FlinkSQL Kafka表开发规则

Kafka作为sink表时必须指定“topic”配置项

【示例】向Kafka的“test_sink”主题插入一条消息：

CREATE TABLE KafkaSink(
   `user_id` VARCHAR,
   `user_name` VARCHAR,
   `age` INT 
) WITH (
   'connector' = 'kafka',
   'topic' = 'test_sink',
   'properties.bootstrap.servers' = 'Kafka的Broker实例业务IP:Kafka端口号',
   'scan.startup.mode' = 'latest-offset',
   'value.format' = 'csv',
   'properties.sasl.kerberos.service.name' = 'kafka',
   'properties.security.protocol' = 'SASL_PLAINTEXT',
   'properties.kerberos.domain.name' = 'hadoop.系统域名' 
);
INSERT INTO KafkaSink (`user_id`, `user_name`, `age`)VALUES ('1', 'John Smith', 35);

Kafka作为source表时必须指定“properties.group.id”配置项

【示例】以“testGroup”为用户组读取主题为“test_sink”的Kafka消息：

CREATE TABLE KafkaSource(
   `user_id` VARCHAR,
   `user_name` VARCHAR,
   `age` INT 
) WITH (
   'connector' = 'kafka',
   'topic' = 'test_sink',
   'properties.bootstrap.servers' = 'Kafka的Broker实例业务IP:Kafka端口号',
   'scan.startup.mode' = 'latest-offset',
   'properties.group.id' = 'testGroup',
   'value.format' = 'csv',
   'properties.sasl.kerberos.service.name' = 'kafka',
   'properties.security.protocol' = 'SASL_PLAINTEXT',
   'properties.kerberos.domain.name' = 'hadoop.系统域名' 
);
SELECT * FROM KafkaSource;

不能同时设置“topic-pattern”和“topic”配置项

topic-pattern：主题模式，用于source表，可使用正则表达式的主题名称。

【示例】以下source表将订阅所有以“test-topic-”开头，单个数字结尾的主题消息：

CREATE TABLE payments ( 
    payment_id INT, 
    customer_id INT, 
    payment_date TIMESTAMP(3), 
    payment_amount DECIMAL(10, 2)
) WITH ( 
    'connector' = 'kafka', 
    'topic-pattern' = 'test-topic-[0-9]', 
    'properties.bootstrap.servers' = 'localhost:9092', 
    'format' = 'json'
);
SELECT * FROM payments WHERE payment_amount < 500;