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                # DB普通查詢 普通查詢只用數據表加上where語句即可查詢出想要的數據集合;一般多表聯合查詢也適合用普通查詢 條件查詢方法 查詢一個數據使用 ```javascript RowData rowData = Db.name("user").where("id", 1).find();//name必須指定表名(設置了數據表前綴參數的話使用) ``` 查詢集合List使用 ```java List<RowData> select_list = Db.name("user").where("status",1).select(); ``` 支持聯合查詢(語法類型跟tp5類似,只是用.來連接串起來) ```java List<RowData> select_list = Db.name("user").where("status",1).field("id,name").limit(2).order("id desc").select(); ``` 查詢使用whereData賦值 ```java WhereData where_data = new WhereData(); where_data.put("product_id",1); where_data.put("status",1); List<RowData> select = Db.name("dt_record_ext").where(where_data).order("id desc").limit(1, 2).select(); ``` 查詢結果使用字段值做為鍵值 ```java WhereData where_data = new WhereData(); where_data.put("product_id",1); where_data.put("status",1); List<RowData> select = Db.name("dt_record_ext").where(where_data).order("id desc").limit(1, 2).selectForMap();//如果不傳鍵值則默認是id做為鍵值 ``` 運行結果 ```java { "code": 1, "msg": "success", "data": { "1": { "id": "1", "title": "1", "yxtag_id": "3", "finish_time": "1", "status": "1" }, "2": { "id": "2", "title": "任務1", "yxtag_id": "3", "finish_time": "0", "status": "1" } } } ```
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