
# 根据哪列分表
shardingColumn: age
# 分表算法 例如:age为奇数 -> t_user_2; age为偶数 -> t_user_1
algorithmExpression: t_user_$->{age % 2 + 1}
# keyGenerator:
# type: SNOWFLAKE
# # 对id列采用 sharding-jdbc的全局id生成策略
# column: id
# mybatis-plus
mybatis-plus:
mapper-locations: classpath*:/mapper/*Mapper.xml
# 实体扫描,多个package用逗号或者分号分隔
typeAliasesPackage: cn.agile.stats.*.entity
# 测试环境打印sql
configuration:
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
使用示例
public interface TUserService extends IService<TUser> {
/**
* 查询 全部用户(mydb1数据库)
* @return 全部用户
*/
List<TUser> listFromDB1();
}
@Service
@DS(DataSourceConfig.SHARDING_DATA_SOURCE_NAME)
public class TUserServiceImpl extends ServiceImpl<TUserMapper, TUser> implements TUserService {
@DS("mydb1")
@Override
public List<TUser> listFromDB1() {
// 查询 全部用户(mydb1数据库)
return this.list();
}
}
@SpringBootTest
class SpringbootDemoApplicationTests {
@Autowired
private TUserService userService;
@Test
void saveTest() {
List<TUser> users = new ArrayList<>(3);
users.add(new TUser("Ajia_1", "111111", 10));
users.add(new TUser("Ajia_2", "222222", 20));
users.add(new TUser("Ajia_3", "333333", 30));
userService.saveBatch(users);
}
@Test
void listTest() {
List<TUser> users1 = userService.listFromDB1();
// 查询没有数据插入的mydb1,没有查到数据
System.out.println("------ 【Result1】------ ");
users1.forEach(System.out::println);
List<TUser> users2 = userService.list();
// 查询插入了 3 条数据的mydb2,查询到了 3 条
System.out.println("------ 【Result2】------ ");
users2.forEach(System.out::println);
}
}