我的问题是如何将一个
代码看起来像这样:
DataStream
转换为 List
,例如为了能够遍历它。代码看起来像这样:
package flinkoracle;
//imports
//....
public class FlinkOracle {
final static Logger LOG = LoggerFactory.getLogger(FlinkOracle.class);
public static void main(String[] args) {
LOG.info("Starting...");
// get the execution environment
StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
TypeInformation[] fieldTypes = new TypeInformation[]{BasicTypeInfo.STRING_TYPE_INFO,
BasicTypeInfo.STRING_TYPE_INFO,
BasicTypeInfo.STRING_TYPE_INFO,
BasicTypeInfo.STRING_TYPE_INFO};
RowTypeInfo rowTypeInfo = new RowTypeInfo(fieldTypes);
//get the source from Oracle DB
DataStream<?> source = env
.createInput(JDBCInputFormat.buildJDBCInputFormat()
.setDrivername("oracle.jdbc.driver.OracleDriver")
.setDBUrl("jdbc:oracle:thin:@localhost:1521")
.setUsername("user")
.setPassword("password")
.setQuery("select * from table1")
.setRowTypeInfo(rowTypeInfo)
.finish());
source.print().setParallelism(1);
try {
LOG.info("----------BEGIN----------");
env.execute();
LOG.info("----------END----------");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
LOG.info("End...");
}
}
非常感谢您的预先帮助。 敬礼 Tamas
public void flatMap(String sentence, Collector<Tuple2<String, String>>out)throws Exception { for (String word: sentence.split(",")) { LOG.info("FOR..."); out.collect(new Tuple2<String,String>(word,"")); } } } - Thomas