所以你可以查看所有的内容或任何表格，可以在页面用到的每个数据库里执行任意的查询。
So far you can view the full contents of any table and run arbitrary queries on each database a page is using.
和数据库建立连接是一项较重的耗费资源的过程。无论任何应用程序需要在任何数据库服务器上执行任意的查询语句，我们第一步都需要建立与数据库的连接。
If any application needs to fire any query against any database server, we need to first establish a connection with server and then execute the query against that database server.
除了后台图，SPARQL还能查询任意数量的命名图。
In addition to the background graph, SPARQL can query any number of named graphs.
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