Difference between revisions of "Library dblsamp"

Revision as of 11:47, 3 April 2009

The following program is written in 'C' as an example program using the RECITAL/Library functions. This file is stored in the SDK dbl sub-directory and is called "dblsamp.c".
/*#==================================================
 *# Copyright (C) 1988-2009 Recital Corporation Inc.
 *# As an unpublished licensed proprietary work.
 *# All rights reserved worldwide.
 *#
 *# This program may be freely copied and used as a template for user
 *# programs which make use of the Recital/Library in so long as the above
 *# copyright notice is included.
 *#
 #===================================================
 *
 *MODULE	: dblsamp.c
 *
 *PURPOSE	: Recital Database Library sample program.
 *
 *AUTHOR	: RECITAL CORPORATION
 * 
 *==================================================*/
 
#include <stdio.h>
#include "dbl.h"			/* Recital Library include file		*/
#include "dblproto.h" 		/* Recital Library prototype file	 	*/
 
extern int g_disable_txcount;
 
/*-----------------------------------------------------------------------------------------*/
/* Table structure for db to be constructed.							*/
/* Structure dBFIELD defined in dbl.h								*/
/*-----------------------------------------------------------------------------------------*/
static dBFIELD fields[7]
=
{
	"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,
	"MEMO", 'M', 4, 0, 0
};
 
/*-----------------------------------------------------------------------------------------*/
/* Static Error Handling procedure.								*/
/*-----------------------------------------------------------------------------------------*/
static int errorproc();
 
/*-----------------------------------------------------------------------------------------*/
/* Table records to add.										*/
/*-----------------------------------------------------------------------------------------*/
static char
		*text_table[] = {
				"Santa Margarita		80.027.5		7000000 95/01/01		Spanish  ",
				"Santa Rosa			 81.824.8		30000000		32/01/01		Spanish  ",
				"Unknown galleon		83.123.0		0			   15/01/01		Spanish",
				"Jessie				 97.127.4		100000  75/01/01		U.S.	 ",
				"Lea					96.227.8		1000000 80/01/01		U.S.	 ",
				"S.J. Lee			   96.926.9		200000  75/01/01		U.S.	 ",
				"Genovase			   78.418.4		1850000 30/01/01		Spanish  ",
				"Unknown Vessel 77.517.9		0			   75/01/01		U.S.	 " };
 
/*-----------------------------------------------------------------------------------------*/
/* Main program entry point.									*/
/*-----------------------------------------------------------------------------------------*/
main() {
	int			rc;					/* Return Code for error handling	*/
	char			*dbf;				/* File descriptor for table		*/
	char			*dbx;				/* File descriptor for tagged index	*/
	char			*ndx;				/* File descriptor for index		*/
	char			*dbt;				/* File descriptor for memo file	*/
	char			record[58];			/* Array of char for records		*/
	char			keytype;				/* Variable for varying keytype	*/
	char			key[21];				/* Storage location for keys		*/
	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				*/
	dBFIELD		dbfields[128];		/* Storage location for field names	*/
	FLDNUM		fieldcount;			/* Number of fields to create		*/
	int			fldpos[128];		/* Fields position buffer		*/
	char			flddes[128][26];		/* Fields description buffer		*/
	char			tmpbuf[81];			/* Temporary storage buffer		*/
	char			fldbuf[128][256];		/* Field buffer (recin()/out())	*/
	char			nextkey[10][20];		/* Key buffers (dbnkey())		*/
	char			status;			/* Deleted record flag			*/
	long			recno;			/* Table record variable		*/
	long			rec_no[10];			/* Record number array (dbnkey())	*/
	long			db_size;			/* Size of table variable		*/
	int			reclen;			/* Table record length variable	*/
	char			month;			/* Month variable				*/
	char			day;				/* Day variable				*/
	char			year;				/* Year variable				*/
	FLDNUM		nofields;			/* Number of table fields variable	*/
	int			i;		 		/* Loop control variable		*/
	double		n;				/* Double numeric variable		*/
	int			keyunique;			/* Boolean for unique tag key		*/
	int			keydescend;			/* Boolean for descending tag key	*/
	int			notags;			/* number of tags in a dbx file	*/
 
	/*---------------------------------------------------------------------------------------*/
/* Perform operational Library environment functions.						*/
	/*---------------------------------------------------------------------------------------*/
 
