Realtime Compute for Apache Flink:SelectDB

Tabel sumber

CREATE TEMPORARY TABLE selectdb_source (
  order_id      BIGINT,
  user_id       BIGINT,
  total_amount  DECIMAL(10, 2),
  order_status  TINYINT,
  create_time   TIMESTAMP(3),
  product_name  STRING
) WITH (
  'connector'        = 'doris',
  'fenodes'          = 'selectdb-cn-*******.selectdbfe.rds.aliyuncs.com:8080',
  'table.identifier' = 'shop_db.orders',
  'username'         = 'admin',
  'password'         = '****'
);

Tabel sink

CREATE TEMPORARY TABLE selectdb_sink (
  order_id      BIGINT,
  user_id       BIGINT,
  total_amount  DECIMAL(10, 2),
  order_status  TINYINT,
  create_time   TIMESTAMP(3),
  product_name  STRING
) WITH (
  'connector'        = 'doris',
  'fenodes'          = 'selectdb-cn-*******.selectdbfe.rds.aliyuncs.com:8080',
  'table.identifier' = 'shop_db.orders',
  'username'         = 'admin',
  'password'         = '****',
  'sink.label-prefix' = 'flink_orders'  -- Harus unik secara global di semua pekerjaan
);

Tabel dimensi

SelectDB bertindak sebagai tabel dimensi lookup yang digabungkan dengan tabel fakta streaming.

-- Tabel fakta dari Kafka
CREATE TEMPORARY TABLE fact_table (
  `id`           BIGINT,
  `name`         STRING,
  `city`         STRING,
  `process_time` AS proctime()
) WITH (
  'connector' = 'kafka',
  ...
);

-- Tabel dimensi dari SelectDB
CREATE TEMPORARY TABLE dim_city (
  `city`     STRING,
  `level`    INT,
  `province` STRING,
  `country`  STRING
) WITH (
  'connector'        = 'doris',
  'fenodes'          = 'selectdb-cn-*******.selectdbfe.rds.aliyuncs.com:8080',
  'jdbc-url'         = 'jdbc:mysql://selectdb-cn-***.selectdbfe.rds.aliyuncs.com:9030',
  'table.identifier' = 'dim.dim_city',
  'username'         = 'admin',
  'password'         = '****'
);

-- Temporal join
SELECT a.id, a.name, a.city, c.province, c.country, c.level
FROM fact_table a
LEFT JOIN dim_city FOR SYSTEM_TIME AS OF a.process_time AS c
ON a.city = c.city;