FLink Table API JAVA_BATCH_DEMO

org.apache.flink
flink-table-api-java-bridge_2.11
1.9.0



org.apache.flink
flink-table-planner_2.11
1.9.0



org.apache.flink
flink-streaming-scala_2.11
1.9.0

import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.table.api.Table;
import org.apache.flink.table.api.java.BatchTableEnvironment;

/**
 *
 * FLink Java Batch Table API DEMO
 *
 * @author: create by maoxiangyi
 * @version: v1.0
 */
public class WordCountSql {

   public static void main(String[] args) throws Exception {
      ExecutionEnvironment fbEnv = ExecutionEnvironment.getExecutionEnvironment();
      BatchTableEnvironment fbTableEnv = BatchTableEnvironment.create(fbEnv);

      DataSet input = fbEnv.fromElements(
            new WC("Hello", 1),
            new WC("Ciao", 1),
            new WC("Hello", 1)
      );


      // register the DataSet as table "WordCount"
      fbTableEnv.registerDataSet("WordCount", input, "word, frequency");

      // run a SQL query on the Table and retrieve the result as a new Table
      Table table = fbTableEnv.sqlQuery(
            "SELECT word, SUM(frequency) as frequency FROM WordCount GROUP BY word");

      DataSet result = fbTableEnv.toDataSet(table, com.xesv5.mxy.WC.class);

      result.print();
   }
}