	/*---------------------------------------------------------------------------------------*/
/* DBDCACHE() - this example allocates a 100 record caching area				*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbdcache(100);
	errorproc("dbdcache()", "table cache specified.", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* DBICACHE() - this example allocates 51200 bytes for index caching				*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbicache(100);
	errorproc("dbicache()", "index cache specified.", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* DBFILEMODE() - shared, read write access							*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbfilemode(1, 0);
	errorproc("dbfilemode()", "file mode specified.", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* DBSET() - Set exact index match to true							*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbset("EXACT", 1);
	errorproc("dbset()", "filemode specified.", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* Perform basic table functions.								*/
	/*---------------------------------------------------------------------------------------*/
	fieldcount = 7; /* Number of Fields	 */
 
	/*---------------------------------------------------------------------------------------*/
/* DBCREAT() - this example creates a table according to the 'dBFIELD'				*/
/* array fields.											*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbcreat("shipwreck.dbf", fieldcount, fields);
	errorproc("dbcreat()", "database created.", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* DBCREATX() - Enables the addition of table field descriptions.					*/
	/*---------------------------------------------------------------------------------------*/
	strcpy(flddes[0], "The vessel's name.");
	strcpy(flddes[1], "The latitude.");
	strcpy(flddes[2], "The longitude.");
	strcpy(flddes[3], "The value.");
	strcpy(flddes[4], "The date.");
	strcpy(flddes[5], "The vessel's flag.");
	strcpy(flddes[6], "Notes.");
 
	rc = dbcreatx("shipwreck.dbf", fieldcount, fields, flddes);
 
	/*---------------------------------------------------------------------------------------*/
/* DBOPEN() - example opens table 'shipwreck.dbf' returning the table   */
/* file descriptor (dbf) used in upcoming functions						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbopen("shipwreck.dbf", &dbf);
	errorproc("dbopen()", "table opened.", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* DBGETF() - obtain table information on the table referenced by the				*/
/* 'dbf' file descriptor.										*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbgetf(dbf, &reclen, &month, &day, &year, &nofields, dbfields);
	errorproc("dbgetf()", "information retrieved.", rc);
	printf("\t\tRecord length in bytes: %d\n", reclen);
	printf("\t\tCreation date: \t\t%d/%d/%d\n", month, day, year);
	printf("\t\tNumber of fields: \t%d\n", nofields);
 
	/*---------------------------------------------------------------------------------------*/
/* DBGETFX() - obtain extended table information including the numeric				*/
/* field location array (fldpos) and the field descriptions (flddes).					*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbgetfx(dbf, &reclen, &month, &day, &year, &nofields, dbfields,
			fldpos, flddes);
	errorproc("dbgetfx()", "extra information retrieved.", rc);
	printf("\t\tLocation of fields in buffer: \t%d,%d,%d,%d,%d,%d\n",
			fldpos[1], fldpos[2], fldpos[3], fldpos[4], fldpos[5], fldpos[6]);
 
	/*---------------------------------------------------------------------------------------*/
/* DBLOCKF() - locks the table for the additions that follow.					*/
/* Synonymous with DBTLOCKF(), which tests the lock						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dblockf(dbf);
	if (rc == SUCCESS) {
		printf("Function: \tdblockf() \tfile locked successfully.\n");
	} else {
		printf("Lock Failed. tError: %d\n", rc);
	}
 
	/*---------------------------------------------------------------------------------------*/
/* DBCLOSE() - close the active table								*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbclose(dbf);
	errorproc("dbclose()", "table closed.", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* Exclusive read write access of the table is required to create or delete				*/
/* tags.												*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbfilemode(0, 0);
	rc = dbopen("shipwreck.dbf", &dbf);
	errorproc("dbopen()", "table opened in exclusive mode.", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* Perform basic tagged index functions.							*/
	/*---------------------------------------------------------------------------------------*/
 
	/*---------------------------------------------------------------------------------------*/
/* DBXCREATE() - in this example creates an tag on field VESSEL					*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxcreate(dbf, fields[0].fieldnm, /* "VESSEL",	*/
	&dbx, fields[0].fieldnm, /* "VESSEL",	*/
	NULL, 0, 0);
	errorproc("dbxcreate()", "tag created", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* DBXCREATE() - in this example creates an tag on field FLAG					*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxcreate(dbf, fields[5].fieldnm, /* "FLAG",	  */
	&dbx, fields[5].fieldnm, /* "FLAG",	  */
	NULL, 0, 0);
	errorproc("dbxcreate()", "tag created", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* DBXNOTAGS() - obtains the number of tagged indexes					*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxnotags(dbx, &notags);
	errorproc("dbxnotags()", "tagged index count obtained.", rc);
	printf("\t		 Key count: \t%d\n", notags);
 
