Question

我有一个值列表，该值列表在模型内部。如何一次性将这些数据保存在数据库中？我创建了一个模型类并转换为JSON，并尝试保存数据但显示异常未处理的异常：

DatabaseException（java.util.HashMap无法强制转换为 java.lang.Integer）

Future<VendorEventCommitListModel> saveVendorEventCommitList(VendorEventCommitListModel vendorEventCommitList) async {
    var dbClient = await db;
    // this will insert the Album object to the DB after converting it to a json
   // int res = await dbClient.rawInsert('INSERT INTO vendor_event_commit_list() VALUES(?,?,?,?,?,?,?,?,?,?)', [userDetailsDBModel.getName,userDetailsDBModel.getEmail,userDetailsDBModel.getUsertype,userDetailsDBModel.getPhone1,userDetailsDBModel.getPhone2,userDetailsDBModel.getGrnder,userDetailsDBModel.getAddress,userDetailsDBModel.getCity,userDetailsDBModel.getState,userDetailsDBModel.getCountry]);
    vendorEventCommitList.eventId = await dbClient.insert('vendor_event_commit_list', vendorEventCommitList.toJson());
    return vendorEventCommitList;
  }

映射器模型看起来像

Map<String, dynamic> toJson() => {
    "eventId": eventId,
    "venderEmail": venderEmail,
    "username": username,
    "date": date,
    "eventDateTime": eventDateTime,
    "eventName": eventName,
    "utensils": utensils,
    "hotServe": hotServe,
    "carting": carting,
    "eventAddress": eventAddress,
    "remarks": remarks,
    "Vgccourse": List<dynamic>.from(Vgstr.map((x) => x.toJson())),
    "Vgstr": List<dynamic>.from(Vgstr.map((x) => x.toJson())),
}

下面是api响应。

[{
            "event_id": 2,
            "Vender_Email": null,
            "username": "neenabastin@gmail.com",
            "date": "2019-12-06T11:38:19.7681942+05:30",
            "Event_date_time": "2019-11-06T12:18:35.943",
            "Event_name": "Marriage",
            "Utensils": 0,
            "Hot_serve": 0,
            "Carting": 0,
            "Event_Address": "",
            "Remarks": "",
            "itemdetails": null,
            "Vgccourse": [
                {
                    "Vgccourseitem": "Appam",
                    "Vgccoursecount": 67
                },
                {
                    "Vgccourseitem": "Appam",
                    "Vgccoursecount": 67
                }
            ],
            "Vgstr": [
                {
                    "Vgstritem": "item",
                    "Vgstr_count": 56
                },
                 {
                    "Vgstritem": "item",
                    "Vgstr_count": 56
                },
            ]
    },
    {
            "event_id": 2,
            "Vender_Email": null,
            "username": "neenabastin@gmail.com",
            "date": "2019-12-06T11:38:19.7681942+05:30",
            "Event_date_time": "2019-11-06T12:18:35.943",
            "Event_name": "Marriage",
            "Utensils": 0,
            "Hot_serve": 0,
            "Carting": 0,
            "Event_Address": "",
            "Remarks": "",
            "itemdetails": null,
            "Vgccourse": [
                {
                    "Vgccourseitem": "Appam",
                    "Vgccoursecount": 67
                },
                {
                    "Vgccourseitem": "Appam",
                    "Vgccoursecount": 67
                }
            ],
            "Vgstr": [
                {
                    "Vgstritem": "item",
                    "Vgstr_count": 56
                },
                 {
                    "Vgstritem": "item",
                    "Vgstr_count": 56
                },
            ]
    }
]

Answer 1

您可以轻松地将列表另存为JSON对象字符串，或者必须创建主明细表

在flutter中将嵌套列表保存到数据库中

1 个答案: