工程数据库语言COHORL

An Engineering Data Base Language COHORL

本文简要的介绍工程数据库管理系统 DATFEA 的数据库语言 COHORL。面向复杂工程对象的定义和操作,多版本数据的管理,定义、生成和操作局部库以支持工程应用长事务、完整性控制的局部化和模式的修改,是 COHORL 的主要功能。使用记录命名符、赋值语句使数据库操作命令接近于工程应用程序的编程语言。游标语句使面向集合的运算能引入 COHORL。

This paper briefly introduces a database language COHORL used in an engineering DBMS DATFEA,being develo- ped in SMU.The language features the complex engineering object definition and manipulation,multi-version data manage- ment,local database definition,generation and manipulation for supporting long term engineering application transactions, the integrity control localization,and schema modification.it records designators,assignment statements,and other features make COHORL'S traditional database operations closer to engineering programming language statements.The cursor state- ment introduces set-oriented operations into COHORL.