	/*---------------------------------------------------------------------------------------*/
/* DBXKEXPR() - obtains tagged index information						*/
	/*---------------------------------------------------------------------------------------*/
	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");
	}
 
	/*---------------------------------------------------------------------------------------*/
/* DBXDROPTAGS() - Drop the specified tag							*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxdroptag(dbx, fields[5].fieldnm);
	errorproc("dbxdroptag()", "tagged index 'FLAG' dropped.", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* DBXCLOSE() - close the active tagged index							*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxclose(dbx);
	errorproc("dbxclose()", "tagged index closed.", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* DBCLOSE() - close the active table								*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbclose(dbf);
	errorproc("dbclose()", "table closed.", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* Reopen the table in shared, read-write access mode						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbfilemode(1, 0);
	rc = dbopen("shipwreck.dbf", &dbf);
	errorproc("dbopen()", "table opened in shared mode.", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* DBXOPEN() - example opens index file 'shipwreck.dbx' returning the 				*/
/* tagged index file descriptor (dbx) used in upcoming functions					*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxopen(dbf, "shipwreck.dbx", &dbx);
	errorproc("dbxopen()", "tagged index opened.", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* Perform basic index functions.								*/
	/*---------------------------------------------------------------------------------------*/
 
	/*---------------------------------------------------------------------------------------*/
/* DBICREAT() - in this example creates an index on field VESSEL					*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbicreat("shipwreck.ndx", fields[0].fieldnm, 18, 'C');
	errorproc("dbicreat()", "index created", rc);
 
	/*---------------------------------------------------------------------------------------*/
/* DBIOPEN() - opens index to active status						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbiopen("shipwreck.ndx", &ndx);
	errorproc("dbiopen()", "index opened.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBKEXPR() - obtains index information						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbkexpr(ndx, &keytype, keyexpr, &kexprlen, &keylen);
	errorproc("dbkexpr()", "key information retrieved.", rc);
	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);
 
	/*---------------------------------------------------------------------------------------*/
	/* Lock data file										*/
	/*---------------------------------------------------------------------------------------*/
	rc = dblockf(dbf);
	if (rc == SUCCESS) {
		printf("Function: \tdblockf() \tfile locked successfully.\n");
	} else {
		printf("Lock Failed. \tError: %d\n", rc);
	}
 
	/*---------------------------------------------------------------------------------------*/
	/* DBLOCKI() - locks the index for following additions					*/
	/* Synonymous with DBTLOCKI() which tests the lock					*/
	/*---------------------------------------------------------------------------------------*/
	rc = dblocki(ndx);
	if (rc == SUCCESS) {
		printf("Function: \tdblocki() \tindex locked successfully.\n");
	} else {
		printf("Lock Failed. tError: %dn", rc);
	}
 
	/*---------------------------------------------------------------------------------------*/
	/* Perform basic memo file functions.							*/
	/*---------------------------------------------------------------------------------------*/
 
	/*---------------------------------------------------------------------------------------*/
	/* DBMCREAT() - creates a table memo file (if one needs creating)			*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbmcreat("shipwreck.dbt");
	errorproc("dbmcreat()", "memo file create", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBMOPEN() - opens an associated memo file						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbmopen("shipwreck.dbt", &dbt);
	errorproc("dbmopen()", "memo file open.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* Perform table input functions.							*/
	/*---------------------------------------------------------------------------------------*/
 
