PHP Manual
Informix 函数
Returns the number of columns in the query

ifx_num_fields

(PHP 4, PHP 5 < 5.2.1)

ifx_num_fields — Returns the number of columns in the query

说明

ifx_num_fields ( resource $result_id ) : int

After preparing or executing a query, this call gives you the number of columns in the query.

参数

result_id: result_id is a valid resultid returned by ifx_query() or ifx_prepare() (select type queries only!).

返回值

Returns the number of columns in query for result_id, or FALSE on errors.

范例

Example #1 ifx_num_fields() Example

 <?php
$conn_id = ifx_connect("db", "user", "password");
$res_id = ifx_query("select * from systables", $conn_id);
echo ifx_num_fields($res_id);
?>

参见

ifx_num_rows() - Count the rows already fetched from a query

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