[jira] [Comment Edited] (SPARK-38200) [SQL] Spark JDBC Savemode Supports replace

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

    [ https://issues.apache.org/jira/browse/SPARK-38200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17495322#comment-17495322 ] 

melin edited comment on SPARK-38200 at 2/21/22, 5:17 AM:
---------------------------------------------------------

[~beliefer]  

oracle: [https://docs.oracle.com/en/database/other-databases/nosql-database/21.1/sqlfornosql/adding-table-rows-using-insert-and-upsert-statements.html]

db2 or sqlserver
{code:java}
MERGE INTO mytable AS mt USING (
    SELECT * FROM TABLE (
        VALUES 
            (123, 'text')
    )
) AS vt(id, val) ON (mt.id = vt.id)
WHEN MATCHED THEN
    UPDATE SET val = vt.val
WHEN NOT MATCHED THEN
    INSERT (id, val) VALUES (vt.id, vt.val)
; {code}


was (Author: melin):
[~beliefer]  

oracle: [https://docs.oracle.com/en/database/other-databases/nosql-database/21.1/sqlfornosql/adding-table-rows-using-insert-and-upsert-statements.html]

> [SQL] Spark JDBC Savemode Supports replace
> ------------------------------------------
>
>                 Key: SPARK-38200
>                 URL: https://issues.apache.org/jira/browse/SPARK-38200
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.3.0
>            Reporter: melin
>            Priority: Major
>
> When writing data into a relational database, data duplication needs to be considered. Both mysql and postgres support upsert syntax.
> mysql:
> {code:java}
> replace into t(id, update_time) values(1, now()); {code}
> pg:
> {code:java}
> INSERT INTO %s (id,name,data_time,remark) VALUES ( ?,?,?,? ) ON CONFLICT (id,name) DO UPDATE SET id=excluded.id,name=excluded.name,data_time=excluded.data_time,remark=excluded.remark   {code}



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