Flink SQL的打印输出的几种方式

川长思鸟来 2023-03-01 09:49 1135阅读 0赞

打广告！！！！！！！！！！！！！！！！！！！！！！！！！：

先跟鸡哥打个广告 ，博客地址: [https://me.csdn.net/weixin\_47482194][https_me.csdn.net_weixin_47482194]

写的博客很有水平的，上了几次官网推荐了。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMxODY2Nzkz_size_16_color_FFFFFF_t_70][]

1，正常的print（）

2，在遇到FlinkSQL 代码里面有聚合算子的时候，会发现报错了。比如下面的代码：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMxODY2Nzkz_size_16_color_FFFFFF_t_70 1][]

> Exception in thread "main" org.apache.flink.table.api.TableException: AppendStreamTableSink doesn't support consuming update and delete changes which is produced by node Rank(strategy=\[UndefinedStrategy\], rankType=\[ROW\_NUMBER\], rankRange=\[rankStart=1, rankEnd=1\], partitionBy=\[category\], orderBy=\[sales DESC\], select=\[category, sales\])  
>     at org.apache.flink.table.planner.plan.optimize.program.FlinkChangelogModeInferenceProgram$SatisfyModifyKindSetTraitVisitor.createNewNode(FlinkChangelogModeInferenceProgram.scala:355)  
>     at org.apache.flink.table.planner.plan.optimize.program.FlinkChangelogModeInferenceProgram$SatisfyModifyKindSetTrai

这是因为Flink SQL不支持直接打印,推荐官网的方法：

>  
> 
>     public class DistinctTest {
>         private static final String PRINT_SINK_SQL = "create table sink_print ( \n" +
>                 " sales BIGINT," +
>                 " r_num BIGINT " +
>                 ") with ('connector' = 'print' )";
>     
>     
>         private static final String KAFKA_SQL = "CREATE TABLE t2 (\n" +
>                 " user_id VARCHAR ," +
>                 " item_id VARCHAR," +
>                 " category_id VARCHAR," +
>                 " behavior VARCHAR," +
>                 " proctime TIMESTAMP(3)," +
>                 " ts VARCHAR" +
>                 ") WITH (" +
>                 " 'connector' = 'kafka'," +
>                 " 'topic' = 'ods_kafka'," +
>                 " 'properties.bootstrap.servers' = 'localhost:9092'," +
>                 " 'properties.group.id' = 'test1'," +
>                 " 'format' = 'json'," +
>                 " 'scan.startup.mode' = 'earliest-offset'" +
>                 ")";
>     
>         public static void main(String[] args) {
>             StreamExecutionEnvironment bsEnv = StreamExecutionEnvironment.getExecutionEnvironment();
>             EnvironmentSettings bsSettings = EnvironmentSettings.newInstance().useBlinkPlanner().inStreamingMode().build();
>             StreamTableEnvironment tEnv = StreamTableEnvironment.create(bsEnv, bsSettings);
>             bsEnv.enableCheckpointing(5000);
>             bsEnv.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
>     //        tEnv.getConfig().getConfiguration().setBoolean("table.dynamic-table-options.enabled", true);
>     
>     // 接收来自外部数据源的 DataStream
>             DataStream<Tuple4<String, String, String, Long>> ds = bsEnv.addSource(new SourceFunction<Tuple4<String, String, String, Long>>() {
>                 @Override
>                 public void run(SourceContext<Tuple4<String, String, String, Long>> out) throws Exception {
>                     Random random = new Random();
>     
>                     while (true) {
>                         int sale = random.nextInt(1000);
>                         out.collect(new Tuple4<>("product_id", "category", "product_name", Long.valueOf(sale)));
>                         Thread.sleep(100L);
>                     }
>                 }
>     
>                 @Override
>                 public void cancel() {
>     
>                 }
>             });
>     // 把 DataStream 注册为表，表名是 “ShopSales”
>             tEnv.createTemporaryView("ShopSales", ds, "product_id, category, product_name, sales");
>             tEnv.createTemporaryView("aa", ds);
>             String topSql = "insert into sink_print SELECT * " +
>                     "FROM (" +
>                     "   SELECT sales," +
>                     "       ROW_NUMBER() OVER (PARTITION BY category ORDER BY sales DESC) as row_num" +
>                     "   FROM ShopSales ) " +
>                     "WHERE row_num = 1";
>             // Table table2 = tEnv.sqlQuery(topSql);
>     //        tEnv.toRetractStream(table2, Row.class).print("########");
>     
>     
>             tEnv.executeSql(PRINT_SINK_SQL);
>             tEnv.executeSql(topSql) ;
>             try {
>                 bsEnv.execute("aaaa");
>             } catch (Exception e) {
>                 e.printStackTrace();
>             }
>         }
>     }

3，还有就是执行SQL生成table之后转出stream执行：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMxODY2Nzkz_size_16_color_FFFFFF_t_70 2][] 注意结尾需要 env.execute();

4,在zeppelin执行sql：

添加type =update

![20200723173702706.png][]

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