不用说,朋友们一定注意到了在求职主机工作中,很大部分的雇主要求要会CICS. 没接触过CICS的朋友一定会觉得这个冬冬高深莫测,但实际上,CICS不过是搭建在主机上的一个高层应用,主要用于保证联机交易的正常运行. 我以前已经在
"论坛上 回答过一位朋友,为何银行等实时性强的系统都用CICS而不自己写同步交易. 在这里,我打算用一个最简单的CICS程序, 展现一个Hello world的屏幕,作为入门,本程序不涉及读写数据库或者文件. 但本程序已经有响应键盘输入(F1,F3,F5.....)的功能. 还等什么,现在就来开始学习吧!
STEP1:编写MAP MICRO程序.请注意,三要素:DFHMSD, DFHMDI, DFHMDF. 分别代表MAPSET, MAP和里面的FIELD.
STEP2:编译MAP MICRO.事实上会生成2个咚咚:一个叫做PHYSICAL MAP,一个叫做SYMBOLIC MAP. 请注意:PHYSICAL MAP是二进制文件,给CICS调用;而SYMBOLIC MAP是COPYBOOK,给COBOL程序引用里面的变量.
STEP3:下面进入CICS环境去定义刚才生成的MAP,命令CEDA DEF MAPSET(HELLOM) GROUP(TEST) ,为啥要这样定义呢?因为CICS是高层应用,它需要知道调用的MAP是指向外面的哪个程序.
STEP4:定义完了以后要安装,用CEDA INS MAPSET(HELLOM) GROUP(TEST)
STEP5:开始编写Hello world的COBOL程序
STEP6:编译cobol程序的作业流. 因为系统已经提供了一个proc名为DFHEITVL,因此作业流可以写得非常简单,这里请注意,有个参数‘OUT=H‘一定要写,否则编译出来的 OUTPUT看不到编译过程和错误细节. 这一点是经过HUNTER大虾的帮助才明白的,让我少走了不少弯路
STEP7:程序编译完成,放在alluser.cics.load库下,此库已经定义到CICS启动作业流中,因此可以直接引用里面的module,也 就是刚编译出来的HELLOC.这时候进入CICS, 用CEDA DEF PROG(HELLOC) GROUP(TEST)来定义程序. 和MAP的原理一样,CICS需要知道,在他自己CICS内部的程序名对应于哪个外部的MODULE
STEP8:和MAP一样,程序HELLOC定义完以后要安装,用CEDA INS PROG(HELLOC) GROUP(TEST)来安装
STEP9:这时候要定义一个CICS交易,命名为‘HLLO‘.此交易调用程序‘HELLOC‘,用CEDA DEF TRANS(HLLO) PROG(HELLOC) GROUP(TEST)来定义
STEP10:同理,定义完交易以后要安装,用CEDA INS TRANS(HLLO) GROUP(TEST)
STEP11:最后一步,运行交易HLLO,哈哈!终于看到画面了...试试看能否响应你的键盘输入? F1,F7,F8.... br>
如果您还有什么不明白的,请到
"论坛上发问,我愿意随时回答您的问题,谢谢!
Posted by:
why 於 Tuesday, March 08 @ 00:00:00 EST
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注册Re: 给新入门CICS的朋友们----CICS下的Hello World! (本站长又一倾力之作) (分数： 1)
由 Keith 於 Thursday, January 26 @ 14:59:45 EST
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非常清晰，谢谢！
但为何我使用你的‘JIA.CICS.JCL(HELLOJM)‘和‘JIA.CICS.JCL(HELLOJC)‘分别提示说找不到‘DFHMAPS‘和‘DFHEITVL‘？请指教。
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