Question

I’m using the QueryBuilder to construct the inner SQL that later is used in a raw SQL to avoid escaping invalid characters manually.

SelectArg friendsIN = new SelectArg(friendsUsernames);
QueryBuilder<MyObject, Integer> qb = myObjectDao.queryBuilder();
qb.selectRaw("username", "MAX(time) AS latestTime").groupBy("username").where()
    .in("username", friendsIN);
String innerSelect = pq.getStatement();

friendsUsernames is defined as ArrayList<String>.

Then I use the innerSelect to build the outer select:

String select = "SELECT w.id FROM (" + innerSelect +") AS x INNER JOIN myObject AS w on w.username = x.username AND w.time = x.latestTime";
GenericRawResults<String[]> results = myObjectDao.queryRaw(select);

But, as expected, the innerString has '?' and when I call queryRaw on myObjectDao I don’t get any result. I tried to give friendsUsername as an array to queryRaw:

GenericRawResults<String[]> results =
    myObjectrDao.queryRaw(select,
         friendsUsernames.toArray(new String[friendsUsernames.size()]));

But I get the following error:

android.database.sqlite.SQLiteBindOrColumnIndexOutOfRangeException:
      bind or column index out of range: handle 0x17a22e8

Any suggestions on how to accomplish this kind of queries with OrmLite?

Answer 1

Yeah that’s not going to work. There is only one ? in your query and yet you are trying to pass in an array of user-names. There must be a 1-to-1 correspondence between the number of ? SQL arguments and the number of arguments passed to the queryRaw(...) method exactly.

If the friendsUsernames is a fixed size then you should be able to do something like the following which will generate SQL something like "in (?, ?, ?, ?)":

List<SelectArg> friendsInList = new ArrayList<SelectArg>();
for (int i = 0; i < NUM_FRIENDS; i++) {
   // it doesn't matter what the value is since you just want the ?
   fieldsInList.add(new SelectArg());
}
...in("name", friendsInList);

However if the list of names is dynamic then you are going to have to do this on the fly since, again, the number of ? must match the number of arguments passed to the queryRaw(...) method exactly.