Question

哪种方式更好？

内部循环的一个事务

public void saveProducts(List<Product> products) {

    Realm realm = Realm.getDefaultInstance();
    realm.executeTransaction(realm1 -> {

        for (Product product : products) {
            Number currentIdNum = realm1.where(Product.class).max("id");
            long nextId;
            if (currentIdNum == null) {
                nextId = 1;
            } else {
                nextId = currentIdNum.longValue() + 1;
            }

            String code = product.getCategory().getCode();
            Category code1 = realm.where(Category.class).equalTo("code", code).findFirst();
            if (code1 == null) {
                Category category = realm.copyToRealmOrUpdate(product.getCategory());
                product.setCategory(category);
            } else {
                product.setCategory(code1);
            }
            product.setId(nextId);
            realm1.insertOrUpdate(product); // using insert API
        }
    });
    realm.close();
}

每个元素的事务循环？

public void saveProducts(List<Product> products) {

    Realm realm = Realm.getDefaultInstance();
    for (Product product : products) {
        realm.executeTransaction(realm1 -> {
            Number currentIdNum = realm1.where(Product.class).max("id");
            long nextId;
            if (currentIdNum == null) {
                nextId = 1;
            } else {
                nextId = currentIdNum.longValue() + 1;
            }

            String code = product.getCategory().getCode();
            Category code1 = realm.where(Category.class).equalTo("code", code).findFirst();
            if (code1 == null) {
                Category category = realm.copyToRealmOrUpdate(product.getCategory());
                product.setCategory(category);
            } else {
                product.setCategory(code1);
            }
            product.setId(nextId);
            realm1.insertOrUpdate(product); // using insert API

        });
    }
    realm.close();
}

还是另一种方式？如果你知道怎么做得更好，请说。

Answer 1

<tr ng-repeat="question in questionnaireData track by $index">

    <td><span class="showDot">{{question.QuestionItem}}</span></td>
    <td>
        <div class="" >

            <select ng-if="question.MasterDataCategoryId != null"
                    id="{{question.QuestionId}}"
                    ng-model="question[$index]" class="form-control"
                    ng-click="getAnswersDetails(question)">
                <option selected="selected"></option>
                <option ng-repeat="answer in answerData"
                        value="{{answer.MasterData}}">
                   {{answer.MasterData}}
                </option>

            </select>

            <input ng-if="question.MasterDataCategoryId == null"
                   id="{{question.QuestionId}}"
                   ng-model="MasterDataCategoryId[$index].QuestionId"
                   type="text" name="question.QuestionId"
                   class="form-control">

        </div>

这个更糟糕。

首选单笔交易。

Answer 2

由于您正在处理Realm Proxy对象，因此您可以遵循此方法。

 public void saveProducts(List<Product> products) {

    Realm realm = Realm.getDefaultInstance();
        realm.beginTransaction();


    for (Product product : products) {


        Number currentIdNum = realm1.where(Product.class).max("id");
        long nextId;
        if (currentIdNum == null) {
            nextId = 1;
        } else {
            nextId = currentIdNum.longValue() + 1;
        }

        String code = product.getCategory().getCode();
        Category code1 = realm.where(Category.class).equalTo("code", code).findFirst();
        if (code1 == null) {
            Category category = realm.copyToRealmOrUpdate(product.getCategory());
            product.setCategory(category);
        } else {
            product.setCategory(code1);
        }
        product.setId(nextId);
        realm.insertOrUpdate(product); // using insert API



    }
    realm.commitTransaction();

    realm.close();
}

一个事务中的域循环VS每个stepin循环的一个事务

2 个答案: