DM4过程SQL语言的设计与实现  

Design and implementation of procedural SQL language in DM4

作　　者：谢美意[1] 冯玉才[1] 

机构地区：[1]华中科技大学计算机科学与技术学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2006年第3期14-16,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家高科技研究发展计划资助项目(2004AA4Z3020)

摘　　要：在商用数据库管理系统DM4中设计并实现了过程SQL语言DMPL/SQL.提出了DMPL/SQL语言解释器的总体结构.该解释器由编译器和虚拟机两部分构成.编译器分析源代码并生成中间代码,虚拟机以立即或延迟的方式对中间代码进行解释执行.介绍了实现DMPL/SQL语言解释器的关键技术.为提高程序的执行效率,在名字解析、SQL语句的执行以及异常处理等阶段采用了多种优化方法.该语言目前已广泛使用于基于DM4的数据库应用中.A procedural SQL language called DMPL/SQL is designed and implemented in DM4, a commercial database management system. The framework of the interpreter of DMPL/SQL, consisting of a compiler and a virtual machine, was proposed. In the compiler, source codes were analyzed and object codes built. The object codes were executed by the virtual machine in immediate or delayed modes. The key techniques of the interpreter implementation were introduced. Several optimization methods were used in phases of name parsing, SQL statement executing, and exception handling to improve the performance of programs. The language had been used in many database applications based on DM4 now.

关 键 词：过程SQL语言 解释器 虚拟机 

分 类 号：TP392[自动化与计算机技术—计算机应用技术]