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sybase
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dblibrary
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example6.c
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C/C++ Source or Header
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1993-04-22
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5KB
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200 lines
/*
** example6.c
**
** This example illustrates opening a data file, inserting data
** from the file into a newly created table containing several
** SQL Server datatypes, and updating the table using browse-mode
** techniques.
*/
#include <stdio.h>
#include <sybfront.h>
#include <sybdb.h>
#define BUFLEN 2048
/* Forward declarations of the error-handler and message-handler routines. */
int err_handler();
int msg_handler();
main()
{
LOGINREC *login;
DBPROCESS *q_dbproc; /* This DBPROCESS will be used to
* query the database.
*/
DBPROCESS *u_dbproc; /* This DBPROCESS will be used to
* simultaneously update the database.
*/
char *qualptr; /* This will point to the WHERE clause
* appropriate for updating q_dbproc's
* current data row.
*/
RETCODE return_code;
DBTINYINT age;
char cmdbuf[BUFLEN];
FILE *infile;
/* Initialize DB-Library. */
if (dbinit() == FAIL)
exit(ERREXIT);
/* Install the user-supplied error-handling and message-handling
* routines. They are defined at the bottom of this source file.
*/
dberrhandle(err_handler);
dbmsghandle(msg_handler);
/* Allocate and initialize the LOGINREC structure to be used
* to open a connection to SQL Server.
*/
login = dblogin();
DBSETLPWD(login, "server_password");
DBSETLAPP(login, "example6");
q_dbproc = dbopen(login, NULL);
u_dbproc = dbopen(login, NULL);
printf("Creating the 'alltypes' table.\n");
/* Create a table that contains several SQL Server data types. */
dbcmd(q_dbproc,"create table alltypes ");
dbcmd(q_dbproc,"(age tinyint,");
dbcmd(q_dbproc,"userid smallint,");
dbcmd(q_dbproc,"royalty int,");
dbcmd(q_dbproc,"name char(25),");
dbcmd(q_dbproc,"title_id varbinary(20),");
dbcmd(q_dbproc,"us_citizen bit,");
dbcmd(q_dbproc,"account float,");
dbcmd(q_dbproc,"title varchar(20),");
dbcmd(q_dbproc,"manager char(25),");
dbcmd(q_dbproc,"timestamp)");
dbcmd(q_dbproc, "create unique index index1 on alltypes(userid)");
dbsqlexec(q_dbproc);
while (dbresults(q_dbproc) != NO_MORE_RESULTS)
continue;
/* Insert rows of data into the newly created table "alltypes".
* We will read in the contents of the file and form an
* INSERT statement.
*/
if ((infile=fopen("datafile","r")) == NULL)
{
printf("Unable to open file 'datafile'.\n");
exit(STDEXIT);
}
printf("Inserting rows into the 'alltypes' table...\n");
while ((fgets(cmdbuf,BUFLEN,infile)) != NULL)
{
dbfcmd(q_dbproc,"insert into alltypes \n");
dbfcmd(q_dbproc,"values(%s, null) \n",cmdbuf);
}
dbsqlexec(q_dbproc);
/* Process the results of each of the INSERT statements. */
while ((return_code = dbresults(q_dbproc)) != NO_MORE_RESULTS)
{
if (return_code == FAIL)
printf("One of the insert statements FAILed.\n");
}
/* Using DB-Library's browse-mode facilities, we'll increment
* the age of every person in the table.
*/
printf("Updating rows in the 'alltypes' table...\n");
dbcmd(q_dbproc,"select * from alltypes for browse");
dbsqlexec(q_dbproc);
while ((return_code = dbresults(q_dbproc)) != NO_MORE_RESULTS)
{
if (return_code == SUCCEED)
{
while (dbnextrow(q_dbproc) != NO_MORE_ROWS)
{
age = *((DBTINYINT *)(dbdata(q_dbproc, 1)));
qualptr = dbqual(q_dbproc, -1, "alltypes");
dbcmd(u_dbproc, "update alltypes");
dbfcmd
(u_dbproc, " set age = %d %s", age+1, qualptr);
dbsqlexec(u_dbproc);
dbresults(u_dbproc);
dbfreequal(qualptr);
}
}
}
/* Now, we'll look at the updated contents of the table, to
* verify that the ages were properly incremented.
*/
printf("Selecting rows from the 'alltypes' table:\n");
dbcmd(q_dbproc, "select * from alltypes");
dbsqlexec(q_dbproc);
dbresults(q_dbproc);
dbprrow(q_dbproc);
dbexit();
exit(STDEXIT);
}
int err_handler(dbproc, severity, dberr, oserr, dberrstr, oserrstr)
DBPROCESS *dbproc;
int severity;
int dberr;
int oserr;
char *dberrstr;
char *oserrstr;
{
if ((dbproc == NULL) || (DBDEAD(dbproc)))
return(INT_EXIT);
else
{
printf("DB-Library error:\n\t%s\n", dberrstr);
if (oserr != DBNOERR)
printf("Operating-system error:\n\t%s\n", oserrstr);
return(INT_CANCEL);
}
}
int msg_handler(dbproc, msgno, msgstate, severity, msgtext,
srvname, procname, line)
DBPROCESS *dbproc;
DBINT msgno;
int msgstate;
int severity;
char *msgtext;
char *srvname;
char *procname;
DBUSMALLINT line;
{
printf ("Msg %ld, Level %d, State %d\n",
msgno, severity, msgstate);
if (strlen(srvname) > 0)
printf ("Server '%s', ", srvname);
if (strlen(procname) > 0)
printf ("Procedure '%s', ", procname);
if (line > 0)
printf ("Line %d", line);
printf("\n\t%s\n", msgtext);
return(0);
}