Java QueryWrapper groupBy自定义字段，以及List＜Map＞转List＜Entity＞

Java queryWrapper groupby自定义字段

String sql = "data_id,(select value from lz_html a where a.data_id = lz_html.data_id and class_name='test-item-status') status," +
 "(select value from lz_html a where a.data_id = lz_html.data_id and class_name='test-item-duty-person') dutyPerson," +
"(select value from lz_html a where a.data_id = lz_html.data_id and class_name='test-item-tag') tag," +
"(select value from lz_html a where a.data_id = lz_html.data_id and class_name='test-item-level') level," +
"(select value from lz_html a where a.data_id = lz_html.data_id and class_name='test-item-verno') verNo";
queryWrapper.select(sql);
queryWrapper.groupBy("data_id"); // 根据group字段进行分组

List<Map>转List<Entity>

List<TestItemModel> newList = JSON.parseObject(JSON.toJSONString(resultList), new TypeReference<List<TestItemModel>>() {});

连在一起看 

QueryWrapper<LzHtml> queryWrapper = new QueryWrapper<>();
queryWrapper.eq("file_id", filter.getFileId());
queryWrapper.in("data_id", datas);
 String sql = "data_id,(select value from lz_html a where a.data_id = lz_html.data_id and class_name='test-item-status') status," +
 "(select value from lz_html a where a.data_id = lz_html.data_id and class_name='test-item-duty-person') dutyPerson," +
 "(select value from lz_html a where a.data_id = lz_html.data_id and class_name='test-item-tag') tag," +
 "(select value from lz_html a where a.data_id = lz_html.data_id and class_name='test-item-level') level," +
 "(select value from lz_html a where a.data_id = lz_html.data_id and class_name='test-item-verno') verNo";
queryWrapper.select(sql);
queryWrapper.groupBy("data_id"); // 根据group字段进行分组
List<Map<String, Object>> resultList = lzHtmlService.listMaps(queryWrapper);
//List<Map>转List<Entity>
List<TestItemModel> newList = JSON.parseObject(JSON.toJSONString(resultList), new TypeReference<List<TestItemModel>>() {});

原文地址：https://blog.csdn.net/gdgztt/article/details/145018791

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