public static Object tempid() {

return Peer.tempid(":db.part/user");

}

public static void main(String[] args) throws IOException {

Connection conn = scratchConnection();

URL url = resource("datomic-java-examples/social-news.edn");

transactAll(conn, new InputStreamReader(url.openStream()));

// tx data is plain lists and maps

conn.transact(

list(map(":db/id", tempid(), ":user/firstName", "Stewart", ":user/lastName", "Brand"),

map(":db/id", tempid(), ":user/firstName", "Stuart", ":user/lastName", "Smalley"),

map(":db/id", tempid(), ":user/firstName", "John", ":user/lastName", "Stewart")));

Database db = conn.db();

// Find all Stewart first names (should return 1 tuple)

System.out.println(q("[:find ?e :in $ ?name :where [?e :user/firstName ?name]]", db, "Stewart"));

// Find all Stewart or Stuart first names (should return 2 tuples)

List names = list("Stewart", "Stuart");

System.out.println(q("[:find ?e :in $ [?name ...] :where [?e :user/firstName ?name]]", db, names));

// Find all [Stewart|Stuart] [first|last] names (should return 3 tuples)

List nameAttributes = list(read(":user/firstName"), read(":user/lastName"));

System.out.println(q("[:find ?e :in $ [?name ...] [?attr ...] :where [?e ?attr ?name]]", db, names, nameAttributes));

// Build a query out of data. You might need this if e.g. writing a query optimizer.

// Do *not* do this if parameterizing inputs (as shown above) is sufficient!

List firstNameQuery = list(read(":find"), read("?e"),

read(":in"), read("$"), read("?name"),

read(":where"), list(read("?e"), read(":user/firstName"), read("?name")));

// Find all Stewart first names (should return 1 tuple)

System.out.println(q(firstNameQuery, db, "Stewart"));

}