mysqli_field_count
(PHP 5)
mysqli_field_count
(no version information, might be only in CVS)
mysqli->field_count -- Returns the number of columns for the most recent query
Description
Procedural style:
int
mysqli_field_count ( mysqli link )
Object oriented style (method):
class
mysqli {
int
field_count ( void )
}
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.
返回值
An integer representing the number of fields in a result set
例
例子 1. 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')");
$mysqli->real_query($HTTP_POST_VARS['query']);
if (mysqli_field_count($link)) { /* 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(); ?>
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例子 2. Procedural style
<?php $link = mysqli_connect("localhost", "my_user", "my_password", "test");
mysqli_query($link, "DROP TABLE IF EXISTS friends"); mysqli_query($link, "CREATE TABLE friends (id int, name varchar(20))"); mysqli_query($link, "INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");
mysqli_real_query($link, $HTTP_POST_VARS['query']);
if (mysqli_field_count($link)) { /* this was a select/show or describe query */ $result = mysqli_store_result($link); /* process resultset */ $row = mysqli_fetch_row($result);
/* free resultset */ mysqli_free_result($result); }
/* close connection */ mysqli_close($link); ?>
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