	/*---------------------------------------------------------------------------------------*/
	/* DBAPPEND() - appends a record to the end of the active table				*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbappend(dbf, text_table[0], &recno);
	errorproc("dbappend()", "record appended.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBAKEY() - adds a key to the active index after dbappend()				*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbakey(ndx, "Santa Margarita   ", recno);
	errorproc("dbakey()", "key added.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBXAKEY() - adds a key to the tagged index after dbappend()				*/
	/* The tagged index file must be lock first						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxlocki(dbx);
	errorproc("dbxlocki()", "tagged index file locked.", rc);
	rc = dbxakey(dbx, recno);
	errorproc("dbxakey()", "key added.", rc);
	rc = dbxunlocki(dbx);
	errorproc("dbxunlocki()", "tagged index file unlocked.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBFLUSH() - flushes the record cache to disk						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbflush(dbf);
	errorproc("dbflush()", "table cache flushed.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBIFLSH() - flushes the index cache to disk						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbiflsh(ndx);
	errorproc("dbiflsh()", "index cache flushed.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBXFLSH() - flushes the tagged index cache to disk					*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxflsh(dbx);
	errorproc("dbxflsh()", "Tagged index cache flushed.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBGETR() - retrieves a record								*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbgetr(dbf, (long) 1, record, &status);
	errorproc("dbgetr()", "record retrieved.", rc);
	printf("\t\t%s\n", record);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBPUTM() - put the memo information						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbputm(dbt, "128' 30% coral cover.", &record[53]);
	errorproc("dbputm", "memo placed in buffer", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBUPDR() - updates the record in buffer 'record'					*/
	/* As of v8.0 this function automatically updates any attached indexes.			*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbupdr(dbf, (long) 1, record);
	errorproc("dbupdr()", "record updated.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBGETM() - this example extracts the memo from the record buffer			*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbgetm(dbt, &record[53], tmpbuf, 0);
	errorproc("dbgetm()", "retrieved memo.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBUPDM() - Updates the memo field for this record					*/
	/*---------------------------------------------------------------------------------------*/
	strcat(tmpbuf, " Appending this string to the end of memo...");
	rc = dbupdm(dbt, tmpbuf, &record[53], &record[53]);
	errorproc("dbupdm()", "updated memo.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBPUTRK() - the following example adds a record and index				*/
	/* to the respective files.								*/
	/* DBRECOUT() - scatter the record stored in buffer 'record' to a two			*/
	/* dimensional character array 'fldbuf'							*/
	/*---------------------------------------------------------------------------------------*/
 
	/*---------------------------------------------------------------------------------------*/
	/* Read in 6 more records								*/
	/*---------------------------------------------------------------------------------------*/
 
	for (i = 1; i <= 6; i++) {
		dbrecout(dbf, dbfields, fldpos, text_table[i], fldbuf);
		rc = dbputrk(dbf, ndx, fldbuf[0], text_table[i]);
		errorproc("dbputrk()", "record placed by key.", rc);
	}
	errorproc("dbputrk()", "6 records placed by key.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBFLUSH() - flushes the record cache to disk						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbflush(dbf);
	errorproc("dbflush()", "table cache flushed.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBIFLSH() - flushes the index cache to disk						  */
	/*---------------------------------------------------------------------------------------*/
	rc = dbiflsh(ndx);
	errorproc("dbiflsh()", "index cache flushed.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBXFLSH() - flushes the tagged index cache to disk				   */
	/*---------------------------------------------------------------------------------------*/
	rc = dbxflsh(dbx);
	errorproc("dbxflsh()", "Tagged index cache flushed.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBFIELD() - this example extracts the field 'VESSEL' from the				*/
	/* record (#5) stored in buffer 'record'										*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbgetr(dbf, (long) 5, record, &status);
	/* rc = dbfield( dbf, record, "FLAG", tmpbuf); */
	rc = dbfield(dbf, record, fields[5].fieldnm, tmpbuf);
	errorproc("dbfield()", "field extracted.", rc);
	printf("\t\tFlag: \t%s\n", tmpbuf);
 
	/*---------------------------------------------------------------------------------------*/
	/* Modify a single field in record number 5									 */
	/*---------------------------------------------------------------------------------------*/
 
	/*---------------------------------------------------------------------------------------*/
	/* DBSCATTER() - scatter the record into specified field buffers				*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbscatter(dbf, record, fldbuf);
	errorproc("dbscatter()", "record scattered.", rc);
 
	for (i = 0; i < nofields; i++) {
		fprintf(stdout, "\t\tfldbuf[%d]='%s'\n", i, fldbuf[i]);
	}
	strcpy(fldbuf[5], "Spanish"); /* Modify Field */
 
