cursor_proc.c

sybase linux or unix develope library package

/* Program name: cursor_proc.c
**
** Description : sample cursor program which fetches rows from a given
**		 table using a stored procedure. The procedure also accepts
**		 an input parameter.
**
** Stored proc : Run the script cursor_proc.sql. 
**
** References  : Section on ct_cursor, 'Cursor-Declare Commands' in the 
**		 Client-Library/C Reference Manual.
**
*/
#include <stdio.h>
#include <ctpublic.h>

#define RETURN_IF(a,b) if (a != CS_SUCCEED) \
	{fprintf(stdout,"error in %s\n",b); return a;}

#define EXIT_IF(a) if (a != CS_SUCCEED)\
	{fprintf(stdout,"FATAL error on line %d \n",__LINE__); exit(-1) ;}

#define MAX_COLUMN 	10 
#define MAX_COLSIZE 	255
#define MAX_COMMAND	255

/* Global definitions */

char			rowbuffer[MAX_COLUMN][MAX_COLSIZE] ;
char			commandbuff[MAX_COMMAND] ;

CS_RETCODE		init_db()        ;
CS_RETCODE		connect_db ()     ;
CS_RETCODE 		cleanup_db ()     ;
CS_RETCODE		handle_returns () ;
CS_RETCODE 		bind_columns ()   ;
CS_RETCODE		fetch_n_print ()  ;
CS_RETCODE		open_cursor ()  ;
extern CS_RETCODE    	ctlib_client_msg_handler();
extern CS_RETCODE    	ctlib_server_msg_handler();

main()
{
	CS_CONTEXT	*cntx_ptr ;
	CS_CONNECTION	*conn_ptr ;
	CS_COMMAND	*cmd_ptr ;
	CS_RETCODE	ret ;
	CS_INT		command_type ;


	ret = init_db(&cntx_ptr);
	  EXIT_IF(ret);

	ret = connect_db (cntx_ptr, &conn_ptr, "sa", "");
	
	ret = ct_cmd_alloc (conn_ptr, &cmd_ptr );
	
	ret = open_cursor ( cmd_ptr);

	ret = ct_close ( conn_ptr, CS_UNUSED ) ;	

	ret = cleanup_db (cntx_ptr, ret );
 		EXIT_IF ( ret );

	printf("\n Exiting program -s'long ! \n");
	exit(0);
}

CS_RETCODE 	init_db (cntx_ptr)
CS_CONTEXT	**cntx_ptr ;
{
	CS_RETCODE	retcode ;

	retcode = cs_ctx_alloc (CS_VERSION_100,cntx_ptr );
		RETURN_IF ( retcode, "cs_ctx_alloc ");

	retcode = ct_init (*cntx_ptr, CS_VERSION_100 );
		RETURN_IF ( retcode, "ct_init ");

	retcode = ct_callback ( *cntx_ptr, NULL, CS_SET, CS_SERVERMSG_CB,
				(CS_VOID *)ctlib_server_msg_handler) ;
		RETURN_IF ( retcode, "ct_callback ");

	retcode = ct_callback (*cntx_ptr, NULL, CS_SET, CS_CLIENTMSG_CB,
				(CS_VOID *)ctlib_client_msg_handler);
		RETURN_IF ( retcode, "ct_callback: CLIENTMSG ");

	return retcode ;
}

CS_RETCODE 	cleanup_db ( cntx_ptr, status )
CS_CONTEXT	*cntx_ptr ;
CS_RETCODE	status ;
{
	CS_RETCODE	retcode ;
	CS_INT		exit_type ;

	exit_type = ( status != CS_SUCCEED ) ? CS_FORCE_EXIT : CS_UNUSED ;

	retcode = ct_exit (cntx_ptr, exit_type );
		RETURN_IF ( retcode, "db_cleanup:ct_exit ");

	retcode = cs_ctx_drop (cntx_ptr) ;
		RETURN_IF ( retcode, "db_cleanup:cs_drop ");

	return retcode ; 
}	

CS_RETCODE	connect_db (cntx_ptr, conn_ptr, user_name, password )
CS_CONTEXT	*cntx_ptr ;
CS_CONNECTION	**conn_ptr ;
CS_CHAR		*user_name, *password ;
{
	CS_RETCODE	retcode ;

	retcode = ct_con_alloc (cntx_ptr, conn_ptr );
		RETURN_IF ( retcode, "connect_db: ct_con_alloc ");

	retcode = ct_con_props ( *conn_ptr, CS_SET, CS_USERNAME, user_name,
					CS_NULLTERM, NULL );
		RETURN_IF ( retcode, "connect_db: ct_con_props: username ");

	retcode = ct_con_props ( *conn_ptr, CS_SET, CS_PASSWORD, password,
					CS_NULLTERM, NULL );
		RETURN_IF ( retcode, "connect_db: ct_con_props: password"); 

	retcode = ct_connect ( *conn_ptr, NULL, 0 ) ;
		RETURN_IF ( retcode, "connect_db: ct_connect ") ;

	return  CS_SUCCEED ;
}


CS_RETCODE	handle_returns ( cmd_ptr )
CS_COMMAND	*cmd_ptr ;
{
	CS_RETCODE	results_ok ;
	CS_INT		result_type ;

	while (( results_ok = ct_results ( cmd_ptr, &result_type)) == CS_SUCCEED )
	{
		switch ((int)result_type)
		{
			case CS_ROW_RESULT:
			  printf("TYPE: ROW RESULT \n");
			  results_ok = bind_columns ( cmd_ptr );
				RETURN_IF ( results_ok, "bind columns");
			  results_ok = fetch_n_print (cmd_ptr);
			  RETURN_IF(results_ok,"fetch n print");
			  break ;

