83 lines
1.5 KiB
C
83 lines
1.5 KiB
C
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/***********************************************************************\
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* *
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* RELATE2.C Copyright (C) 1993 Sequiter Software Inc. *
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* *
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\***********************************************************************/
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/* See User's Manual, page 139 */
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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;
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void open_data_files() ;
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void open_data_files()
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{
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student = d4open(&code_base,"STUDENT");
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e4exit_test(&code_base);
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}
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void print_record(DATA4 *data_file)
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{
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int j;
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for(j=1;j<=d4num_fields(data_file);j++)
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printf("%s "
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,f4memo_str(d4field_j(data_file,j)));
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printf("\n");
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}
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void query(DATA4 *data_file
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,char *expr
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,char *order)
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{
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RELATE4 *relation = NULL;
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int rc;
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relation = relate4init(data_file);
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if(relation == NULL) exit(1);
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relate4query_set(relation,expr);
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relate4sort_set(relation,order);
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for(rc = relate4top(relation);rc != r4eof
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;rc = relate4skip(relation,1L))
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print_record(data_file);
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printf("\n");
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relate4unlock(relation);
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relate4free(relation,0);
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}
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void main()
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{
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int rc,num_fields,j;
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d4init(&code_base);
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open_data_files();
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query(student
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,"AGE > 30"
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,"");
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query(student
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,"UPPER(L_NAME) = 'MILLER'"
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,"L_NAME + F_NAME");
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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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exit(0) ;
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}
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