Loading external data into greenplum database table using different ways... Greenplum 有常规的COPY加载方法,有基于分布式的并行的gpfdist加载方法:COPY方式适合用于加载小数据:gpfdist适合大数据量加载:下文中将讨论这两种数据加载方式. gp_sydb=# select current_database(),current_user,current_schema(),session_user,c…
React-Native中的组件加载.卸载与setState问题. Warning: Can only update a mounted or mounting component. This usually means you called setState, replaceState, or forceUpdate on an unmounted component. This is a no-op. 通常我们会在componentWillMount方法中执行异步数据请求,然后调用setSt…