node-postgres: how to execute “WHERE col IN ()” query?

Question

I\'m trying to execute a query like this:

SELECT * FROM table WHERE id IN (1,2,3,4)

The problem is that the list of ids I want to filter ag

Answer 1

We've seen this question before on the github issues list. The correct way is to dynamically generate your list of parameters based on the array. Something like this:

var arr = [1, 2, "hello"];
var params = [];
for(var i = 1; i <= arr.length; i++) {
  params.push('$' + i);
}
var queryText = 'SELECT id FROM my_table WHERE something IN (' + params.join(',') + ')';
client.query(queryText, arr, function(err, cb) {
 ...
});

That way you get the postgres parameterized escaping.