as modern frameworks have warmed people to the idea of using builder-type patterns and anonymous inner classes for such things

mybatis – MyBatis 3 | SQL语句构建器 http://www.mybatis.org/mybatis-3/zh/statement-builders.html

SqlBuilder 和 SelectBuilder (已经废弃)

在3.2版本之前，我们使用了一点不同的做法，通过实现ThreadLocal变量来掩盖一些导致Java DSL麻烦的语言限制。但这种方式已经废弃了，现代的框架都欢迎人们使用构建器类型和匿名内部类的想法。因此，SelectBuilder 和 SqlBuilder 类都被废弃了。

下面的方法仅仅适用于废弃的SqlBuilder 和 SelectBuilder 类。

mybatis – MyBatis 3 | The SQL BUilder Class http://www.mybatis.org/mybatis-3/statement-builders.html

SqlBuilder and SelectBuilder (DEPRECATED)

Before version 3.2 we took a bit of a different approach, by utilizing a ThreadLocal variable to mask some of the language limitations that make Java DSLs a bit cumbersome. However, this approach is now deprecated, as modern frameworks have warmed people to the idea of using builder-type patterns and anonymous inner classes for such things. Therefore the SelectBuilder and SqlBuilder classes have been deprecated.