Vertx JDBC client queryWithParams - how to add a list?

Question

I have SQL query with condition currency in ? and I\'m using vertx JDBC client queryWithparams method, which receives query parameters in JsonArray.

Answer 1

The short answer is that you can't add a List as a query parameter with the generic Vertx JDBC client, but since you're using Postgres there is a Postgres-specific library called vertx-pg-client that you can use. I implemented roughly the same query as you did with this code:

List<String> currencies = whatever();
String uri = "your-uri";
String query = "select from table where currency = any($1)";
PgConnection.connect(vertx, uri, connectionResult -> {
    if (connectionResult.failed()) {
        // handle
    } else {
        PgConnection connection = connectionResult.result();
        Tuple params = Tuple.of(currencies);

        doQuery(query, connection, params).setHandler(queryResult -> {
            connection.close();
            msg.reply(queryResult.result());
        });
    }
});

    private Future<String> doQuery(String sql, PgConnection connection, Tuple params) {
        Promise<String> promise = Promise.promise();
        connection.preparedQuery(sql, params, res -> {
            if (res.failed()) {
                // log
                promise.fail(res.cause());
            } else {
                RowSet<Row> rowSet = res.result();
                // do something with the rows and construct a return object (here, a string)
                String result = something;
                promise.complete(result);
            }
        });
        return promise.future();
    }

All credit goes to @tsegismont who helped me with the same question here.

Answer 2

There are two options.

If you want to support multiple databases, you'll have to expand your expression yourself:

"... currency IN (" + String.join(",", Collections.nCopies(currencies.size(), "?")) + ")"

If you support only PostreSQL, you can use ANY operator instead:

WHERE currency = ANY(?)