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配置项说明
spring.shardingsphere.datasource.names= # 省略数据源配置，请参考使用手册
spring.shardingsphere.rules.database-discovery.data-sources.<database-discovery-data-source-name>.data-source-names= # 数据源名称，多个数据源用逗号分隔 如：ds_0, ds_1
spring.shardingsphere.rules.database-discovery.data-sources.<database-discovery-data-source-name>.discovery-heartbeat-name= # 检测心跳名称
spring.shardingsphere.rules.database-discovery.data-sources.<database-discovery-data-source-name>.discovery-type-name= # 数据库发现类型名称
spring.shardingsphere.rules.database-discovery.discovery-heartbeats.<discovery-heartbeat-name>.props.keep-alive-cron= # cron 表达式，如：'0/5 * * * * ?'
spring.shardingsphere.rules.database-discovery.discovery-types.<discovery-type-name>.type= # 数据库发现类型，如：MGR、openGauss
spring.shardingsphere.rules.database-discovery.discovery-types.<discovery-type-name>.props.group-name= # 数据库发现类型必要参数，如 MGR 的 group-name