	/*---------------------------------------------------------------------------------------*/
	/* DBGATHER() - gather the field buffers and place the contents		 */
	/*---------------------------------------------------------------------------------------*/
	rc = dbgather(dbf, record, fldbuf);
	errorproc("dbgather()", "record gathered.", rc);
	printf("\t\t%s\n", record);
 
	rc = dbupdr(dbf, (long) 5, record); /* Finish Example	*/
	errorproc("dbupdr()", "record updated.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* Perform index / index conversion functions.						  */
	/*---------------------------------------------------------------------------------------*/
 
	/*---------------------------------------------------------------------------------------*/
	/* DBREWIND() - position the record pointer to the top of the index file		*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbrewind(ndx);
	errorproc("dbrewind()", "index rewound.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBGETNR() - after 'rewinding' to the top of the table, the first record	  */
	/* can be retrieved with dbgetnr() using the active key				 */
	/*---------------------------------------------------------------------------------------*/
	for (i = 1; i <= 6; i++) {
		rc = dbgetnr(dbf, ndx, record, &status);
		printf("\t\t%d: %s\n", i, record);
	}
	errorproc("dbgetnr()", "6 records retrieved by key.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBNKEY() - get next key													  */
	/*---------------------------------------------------------------------------------------*/
	rc = dbnkey(ndx, nextkey[0], rec_no);
	errorproc("dbnkey()", "next key retrieved.", rc);
	printf("\t\tnext key: \t%s\n", nextkey[0]);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBFWD() - position the pointer to the end of the table					   */
	/*---------------------------------------------------------------------------------------*/
	rc = dbfwd(ndx);
	errorproc("dbfwd()", "index pointer placed at bottom.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBPKEY() - get previous key										  */
	/*---------------------------------------------------------------------------------------*/
	rc = dbpkey(ndx, nextkey[0], rec_no);
	errorproc("dbpkey()", "previous key found.", rc);
	printf("\t\tprev key: \t%s\n", nextkey[0]);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBGETPR() - obtain the previous record by key								*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbgetpr(dbf, ndx, record, &status);
	errorproc("dbgetpr()", "previous record (by key) retrieved.", rc);
	printf("Previous: \t%s\n", record);
 
	/*---------------------------------------------------------------------------------------*/
	/* Rewind the index															 */
	/*---------------------------------------------------------------------------------------*/
	dbrewind(ndx);
 
	/*---------------------------------------------------------------------------------------*/
	/* Perform table retrieval functions using indexes.							 */
	/*---------------------------------------------------------------------------------------*/
 
	/*---------------------------------------------------------------------------------------*/
	/* DBTKEY() - translates supplied key to record number				  */
	/*---------------------------------------------------------------------------------------*/
	rc = dbtkey(ndx, "Santa Rosa	  ", &recno);
	errorproc("dbtkey()", "record number found by key.", rc);
	printf("\t\trecord number: \t%d\n", recno);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBGETRK() - obtains the record from the specified key						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbgetrk(dbf, ndx, "Santa Rosa		", record, &status);
	errorproc("dbgetrk()", "record retrieved by key.", rc);
	printf("\t\t%s\n", record);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBCKEY() - read the current key											  */
	/*---------------------------------------------------------------------------------------*/
	rc = dbckey(ndx, key, &recno);
	errorproc("dbckey()", "current key read.", rc);
	printf("\t\tcurrent key: \t%s\n", key);
 
	/*---------------------------------------------------------------------------------------*/
	/* Perform tagged index functions.							*/
	/*---------------------------------------------------------------------------------------*/
 
	/*---------------------------------------------------------------------------------------*/
	/* DBXREWIND() - position the pointer to the top of the index file			*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxrewind(dbx);
	errorproc("dbxrewind()", "Tagged index rewound.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBXGETNR() - after 'rewinding' to the top of the table, the first record	 */
	/* can be retrieved with dbgetnr() using the active key					*/
	/*---------------------------------------------------------------------------------------*/
	for (i = 1; i <= 6; i++) {
		rc = dbxgetnr(dbf, dbx, record, &status);
		printf("\t\t%d: %s\n", i, record);
	}
	errorproc("dbxgetnr()", "6 records retrieved by tag key.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBXNKEY() - get next key								*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxnkey(dbx, nextkey[0], rec_no);
	errorproc("dbxnkey()", "next key retrieved in tagged index.", rc);
	printf("\t\tnext key: \t%s\n", nextkey[0]);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBXFWD() - position the pointer to the end of the table				*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxfwd(dbx);
	errorproc("dbxfwd()", "index pointer placed at bottom.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBXPKEY() - get previous key								*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxpkey(dbx, nextkey[0], rec_no);
	errorproc("dbxpkey()", "previous key found in tagged index.", rc);
	printf("\t\tprev key: \t%s\n", nextkey[0]);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBXGETPR() - obtain the previous record by key					*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxgetpr(dbf, dbx, record, &status);
	errorproc("dbxgetpr()", "previous record (by key) retrieved.", rc);
	printf("Previous: \t%s\n", record);
 
