(PECL ibm_db2 >= 1.0.0)
db2_num_fields — Returns the number of fields contained in a result set
$stmt): int|falseReturns the number of fields contained in a result set. This is most useful for handling the result sets returned by dynamically generated queries, or for result sets returned by stored procedures, where your application cannot otherwise know how to retrieve and use the results.
stmtA valid statement resource containing a result set.
Returns an integer value representing the number of fields in the result
set associated with the specified statement resource. Returns false if
the statement resource is not a valid input value.
示例 #1 Retrieving the number of fields in a result set
The following example demonstrates how to retrieve the number of fields returned in a result set.
<?php
$sql = "SELECT id, name, breed, weight FROM animals ORDER BY breed";
$stmt = db2_prepare($conn, $sql);
db2_execute($stmt, $sql);
$columns = db2_num_fields($stmt);
echo "There are {$columns} columns in the result set.";
?>
以上例程会输出：
There are 4 columns in the result set.