Node-postgres-展平查询结果数组

Question

I want to get a array of ids from my database table as a one-dimensional array.

I've used QueryArrayConfig for my query string with the rowMode set to "array". I get my ids correctly, but it returns a two-dimensional array.

            const idQuery: pg.QueryArrayConfig = {
                name: 'get-ids',
                text: 'SELECT id FROM MySchema.SomeTable'
                rowMode: "array"
            };

            pool.query(idQuery).then((result: pg.QueryResult) => {
                console.log(result.rows);
                ...

I get : [ [ 1 ], [ 2 ] ] , but I need [1 , 2] . Or do I need to flatten my array after I get my results?

: If I remove rowMode: array , I get an array of javascript objects : [anonymous { id: 1 }, anonymous { id: 2 }] , which doesn't give me what I need.

Answer 1

If you use a rowMode of 'Array' it will return each row as an individual array as per the docs https://node-postgres.com/features/queries#Query%20config%20object . The default is to return each one as an object, so just remove the rowMode:"array" line and see if that works.

With the object you can use map or the array you can use a simple flatMap on your original results

let results = result.flatMap(row => row); // for the array or array results
let results = result.map(item => item.id); // for the object results