Difference between revisions of "Dbxtkey()"
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<input parameters> | <input parameters> | ||
| − | char *dbx; /* Tagged index file pointer | + | char *dbx; /* Tagged index file pointer */ |
| − | char key; /* Address of a buffer containing the key | + | char key; /* Address of a buffer containing the key */ |
| − | int softseek; /* If 1, then perform a softseek | + | int softseek; /* If 1, then perform a softseek */ |
<output parameters> | <output parameters> | ||
| − | long *recno; /* Address of a buffer where record number is returned | + | long *recno; /* Address of a buffer where record number is returned */ |
</code> | </code> | ||
| Line 25: | Line 25: | ||
The dbxtkey(() function returns 0 for success, or < 0 if an error occurs. See the section on [[Library Return Code Values|return code values]] for a detailed list of return codes. | The dbxtkey(() function returns 0 for success, or < 0 if an error occurs. See the section on [[Library Return Code Values|return code values]] for a detailed list of return codes. | ||
| + | |||
==DESCRIPTION== | ==DESCRIPTION== | ||
The dbxtkey() function translates a key into its associated record number by searching for the specified key in the active tag. | The dbxtkey() function translates a key into its associated record number by searching for the specified key in the active tag. | ||
| − | |||
| Line 40: | Line 40: | ||
<code lang="c"> | <code lang="c"> | ||
#include <stdio.h> | #include <stdio.h> | ||
| − | #include "dbl.h" /* Recital/Library include file */ | + | #include "dbl.h" /* Recital/Library include file */ |
| − | #include "dblproto.h" /* Recital/Library prototype file */ | + | #include "dblproto.h" /* Recital/Library prototype file */ |
static dBFIELD fields[6] = { | static dBFIELD fields[6] = { | ||
| Line 59: | Line 59: | ||
main() | main() | ||
{ | { | ||
| − | int rc; /* Return Code for error handling */ | + | int rc; /* Return Code for error handling */ |
| − | char *dbf; /* File descriptor for table | + | char *dbf; /* File descriptor for table */ |
| − | char *dbx; /* File descriptor for tagged index */ | + | char *dbx; /* File descriptor for tagged index */ |
| − | char record[58]; /* Array of char for records | + | char record[58]; /* Array of char for records */ |
| − | char status; /* Deleted record flag | + | char status; /* Deleted record flag */ |
| − | long recno; /* Table record variable | + | long recno; /* Table record variable */ |
| − | char key[21]; /* Storage location for keys | + | char key[21]; /* Storage location for keys */ |
rc = dbdcache(100); | rc = dbdcache(100); | ||
| Line 79: | Line 79: | ||
rc = dbxtkey(dbx, "Santa Rosa ", &recno, 0); | rc = dbxtkey(dbx, "Santa Rosa ", &recno, 0); | ||
errorproc("dbxtkey()", "record number found by key.", rc); | errorproc("dbxtkey()", "record number found by key.", rc); | ||
| − | printf(" | + | printf("\t\trecord number: \t%d\n", recno); |
rc = dbxgetrk(dbf, dbx, "Santa Rosa ", record, &status); | rc = dbxgetrk(dbf, dbx, "Santa Rosa ", record, &status); | ||
errorproc("dbxgetrk()", "record retrieved by key.", rc); | errorproc("dbxgetrk()", "record retrieved by key.", rc); | ||
| − | printf(" | + | printf("\t\t%s\n", record); |
rc = dbxckey(dbx, key, &recno); | rc = dbxckey(dbx, key, &recno); | ||
errorproc("dbxckey()", "current key read.", rc); | errorproc("dbxckey()", "current key read.", rc); | ||
| − | printf(" | + | printf("\t\tcurrent key: \t%s\n", key); |
rc = dbxclose(dbx); | rc = dbxclose(dbx); | ||
| Line 95: | Line 95: | ||
exit(0); | exit(0); | ||
| − | } | + | } |
static void errorproc(func, str, rc) | static void errorproc(func, str, rc) | ||
| Line 101: | Line 101: | ||
char *str; | char *str; | ||
int rc; | int rc; | ||
| − | { | + | { |
| − | + | if ( rc != SUCCESS ) { | |
| − | + | printf("\n Error performing function %s -> %d\n", func, rc); | |
| − | + | exit(1); | |
} | } | ||
| − | printf("Function: t%s, t%s - | + | printf("Function: \t%s, \t%s - Ok\n", func, str); |
return; | return; | ||
} | } | ||
Latest revision as of 10:39, 6 May 2009
PURPOSE
translate tag key to record number
SYNOPSIS
#include "dbl.h" int dbxtkey(dbx, key, recno, softseek) <input parameters> char *dbx; /* Tagged index file pointer */ char key; /* Address of a buffer containing the key */ int softseek; /* If 1, then perform a softseek */ <output parameters> long *recno; /* Address of a buffer where record number is returned */
RETURN VALUE
The dbxtkey(() function returns 0 for success, or < 0 if an error occurs. See the section on return code values for a detailed list of return codes.
DESCRIPTION
The dbxtkey() function translates a key into its associated record number by searching for the specified key in the active tag.
EXAMPLE
The following example searches for "Santa Rosa" in the VESSEL tag of the shipwreck table and returns the record number.
#include <stdio.h> #include "dbl.h" /* Recital/Library include file */ #include "dblproto.h" /* Recital/Library prototype file */ static dBFIELD fields[6] = { "VESSEL", 'C', 18, 0, 0, "LAT", 'N', 4, 1, 0, "LONG", 'N', 4, 1, 0, "AMOUNT", 'N', 10, 0, 0, "DATE", 'D', 8, 0, 0, "FLAG", 'C', 9, 0, 0 }; static void errorproc( char *func, char *str, int rc); main() { int rc; /* Return Code for error handling */ char *dbf; /* File descriptor for table */ char *dbx; /* File descriptor for tagged index */ char record[58]; /* Array of char for records */ char status; /* Deleted record flag */ long recno; /* Table record variable */ char key[21]; /* Storage location for keys */ rc = dbdcache(100); errorproc("dbdcache()","table cache specified.", rc); rc = dbicache(100); errorproc("dbicache()", "index cache specified.",rc); rc = dbfilemode(1,0); rc = dbopen("shipwreck.dbf", &dbf); errorproc("dbopen()","table opened in shared mode.", rc); rc = dbxopen(dbf, "shipwreck.dbx", &dbx); errorproc("dbxopen()","tagged index opened.", rc); rc = dbxtkey(dbx, "Santa Rosa ", &recno, 0); errorproc("dbxtkey()", "record number found by key.", rc); printf("\t\trecord number: \t%d\n", recno); rc = dbxgetrk(dbf, dbx, "Santa Rosa ", record, &status); errorproc("dbxgetrk()", "record retrieved by key.", rc); printf("\t\t%s\n", record); rc = dbxckey(dbx, key, &recno); errorproc("dbxckey()", "current key read.", rc); printf("\t\tcurrent key: \t%s\n", key); rc = dbxclose(dbx); errorproc("dbxclose()", "tagged index closed.", rc); rc = dbclose(dbf); errorproc("dbclose()", "table closed.", rc); exit(0); } static void errorproc(func, str, rc) char *func; char *str; int rc; { if ( rc != SUCCESS ) { printf("\n Error performing function %s -> %d\n", func, rc); exit(1); } printf("Function: \t%s, \t%s - Ok\n", func, str); return; }
