shardingjdbc springboot 配置 有四台数据库，做两主两从

您好！针对这个问题，您可以按照以下步骤进行配置：

1. 引入ShardingSphere-JDBC和ShardingSphere-Proxy的相关依赖。

2. 配置ShardingSphere-JDBC的数据源。在配置数据源时，您需要配置主库和从库的数据源，示例代码如下：

spring.shardingsphere.datasource.names=ds0,ds1
spring.shardingsphere.datasource.ds0.type=com.zaxxer.hikari.HikariDataSource
spring.shardingsphere.datasource.ds0.driver-class-name=com.mysql.jdbc.Driver
spring.shardingsphere.datasource.ds0.jdbc-url=jdbc:mysql://localhost:3306/ds0
spring.shardingsphere.datasource.ds0.username=root
spring.shardingsphere.datasource.ds0.password=

spring.shardingsphere.datasource.ds1.type=com.zaxxer.hikari.HikariDataSource
spring.shardingsphere.datasource.ds1.driver-class-name=com.mysql.jdbc.Driver
spring.shardingsphere.datasource.ds1.jdbc-url=jdbc:mysql://localhost:3306/ds1
spring.shardingsphere.datasource.ds1.username=root
spring.shardingsphere.datasource.ds1.password=

3. 配置ShardingSphere-JDBC的分片规则。在配置分片规则时，您需要指定哪些表需要进行分片，以及分片规则。示例代码如下：

spring.shardingsphere.sharding.tables.user.actual-data-nodes=ds$->{0..1}.user$->{0..1}
spring.shardingsphere.sharding.tables.user.table-strategy.inline.sharding-column=user_id
spring.shardingsphere.sharding.tables.user.table-strategy.inline.algorithm-expression=user$->{user_id % 2}

spring.shardingsphere.sharding.default-database-strategy.inline.sharding-column=user_id
spring.shardingsphere.sharding.default-database-strategy.inline.algorithm-expression=ds$->{user_id % 2}

4. 配置ShardingSphere-Proxy。在配置ShardingSphere-Proxy时，您需要指定代理的数据源和分片规则。示例代码如下：

spring.shardingsphere.proxy.frontend.yaml=YAML
spring.shardingsphere.proxy.frontend.yaml.config-file=classpath:proxy.yaml

至此，您就可以完成ShardingSphere-JDBC和ShardingSphere-Proxy的配置。希望能对您有所帮助！