[jira] [Commented] (BEAM-2376) JdbcIO should allow multiple statements

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

    [ https://issues.apache.org/jira/browse/BEAM-2376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17291560#comment-17291560 ] 

Maxim Ivanov commented on BEAM-2376:
------------------------------------

For those interested, there is a possible workaround to use CTE (at least for postgres):

```
with first as (
  INSERT INTO ...
), second as (
  INSERT INTO ...
)
SELECT 1;
```

> JdbcIO should allow multiple statements
> ---------------------------------------
>
>                 Key: BEAM-2376
>                 URL: https://issues.apache.org/jira/browse/BEAM-2376
>             Project: Beam
>          Issue Type: Improvement
>          Components: io-java-jdbc
>    Affects Versions: Not applicable
>            Reporter: Rik Nauta
>            Priority: P3
>             Fix For: Not applicable
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> Right now the JdbcIO pipeline adds a single Write statement to the batch per PCollection element. This makes it difficult to execute several statements that require a specific order (for instance due to constraints in the DB), since JDBC doesn't allow multiple statements in a single "addBatch". 
> For instance, I can't execute {{INSERT INTO users (id) VALUES (test); INSERT INTO profiles (user_id, name) VALUES (test, 'John');}}
> There's several ways we could solve this, one would be not to return a PDone but just pass through the data so that you can at least chain several Writes.
> Alternatively we could take the Statement string, split on the ";" character if there is one and apply each statement to the either an array of argument setters or the same setter with an additional {{statement_#}} parameter. And then we simply don't commit a batch between these statements.



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