Trying write a query with ORMLite?

问题

I'm trying write a query using ORMLite. I need this query check a id of custommer in other entity. How could I do it ?

Entities

@DatabaseTable(tableName = "custommer")
public class Custommer{

      @DatabaseField(generatedId = true)
      private Integer id;

      @DatabaseField
      private String name;

      @DatabaseField
      private Sale sale;

      //gets sets
}

@DatabaseTable(tableName = "sale")
public class Sale{

      @DatabaseField(generatedId = true)
      private Integer id;

      @DatabaseField
      private Custommer custommer;

      @DatabaseField
      private Integer status;

      //gets sets
}

Query

Custommer custommer = new Custommer();
custommer.setId(1);
custommer.setName("Fernando Paiva");

QueryBuilder<Sale, Integer> qb = saleDAO.queryBuilder();
            Where where = qb.where();
            where.eq("sale.custommer.id", custommer.getId());
            where.and();
            where.eq("sale.status", 1);
            PreparedQuery<Sale> pq = qb.prepare();
            List<Sale> list = saleDAO.query(pq);
            Log.i("SALE LIST->", list.size() + "");

回答1:

You need to use JOIN

Here your example using Join:

First of all, you need a QueryBuilder to each Dao.
You can apply your filter to each QueryBuilder separately
Last but not least, you join the main QueryBuilder (Sales) with the Custommer's QueryBuilder and
perform the query.

Here the code

Dao<Sale, Integer> saleDao = DaoManager.createDao(getConnectionSource(), Sale.class);
Dao<Custommer, Integer> custommerDao = DaoManager.createDao(getConnectionSource(), Custommer.class);

QueryBuilder<Sale, Integer> saleQa= saleDao.queryBuilder();
saleQa.where().eq("status", 1);
QueryBuilder<Custommer, Integer> custommerQa = custommerDao.queryBuilder();
custommerQa.where().idEq(custommer.getId());

sales = saleQa.join(custommerQa).query();

回答2:

Are you trying to use OrmLite to check if the customer id is the same as the sale id and get all of the matching result? If so the below code will do that

qb.where().eq("id", custommer.id);
List<Sale> results = saleDAO.query(qb.prepare());

Update:

After rereading your question I realized what you're trying to do

qb.where().in(Sale.custommer, id);

See this question for further details. Ormlite Foreign Entity Searching

来源：https://stackoverflow.com/questions/29033931/trying-write-a-query-with-ormlite

标签

android

sqlite

ormlite