查询数据:
Uri uri = Uri.parse("dataability:///com.example.MyDataAbility");
DataAbilityPredicates predicates = new DataAbilityPredicates();
predicates.equalTo("columnName", "value");
DataAbilityHelper dataAbilityHelper = DataAbilityHelper.creator(context, uri);
ResultSet resultSet = dataAbilityHelper.query(uri, null, predicates);
while (resultSet.goToNextRow()) {
// 处理查询结果
String data = resultSet.getString(resultSet.getColumnIndexForName("columnName"));
}
resultSet.close();
插入数据:
Uri uri = Uri.parse("dataability:///com.example.MyDataAbility");
ValuesBucket valuesBucket = new ValuesBucket();
valuesBucket.putString("columnName", "value");
DataAbilityHelper dataAbilityHelper = DataAbilityHelper.creator(context, uri);
int result = dataAbilityHelper.insert(uri, valuesBucket);
更新数据:
Uri uri = Uri.parse("dataability:///com.example.MyDataAbility");
ValuesBucket valuesBucket = new ValuesBucket();
valuesBucket.putString("columnName", "new value");
DataAbilityPredicates predicates = new DataAbilityPredicates();
predicates.equalTo("columnName", "old value");
DataAbilityHelper dataAbilityHelper = DataAbilityHelper.creator(context, uri);
int result = dataAbilityHelper.update(uri, valuesBucket, predicates);
删除数据:
Uri uri = Uri.parse("dataability:///com.example.MyDataAbility");
DataAbilityPredicates predicates = new DataAbilityPredicates();
predicates.equalTo("columnName", "value");
DataAbilityHelper dataAbilityHelper = DataAbilityHelper.creator(context, uri);
int result = dataAbilityHelper.delete(uri, predicates);
请注意,上述代码中的 "com.example.MyDataAbility" 应该替换为你实际注册的 Data Ability 的能力名称。这些示例代码是基本框架,具体的实现会根据你的数据模型和业务逻辑而有所不同。在实际开发中,还需要处理异常情况、数据权限等问题,具体的细节可以查阅鸿蒙OS的官方文档和示例代码。
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