JDBC维表

前提条件

请务必确保您的账户下已创建了相应实例。

注意事项

• 创建Flink OpenSource SQL作业时，在作业编辑界面的“运行参数”处，“Flink版本”需要选择“1.12”，勾选“保存作业日志”并设置保存作业日志的OBS桶，方便后续查看作业日志。
• Flink跨源开发场景中直接配置跨源认证信息存在密码泄露的风险，优先推荐您使用DLI提供的跨源认证。

  跨源认证简介及操作方法请参考跨源认证简介。

语法格式

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CREATE TABLE  table_id (
  attr_name attr_type 
  (',' attr_name attr_type)* 
)
  WITH (
  'connector' = 'jdbc',
  'url' = '',
  'table-name' = '',
  'driver' = '',
  'username' = '',
  'password' = ''
);

参数说明

数据类型映射

示例

从Kafka源表中读取数据，将JDBC表作为维表，并将二者生成的表信息写入Kafka结果表中，其具体步骤如下：

1. 参考增强型跨源连接，在DLI上根据MySQL和Kafka所在的虚拟私有云和子网分别创建相应的增强型跨源连接，并绑定所要使用的Flink弹性资源池。
2. 设置MySQL和Kafka的安全组，添加入向规则使其对Flink的队列网段放通。参考测试地址连通性分别根据MySQL和Kafka的地址测试队列连通性。若能连通，则表示跨源已经绑定成功，否则表示未成功。
3. 连接MySQL数据库实例，在flink数据库中创建相应的表，作为维表，表名为area_info，SQL语句如下：

   CREATE TABLE `flink`.`area_info` (
   	`area_id` VARCHAR(32) NOT NULL,
   	`area_province_name` VARCHAR(32) NOT NULL,
   	`area_city_name` VARCHAR(32) NOT NULL,
   	`area_county_name` VARCHAR(32) NOT NULL,
   	`area_street_name` VARCHAR(32) NOT NULL,
   	`region_name` VARCHAR(32) NOT NULL,
   	PRIMARY KEY (`area_id`)
   )	ENGINE = InnoDB
   	DEFAULT CHARACTER SET = utf8mb4
   	COLLATE = utf8mb4_general_ci;

4. 连接MySQL数据库实例，向JDBC维表area_info中插入测试数据，其语句如下：

   insert into flink.area_info
     (area_id, area_province_name, area_city_name, area_county_name, area_street_name, region_name) 
     values
     ('330102', 'a1', 'b1', 'c1', 'd1', 'e1'),
     ('330106', 'a1', 'b1', 'c2', 'd2', 'e1'),
     ('330108', 'a1', 'b1', 'c3', 'd3', 'e1'),  ('330110', 'a1', 'b1', 'c4', 'd4', 'e1');

5. 参考创建Flink OpenSource作业，创建flink opensource sql作业，输入以下作业运行脚本，提交运行作业。该作业脚本将Kafka为数据源，JDBC作为维表，数据写入到Kafka结果表。
   注意：创建作业时，在作业编辑界面的“运行参数”处，“Flink版本”选择“1.12”，勾选“保存作业日志”并设置保存作业日志的OBS桶，方便后续查看作业日志。如下脚本中的加粗参数请根据实际环境修改。

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   CREATE TABLE orders ( order_id string, order_channel string, order_time string, pay_amount double, real_pay double, pay_time string, user_id string, user_name string, area_id string, proctime as Proctime() ) WITH ( 'connector' = 'kafka', 'topic' = 'KafkaSourceTopic', 'properties.bootstrap.servers' = 'KafkaAddress1:KafkaPort,KafkaAddress2:KafkaPort', 'properties.group.id' = 'jdbc-order', 'scan.startup.mode' = 'latest-offset', 'format' = 'json' ); --创建地址维表 create table area_info ( area_id string, area_province_name string, area_city_name string, area_county_name string, area_street_name string, region_name string ) WITH ( 'connector' = 'jdbc', 'url' = 'jdbc:mysql://JDBCAddress:JDBCPort/flink',--其中url中的flink表示MySQL中area_info表所在的数据库名 'table-name' = 'area_info', 'username' = 'JDBCUserName', 'password' = 'JDBCPassWord' ); --根据地址维表生成详细的包含地址的订单信息宽表 create table order_detail( order_id string, order_channel string, order_time string, pay_amount double, real_pay double, pay_time string, user_id string, user_name string, area_id string, area_province_name string, area_city_name string, area_county_name string, area_street_name string, region_name string ) with ( 'connector' = 'kafka', 'topic' = 'KafkaSinkTopic', 'properties.bootstrap.servers' = 'KafkaAddress1:KafkaPort,KafkaAddress2:KafkaPort', 'format' = 'json' ); insert into order_detail select orders.order_id, orders.order_channel, orders.order_time, orders.pay_amount, orders.real_pay, orders.pay_time, orders.user_id, orders.user_name, area.area_id, area.area_province_name, area.area_city_name, area.area_county_name, area.area_street_name, area.region_name from orders left join area_info for system_time as of orders.proctime as area on orders.area_id = area.area_id;

6. 连接Kafka集群，向Kafka的source topic中插入如下测试数据：

   {"order_id":"202103241606060001", "order_channel":"appShop", "order_time":"2021-03-24 16:06:06", "pay_amount":"200.00", "real_pay":"180.00", "pay_time":"2021-03-24 16:10:06", "user_id":"0001", "user_name":"Alice", "area_id":"330106"}
   
   {"order_id":"202103251202020001", "order_channel":"miniAppShop", "order_time":"2021-03-25 12:02:02", "pay_amount":"60.00", "real_pay":"60.00", "pay_time":"2021-03-25 12:03:00", "user_id":"0002", "user_name":"Bob", "area_id":"330110"}
   
   {"order_id":"202103251505050001", "order_channel":"qqShop", "order_time":"2021-03-25 15:05:05", "pay_amount":"500.00", "real_pay":"400.00", "pay_time":"2021-03-25 15:10:00", "user_id":"0003", "user_name":"Cindy", "area_id":"330108"}

7. 连接Kafka集群，在Kafka的sink topic读取数据，结果参考如下：

   {"order_id":"202103241606060001","order_channel":"appShop","order_time":"2021-03-24 16:06:06","pay_amount":200.0,"real_pay":180.0,"pay_time":"2021-03-24 16:10:06","user_id":"0001","user_name":"Alice","area_id":"330106","area_province_name":"a1","area_city_name":"b1","area_county_name":"c2","area_street_name":"d2","region_name":"e1"}
   
   {"order_id":"202103251202020001","order_channel":"miniAppShop","order_time":"2021-03-25 12:02:02","pay_amount":60.0,"real_pay":60.0,"pay_time":"2021-03-25 12:03:00","user_id":"0002","user_name":"Bob","area_id":"330110","area_province_name":"a1","area_city_name":"b1","area_county_name":"c4","area_street_name":"d4","region_name":"e1"}
   
   {"order_id":"202103251505050001","order_channel":"qqShop","order_time":"2021-03-25 15:05:05","pay_amount":500.0,"real_pay":400.0,"pay_time":"2021-03-25 15:10:00","user_id":"0003","user_name":"Cindy","area_id":"330108","area_province_name":"a1","area_city_name":"b1","area_county_name":"c3","area_street_name":"d3","region_name":"e1"}

常见问题

无。