MyModel.js

exports.definition = {

  config: {
    columns: {
      // ...
    },
    adapter: {
      type:            "sql",
      collection_name: "MyModels"
    }
  },

  extendCollection: function(Collection) {

    Collection.prototype.destroyAll = function(opt) {
      var db = Ti.Database.open(this.config.adapter.db_name);
      db.execute("DELETE FROM " + this.config.adapter.collection_name);
      db.close();
      this.models = [];
      if (!opt || !opt.silent) { this.trigger("reset"); }
      return this;
    };

    Collection.prototype.saveAll = function(opt) {
      var util    = require("alloy/sync/util");
      var dbName  = this.config.adapter.db_name;
      var table   = this.config.adapter.collection_name;
      var columns = this.config.columns;
      var db      = Ti.Database.open(dbName);

      db.execute("BEGIN;");

      this.forEach(function (model) {
        if (!model.id) {
          model.id = util.guid();
          model.attributes[model.idAttribute ] = model.id;
        }
        var names = [], values = [], q = [];
        for (var k in columns) {
          names.push(k);
          values.push(model.get(k));
          q.push("?");
        }
        var sqlInsert = "INSERT INTO " + table + " (" + names.join(",") + ") VALUES (" + q.join(",") + ");";

        db.execute(sqlInsert, values);
      });

      db.execute("COMMIT;");
      db.close();

      if (!opt || !opt.silent) { this.trigger("reset"); }
      return this;
    };

    Collection.prototype.refreshFromData = function refreshFromData(data) {
      this.destroyAll({silent:true});
      this.reset(data, {silent:true});
      this.saveAll({silent: true});
      this.trigger("fetch");
    };

  }

};