			case CS_CMD_SUCCEED:	
					  printf("TYPE: CMD SUCCEEDED \n");
					  break ;

			case CS_CMD_DONE   :
					  printf("TYPE : CMD DONE \n");
				 	  break ;

			case CS_CMD_FAIL   :
					  printf("TYPE: CMD FAIL \n");
					  break ;

			case CS_PARAM_RESULT :
			  printf("TYPE: PARAM RESULT \n");
			  results_ok = bind_columns ( cmd_ptr );
				RETURN_IF ( results_ok, "bind columns");
		
			  results_ok = fetch_n_print ( cmd_ptr );
				RETURN_IF ( results_ok, "fetch_n_print");
					  break ;

			case CS_STATUS_RESULT :
					  printf("TYPE: STATUS RESULTS \n");
					  results_ok = bind_columns ( cmd_ptr );
						RETURN_IF ( results_ok, "bind columns");
		
					  results_ok = fetch_n_print ( cmd_ptr );
						RETURN_IF ( results_ok, "fetch_n_print");
					  break ;


			case CS_COMPUTE_RESULT :
					  printf("TYPE: COMPUTE RESULTS \n");
					  break ;

			case CS_CURSOR_RESULT :
				  printf("TYPE: CURSOR RESULT \n");
					  results_ok = bind_columns ( cmd_ptr );
						RETURN_IF ( results_ok, "bind columns");
					  results_ok =fetch_n_print(cmd_ptr);
						RETURN_IF ( results_ok, "single row columns");
					  break ;

			default    :
					  RETURN_IF ( CS_FAIL, "unknown results \n");
					  break ;
		} ;
	}
	if ( results_ok == CS_END_RESULTS )
	 	return CS_SUCCEED ;
	return CS_FAIL ;
}

CS_RETCODE 	bind_columns (cmd_ptr )
CS_COMMAND	*cmd_ptr ;
{
	CS_RETCODE	retcode ;
	CS_INT		i , num_cols ;
	CS_DATAFMT	target_format ;

	retcode = ct_res_info ( cmd_ptr, CS_NUMDATA, &num_cols, CS_UNUSED, NULL) ;
		RETURN_IF ( retcode, "ct_bind : ct_res_info ");

	for ( i = 1 ; i <= num_cols ; i++ )
	{
		memset ( &target_format, 0, CS_SIZEOF(target_format)) ;
		target_format.datatype = CS_CHAR_TYPE ;
		target_format.maxlength = MAX_COLSIZE  ;
		target_format.count    = 1 ;
		target_format.format   = CS_FMT_NULLTERM ;

		retcode = ct_bind ( cmd_ptr, i, &target_format, rowbuffer[i-1],
					NULL, NULL ) ;

		RETURN_IF ( retcode, "bind_columns: ct_bind ");
	}
	return CS_SUCCEED ;
}

CS_RETCODE	fetch_n_print ( cmd_ptr )
CS_COMMAND	*cmd_ptr ;
{
	CS_RETCODE 	retcode ;
	CS_INT		i, num_cols ;
	
	retcode = ct_res_info ( cmd_ptr, CS_NUMDATA, &num_cols, CS_UNUSED, NULL );
		RETURN_IF ( retcode, "fetch_n_print: ct_res_info ");

	while (( (retcode = ct_fetch(cmd_ptr, CS_UNUSED, CS_UNUSED, CS_UNUSED,
				(CS_INT *)NULL)) == CS_SUCCEED )	
	||
	      ( retcode == CS_ROW_FAIL ))
	{
		if ( retcode == CS_ROW_FAIL )
		{
			printf("ct_fetch returned row fail \n");
			continue ;
		}

		for ( i = 1 ; i <= num_cols ; i++ )
		{
			printf(" %s \t ", rowbuffer[i-1] );
		}
 		printf("\n");
	}

	if ( retcode != CS_END_DATA)
		RETURN_IF ( retcode, "fetch_n_print ") ;
	
	return CS_SUCCEED ;
}

CS_RETCODE open_cursor ( cmd_ptr , Commandbuff )
CS_COMMAND	*cmd_ptr ;
CS_CHAR		*Commandbuff ;
{
	CS_RETCODE	ret ;
	CS_DATAFMT	datafmt;
	CS_CHAR		input_type[5];

	ret = ct_cursor ( cmd_ptr, CS_CURSOR_DECLARE, "browse_cursor",
			CS_NULLTERM, "tempdb..testproc ",
				CS_NULLTERM, CS_FOR_UPDATE );
		RETURN_IF ( ret, "ct_cursor: declare ");

	fflush(stdin);
	printf("Enter object type: ");
	gets(input_type);

	ret = ct_cursor ( cmd_ptr, CS_CURSOR_OPEN, NULL, CS_UNUSED, NULL,
              CS_UNUSED, CS_UNUSED );
      RETURN_IF ( ret, "ct_cursor: open "); ;

      memset(&datafmt, 0, sizeof (datafmt));
      strcpy(datafmt.name, "@type");
      datafmt.namelen = CS_NULLTERM;
      datafmt.datatype = CS_CHAR_TYPE;
      datafmt.format = CS_FMT_NULLTERM;
      datafmt.maxlength = 255;
      datafmt.status = CS_INPUTVALUE;
      datafmt.locale = NULL;

      ret = ct_param(cmd_ptr, &datafmt, (CS_VOID *)input_type,
               strlen(input_type), CS_UNUSED) ;
              RETURN_IF( ret, "ct_param select");

      ret = ct_send ( cmd_ptr );
		RETURN_IF ( ret, "ct_send : cursor ");

      ret = handle_returns ( cmd_ptr );
		RETURN_IF ( ret, "ct_results : cursor ");

	return CS_SUCCEED ;
}