maxdb_field_count

Returns the number of columns for the most recent query (PECL)
int maxdb_field_count ( resource link )

Procedural style:

Object oriented style (method):

maxdb {
  int field_count();
}

Returns the number of columns for the most recent query on the connection represented by the link parameter. This function can be useful when using the maxdb_store_result() function to determine if the query should have produced a non-empty result set or not without knowing the nature of the query.

Return values

An integer representing the number of fields in a result set

Example

例 1004. Object oriented style

<?php
$maxdb
= new maxdb("localhost", "MONA", "RED", "DEMODB");

maxdb_report (MAXDB_REPORT_OFF);
$maxdb->query("DROP TABLE friends");
maxdb_report (MAXDB_REPORT_ERROR);

$maxdb->query( "CREATE TABLE friends (id int, name varchar(20))");

$maxdb->query( "INSERT INTO friends VALUES (1,'Hartmut')");
$maxdb->query( "INSERT INTO friends VALUES (2, 'Ulf')");

if (
$maxdb->field_count()) {
 
/* this was a select/show or describe query */
 
$result = $maxdb->store_result();
 
 
/* process resultset */
 
$row = $result->fetch_row();

 
/* free resultset */
 
$result->close();
}

/* close connection */
$maxdb->close();
?>

例 1005. Procedural style

<?php
$link
= maxdb_connect("localhost", "MONA", "RED", "DEMODB");

maxdb_report (MAXDB_REPORT_OFF);
maxdb_query($link,"DROP TABLE friends");
maxdb_report (MAXDB_REPORT_ERROR);

maxdb_query($link, "CREATE TABLE friends (id int, name varchar(20))");

maxdb_query($link, "INSERT INTO friends VALUES (1,'Hartmut')");
maxdb_query($link, "INSERT INTO friends VALUES (2, 'Ulf')");

if (
maxdb_field_count($link)) {
 
/* this was a select/show or describe query */
 
$result = maxdb_store_result($link);
 
 
/* process resultset */
 
$row = maxdb_fetch_row($result);

 
/* free resultset */
 
maxdb_free_result($result);
}

/* close connection */
maxdb_close($link);
?>

The above example produces no output.