结构化查询语言(Structured Query Language,SQL)：一种标准化语言，用于在关系数据库中定义对象及操纵数据。
Structured Query language (SQL) : a standardized language used to define objects and manipulate data in a relational database.
JPA提供了标准映射定义(通过Annotation或XML)和标准运行时api及对象级查询语言(JPQL)。
JPA provides both a standard mapping definition (through annotations or XML) and a standard runtime API and object-level query language (JPQL).
在本部分，我们将举例说明如何利用XPath查询历史事件以及如何定义事件组及如何通过EventAccess接口来使用事件组。
In this section, we illustrate how to query the historical events using the XPath and how to define the event groups and use them with the event Access interface.
以数据记录指针的定位及查询功能的实现为例，详细介绍了使用类设计器将系统控件组合成用户定义控件的方法。
Introduce a way to merge several system controls into a custom control with class designer by the example of implementing record Pointers locating and query function.
探索加密狗保护软件时的接入、调用及数据存取方式，研究加密狗内自定义算法的查询式认证与交互性认证方式对软件安全的影响。
Explore dongle protected software access, call and data access methods to study the dongle query the custom authentication algorithm and authentication interactive software security.
探索加密狗保护软件时的接入、调用及数据存取方式，研究加密狗内自定义算法的查询式认证与交互性认证方式对软件安全的影响。
Explore dongle protected software access, call and data access methods to study the dongle query the custom authentication algorithm and authentication interactive software security.
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