101 lines
2.1 KiB
C
101 lines
2.1 KiB
C
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/***********************************************************************\
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* *
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* RELATE4.C Copyright (C) 1993 Sequiter Software Inc. *
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* *
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\***********************************************************************/
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/* See User's Manual, page 148 */
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#include "d4all.h"
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#ifdef __TURBOC__
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extern unsigned _stklen = 10000;
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#endif
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CODE4 code_base;
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DATA4 *student = NULL,*enrolment = NULL;
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FIELD4 *id,*f_name,*l_name,*age,*c_code;
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RELATE4 *master = NULL,*slave = NULL;
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TAG4 *id_tag,*name_tag;
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void open_data_files() ;
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void set_relation() ;
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void print_record() ;
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void open_data_files()
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{
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d4init(&code_base);
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student = d4open(&code_base,"STUDENT");
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enrolment = d4open(&code_base,"ENROLL");
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id = d4field(student,"ID");
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f_name = d4field(student,"F_NAME");
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l_name = d4field(student,"L_NAME");
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age = d4field(student,"AGE");
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c_code = d4field(enrolment,"C_CODE_TAG");
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name_tag = d4tag(student,"NAME");
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id_tag = d4tag(enrolment,"STU_ID_TAG");
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e4exit_test(&code_base);
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}
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void set_relation()
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{
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master = relate4init(student);
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slave = relate4create_slave(master, enrolment, "ID", id_tag);
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}
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void seek(DATA4 *data_file, TAG4 *tag, RELATE4 *relation, char *key)
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{
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TAG4 *old_tag;
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old_tag = d4tag_selected(data_file);
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d4tag_select(data_file,tag);
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d4seek(data_file,key);
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relate4do(relation);
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d4tag_select(data_file,old_tag);
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}
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void print_record()
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{
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printf("%15s ",f4str(f_name));
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printf("%15s ",f4str(l_name));
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printf("%6s ",f4str(id));
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printf("%2s ",f4str(age));
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printf("%7s\n",f4str(c_code));
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}
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void main()
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{
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open_data_files();
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set_relation();
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seek(student
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,name_tag
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,master
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,"Tyler Harvey ");
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print_record();
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seek(student
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,name_tag
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,master,"Miller Albert ");
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print_record();
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relate4unlock(master);
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relate4free(master,0);
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d4close_all(&code_base);
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d4init_undo(&code_base);
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mem4reset() ;
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}
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