mybatis對大量數據的遊標查詢

mapper定義

@Mapper
public interface NewsRepository {

    String simpleQuery="select news.id,news.title,news.keywords," +
            "    news.url,news.author," +
            "    data.content,news.inputtime,news.updatetime " +
            " from news news join news_data data on news.id=data.id";

    /**
     * 使用遊標查詢數據數據
     * @return
     */
  
    @Select(value = simpleQuery +
            " where status=1" +
            " order by news.id asc")
    @Options(fetchSize = Integer.MIN_VALUE)//mysql情況比較特殊，只能這樣設置
    Cursor<News> scrollResult();

}

 

service內使用

Cursor<News> cursor= repository.scrollResult();
Iterator<News> iter= cursor.iterator();
int count=0;
while (iter.hasNext()){
     System.err.println(iter.next().title);
     ..........
}