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Dokumen ini menggunakan Manual laman web PHP Cina Lepaskan
(PECL maxdb >= 1.0)
maxdb_field_count -- maxdb::field_count — Returns the number of columns for the most recent query
过程化风格
$link
)面向对象风格
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 maxdb_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.
An integer representing the number of fields in a result set.
Example #1 面向对象风格
<?php
$maxdb = new maxdb ( "localhost" , "MONA" , "RED" , "DEMODB" );
maxdb_report ( MAXDB_REPORT_OFF );
$maxdb -> query ( "DROP TABLE friends" );
maxdb_report ( MAXDB_REPORT_ERROR );
$maxdb -> query ( "CREATE TABLE friends (id int, name varchar(20))" );
$maxdb -> query ( "INSERT INTO friends VALUES (1,'Hartmut')" );
$maxdb -> query ( "INSERT INTO friends VALUES (2, 'Ulf')" );
if ( $maxdb -> field_count ()) {
$result = $maxdb -> store_result ();
$row = $result -> fetch_row ();
$result -> close ();
}
$maxdb -> close ();
?>
Example #2 过程化风格
<?php
$link = maxdb_connect ( "localhost" , "MONA" , "RED" , "DEMODB" );
maxdb_report ( MAXDB_REPORT_OFF );
maxdb_query ( $link , "DROP TABLE friends" );
maxdb_report ( MAXDB_REPORT_ERROR );
maxdb_query ( $link , "CREATE TABLE friends (id int, name varchar(20))" );
maxdb_query ( $link , "INSERT INTO friends VALUES (1,'Hartmut')" );
maxdb_query ( $link , "INSERT INTO friends VALUES (2, 'Ulf')" );
if ( maxdb_field_count ( $link )) {
$result = maxdb_store_result ( $link );
$row = maxdb_fetch_row ( $result );
maxdb_free_result ( $result );
}
maxdb_close ( $link );
?>
The above example produces no output.