	/*---------------------------------------------------------------------------------------*/
	/* Rewind the index									*/
	/*---------------------------------------------------------------------------------------*/
	dbxrewind(dbx);
 
	/*---------------------------------------------------------------------------------------*/
	/* Perform table retrieval functions using tagged indexes.				*/
	/*---------------------------------------------------------------------------------------*/
 
	/*---------------------------------------------------------------------------------------*/
	/* DBTKEY() - translates supplied key to record number					*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbtkey(ndx, "Santa Rosa	  ", &recno);
	errorproc("dbtkey()", "record number found by key.", rc);
	printf("\t\trecord number: \t%d\n", recno);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBXGETRK() - obtains the record from the specified key				*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxgetrk(dbf, dbx, "Santa Rosa	   ", record, &status);
	errorproc("dbxgetrk()", "record retrieved by key.", rc);
	printf("\t\t%s\n", record);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBXCKEY() - read the current key							*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxckey(dbx, key, &recno);
	errorproc("dbxckey()", "current key read.", rc);
	printf("\t\tcurrent key: \t%s\n", key);
 
	/*---------------------------------------------------------------------------------------*/
	/* Perform field level functions including index/ASCII functions.				*/
	/*---------------------------------------------------------------------------------------*/
 
	/*---------------------------------------------------------------------------------------*/
	/* DBATOFLD() - converts ASCII string to Recital field					*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbatofld("23.3", 4, 1, tmpbuf);
	errorproc("dbatofld()", "string converted.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBATOKEY() - converts a ASCII string to Recital date key				*/
	/*---------------------------------------------------------------------------------------*/
	key[0] = 'D';
	rc = dbatokey("16430411", key);
	errorproc("dbatokey()", "string converted to key.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBFLDTOA() - converts extracted field to ASCII					*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbfldtoa(record + 18, 4, tmpbuf);
	errorproc("dbfldtoa()", "field converted.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBSTRCPY() - formats character strings to Recital types				*/
	/*---------------------------------------------------------------------------------------*/
	dbstrcpy(key, 'L', 10, "  320000");
	printf("Function: \tdbstrcpy() \toutput: %s\n", key);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBSTRING() - formats non-'C' strings to C strings (null term)				*/
	/*---------------------------------------------------------------------------------------*/
	dbstring("Santa Pedro", 13, tmpbuf);
	printf("Function: \tdbstring() \toutput: %s\n", tmpbuf);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBKEYTOA() - converts an extracted key to ASCII					*/
	/*---------------------------------------------------------------------------------------*/
	tmpbuf[0] = 0; /* Number of decimal places			 */
	tmpbuf[1] = 'N'; /* Key Type								*/
	rc = dbkeytoa(key, tmpbuf);
	errorproc("dbkeytoa()", "key converted.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* Perform record/index deletion and file access						*/
	/*---------------------------------------------------------------------------------------*/
 
	/*---------------------------------------------------------------------------------------*/
	/* DBSIZE() - retrieve the size of the table						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbsize(dbf, &db_size);
	errorproc("dbsize()", "size retrieved.", rc);
	printf("\t		 No. of Records: \t%d\n", db_size);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBPUTR() - adds a record to the end of the table					*/
	/* You can also 'insert' a record using this function					*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbputr(dbf, db_size + 1L, text_table[7]);
	errorproc("dbputr()", "record placed.", rc);
	rc = dbakey(ndx, "Unknown Vessel	", db_size + 1L);
	errorproc("dbakey()", "key added.", rc);
	/*---------------------------------------------------------------------------------------*/
	/* Add record to the Production Index as well 						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxakey(dbx, db_size + 1L);
	errorproc("dbxakey()", "key added.", rc);
 
