Flink SQL 批处理

    
        org.apache.flink
        flink-table-planner_2.11
        1.9.0
    
    
        org.apache.flink
        flink-table-api-java-bridge_2.11
        1.9.0
    
    
        org.apache.flink
        flink-table-api-scala-bridge_2.11
        1.9.0
    
    
        org.apache.flink
        flink-streaming-scala_2.11
        1.9.0
    
    
        org.apache.flink
        flink-table-common
        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;

public class FLinkSqlBatch {
   public static void main(String[] args) throws Exception {
      //1) 获取执行环境
      ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
      BatchTableEnvironment tableEnv = BatchTableEnvironment.create(env);
      /**
       * 1.csv
       * channel,subject,refer,reg,ord,pv,uv
       * 朋友圈,三科,H5,100,100,100,100
       * 朋友圈,数学,H5,100,100,100,100
       * 朋友圈,理科,H5,100,100,100,100
       * 朋友圈,编程,H5,100,100,100,100
       * 朋友圈,英语,H5,100,100,100,100
       * 朋友圈,通用,H5,100,100,100,100
       */
      // 2）读取数据
      DataSet csvInput = env
            .readCsvFile("D:\\code\\learn\\flink-sql\\src\\main\\resources\\1.csv")
            .ignoreFirstLine() //忽略第一行
            .pojoType(AdPojo.class, "channel", "subject", "refer", "reg", "ord", "pv", "uv");

      //3）将DataSet转换为Table，并注册为table1
      Table topScore = tableEnv.fromDataSet(csvInput);
      tableEnv.registerTable("table1", topScore);

      //4）自定义sql语句
      Table groupedByCountry = tableEnv.sqlQuery("select channel,subject,refer,reg,ord,pv,uv from table1");
      //5）转换回dataset
      DataSet result = tableEnv.toDataSet(groupedByCountry, AdPojo.class);
      //6）打印
      result.print();
   }
}

AdPojo{channel='朋友圈', subject='英语', refer='H5', reg='100', ord='100', pv='100', uv='100'}
AdPojo{channel='朋友圈', subject='通用', refer='H5', reg='100', ord='100', pv='100', uv='100'}
AdPojo{channel='朋友圈', subject='三科', refer='H5', reg='100', ord='100', pv='100', uv='100'}
AdPojo{channel='朋友圈', subject='理科', refer='H5', reg='100', ord='100', pv='100', uv='100'}
AdPojo{channel='朋友圈', subject='数学', refer='H5', reg='100', ord='100', pv='100', uv='100'}
AdPojo{channel='朋友圈', subject='编程', refer='H5', reg='100', ord='100', pv='100', uv='100'}

转载于:https://www.cnblogs.com/maoxiangyi/p/11586461.html