spark定制之二：start.scala中的DSL

经过类的隐式转换可让写脚本变得更容易（写入"select * from testperson" hqlgo直接处结果，"select * from testperson" saveto somefile直接写入文件）：java def getRegisterString(rddname:String,classname:String,tablename:String,tabledef:String

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