Difference between revisions of "Dbxnotags()"
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| Line 12: | Line 12: | ||
<input parameters> | <input parameters> | ||
| − | char *dbx; /* Tagged index file descriptor */ | + | char *dbx; /* Tagged index file descriptor */ |
<output parameters> | <output parameters> | ||
| − | int *notags; /* Number of tags in the .DBX file */ | + | int *notags; /* Number of tags in the .DBX file */ |
</code> | </code> | ||
| Line 38: | Line 38: | ||
<code lang="c"> | <code lang="c"> | ||
#include <stdio.h> | #include <stdio.h> | ||
| − | #include "dbl.h" | + | #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 55: | Line 55: | ||
int rc); | int rc); | ||
| − | main() | + | main() |
| − | { | + | { |
| − | + | int rc; /* Return Code for error handling */ | |
| − | + | char *dbf; /* File descriptor for table */ | |
| − | + | char *dbx; /* File descriptor for tagged index */ | |
| − | + | char keytype; /* Variable for varying keytype */ | |
| − | + | char tagname[21]; /* Storage location for tag name */ | |
| − | + | char keyexpr[512]; /* Storage location for key expr */ | |
| − | + | char forexpr[512]; /* Storage location for for expr */ | |
| − | + | int kexprlen; /* The key expression length */ | |
| − | + | int keylen; /* The key length */ | |
| − | + | int i; /* Loop control variable */ | |
| − | + | int keyunique; /* Boolean for unqiue tag key */ | |
| − | + | int keydescend; /* Boolean for descending tag key */ | |
| − | + | int notags; /* Number of tags in a dbx file */ | |
| − | + | rc = dbdcache(100); | |
| − | + | errorproc("dbdcache()","table cache specified.", rc); | |
| − | + | rc = dbicache(100); | |
| − | + | errorproc("dbicache()", "index cache specified.",rc); | |
| − | + | rc = dbfilemode(0,0); | |
| − | + | rc = dbopen("shipwreck.dbf", &dbf); | |
| − | + | errorproc("dbopen()","table opened in exclusive mode.", rc); | |
| − | + | rc = dbxopen(dbf, "shipwreck.dbx", &dbx); | |
| − | + | errorproc("dbxopen()","tagged index opened.", rc); | |
| − | + | rc = dbxnotags(dbx, ¬ags); | |
| − | + | errorproc("dbxnotags()","tagged index count obtained.", rc); | |
| − | + | printf("\t Key count: \t%d\n", notags ); | |
| − | + | for (i = 1; i <= notags; i++) { | |
| − | + | rc = dbxkexpr(dbx, | |
&i, | &i, | ||
tagname, | tagname, | ||
| Line 95: | Line 95: | ||
&keyunique, | &keyunique, | ||
&keydescend); | &keydescend); | ||
| − | + | errorproc("dbxkexpr()", "key information retrieved.", rc); | |
| − | + | printf("\t Key number: \t%d\n", i ); | |
| − | + | printf("\t Key name: \t%s\n", tagname ); | |
| − | + | printf("\t Key type: \t%c\n", keytype ); | |
| − | + | printf("\t Key expression: %s\n", keyexpr); | |
| − | + | printf("\t Key length: %d Expression length: %d\n", kexprlen, keylen); | |
| − | + | printf("\t For expression: %s\n", forexpr); | |
| − | + | printf("\t Key unique: \t%s\n", keyunique ? "Yes" : "No" ); | |
| − | + | printf("\t Key descending: \t%s\n", keydescend?"Yes":"No" ); | |
| − | + | } | |
| − | + | 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) | static void errorproc(func, str, rc) | ||
| Line 117: | Line 117: | ||
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; | ||
} | } | ||
Revision as of 16:07, 5 May 2009
PURPOSE
return the number of index tags in a tagged index file
SYNOPSIS
#include "dbl.h" int dbxnotags(dbx, notags) <input parameters> char *dbx; /* Tagged index file descriptor */ <output parameters> int *notags; /* Number of tags in the .DBX file */
RETURN VALUE
The dbxnotags() 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 dbxnotags() function is used to find out the number of tag in the specified index. There must be at least one tag in the index file, up to a maximum of 128.
EXAMPLE
The following example checks the number of tags on the shipwreck.dbf table, then returns detailed information about the tags
#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 keytype; /* Variable for varying keytype */ char tagname[21]; /* Storage location for tag name */ char keyexpr[512]; /* Storage location for key expr */ char forexpr[512]; /* Storage location for for expr */ int kexprlen; /* The key expression length */ int keylen; /* The key length */ int i; /* Loop control variable */ int keyunique; /* Boolean for unqiue tag key */ int keydescend; /* Boolean for descending tag key */ int notags; /* Number of tags in a dbx file */ rc = dbdcache(100); errorproc("dbdcache()","table cache specified.", rc); rc = dbicache(100); errorproc("dbicache()", "index cache specified.",rc); rc = dbfilemode(0,0); rc = dbopen("shipwreck.dbf", &dbf); errorproc("dbopen()","table opened in exclusive mode.", rc); rc = dbxopen(dbf, "shipwreck.dbx", &dbx); errorproc("dbxopen()","tagged index opened.", rc); rc = dbxnotags(dbx, ¬ags); errorproc("dbxnotags()","tagged index count obtained.", rc); printf("\t Key count: \t%d\n", notags ); for (i = 1; i <= notags; i++) { rc = dbxkexpr(dbx, &i, tagname, &keytype, keyexpr, forexpr, &kexprlen, &keylen, &keyunique, &keydescend); errorproc("dbxkexpr()", "key information retrieved.", rc); printf("\t Key number: \t%d\n", i ); printf("\t Key name: \t%s\n", tagname ); printf("\t Key type: \t%c\n", keytype ); printf("\t Key expression: %s\n", keyexpr); printf("\t Key length: %d Expression length: %d\n", kexprlen, keylen); printf("\t For expression: %s\n", forexpr); printf("\t Key unique: \t%s\n", keyunique ? "Yes" : "No" ); printf("\t Key descending: \t%s\n", keydescend?"Yes":"No" ); } 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; }
