db2_num_fields

(PECL ibm_db2 >= 1.0.0)

db2_num_fields — Returns the number of fields contained in a result set

설명

int db2_num_fields ( resource $stmt )

Returns 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.

인수

stmt: A valid statement resource containing a result set.

반환값

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.

예제

Example #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.";
?>

위 예제의 출력:

There are 4 columns in the result set.

참고

db2_execute() - Executes a prepared SQL statement
db2_field_display_size() - Returns the maximum number of bytes required to display a column
db2_field_name() - Returns the name of the column in the result set
db2_field_num() - Returns the position of the named column in a result set
db2_field_precision() - Returns the precision of the indicated column in a result set
db2_field_scale() - Returns the scale of the indicated column in a result set
db2_field_type() - Returns the data type of the indicated column in a result set
db2_field_width() - Returns the width of the current value of the indicated column in a result set