To Retrieve and manipulate .dbf files through c program (Mini Project)

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Home » C Home » DBMS Projects Home » To Retrieve and manipulate .dbf files through c program (Mini Project)

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Title	To Retrieve and manipulate .dbf files through c program (Mini Project)
Author	narender
Author Email	narencool_1984 [at] yahoo.com
Description	I had devloped this progarme during my training in Sixth semester B.E.(comp Sc.).this program effectively connects .dbf database files in the c program and performs various functions on it
Category	C » DBMS Projects
Hits	397041
Code	Select and Copy the Code
Code : // This is devloped by narender #include <stdio.h> #include <stdlib.h> #include <string.h> #define MAXFIELDS 1000 #include<mem.h> #include<string.h> void main(int argc, char argv[]) { char p,q,r,buf; typedef char string11[12]; FILE in,out,out1; int a,i,j,n,field_pos[MAXFIELDS+1],nfield=0,pos,lrec; char record,field_type[MAXFIELDS]; // string11 field_data[500]; string11 field_name[MAXFIELDS]; struct { char version; / dBase version / char datum[3]; / date of last update YYMMDD / long nrec; / nr of records in th database file / short nhead; / nr of bytes in the header / short lrec; / nr of bytes in the record / char dum1[2]; char transact; / flag for incomplete transaction / char encrypt; / encryption flag / char mdx; / flag for presence of mdx-file / char dum2[3]; } header; struct { char name[11]; / fieldname zero filled / char type; / field type (C, D, F, L, M, N) / char dum1[4]; unsigned char length; / field length in binary / char ndec; / field decimal count in binary / char dum2[2]; char workid; / work area ID / char dum3[11]; char data[10]; } field; switch(argc) { case 1: in=stdin; break; case 2: if ((in = fopen(argv[1],"rb")) == NULL) { fprintf(stderr,"Input file %s not found ",argv[1]); exit(1); } break; default: fprintf(stderr,"Usage: %s dbase_file > database ",argv[0]); fprintf(stderr,"Or: cat dbase_file \| %s >database ",argv[0]); exit(1); } fread(&header,32,1,in); n=header.lrec; pos=1; // a=field_name[3]; while (n>1) { if (nfield==MAXFIELDS) { fprintf(stderr,"Too many fields "); exit(1); } fread(&field,32,1,in); strcpy(field_name[nfield],field.name); field_type[nfield]=field.type; // printf(" FIELD: %s",field_name[3]); field_pos[nfield++]=pos; pos+=(int)field.length; n-=(int)field.length; } for (i=1;i<nfield;i++) { printf("%s%c",field_name[i],i==nfield-1?' ':' '); } // for (i=0;i<nfield;i++) printf( "!%s%c", field_name[i],i==nfield-1?' ':' '); field_pos[nfield]=pos; / one extra for length calculation of last field / // printf(" %s",field_name[3].data); fread(&i,1,1,in); /read field terminator / if (i!=0xD) { fprintf(stderr,"Illegal field terminator; more than %d fields? ",MAXFIELDS); exit(1); } lrec=header.lrec; record=malloc(lrec+2); for (i=1;i<header.nrec;i++) { if (fread(record,lrec,1,in)!=1) { fprintf(stderr,"Error reading record %d ",i+1); exit(1); } if (record!='') / if not a deleted record / for (j=1;j<nfield;j++) { if(j==1) { p=record+field_pos[j]; / first char of the field / q=record+field_pos[j+1]-1; / last char of the field / while (p==' ' && p<=q) p++; /* remove leading spaces / while (q==' ' && p<=q) *(q--)='

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