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嗨,我们使用带有 ORMLite 和 SpringAndroidSpiceRequest 的 RoboSpice 从网页读取 JSON 信息并写入 SQLite 数据库。

我们正在使用最新的 JSON 映射器 MappingJackson2HttpMessageConverter。

        // Web services support JSON responses
        MappingJackson2HttpMessageConverter jsonConverter = new  MappingJackson2HttpMessageConverter();
        FormHttpMessageConverter formHttpMessageConverter = new FormHttpMessageConverter();
        StringHttpMessageConverter stringHttpMessageConverter = new StringHttpMessageConverter();
        final List<HttpMessageConverter<?>> listHttpMessageConverters = restTemplate.getMessageConverters();

我们已经尝试像下面的例子那样读取嵌套的 JSON 查询,我们可以读取并存储到数据库,JSON 的第一级(页面,总数),但我们不能存储 JSON 数组的下一层,所有的“schedule_date "条目。

我们已经将这个示例(以及更多示例)视为存储 JSON 数据的最佳示例。但这对我们不起作用。RoboSpice 使用 OrmLite 持久化 JSON 数组

问题:我们如何读取和写入嵌套的 JSON 键和值,我们很难过!:O

JSON:

{
   "page": 2,
   "total": 5,
   "result":
   [
       {
           "schedule_date": "2013-08-03"
       },
       {
           "schedule_date": "2013-09-03"
       },
       {
           "schedule_date": "2013-10-03"
       },
       {
           "schedule_date": "2013-11-03"
       },
       {
           "schedule_date": "2013-12-03"
       }
   ]
}

广播结果.java:

            import java.util.Collection;
            import java.util.List;
            import com.j256.ormlite.field.DatabaseField;
            import com.j256.ormlite.table.DatabaseTable;
            import com.j256.ormlite.field.ForeignCollectionField;
            import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

            @JsonIgnoreProperties(ignoreUnknown = true)
            @DatabaseTable(tableName="BroadcastResult")
            public class BroadcastResult {

                @DatabaseField(id = true)
                private int page;

                @DatabaseField
                private int total;

                @ForeignCollectionField(eager = false)
                private Collection<Broadcast> result;

                public int getPage() {
                    return page;
                }

                public void setPage(int page) {
                    this.page = page;
                }

                public int getTotal() {
                    return total;
                }

                public void setTotal(int total) {
                    this.total = total;
                }

                public Collection<Broadcast> getResult() {
                    return result;
                }

                public void setResult(Collection<Broadcast> result) {
                    this.result = result;
                }
            }

广播.java:

            import com.j256.ormlite.field.DatabaseField;
            import com.j256.ormlite.table.DatabaseTable;
            import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

            @JsonIgnoreProperties(ignoreUnknown = true)
            @DatabaseTable(tableName="Broadcast")
            public class Broadcast {

                @DatabaseField(id = true)
                private String schedule_date;

                @DatabaseField(foreign = true)
                private BroadcastResult result;

                public String getScheduleDate() {
                    return schedule_date;
                }

                public void setScheduleDate(String schedule_date) {
                    this.schedule_date = schedule_date;
                }

                public void setBroadcastResult(BroadcastResult result) {
                    this.result = result;
                }

                public BroadcastResult getBroadcastResult() {
                    return result;
                }   
            }

我们得到了这个错误,我们不明白。
Logcat:SQLiteLog(10637):(1)没有这样的列:result_id

@DatabaseField(foreign = true) // also tried (foreign = true, ColumnName="result")
private BroadcastResult result;

运行测试的完整日志可以在这里看到: https ://gist.github.com/anonymous/7760344

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1 回答 1

0

您是否尝试过添加

@DatabaseField(generatedId = true)
private int _id;

到你的 Broadcast.java 类?

于 2014-09-20T05:19:19.400 回答