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KPCKevin Powell - Community DTDrizzle Team

•Created by ccabd on 8/9/2023 in #help

How to specify type using sql template

I'm using this piece of code

const ids = [ 3445, 3446, 999 ];
const values = sql.join( ids.map( v => sql`(${v})` ), sql`,` );

const query = sql.empty();
query.append( sql`SELECT * FROM ( VALUES ` );
query.append( values );
query.append( sql` ) AS temp(id)` );
query.append( sql` WHERE NOT EXISTS (` );
query.append( sql` SELECT * FROM ${mytable} WHERE ${mytable.id} = CAST( temp.id AS integer )` );
query.append( sql` )` );

const result = await database.execute( query );

const ids = [ 3445, 3446, 999 ];
const values = sql.join( ids.map( v => sql`(${v})` ), sql`,` );

const query = sql.empty();
query.append( sql`SELECT * FROM ( VALUES ` );
query.append( values );
query.append( sql` ) AS temp(id)` );
query.append( sql` WHERE NOT EXISTS (` );
query.append( sql` SELECT * FROM ${mytable} WHERE ${mytable.id} = CAST( temp.id AS integer )` );
query.append( sql` )` );

const result = await database.execute( query );

to create a query like this

{
  query: 'SELECT * FROM ( VALUES ($1),($2),($3) ) AS temp(id) WHERE NOT EXISTS ( SELECT * FROM "mytable" WHERE "mytable"."id" = CAST( temp.id AS integer ) )',
  params: [ 3445, 3446, 999 ]
}

{
  query: 'SELECT * FROM ( VALUES ($1),($2),($3) ) AS temp(id) WHERE NOT EXISTS ( SELECT * FROM "mytable" WHERE "mytable"."id" = CAST( temp.id AS integer ) )',
  params: [ 3445, 3446, 999 ]
}

There is a few problems with it, I guess because this is a parameterized query and parameters are used as literals (need confirmation on this)? 1. I have to cast temp.id to integer in each subquery, otherwise I get PostgresError: operator does not exist: integer = text. I don't know how that affects performance, but it feels dirty. 2. The query results are of type string, which I then have to cast again. 3. Also, since the whole query is of type SQL<unknown>, when parsing the result I need to force the wrong/unwanted type string onto the typescript compiler first, just to be able to cast the value, like this result.map( v => +(v.id as string) ) Is this really the most optimal way of doing things here, or am I missing something? I found a param method in drizzle but no docs and no idea how to use it or if it could be useful anyhow. Please enlighten me.

5 replies

DTDrizzle Team

•Created by ccabd on 8/8/2023 in #help

Find IDs from a list which do not exist in table

As the title says, i'm trying to filter a list of given IDs (could be hundreds) into a list of IDs that do not exist in a table (could have multiple thousands of rows). My research suggests that I should be doing something like this:

select *
from ( 
   values (1),(2),(3)
) as temp(id)
where not exists (select *
                  from mytable
                  where mytable.id = temp.id);

select *
from ( 
   values (1),(2),(3)
) as temp(id)
where not exists (select *
                  from mytable
                  where mytable.id = temp.id);

Would you agree and more importantly, can I do this using ORM syntax? Thanks for any tips or insights you can provide.

4 replies

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