maxdb_field_count

Description

Procedural style:

Object oriented style (method):

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

例子 1. 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(); ?>

例子 2. 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.