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Bmob API interface encapsulation supports encrypted transmission, including user management, ACL and role, geographic location, condition query, data association, array, object operation and other mod [...]

mini_bmob #

Bmob API 接口封装,包含加密传输,包含用户管理、ACL和角色、地理位置、条件查询、数据关联、数组、对象操作。

Bmob API interface encapsulation, including encrypted transmission, including user management, ACL and role, geographic location, conditional query, data association, array and object operation.

Usage #

1. 初始化 #

  • 非加密形式

可查看测试代码no_safe_test.dart

  BmobConfig.init(appId,apiKey,masterKey: masterKey,printError: (
object, extra) =>
L.e(object),
printResponse: (
object, extra) =>
L.d(object),
);
  • 加密形式

可查看测试代码safe_test.dart

BmobConfig.initSafe(secretKey,safeToken: '
JsonYe-
'
, // 安全码,详见官方文档
masterKey: masterKey, //masterKey 不必填
printError: (
object, extra) =>
L.e(object), // 访问API时,打印错误信息
printResponse: (
object, extra) =>
L.d(object)); // 访问API时,打印正常请求信息

2. ACL #

ACL 已经集成到基类中,若要启动,直接设置即可。可参考 acl_test.dart

3 创建表对象 #

book.dart为例介绍

3.1 创建[表名]Table类,继承BmobTable

class BookTable extends BmobTable {
}

3.2 实现一个抽象方法 getBmobTabName(),返回bmob数据表中对应的表名称。

  @override
String getBmobTabName() => "book";

3.3 添加自有字段

3.3.1 基本数据类型
/// 数名
String? name;
3.3.2 Pointer数据类型
/// 所属类别
late BmobPointer<CategoryTable> category;
3.3.3 Relation 数据类型
/// 作者
late BmobRelation<BookTable, AuthorTable> author;
3.3.4 DateTime数据类型
/// 出版时间
BmobDateTime? pubDate;

3.4 重写方法,补全解析代码

3.4.1 构造方法

基础数据类型,可直接初始化。对于自定义的数据类型,建议传入基础数据类型,在构造函数中进行初始化。

BookTable({
  this.name,
  DateTime? pubDate,
  List<AuthorTable> author = const [],
  CategoryTable? category,
}) {
  assert(category == null || category.objectId != null);
  assert(
  author.isEmpty || !author.any((element) => element.objectId == null));
  if (pubDate != null) {
    this.pubDate = BmobDateTime(pubDate);
  }
  this.author = BmobRelation(
    this,
    AuthorTable(),
    'author',
        (json) => AuthorTable().fromJson(json),
    author,
  );
  this.category = BmobPointer(category);
}
3.4.2 fromJson 方法

此方法也将用到对象查询中,json转对象,所以需要补全

@override
BookTable fromJson(Map<String, dynamic> json) {
  super.fromJson(json);
  name = json['name'];
  if (json.containsKey('pubdate')) {
    pubDate = BmobDateTime.fromJson(json['pubdate']);
  }
  if (category.subSet == null) {
    category.subSet = CategoryTable()
      ..fromJson(json['category']);
  } else {
    category.fromJson(json['category']);
  }
  author = BmobRelation(
    this,
    AuthorTable(),
    'author',
        (json) => AuthorTable().fromJson(json),
    [],
  );
  return this;
}
3.4.3 createJson 方法

此方法,将用在数据新增、修改时会被调用,自动转换,需要补全

@override
Map<String, dynamic> createJson() => {
  ...super.createJson(), //此处建议包含基类的createJson方法,会自动完成ACL的设置。
  "name": name,
  "pubdate": pubDate?.toJson(),
  "category": category.createJson(),
  "author": author.createJson(),
};
3.4.4 toJson() 方法,可选

此方法,用于将对象进行json化。组件中未引用。所以可结合实际使用需求进行补全。

@override
Map<String, dynamic> createJson() => {
    ...super.createJson(),
    "name": name,
    "pubdate": pubDate?.toJson(),
    "category": category.createJson(),
    "author": author.createJson(),
  };

4 查询 #

4.1 WhereBuilder

用于生成查询语句,包含基础字段查询(包括DateTime类型)、复合查询、关联对象查询、位置查询、分页查询、聚合查询、排序、字段过滤

4.1.1 基础字段查询
BmobWhereBuilder where = BmobWhereBuilder();
where
  .whereBasic<int>('age')
  .lte(100)
  .gte(20)
  .contain([30, 40, 50, 60])
  .unContain([50])
  .ne(30)
  .all([20, 23, 12]);
where
  .whereBasic<DateTime>('birthday')
  .gte(DateTime.parse('2020-10-12 12:10:09'))
  .lte(DateTime(2021, 12, 13, 23, 12, 12));
/// 打印查询语句
L.i(jsonEncode(where.builder()));
4.1.2 复合查询
BmobWhereBuilder where = BmobWhereBuilder();
where.or<double>('width').gte(12.0).lte(34.9);
where.or<double>('width').gte(13.0).lte(34.9);
where.and<double>('height').gte(13.0).lte(34.9);
where.and<double>('height').gte(23.0).lte(44.9);
/// 打印查询语句
L.i(jsonEncode(where.builder()));
4.1.3 关联对象查询

关联对象,直接调用其include方法即可

/// Relation 对象
await book.category.include();
/// Pointer 对象
await book.author.include();
4.1.4 位置查询

TODO: or和and的复合查询,未测试过,不知是否可行

BmobWhereBuilder geo = BmobWhereBuilder();
// 基本查询
geo
    .whereGeoPoint('location', BmobGeoPoint(37.423112, 114.123412))
    .maxDistanceInKilometers(1000);

// or复合查询
geo
    .orGeoPoint('location', BmobGeoPoint(37.423112, 114.123412))
    .maxDistanceInKilometers(1000);

// and 复合查询
geo
    .andGeoPoint('location', BmobGeoPoint(37.123421, 114.124412))
    .maxDistanceInKilometers(1000);
/// 打印查询语句
L.i(jsonEncode(geo.builder()));
4.1.5 分页查询

pageIndex 从1开始。小于1的会自动转化成1

BmobWhereBuilder where = BmobWhereBuilder();
where.page(1,20); // 页码、每页数量。
/// 打印查询语句
L.i(jsonEncode(where.builder()));
4.1.6 聚合查询

支持常见的 max、min、sum、average、groupBy。支持聚合后的筛选having

BmobWhereBuilder agr = BmobWhereBuilder();
agr.max(['age', 'height'])
  .min(['age', 'height'])
  .average(['age', 'height'])
  .sum(['age'])
  .groupBy(fields: ['sex'], groupCount: true); // 分组字段,是否对分组进行统计
L.i(agr.builder());
4.1.7 排序

支持多字段排序,升序直接写字段名称,降序在字段名称前加-,也支持聚合查询后的字段排序。

BmobWhereBuilder where = BmobWhereBuilder();
where.order(['name','-age']);
/// 打印查询语句
L.i(jsonEncode(where.builder()));
4.1.8 字段过滤
BmobWhereBuilder where = BmobWhereBuilder();
where.keys(['name','age']);
/// 打印查询语句
L.i(jsonEncode(where.builder()));
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Bmob API interface encapsulation supports encrypted transmission, including user management, ACL and role, geographic location, condition query, data association, array, object operation and other module functions

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License

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Dependencies

crypto, flutter, mini_net, uuid

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