01-28-2008
[amit@venus]$ cat temp.c
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#define MYVAR
MYVAR int main(void){
printf("success\n");
exit(EXIT_SUCCESS);
}
[amit@venus]$ gcc -o temp -S temp.c
[amit@venus]$ cat temp_wo_macro.c
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#define MYVAR
int main(void){ <===
printf("success\n");
exit(EXIT_SUCCESS);
}
[amit@venus]$ gcc -o temp_wo_macro -S temp_wo_macro.c
[amit@venus]$ diff temp temp_wo_macro
1c1
< .file "temp.c"
---
> .file "temp_wo_macro.c"
I really don't know, that why i didn't tried this small exercise before,
anyways as Bill pointed,it seems that it is perfectly legal to have a #defined variable left blank,
though if you try to access the same variable you need to assign it first.
here the code just gets expanded as "int main(void)"
They might have added this MACRO(NORET_TYPE) just to make sure that
nobody replaces ' void ' with anything else.
~amit
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LEARN ABOUT PHP
maxdb_stmt_errno
MAXDB_STMT_ERRNO(3) 1 MAXDB_STMT_ERRNO(3)
maxdb_stmt_errno - Returns the error code for the most recent statement call
Procedural style
SYNOPSIS
int maxdb_stmt_errno (resource $stmt)
DESCRIPTION
Object oriented style
int$maxdb_stmt->errno ()
For the statement specified by stmt, maxdb_stmt_errno(3) returns the error code for the most recently invoked statement function that can
succeed or fail.
Note
For possible error codes see documentation of SQLDBC: http://maxdb.sap.com/documentation/.
RETURN VALUES
An error code value. Zero means no error occurred.
EXAMPLES
Example #1
Object oriented style
<?php
/* Open a connection */
$maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB");
/* check connection */
if (maxdb_connect_errno()) {
printf("Connect failed: %s
", maxdb_connect_error());
exit();
}
$maxdb->query("CREATE TABLE temp.mycity LIKE hotel.city");
$maxdb->query("INSERT INTO temp.mycity SELECT * FROM hotel.city");
$query = "SELECT name, zip FROM temp.mycity ORDER BY name";
if ($stmt = $maxdb->prepare($query)) {
/* drop table */
$maxdb->query("DROP TABLE temp.mycity");
/* execute query */
$stmt->execute();
printf("Error: %d.
", $stmt->errno);
/* close statement */
$stmt->close();
}
/* close connection */
$maxdb->close();
?>
Example #2
Procedural style
<?php
/* Open a connection */
$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");
/* check connection */
if (maxdb_connect_errno()) {
printf("Connect failed: %s
", maxdb_connect_error());
exit();
}
maxdb_query($link, "CREATE TABLE temp.mycity LIKE hotel.city");
maxdb_query($link, "INSERT INTO temp.mycity SELECT * FROM hotel.city");
$query = "SELECT name, zip FROM temp.mycity ORDER BY name";
if ($stmt = maxdb_prepare($link, $query)) {
/* drop table */
maxdb_query($link, "DROP TABLE temp.mycity");
/* execute query */
maxdb_stmt_execute($stmt);
printf("Error: %d.
", maxdb_stmt_errno($stmt));
/* close statement */
maxdb_stmt_close($stmt);
}
/* close connection */
maxdb_close($link);
?>
The above example will output something similar to:
Warning: maxdb_stmt_execute(): -4004 POS(23) Unknown table name:MYCITY [42000] <...>
Error: -4004.
SEE ALSO
maxdb_stmt_error(3), maxdb_stmt_sqlstate(3).
PHP Documentation Group MAXDB_STMT_ERRNO(3)