译文/Translated：
我们很高兴能向大家介绍EOSIO 2.2发行候选版，这个版本支持开发者和行业的现有需求。新功能的设计宗旨是解决组合性、节约时间、给应用开发者更多的资源管理选择、对私人网络的数据访问权限进行更精细化的管理。
EOSIO 2.2发行候选版
EOSIO2.2发行候选版反映了EOSIO社区的想法。它由三个独立的功能组成，这三个功能关注开发者可用性、资源管理、以及数据访问更大的控制。
只读查询
区块链开发者经常需要把状态数据提供给外部进程使用。在本版本之前，通过get_tables API访问仅限于直接存储在DB或KV表中的数据，但这个机制要求高、效率低。
现在开发者可以利用这个本地功能把数据提供给外部进程，利用新的机制支持更复杂的请求。
只读查询可以：
- 让开发者利用来自相同块高度的表数本地执行复杂的跨表查询。
- 让开发者能够在智能合约中有逻辑地使用耦合读写代码，简化代码管理。
- 让开发者在交易发送之前先了解交易会产生的后果。
资源付款方
目前应用终端用户在EOSIO公网上支付交易费用，因此应用开发者就不容易吸引新用户。现有功能ONLY_BILL_FIRST_AUTHORIZER对开发者和终端用户都太复杂。
所以我们希望能让开发者在EOSIO公链上能够更轻松地搭建应用、获得更多用户。我们相信让开发者更容易支付用户交易费用就能给EOSIO上发展的社区带来巨大的优势。这个功能为EOSIO智能合约开发者提供了简单、安全的方法，指定资源提供者、为交易设置资源限制、免除用户的资源成本费用。
网络访问控制
针对想和区块链基础架构集成的行业来说，很明显有必要推出一个数据隐私解决方案。为了更好地理解如何在EOSIO上设计数据隐私解决方案，我们启动了EOSIO数据隐私工作小组，期目的是研究、提出、创新区块链隐私解决方案。
我们在迭代开发解决方案，网络访问控制功能是处理数据隐私工作小组发现的核心用例的第一步。该功能让区块链管理员组成隐私小组、确保只有被授权方才能加入网络或访问数据。其设计目的是要减少元素据泄露、同时维护记录的不可变性。
系统架构师可以利用该功能增加或通过修改特权智能合约来添加或撤消访问，同时，从隐私小组成员发起的所有链接都通过TLS加密，用最好的方式保护敏感信息。
我们会继续投入开发功能，让我们的平台更容易访问和使用，让每个人—不管独立开发师和初创企业还是成熟企业—都能在EOSIO上构建项目。
联系我们
我们鼓励开发者测试EOSIO 2.2发行候选版的其它功能，并向我们提供反馈。如果您想给EOSIO 2.2发行候选版提供反馈、和我们的团队更紧密地合作，为开发者改进EOSIO，你可以在block.one和我们的开发者关系小组联系。
原文/Original：
We are excited to introduce the EOSIO 2.2 release candidate, that supports the ongoing needs of developers and industries alike. The new features are designed to address composability and save time, offer application developers a wider range of resource management options, and provide more finely tuned control over data access privileges for private networks.
EOSIO 2.2 Release Candidate
The聽EOSIO 2.2 release candidate聽reflects input from the EOSIO community. It comprises three separate features, each specifically focused on developer usability, resource management, and greater control over data access.
Read-Only Queries
Blockchain developers must often make state data available to external processes. Prior to this release, access was limited to data directly stored in the DB or KV tables via the get_tables API, a mechanism which is exacting and inefficient.
Developers can now use this native feature to make data accessible to external processes, and utilize a new mechanism that supports more complex queries.
Read-Only Queries will:
- Enable developers to perform complex cross-table queries natively with table data from the same block height.
- Allow developers to logically couple the read and write code in their smart contract and simplify code management.聽
- Give developers insight regarding the consequences of a transaction before it is sent.
Resource Payer
Application end-users currently pay the costs for transacting on EOSIO public networks, making it difficult for application developers to onboard new users. The existing workaround, ONLY_BILL_FIRST_AUTHORIZER, complicates the experience for both developers and end users.
It is our desire to make it easier for developers building applications on EOSIO-based public networks to reach a wider audience. We believe providing developers an easier means to pay user transaction costs will offer a significant advantage to those growing communities on EOSIO. This feature provides a simple, secure way for EOSIO smart contract developers to designate a resource provider, set resource limits for a transaction, and enable users to transact without having to pay for resource costs.
Network Access Control
There is a demonstrable necessity for a widely supported data privacy solution for industries seeking to integrate with blockchain-based infrastructures. To better understand how to best architect a data privacy solution on EOSIO, we launched the EOSIO Data Privacy Working Group, the objective of which is to research, propose, and innovate blockchain-based privacy solutions.
We are iteratively developing solutions, and the Network Access Control feature represents the initial steps toward addressing a core use case identified by the data privacy working group. The feature allows blockchain administrators to form privacy groups and ensure that only authorized parties can join the network or access data. It is designed to reduce any metadata leaks while maintaining the immutability of records.
System architects can use this feature to add or revoke access via modifications to a privileged smart contract, and all connections from privacy group members are encrypted using TLS to follow best practices in protecting sensitive information.
We will continue to invest in features that make our platform more accessible, usable, and that make it easier for everyone from independent developers and startups to established organizations to build on EOSIO.
Stay Connected
We encourage developers to test the additional features in the EOSIO 2.2 release candidate, and provide us with feedback. If you would like to offer feedback on the release candidate of EOSIO 2.2 and work more closely with our team to improve EOSIO for developers, you can contact our developer relations team at developers[at]block.one.
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