Flink SQL 常用作业sql

flink sql常用配置

设置输出结果格式
SET sql-client.execution.result-mode=tableau;

kafka source to mysql sink

kafka 
topic: bop_log_realtime
数据结构：
{"timestamp":"2023-10-31 14:26:02.528","serverip":"10.13.177.209","level":"INFO","servicename":"bop-fms-query-info","traceid":"","spanid":"","parent":"","message":"Resolving eureka endpoints via configuration"}

mysql表：
库名：flink_test
CREATE TABLE `bop_log_realtime_warning` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `serverip` varchar(255) NOT NULL DEFAULT '',
  `timestamp` varchar(255) NOT NULL DEFAULT '',
  `level` varchar(255) NOT NULL DEFAULT '',
  `servicename` varchar(255) NOT NULL DEFAULT '',
  `traceid` varchar(255) NOT NULL DEFAULT '',
  `spanid` varchar(255) NOT NULL DEFAULT '',
  `parent` varchar(255) NOT NULL DEFAULT '',
  `message` varchar(255) NOT NULL DEFAULT '',
  `updateTime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE kafka_log_realtime_json (
 `serverip` STRING
  ,`timestamp` STRING
  ,`level` STRING
  ,`servicename` STRING
  ,`traceid` STRING
  ,`spanid` STRING
  ,`parent` STRING
  ,`message` STRING
) WITH (
 'connector' = 'kafka',
 'topic' = 'bop_log_realtime',
 'properties.bootstrap.servers' = '10.2.25.221:9092,10.2.25.221:9093',
 'properties.group.id' = 'testGroup2',
 'format' = 'json',
 'scan.startup.mode' = 'latest-offset'
);

CREATE TABLE bop_log_realtime_warning (
    `serverip` STRING
    ,`timestamp` STRING
    ,`level` STRING
    ,`servicename` STRING
    ,`traceid` STRING
    ,`spanid` STRING
    ,`parent` STRING
    ,`message` STRING
) WITH (
'connector' = 'jdbc'
,'url' = 'jdbc:mysql://m3309i.hebe.grid.xx.com.cn:3309/flink_test?zeroDateTimeBehavior=convertToNull&characterEncoding=utf-8&useSSL=false&autoReconnect=true&serverTimezone=Asia/Shanghai'
,'username' = 'super_mis'
,'password' = 'mis_password'
,'table-name' = 'bop_log_realtime_warning'
);

insert into bop_log_realtime_warning 
SELECT
    `serverip` 
    ,`timestamp` 
    ,`level` 
    ,`servicename` 
    ,`traceid` 
    ,`spanid` 
    ,`parent` 
    ,`message` 
 FROM kafka_log_realtime_json;

窗口函数 开窗

datagen 自动生成数据表

CREATE TABLE ws (
  id INT,
  vc INT,
  pt AS PROCTIME(), --处理时间
  et AS cast(CURRENT_TIMESTAMP as timestamp(3)), --事件时间
  WATERMARK FOR et AS et - INTERVAL '5' SECOND --watermark
) WITH (
  'connector' = 'datagen',
  'rows-per-second' = '10',
  'fields.id.min' = '1',
  'fields.id.max' = '3',
  'fields.vc.min' = '1',
  'fields.vc.max' = '100'
);

tumble 滚动窗口

滚动窗口 窗口大小5秒
select
  id,
  sum(vc) vcSum,
  window_start,
  window_end
 from table(
 	TUMBLE(table ws, descriptor(et), INTERVAL '5' SECOND)
 )
 group by id, window_start, window_end;

hop 滑动窗口

滑动窗口 滑动步长5秒 窗口大小10秒
注意：窗口大小=滑动步长的整数倍（底层会优化成多个小滚动窗口）
select
  id,
  sum(vc) vcSum,
  window_start,
  window_end
 from table(
 	hop(table ws, descriptor(et), INTERVAL '5' SECOND, INTERVAL '10' SECOND)
 )
 group by id, window_start, window_end;

cumulate 累积窗口

注意：窗口大小=累积步长的整数倍
select
  id,
  sum(vc) vcSum,
  window_start,
  window_end
 from table(
 	CUMULATE(table ws, descriptor(et), INTERVAL '5' SECOND)
 )
 group by id, window_start, window_end;

grouping sets 多维分析

select
  id,
  sum(vc) vcSum,
  window_start,
  window_end
 from table(
 	TUMBLE(table ws, descriptor(et), INTERVAL '5' SECOND)
 )
 group by window_start, window_end,
 grouping sets ( (id) );

over 函数

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