[jira] [Comment Edited] (FLINK-27275) Support partial insert in flink-connector-jdbc

["Fangliang Liu (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-27275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17524158#comment-17524158 ] 

Fangliang Liu edited comment on FLINK-27275 at 4/19/22 7:58 AM:
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[~martijnvisser] Agreed, partial insert  are associated with corresponding storage . But we can really consider making a general solution at the flink level, and then decide whether it needs to be implemented according to the corresponding storage. [~jark] [~fsk119]  What do you think?


was (Author: liufangliang):
[~martijnvisser] Agreed, partial insert and corresponding storage are closely related. But we can really consider making a general solution at the flink level, and then decide whether it needs to be implemented according to the corresponding storage. [~jark] [~fsk119]  What do you think?

> Support partial insert in flink-connector-jdbc
> ----------------------------------------------
>
>                 Key: FLINK-27275
>                 URL: https://issues.apache.org/jira/browse/FLINK-27275
>             Project: Flink
>          Issue Type: New Feature
>          Components: Connectors / JDBC
>    Affects Versions: 1.14.3
>            Reporter: Fangliang Liu
>            Priority: Major
>
> I use the following statement to create a flink job.
> a field in the source data is null, but the field in mysql is not null, then the field will be overwritten by null after the record is written to the database. If I don't want this historical value to be overwritten by null, it is necessary to take out the historical value in the database in this task, and then update it to the database again, which is very costly for us.
> So, i think the choice of whether to update to the database if a field is null can actually be left to the use.
> {code:java}
>  CREATE TABLE IF NOT EXISTS t_source (
>     `user_id`  bigint,
>     `A` string,
>     `B` string,
>     `C` string,
>     `flag` varchar(256)
> )WITH (
>     'connector' = 'kafka',
>     'format' = 'canal-json',
>     'scan.startup.mode' = 'latest-offset',
>     ... ...
> );
> CREATE TABLE IF NOT EXISTS t_sink (
>     `user_id`  bigint,
>     `A` string,
>     `B` string,
>     `C` string,
>     `flag` varchar(256),
>     PRIMARY KEY (`user_id`) NOT ENFORCED
> )WITH (
>     'connector' = 'jdbc',
>     'url' = 'jdbc:mysql://xx.xx.xx.xx:xxx/test',
>     'table-name' = 'user',
>     ... ...
>  ); 
> INSERT INTO t_sink(
>     `user_id`,
>     `A`,
>     `B`,
>     `C`,
>     `flag`
> ) SELECT  `user_id`, `A`, `B`, `C`, `flag` FROM t_source;
> {code}
>  



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