1.6 TinkerPop 3.4简述 A word about TinkerPop 3.4 实用的小精灵（Gremlin图查询语言） 阿岶奇TinkerPop向导 PRACTICAL GREMLIN An Apache TinkerPop Tutorial

阿帕奇TinkerPop 重大的更新，该版本是3.4.0已于2019年的1月发布，随后还有一些小的版本更新。本书中的例子都有在3.4.x这一主版本上测试。做为这些主版本升级所必需的内容，新的例子也已追加。

A major update to Apache TinkerPop, version 3.4.0, was released in January 2019 and a number of point releases followed. The examples in this book have been tested with all releases of the 3.4.x line. New examples have also been added as necessitated by those updates。

 

随着时间的推移，变更历史包括了全部的细节信息。变更历史可以从如下位置找到https://github.com/krlawrence/graph/blob/master/ChangeHistory.md

The change history contains details of everything that has been added over time and can be found at this location: https://github.com/krlawrence/graph/blob/master/ChangeHistory.md

 

支持阿帕奇TinkerPop的图数据库引擎需要花一些时间升级到新的版本，当然验证您所使用的数据库的级别总是个不错的主意。

Graph database engines that support Apache TinkerPop often take a while to move up to new releases and it’s always a good idea to verify the exact level the database you are using supports.

 

Tinker Pop 3.4.x 版本的新增特性和功能列表的详细信息您可以从如下链接查看。https://github.com/apache/tinkerpop/blob/master/CHANGELOG.asciidoc

Full details of all the new features added in the TinkerPop 3.4.x releases can be found at the following link: https://github.com/apache/tinkerpop/blob/master/CHANGELOG.asciidoc

 

每次更新本书，笔者也会相应的增加新特性相关的样例程序到样例代码文件夹中。 当前已经增加的例子包括了嵌套循环的groovy (nested-repeat.groovy), 它说明了使用新的嵌套循环步骤的能力。它们也可从小精灵控制台中加载并运行。

As well as updating the book, I continue incrementally adding coverage of these features to the sample-code folder. Samples currently added include nested-repeat.groovy that demonstrates the use of the new nested repeat step capability. It can be loaded and run from the Gremlin console.