values table expression generating parameters in the row and need customization for database which doesn't support column aliases

[Mohan]

Hi,

I need help in the below to code to generate right select from values with the values I am passing instead of parameters.

Below is the sample code i am trying to execute.

DSLContext dsl;
Settings settings = new Settings()
 .withRenderNameStyle(RenderNameStyle.AS_IS).withRenderFormatted(true);
dsl = DSL.using(SQLDialect.DEFAULT, settings);
String sql = dsl.select().from(DSL.values(DSL.row(43,1234,"value1"),DSL.row(43,1235,"value2"))).getSQL();
System.out.println(sql);

Output is generating as below. 

select 
  v.c1, 
  v.c2, 
  v.c3
from (values
  (?, ?, ?),
  (?, ?, ?)
) v(c1, c2, c3)

So I need help in fixing the above to generate as below because my database doesn't support column aliases

select 

    column1,

    column2,

    column3

from values (43,1234,'value1'),(43,1235,'value2')

Is there any way I can achieve the above format?

Regards,

Mohan

[Lukas Eder]

Hi Mohan,

You chose the SQLDialect.DEFAULT dialect, which is a dialect that can be used for documentation purposes (e.g. when calling toString(), etc.), and usually generates SQL standard compliant SQL, if possible, although there is no such guarantee.

You should replace that dialect by the dialect of your target database, and then jOOQ will either generate the derived column list as you got it already"v(c1, c2, c3)", or it will emulate derived column lists using UNION ALL. This is documented here:

https://blog.jooq.org/2013/01/07/simulating-the-sql-standard/

I hope this helps,

Lukas

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[Mohan]

Hi,

Thanks for the reply. My target database is Snowflake. So which dialect I should use. Also I am using jooq as sql query generator.

[Lukas Eder]

Hi Mohan,

Well, that's a good question :) We don't officially support Snowflake, so it may well be that this particular feature cannot be properly emulated. You could use a dialect like Oracle for this particular query, but then other queries might stop working...

I suggest you don't use the VALUES() clause, but manually write your own SELECT .. UNION ALL SELECT .. UNION ALL SELECT .. derived table.

I hope this helps,

Lukas

2017-11-28 14:39 GMT+01:00 Mohan <ramubt...@gmail.com>:

Hi,

Thanks for the reply. My target database is Snowflake. So which dialect I should use. Also I am using jooq as sql query generator.