Oracle 5.0, Справочное руководство

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MySQL Improved Extension (
Mysqli
)
2372
Description
Object oriented style
int
mysqli->field_count ;
Procedural style
int mysqli_field_count(
mysqli link);
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
mysqli_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.
Parameters
link
Procedural style only: A link identifier returned by
mysqli_connect
or
mysqli_init
Return Values
An integer representing the number of fields in a result set.
Examples
Example 20.120.
$mysqli->field_count
example
Object oriented style
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");
$mysqli->query( "DROP TABLE IF EXISTS friends");
$mysqli->query( "CREATE TABLE friends (id int, name varchar(20))");
$mysqli->query( "INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");
$mysqli->real_query("SELECT * FROM friends");
if ($mysqli->field_count) {
/* this was a select/show or describe query */
$result = $mysqli->store_result();
/* process resultset */
$row = $result->fetch_row();
/* free resultset */
$result->close();
}
/* close connection */
$mysqli->close();
?>
Procedural style
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "test");