	dbflush(dbf);
	dbiflsh(ndx);
	dbxflsh(dbx);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBDELETE() - mark a record (number 8) for deletion					*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbdelete(dbf, 8L);
	errorproc("dbdelete()", "record 8 marked for deletion.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBRECALL() - recall a record marked for deletion (number 8)				*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbrecall(dbf, 8L);
	errorproc("dbrecall()", "record 8 recalled.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBRMVKEY() - physically remove a key.  As of v8.0, this function			*/
	/* is not permitted on tables opened shareable.						*/
	/*---------------------------------------------------------------------------------------*/
	/* rc = dbrmvkey(ndx, "Unknown Vessel	", db_size+1L);					*/
	/* errorproc("dbrmvkey()", "key physically removed.", rc);				*/
 
	/*---------------------------------------------------------------------------------------*/
	/* DBRMVR() - physically remove a data record. As of v8.0 this				*/
	/* function is not permitted on tables opened shareable.				*/
	/*---------------------------------------------------------------------------------------*/
	/* rc = dbrmvr(dbf, db_size+1L);								*/
	/* errorproc("dbrmvr()", "record 7 physically removed.", rc);				*/
 
	/*---------------------------------------------------------------------------------------*/
	/* DBUNLOCKF() - unlocks a table file							*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbunlockf(dbf);
	if (rc == SUCCESS) {
		printf("Function: \tdbunlockf() tFile unlocked successfully\n");
	} else {
		printf("Unlock Failed. \tError: %d\n", rc);
	}
 
	/*---------------------------------------------------------------------------------------*/
	/* DBUNLOCKI() - unlocks an index file							*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbunlocki(ndx);
	if (rc == SUCCESS) {
		printf("Function: \tdbunlocki() \tFile unlocked successfully\n");
	} else {
		printf("Unlock Failed. \tError: %d\n", rc);
	}
 
	/*---------------------------------------------------------------------------------------*/
	/* DBLOCKR() - tests available record locking in a multi user				*/
	/* environment.  Same as DBTLOCKR() in multi access					*/
	/*---------------------------------------------------------------------------------------*/
	rc = dblockr(dbf, (long) 7);
	if (rc == SUCCESS) {
		printf("Function: \tdblockr() \trecord locked successfully.\n");
	} else {
		printf("Lock Failed. tError: %dn", rc);
	}
 
	/*---------------------------------------------------------------------------------------*/
	/* DBUNLOCKR() - unlocks a table Record						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbunlockr(dbf, (long) 7);
	if (rc == SUCCESS) {
		printf("Function \tdbunlockr(): \trecord unlocked successfully\n");
	} else {
		printf("Unlock Failed. tError: %d\n", rc);
	}
 
	/*---------------------------------------------------------------------------------------*/
	/* Perform record/index close functions							*/
	/*---------------------------------------------------------------------------------------*/
 
	/*---------------------------------------------------------------------------------------*/
	/* DBICLOSE() - close the active index							*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbiclose(ndx);
	errorproc("dbiclose()", "index closed.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBXCLOSE() - close the active tagged index						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbxclose(dbx);
	errorproc("dbxclose()", "tagged index closed.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBCLOSE() - close the active table							*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbclose(dbf);
	errorproc("dbclose()", "table closed.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* DBMCLOSE() - close the active memo table						*/
	/*---------------------------------------------------------------------------------------*/
	rc = dbmclose(dbt);
	errorproc("dbmclose()", "memo table closed.", rc);
 
	/*---------------------------------------------------------------------------------------*/
	/* Perform miscellaneous Recital/Library functions					*/
	/*---------------------------------------------------------------------------------------*/
 
	/*---------------------------------------------------------------------------------------*/
	/* DBONERROR() - enables/disables (1/0) recovery from errors				*/
	/*---------------------------------------------------------------------------------------*/
	dbonerror(0); /* Recovery disabled */
	printf("Function: \tdbonerror()  \terror checking disabled\n");
 
	printf("\nEnd of Recital C Library test program....\n");
 
	exit(0);
 
}
 
/*---------------------------------------------------------------------------------------*/
/* This procedure handles the return codes from called RECITAL/library				*/
/* functions.  Intended to eliminate cryptic  'if...else...' statements				*/
/* following library calls.									*/
/*---------------------------------------------------------------------------------------*/
 
static int 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;
}
Difference between revisions of "Library dblsamp"

Revision as of 11:47, 3 April 2009

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